| blob | e3cc3a8e867d3428d34f2b4db9c47104a0385450 |
1 dnl
2 dnl GLIBCXX_CONDITIONAL (NAME, SHELL-TEST)
3 dnl
4 dnl Exactly like AM_CONDITIONAL, but delays evaluation of the test until the
5 dnl end of configure. This lets tested variables be reassigned, and the
6 dnl conditional will depend on the final state of the variable. For a simple
7 dnl example of why this is needed, see GLIBCXX_ENABLE_HOSTED.
8 dnl
9 m4_define([_m4_divert(glibcxx_diversion)], 8000)dnl
10 AC_DEFUN([GLIBCXX_CONDITIONAL], [dnl
11 m4_divert_text([glibcxx_diversion],dnl
12 AM_CONDITIONAL([$1],[$2])
13 )dnl
14 ])dnl
15 AC_DEFUN([GLIBCXX_EVALUATE_CONDITIONALS], [m4_undivert([glibcxx_diversion])])dnl
18 dnl
19 dnl Check to see what architecture and operating system we are compiling
20 dnl for. Also, if architecture- or OS-specific flags are required for
21 dnl compilation, pick them up here.
22 dnl
23 AC_DEFUN([GLIBCXX_CHECK_HOST], [
24 . $glibcxx_srcdir/configure.host
25 AC_MSG_NOTICE([CPU config directory is $cpu_include_dir])
26 AC_MSG_NOTICE([OS config directory is $os_include_dir])
27 ])
29 dnl
30 dnl Initialize the rest of the library configury. At this point we have
31 dnl variables like $host.
32 dnl
33 dnl Sets:
34 dnl SUBDIRS
35 dnl Substs:
36 dnl glibcxx_builddir (absolute path)
37 dnl glibcxx_srcdir (absolute path)
38 dnl toplevel_builddir (absolute path)
39 dnl toplevel_srcdir (absolute path)
40 dnl with_cross_host
41 dnl with_newlib
42 dnl with_target_subdir
43 dnl plus
44 dnl - the variables in GLIBCXX_CHECK_HOST / configure.host
45 dnl - default settings for all AM_CONFITIONAL test variables
46 dnl - lots of tools, like CC and CXX
47 dnl
48 AC_DEFUN([GLIBCXX_CONFIGURE], [
49 # Keep these sync'd with the list in Makefile.am. The first provides an
50 # expandable list at autoconf time; the second provides an expandable list
51 # (i.e., shell variable) at configure time.
52 m4_define([glibcxx_SUBDIRS],[include libsupc++ src src/c++98 src/c++11 src/c++17 src/c++20 src/filesystem src/libbacktrace doc po testsuite python])
53 SUBDIRS='glibcxx_SUBDIRS'
55 # These need to be absolute paths, yet at the same time need to
56 # canonicalize only relative paths, because then amd will not unmount
57 # drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
58 glibcxx_builddir=`${PWDCMD-pwd}`
59 case $srcdir in
60 [\\/$]* | ?:[\\/]*) glibcxx_srcdir=${srcdir} ;;
61 *) glibcxx_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} || echo "$srcdir"` ;;
62 esac
63 toplevel_builddir=${glibcxx_builddir}/..
64 toplevel_srcdir=${glibcxx_srcdir}/..
65 AC_SUBST(glibcxx_builddir)
66 AC_SUBST(glibcxx_srcdir)
67 AC_SUBST(toplevel_builddir)
68 AC_SUBST(toplevel_srcdir)
70 # We use these options to decide which functions to include. They are
71 # set from the top level.
72 AC_ARG_WITH([target-subdir],
73 AC_HELP_STRING([--with-target-subdir=SUBDIR],
74 [configuring in a subdirectory]))
76 AC_ARG_WITH([cross-host],
77 AC_HELP_STRING([--with-cross-host=HOST],
78 [configuring with a cross compiler]))
80 AC_ARG_WITH([newlib],
81 AC_HELP_STRING([--with-newlib],
82 [assume newlib as a system C library]))
84 # Will set LN_S to either 'ln -s', 'ln', or 'cp -p' (if linking isn't
85 # available). Uncomment the next line to force a particular method.
86 AC_PROG_LN_S
87 #LN_S='cp -p'
89 AC_CHECK_TOOL(AS, as)
90 AC_CHECK_TOOL(AR, ar)
91 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
93 AM_MAINTAINER_MODE
95 # Set up safe default values for all subsequent AM_CONDITIONAL tests
96 # which are themselves conditionally expanded.
97 ## (Right now, this only matters for enable_wchar_t, but nothing prevents
98 ## other macros from doing the same. This should be automated.) -pme
100 # Check for C library flavor since GNU/Linux platforms use different
101 # configuration directories depending on the C library in use.
102 AC_EGREP_CPP([_using_uclibc], [
103 #include <stdio.h>
104 #if __UCLIBC__
105 _using_uclibc
106 #endif
107 ], uclibc=yes, uclibc=no)
109 AC_EGREP_CPP([_using_bionic], [
110 #include <stdio.h>
111 #if __BIONIC__
112 _using_bionic
113 #endif
114 ], bionic=yes, bionic=no)
116 # Find platform-specific directories containing configuration info.
117 # Also possibly modify flags used elsewhere, as needed by the platform.
118 GLIBCXX_CHECK_HOST
119 ])
122 dnl
123 dnl Tests for newer compiler features, or features that are present in newer
124 dnl compiler versions but not older compiler versions still in use, should
125 dnl be placed here.
126 dnl
127 dnl Defines:
128 dnl WERROR='-Werror' if requested and possible; g++'s that lack the
129 dnl new inlining code or the new system_header pragma will die on -Werror.
130 dnl Leave it out by default and use maint-mode to use it.
131 dnl SECTION_FLAGS='-ffunction-sections -fdata-sections' if
132 dnl compiler supports it and the user has not requested debug mode.
133 dnl
134 AC_DEFUN([GLIBCXX_CHECK_COMPILER_FEATURES], [
135 # All these tests are for C++; save the language and the compiler flags.
136 # The CXXFLAGS thing is suspicious, but based on similar bits previously
137 # found in GLIBCXX_CONFIGURE.
138 AC_LANG_SAVE
139 AC_LANG_CPLUSPLUS
140 ac_test_CXXFLAGS="${CXXFLAGS+set}"
141 ac_save_CXXFLAGS="$CXXFLAGS"
143 # Check for -ffunction-sections -fdata-sections
144 AC_MSG_CHECKING([for g++ that supports -ffunction-sections -fdata-sections])
145 CXXFLAGS='-g -Werror -ffunction-sections -fdata-sections'
146 AC_TRY_COMPILE([int foo; void bar() { };],, [ac_fdsections=yes], [ac_fdsections=no])
147 if test "$ac_test_CXXFLAGS" = set; then
148 CXXFLAGS="$ac_save_CXXFLAGS"
149 else
150 # this is the suspicious part
151 CXXFLAGS=''
152 fi
153 if test x"$ac_fdsections" = x"yes"; then
154 SECTION_FLAGS='-ffunction-sections -fdata-sections'
155 fi
156 AC_MSG_RESULT($ac_fdsections)
158 AC_LANG_RESTORE
159 AC_SUBST(SECTION_FLAGS)
160 ])
163 dnl
164 dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
165 dnl the native linker is in use, all variables will be defined to something
166 dnl safe (like an empty string).
167 dnl
168 dnl Defines:
169 dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
170 dnl OPT_LDFLAGS='-Wl,-O1' and '-z,relro' if possible
171 dnl LD (as a side effect of testing)
172 dnl Sets:
173 dnl with_gnu_ld
174 dnl glibcxx_ld_is_gold (set to "no" or "yes")
175 dnl glibcxx_ld_is_mold (set to "no" or "yes")
176 dnl glibcxx_gnu_ld_version (possibly)
177 dnl
178 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
179 dnl set glibcxx_gnu_ld_version to 12345. Zeros cause problems.
180 dnl
181 AC_DEFUN([GLIBCXX_CHECK_LINKER_FEATURES], [
182 # If we're not using GNU ld, then there's no point in even trying these
183 # tests. Check for that first. We should have already tested for gld
184 # by now (in libtool), but require it now just to be safe...
185 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
186 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
187 AC_REQUIRE([AC_PROG_LD])
188 AC_REQUIRE([AC_PROG_AWK])
190 # The name set by libtool depends on the version of libtool. Shame on us
191 # for depending on an impl detail, but c'est la vie. Older versions used
192 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
193 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
194 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
195 # set (hence we're using an older libtool), then set it.
196 if test x${with_gnu_ld+set} != xset; then
197 if test x${ac_cv_prog_gnu_ld+set} != xset; then
198 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
199 with_gnu_ld=no
200 else
201 with_gnu_ld=$ac_cv_prog_gnu_ld
202 fi
203 fi
205 # Start by getting the version number. I think the libtool test already
206 # does some of this, but throws away the result.
207 glibcxx_ld_is_gold=no
208 glibcxx_ld_is_mold=no
209 if test x"$with_gnu_ld" = x"yes"; then
210 AC_MSG_CHECKING([for ld version])
211 changequote(,)
212 if $LD --version 2>/dev/null | grep 'GNU gold' >/dev/null 2>&1; then
213 glibcxx_ld_is_gold=yes
214 elif $LD --version 2>/dev/null | grep 'mold' >/dev/null 2>&1; then
215 glibcxx_ld_is_mold=yes
216 fi
217 ldver=`$LD --version 2>/dev/null |
218 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
219 changequote([,])
220 glibcxx_gnu_ld_version=`echo $ldver | \
221 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
222 AC_MSG_RESULT($glibcxx_gnu_ld_version)
223 fi
225 # Set --gc-sections.
226 glibcxx_have_gc_sections=no
227 if test "$glibcxx_ld_is_gold" = "yes" || test "$glibcxx_ld_is_mold" = "yes" ; then
228 if $LD --help 2>/dev/null | grep gc-sections >/dev/null 2>&1; then
229 glibcxx_have_gc_sections=yes
230 fi
231 else
232 glibcxx_gcsections_min_ld=21602
233 if test x"$with_gnu_ld" = x"yes" &&
234 test $glibcxx_gnu_ld_version -gt $glibcxx_gcsections_min_ld ; then
235 glibcxx_have_gc_sections=yes
236 fi
237 fi
238 if test "$glibcxx_have_gc_sections" = "yes"; then
239 # Sufficiently young GNU ld it is! Joy and bunny rabbits!
240 # NB: This flag only works reliably after 2.16.1. Configure tests
241 # for this are difficult, so hard wire a value that should work.
243 ac_test_CFLAGS="${CFLAGS+set}"
244 ac_save_CFLAGS="$CFLAGS"
245 CFLAGS='-Wl,--gc-sections'
247 # Check for -Wl,--gc-sections
248 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
249 AC_TRY_LINK([ int one(void) { return 1; }
250 int two(void) { return 2; }
251 ], [ two(); ] , [ac_gcsections=yes], [ac_gcsections=no])
252 if test "$ac_gcsections" = "yes"; then
253 rm -f conftest.c
254 touch conftest.c
255 if $CC -c conftest.c; then
256 if $LD --gc-sections -o conftest conftest.o 2>&1 | \
257 grep "Warning: gc-sections option ignored" > /dev/null; then
258 ac_gcsections=no
259 fi
260 fi
261 rm -f conftest.c conftest.o conftest
262 fi
263 if test "$ac_gcsections" = "yes"; then
264 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
265 fi
266 AC_MSG_RESULT($ac_gcsections)
268 if test "$ac_test_CFLAGS" = set; then
269 CFLAGS="$ac_save_CFLAGS"
270 else
271 # this is the suspicious part
272 CFLAGS=''
273 fi
274 fi
276 # Set -z,relro.
277 # Note this is only for shared objects.
278 ac_ld_relro=no
279 if test x"$with_gnu_ld" = x"yes"; then
280 # cygwin and mingw uses PE, which has no ELF relro support,
281 # multi target ld may confuse configure machinery
282 case "$host" in
283 *-*-cygwin*)
284 ;;
285 *-*-mingw*)
286 ;;
287 *)
288 AC_MSG_CHECKING([for ld that supports -Wl,-z,relro])
289 cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
290 if test -n "$cxx_z_relo"; then
291 OPT_LDFLAGS="-Wl,-z,relro"
292 ac_ld_relro=yes
293 fi
294 AC_MSG_RESULT($ac_ld_relro)
295 esac
296 fi
298 # Set linker optimization flags.
299 if test x"$with_gnu_ld" = x"yes"; then
300 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
301 fi
303 AC_SUBST(SECTION_LDFLAGS)
304 AC_SUBST(OPT_LDFLAGS)
305 ])
308 dnl
309 dnl Check for headers for, and arguments to, the setrlimit() function.
310 dnl Used only in testsuite_hooks.h. Called from GLIBCXX_CONFIGURE_TESTSUITE.
311 dnl
312 dnl Defines:
313 dnl _GLIBCXX_RES_LIMITS if we can set artificial resource limits
314 dnl various HAVE_LIMIT_* for individual limit names
315 dnl
316 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT_ancilliary], [
317 AC_MSG_CHECKING([for RLIMIT_$1])
318 AC_TRY_COMPILE(
319 [#include <unistd.h>
320 #include <sys/time.h>
321 #include <sys/resource.h>
322 ],
323 [ int f = RLIMIT_$1 ; ],
324 [glibcxx_mresult=1], [glibcxx_mresult=0])
325 AC_DEFINE_UNQUOTED(HAVE_LIMIT_$1, $glibcxx_mresult,
326 [Only used in build directory testsuite_hooks.h.])
327 if test $glibcxx_mresult = 1 ; then res=yes ; else res=no ; fi
328 AC_MSG_RESULT($res)
329 ])
331 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT], [
332 AC_LANG_SAVE
333 AC_LANG_CPLUSPLUS
334 setrlimit_have_headers=yes
335 AC_CHECK_HEADERS(unistd.h sys/time.h sys/resource.h,
336 [],
337 [setrlimit_have_headers=no])
338 # If don't have the headers, then we can't run the tests now, and we
339 # won't be seeing any of these during testsuite compilation.
340 if test $setrlimit_have_headers = yes; then
341 # Can't do these in a loop, else the resulting syntax is wrong.
342 GLIBCXX_CHECK_SETRLIMIT_ancilliary(DATA)
343 GLIBCXX_CHECK_SETRLIMIT_ancilliary(RSS)
344 GLIBCXX_CHECK_SETRLIMIT_ancilliary(VMEM)
345 GLIBCXX_CHECK_SETRLIMIT_ancilliary(AS)
346 GLIBCXX_CHECK_SETRLIMIT_ancilliary(FSIZE)
348 # Check for rlimit, setrlimit.
349 AC_CACHE_CHECK([for testsuite resource limits support],
350 glibcxx_cv_setrlimit, [
351 AC_TRY_COMPILE(
352 [#include <unistd.h>
353 #include <sys/time.h>
354 #include <sys/resource.h>
355 ],
356 [struct rlimit r;
357 setrlimit(0, &r);],
358 [glibcxx_cv_setrlimit=yes], [glibcxx_cv_setrlimit=no])
359 ])
361 if test $glibcxx_cv_setrlimit = yes; then
362 AC_DEFINE(_GLIBCXX_RES_LIMITS, 1,
363 [Define if using setrlimit to set resource limits during
364 "make check"])
365 fi
366 fi
367 AC_LANG_RESTORE
368 ])
371 dnl
372 dnl Check whether S_ISREG (Posix) or S_IFREG is available in <sys/stat.h>.
373 dnl Define HAVE_S_ISREG / HAVE_S_IFREG appropriately.
374 dnl
375 AC_DEFUN([GLIBCXX_CHECK_S_ISREG_OR_S_IFREG], [
377 AC_LANG_SAVE
378 AC_LANG_CPLUSPLUS
379 ac_save_CXXFLAGS="$CXXFLAGS"
380 CXXFLAGS="$CXXFLAGS -fno-exceptions"
382 AC_MSG_CHECKING([for S_ISREG or S_IFREG])
383 AC_CACHE_VAL(glibcxx_cv_S_ISREG, [
384 GCC_TRY_COMPILE_OR_LINK(
385 [#include <sys/stat.h>],
386 [struct stat buffer;
387 fstat(0, &buffer);
388 S_ISREG(buffer.st_mode);],
389 [glibcxx_cv_S_ISREG=yes],
390 [glibcxx_cv_S_ISREG=no])
391 ])
392 AC_CACHE_VAL(glibcxx_cv_S_IFREG, [
393 GCC_TRY_COMPILE_OR_LINK(
394 [#include <sys/stat.h>],
395 [struct stat buffer;
396 fstat(0, &buffer);
397 S_IFREG & buffer.st_mode;],
398 [glibcxx_cv_S_IFREG=yes],
399 [glibcxx_cv_S_IFREG=no])
400 ])
401 res=no
402 if test $glibcxx_cv_S_ISREG = yes; then
403 AC_DEFINE(HAVE_S_ISREG, 1,
404 [Define if S_ISREG is available in <sys/stat.h>.])
405 res=S_ISREG
406 elif test $glibcxx_cv_S_IFREG = yes; then
407 AC_DEFINE(HAVE_S_IFREG, 1,
408 [Define if S_IFREG is available in <sys/stat.h>.])
409 res=S_IFREG
410 fi
411 AC_MSG_RESULT($res)
413 CXXFLAGS="$ac_save_CXXFLAGS"
414 AC_LANG_RESTORE
415 ])
418 dnl
419 dnl Check whether poll is available in <poll.h>, and define HAVE_POLL.
420 dnl
421 AC_DEFUN([GLIBCXX_CHECK_POLL], [
423 AC_LANG_SAVE
424 AC_LANG_CPLUSPLUS
425 ac_save_CXXFLAGS="$CXXFLAGS"
426 CXXFLAGS="$CXXFLAGS -fno-exceptions"
428 AC_CACHE_CHECK([for poll], glibcxx_cv_POLL, [
429 GCC_TRY_COMPILE_OR_LINK(
430 [#include <poll.h>],
431 [struct pollfd pfd[1];
432 pfd[0].events = POLLIN;
433 poll(pfd, 1, 0);],
434 [glibcxx_cv_POLL=yes],
435 [glibcxx_cv_POLL=no])
436 ])
437 if test $glibcxx_cv_POLL = yes; then
438 AC_DEFINE(HAVE_POLL, 1, [Define if poll is available in <poll.h>.])
439 fi
441 CXXFLAGS="$ac_save_CXXFLAGS"
442 AC_LANG_RESTORE
443 ])
446 dnl
447 dnl Check whether writev is available in <sys/uio.h>, and define HAVE_WRITEV.
448 dnl
449 AC_DEFUN([GLIBCXX_CHECK_WRITEV], [
451 AC_LANG_SAVE
452 AC_LANG_CPLUSPLUS
453 ac_save_CXXFLAGS="$CXXFLAGS"
454 CXXFLAGS="$CXXFLAGS -fno-exceptions"
456 AC_CACHE_CHECK([for writev], glibcxx_cv_WRITEV, [
457 GCC_TRY_COMPILE_OR_LINK(
458 [#include <sys/uio.h>],
459 [struct iovec iov[2];
460 writev(0, iov, 0);],
461 [glibcxx_cv_WRITEV=yes],
462 [glibcxx_cv_WRITEV=no])
463 ])
464 if test $glibcxx_cv_WRITEV = yes; then
465 AC_DEFINE(HAVE_WRITEV, 1, [Define if writev is available in <sys/uio.h>.])
466 fi
468 CXXFLAGS="$ac_save_CXXFLAGS"
469 AC_LANG_RESTORE
470 ])
473 dnl
474 dnl Check whether LFS support is available.
475 dnl
476 AC_DEFUN([GLIBCXX_CHECK_LFS], [
477 AC_LANG_SAVE
478 AC_LANG_CPLUSPLUS
479 ac_save_CXXFLAGS="$CXXFLAGS"
480 CXXFLAGS="$CXXFLAGS -fno-exceptions"
481 AC_CACHE_CHECK([for LFS support], glibcxx_cv_LFS, [
482 GCC_TRY_COMPILE_OR_LINK(
483 [#include <unistd.h>
484 #include <stdio.h>
485 #include <sys/stat.h>
486 ],
487 [FILE* fp;
488 fopen64("t", "w");
489 fseeko64(fp, 0, SEEK_CUR);
490 ftello64(fp);
491 lseek64(1, 0, SEEK_CUR);
492 struct stat64 buf;
493 fstat64(1, &buf);],
494 [glibcxx_cv_LFS=yes],
495 [glibcxx_cv_LFS=no])
496 ])
497 if test $glibcxx_cv_LFS = yes; then
498 AC_DEFINE(_GLIBCXX_USE_LFS, 1, [Define if LFS support is available.])
499 fi
500 CXXFLAGS="$ac_save_CXXFLAGS"
501 AC_LANG_RESTORE
502 ])
505 dnl
506 dnl Check whether the old Copy-On-Write basic_string should allocate a new
507 dnl empty representation for every default-constructed basic_string. Without
508 dnl this option, COW strings share a single empty rep in static storage,
509 dnl but this only works if the linker can guarantee the static storage has
510 dnl a unique definition in the process. It also doesn't work if basic_string
511 dnl objects are stored in shared memory (see PR libstdc++/16612).
512 dnl When fully dynamic strings are enabled, the static storage is not used
513 dnl and a new empty string with reference-count == 1 is allocated each time.
514 dnl Enabling this changes the libstdc++.so ABI.
515 dnl
516 dnl --enable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 1
517 dnl --disable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 0
518 dnl otherwise the macro is not defined.
519 dnl + Usage: GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING[(DEFAULT)]
520 dnl Where DEFAULT is either `yes' or `no'.
521 dnl
522 AC_DEFUN([GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING], [
523 GLIBCXX_ENABLE(fully-dynamic-string,$1,,[do not put empty strings in per-process static memory], [permit yes|no])
524 if test $enable_fully_dynamic_string = yes; then
525 enable_fully_dynamic_string_def=1
526 else
527 enable_fully_dynamic_string_def=0
528 fi
529 AC_DEFINE_UNQUOTED([_GLIBCXX_FULLY_DYNAMIC_STRING], [${enable_fully_dynamic_string_def}],
530 [Define to 1 if a fully dynamic basic_string is wanted, 0 to disable, undefined for platform defaults])
531 ])
534 dnl
535 dnl Does any necessary configuration of the testsuite directory. Generates
536 dnl the testsuite_hooks.h header.
537 dnl
538 dnl GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE must be done before this.
539 dnl
540 dnl Sets:
541 dnl enable_abi_check
542 dnl GLIBCXX_TEST_WCHAR_T
543 dnl GLIBCXX_TEST_THREAD
544 dnl Substs:
545 dnl baseline_dir
546 dnl baseline_subdir_switch
547 dnl
548 AC_DEFUN([GLIBCXX_CONFIGURE_TESTSUITE], [
549 # Do checks for resource limit functions.
550 GLIBCXX_CHECK_SETRLIMIT
552 if $GLIBCXX_IS_NATIVE ; then
553 # Look for setenv, so that extended locale tests can be performed.
554 GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_3(setenv)
555 fi
557 if $GLIBCXX_IS_NATIVE && test $is_hosted = yes &&
558 test $enable_symvers != no; then
559 case "$host" in
560 *-*-cygwin*)
561 enable_abi_check=no ;;
562 *)
563 enable_abi_check=yes ;;
564 esac
565 else
566 # Only build this as native, since automake does not understand
567 # CXX_FOR_BUILD.
568 enable_abi_check=no
569 fi
571 # Export file names for ABI checking.
572 baseline_dir="$glibcxx_srcdir/config/abi/post/${abi_baseline_pair}"
573 AC_SUBST(baseline_dir)
574 baseline_subdir_switch="$abi_baseline_subdir_switch"
575 AC_SUBST(baseline_subdir_switch)
576 ])
579 dnl
580 dnl Does any necessary configuration for docbook in the docs directory.
581 dnl
582 dnl XSLTPROC must be set before this
583 dnl
584 dnl Sets:
585 dnl glibcxx_stylesheets
586 dnl Substs:
587 dnl XSL_STYLE_DIR
588 dnl
589 AC_DEFUN([GLIBCXX_CONFIGURE_DOCBOOK], [
591 glibcxx_docbook_url=http://docbook.sourceforge.net/release/xsl-ns/current/
593 AC_MSG_CHECKING([for local stylesheet directory])
594 glibcxx_local_stylesheets=no
595 if test x${XMLCATALOG} = xyes && xsl_style_dir=`xmlcatalog "" $glibcxx_docbook_url 2>/dev/null`
596 then
597 XSL_STYLE_DIR=`echo $xsl_style_dir | sed -n 's;^file://;;p'`
598 glibcxx_local_stylesheets=yes
599 else
600 for dir in \
601 /usr/share/sgml/docbook/xsl-ns-stylesheets \
602 /usr/share/xml/docbook/stylesheet/docbook-xsl-ns \
603 /usr/share/xml/docbook/stylesheet/nwalsh5/current \
604 /usr/share/xml/docbook/stylesheet/nwalsh/current
605 do
606 if test -d $dir; then
607 glibcxx_local_stylesheets=yes
608 XSL_STYLE_DIR=$dir
609 break
610 fi
611 done
612 fi
613 AC_MSG_RESULT($glibcxx_local_stylesheets)
615 if test x"$glibcxx_local_stylesheets" = x"yes"; then
616 AC_SUBST(XSL_STYLE_DIR)
617 AC_MSG_NOTICE($XSL_STYLE_DIR)
619 AC_MSG_CHECKING([for docbook stylesheets for documentation creation])
620 glibcxx_stylesheets=no
621 if test x${XMLCATALOG} = xno || xmlcatalog "" $glibcxx_docbook_url/xhtml/docbook.xsl >/dev/null 2>&1; then
622 if test x${XSLTPROC} = xyes && echo '<title/>' | xsltproc --noout --nonet --xinclude $glibcxx_docbook_url/xhtml/docbook.xsl - 2>/dev/null; then
623 glibcxx_stylesheets=yes
624 fi
625 fi
626 AC_MSG_RESULT($glibcxx_stylesheets)
628 else
629 glibcxx_stylesheets=no
630 fi
632 # Check for epub3 dependencies.
633 AC_MSG_CHECKING([for epub3 stylesheets for documentation creation])
634 glibcxx_epub_stylesheets=no
635 if test x"$glibcxx_local_stylesheets" = x"yes"; then
636 if test -f "$XSL_STYLE_DIR/epub3/chunk.xsl"; then
637 glibcxx_epub_stylesheets=yes
638 fi
639 fi
640 AC_MSG_RESULT($glibcxx_epub_stylesheets)
641 AM_CONDITIONAL(BUILD_EPUB, test x"$glibcxx_epub_stylesheets" = x"yes")
643 ])
646 dnl
647 dnl Set up *_INCLUDES variables for all sundry Makefile.am's.
648 dnl
649 dnl Substs:
650 dnl GLIBCXX_INCLUDES
651 dnl TOPLEVEL_INCLUDES
652 dnl
653 AC_DEFUN([GLIBCXX_EXPORT_INCLUDES], [
654 # Used for every C++ compile we perform.
655 GLIBCXX_INCLUDES="\
656 -I$glibcxx_builddir/include/$host_alias \
657 -I$glibcxx_builddir/include \
658 -I$glibcxx_srcdir/libsupc++"
660 # For Canadian crosses, pick this up too.
661 if test $CANADIAN = yes; then
662 GLIBCXX_INCLUDES="$GLIBCXX_INCLUDES -I\${includedir}"
663 fi
665 # Stuff in the actual top level. Currently only used by libsupc++ to
666 # get unwind* headers from the libgcc dir.
667 #TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc -I$(toplevel_srcdir)/include'
668 TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc'
670 # Now, export this to all the little Makefiles....
671 AC_SUBST(GLIBCXX_INCLUDES)
672 AC_SUBST(TOPLEVEL_INCLUDES)
673 ])
676 dnl
677 dnl Set up *_FLAGS and *FLAGS variables for all sundry Makefile.am's.
678 dnl (SECTION_FLAGS is done under CHECK_COMPILER_FEATURES.)
679 dnl
680 dnl Substs:
681 dnl OPTIMIZE_CXXFLAGS
682 dnl WARN_FLAGS
683 dnl
684 AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
685 # Optimization flags that are probably a good idea for thrill-seekers. Just
686 # uncomment the lines below and make, everything else is ready to go...
687 # Alternatively OPTIMIZE_CXXFLAGS can be set in configure.host.
688 # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
689 AC_SUBST(OPTIMIZE_CXXFLAGS)
691 WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
692 AC_SUBST(WARN_FLAGS)
693 ])
696 dnl
697 dnl All installation directory information is determined here.
698 dnl
699 dnl Substs:
700 dnl gxx_install_dir
701 dnl glibcxx_prefixdir
702 dnl glibcxx_toolexecdir
703 dnl glibcxx_toolexeclibdir
704 dnl
705 dnl Assumes cross_compiling bits already done, and with_cross_host in
706 dnl particular.
707 dnl
708 dnl This logic must match gcc/configure.ac's setting of gcc_gxx_include_dir.
709 dnl config/gxx-include-dir.m4 must be kept consistant with this as well.
710 AC_DEFUN([GLIBCXX_EXPORT_INSTALL_INFO], [
711 glibcxx_toolexecdir=no
712 glibcxx_toolexeclibdir=no
713 glibcxx_prefixdir=$prefix
715 AC_MSG_CHECKING([for gxx-include-dir])
716 AC_ARG_WITH([gxx-include-dir],
717 AC_HELP_STRING([--with-gxx-include-dir=DIR],
718 [installation directory for include files]),
719 [case "$withval" in
720 yes) AC_MSG_ERROR([Missing directory for --with-gxx-include-dir]) ;;
721 no) gxx_include_dir=no ;;
722 *) gxx_include_dir=$withval ;;
723 esac],
724 [gxx_include_dir=no])
725 AC_MSG_RESULT($gxx_include_dir)
727 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
728 AC_ARG_ENABLE([version-specific-runtime-libs],
729 AC_HELP_STRING([--enable-version-specific-runtime-libs],
730 [Specify that runtime libraries should be installed in a compiler-specific directory]),
731 [case "$enableval" in
732 yes) version_specific_libs=yes ;;
733 no) version_specific_libs=no ;;
734 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
735 esac],
736 [version_specific_libs=no])
737 AC_MSG_RESULT($version_specific_libs)
739 GCC_WITH_TOOLEXECLIBDIR
741 # Default case for install directory for include files.
742 if test $version_specific_libs = no && test $gxx_include_dir = no; then
743 gxx_include_dir='include/c++/${gcc_version}'
744 if test -n "$with_cross_host" &&
745 test x"$with_cross_host" != x"no"; then
746 gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"
747 else
748 gxx_include_dir='${prefix}/'"$gxx_include_dir"
749 fi
750 fi
752 # Version-specific runtime libs processing.
753 if test $version_specific_libs = yes; then
754 # Need the gcc compiler version to know where to install libraries
755 # and header files if --enable-version-specific-runtime-libs option
756 # is selected. FIXME: these variables are misnamed, there are
757 # no executables installed in _toolexecdir or _toolexeclibdir.
758 if test x"$gxx_include_dir" = x"no"; then
759 gxx_include_dir='${libdir}/gcc/${host_alias}/${gcc_version}/include/c++'
760 fi
761 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
762 glibcxx_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
763 fi
765 # Calculate glibcxx_toolexecdir, glibcxx_toolexeclibdir
766 # Install a library built with a cross compiler in tooldir, not libdir.
767 if test x"$glibcxx_toolexecdir" = x"no"; then
768 if test -n "$with_cross_host" &&
769 test x"$with_cross_host" != x"no"; then
770 glibcxx_toolexecdir='${exec_prefix}/${host_alias}'
771 case ${with_toolexeclibdir} in
772 no)
773 glibcxx_toolexeclibdir='${toolexecdir}/lib'
774 ;;
775 *)
776 glibcxx_toolexeclibdir=${with_toolexeclibdir}
777 ;;
778 esac
779 else
780 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
781 glibcxx_toolexeclibdir='${libdir}'
782 fi
783 multi_os_directory=`$CXX -print-multi-os-directory`
784 case $multi_os_directory in
785 .) ;; # Avoid trailing /.
786 *) glibcxx_toolexeclibdir=$glibcxx_toolexeclibdir/$multi_os_directory ;;
787 esac
788 fi
790 AC_MSG_CHECKING([for install location])
791 AC_MSG_RESULT($gxx_include_dir)
793 AC_SUBST(glibcxx_prefixdir)
794 AC_SUBST(gxx_include_dir)
795 AC_SUBST(glibcxx_toolexecdir)
796 AC_SUBST(glibcxx_toolexeclibdir)
797 ])
800 dnl
801 dnl GLIBCXX_ENABLE
802 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
803 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
804 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
805 dnl
806 dnl See manual/appendix_porting.html#appendix.porting.build_hacking for
807 dnl documentation.
808 dnl
809 m4_define([GLIBCXX_ENABLE],[dnl
810 m4_define([_g_switch],[--enable-$1])dnl
811 m4_define([_g_help],[AC_HELP_STRING([_g_switch$3],[$4 @<:@default=$2@:>@])])dnl
812 AC_ARG_ENABLE([$1],m4_dquote(_g_help),
813 m4_bmatch([$5],
814 [^permit ],
815 [[
816 case "$enableval" in
817 m4_bpatsubst([$5],[permit ])) ;;
818 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
819 dnl Idea for future: generate a URL pointing to
820 dnl "onlinedocs/configopts.html#whatever"
821 esac
822 ]],
823 [^$],
824 [[
825 case "$enableval" in
826 yes|no) ;;
827 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
828 esac
829 ]],
830 [[$5]]),
831 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
832 m4_undefine([_g_switch])dnl
833 m4_undefine([_g_help])dnl
834 ])
837 dnl
838 dnl Check for ISO/IEC 9899:1999 "C99" support.
839 dnl
840 dnl --enable-c99 defines _GLIBCXX_USE_C99
841 dnl --disable-c99 leaves _GLIBCXX_USE_C99 undefined
842 dnl + Usage: GLIBCXX_ENABLE_C99[(DEFAULT)]
843 dnl Where DEFAULT is either `yes' or `no'.
844 dnl + If 'C99' stuff is not available, ignores DEFAULT and sets `no'.
845 dnl
846 AC_DEFUN([GLIBCXX_ENABLE_C99], [
847 GLIBCXX_ENABLE(c99,$1,,[turns on ISO/IEC 9899:1999 support])
849 if test x"$enable_c99" = x"yes"; then
850 AC_LANG_SAVE
851 AC_LANG_CPLUSPLUS
853 # Use -std=c++98 (instead of -std=gnu++98) because leaving __STRICT_ANSI__
854 # undefined may cause fake C99 facilities, like pre-standard snprintf,
855 # to be spuriously enabled.
856 ac_save_CXXFLAGS="$CXXFLAGS"
857 CXXFLAGS="$CXXFLAGS -std=c++98"
858 ac_save_LIBS="$LIBS"
859 ac_save_gcc_no_link="$gcc_no_link"
861 if test x$gcc_no_link != xyes; then
862 # Use -fno-exceptions to that the C driver can link these tests without
863 # hitting undefined references to personality routines.
864 CXXFLAGS="$CXXFLAGS -fno-exceptions"
865 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
866 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
867 gcc_no_link=yes
868 ])
869 fi
871 # Check for the existence of <math.h> functions used if C99 is enabled.
872 AC_CACHE_CHECK([for ISO C99 support in <math.h> for C++98],
873 glibcxx_cv_c99_math_cxx98, [
874 GCC_TRY_COMPILE_OR_LINK(
875 [#include <math.h>
876 volatile double d1, d2;
877 volatile int i;],
878 [i = fpclassify(d1);
879 i = isfinite(d1);
880 i = isinf(d1);
881 i = isnan(d1);
882 i = isnormal(d1);
883 i = signbit(d1);
884 i = isgreater(d1, d2);
885 i = isgreaterequal(d1, d2);
886 i = isless(d1, d2);
887 i = islessequal(d1, d2);
888 i = islessgreater(d1, d2);
889 i = islessgreater(d1, d2);
890 i = isunordered(d1, d2);
891 ], [glibcxx_cv_c99_math_cxx98=yes], [glibcxx_cv_c99_math_cxx98=no])
892 ])
893 if test x"$glibcxx_cv_c99_math_cxx98" = x"yes"; then
894 AC_DEFINE(_GLIBCXX98_USE_C99_MATH, 1,
895 [Define if C99 functions or macros in <math.h> should be imported
896 in <cmath> in namespace std for C++98.])
897 fi
899 # Check for the existence of <complex.h> complex math functions.
900 # This is necessary even though libstdc++ uses the builtin versions
901 # of these functions, because if the builtin cannot be used, a reference
902 # to the library function is emitted.
903 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
904 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
905 if test x"$ac_has_complex_h" = x"yes"; then
906 AC_CACHE_CHECK([for ISO C99 support in <complex.h> for C++98],
907 glibcxx_cv_c99_complex_cxx98, [
908 GCC_TRY_COMPILE_OR_LINK(
909 [#include <complex.h>
910 typedef __complex__ float float_type;
911 typedef __complex__ double double_type;
912 typedef __complex__ long double ld_type;
913 volatile float_type tmpf;
914 volatile double_type tmpd;
915 volatile ld_type tmpld;
916 volatile float f;
917 volatile double d;
918 volatile long double ld;],
919 [f = cabsf(tmpf);
920 f = cargf(tmpf);
921 tmpf = ccosf(tmpf);
922 tmpf = ccoshf(tmpf);
923 tmpf = cexpf(tmpf);
924 tmpf = clogf(tmpf);
925 tmpf = csinf(tmpf);
926 tmpf = csinhf(tmpf);
927 tmpf = csqrtf(tmpf);
928 tmpf = ctanf(tmpf);
929 tmpf = ctanhf(tmpf);
930 tmpf = cpowf(tmpf, tmpf);
931 tmpf = cprojf(tmpf);
932 d = cabs(tmpd);
933 d = carg(tmpd);
934 tmpd = ccos(tmpd);
935 tmpd = ccosh(tmpd);
936 tmpd = cexp(tmpd);
937 tmpd = clog(tmpd);
938 tmpd = csin(tmpd);
939 tmpd = csinh(tmpd);
940 tmpd = csqrt(tmpd);
941 tmpd = ctan(tmpd);
942 tmpd = ctanh(tmpd);
943 tmpd = cpow(tmpd, tmpd);
944 tmpd = cproj(tmpd);
945 ld = cabsl(tmpld);
946 ld = cargl(tmpld);
947 tmpld = ccosl(tmpld);
948 tmpld = ccoshl(tmpld);
949 tmpld = cexpl(tmpld);
950 tmpld = clogl(tmpld);
951 tmpld = csinl(tmpld);
952 tmpld = csinhl(tmpld);
953 tmpld = csqrtl(tmpld);
954 tmpld = ctanl(tmpld);
955 tmpld = ctanhl(tmpld);
956 tmpld = cpowl(tmpld, tmpld);
957 tmpld = cprojl(tmpld);
958 ], [glibcxx_cv_c99_complex_cxx98=yes], [glibcxx_cv_c99_complex_cxx98=no])
959 ])
960 fi
961 if test x"$glibcxx_cv_c99_complex_cxx98" = x"yes"; then
962 AC_DEFINE(_GLIBCXX98_USE_C99_COMPLEX, 1,
963 [Define if C99 functions in <complex.h> should be used in
964 <complex> for C++98. Using compiler builtins for these functions
965 requires corresponding C99 library functions to be present.])
966 fi
968 # Check for the existence in <stdio.h> of vscanf, et. al.
969 AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++98],
970 glibcxx_cv_c99_stdio_cxx98, [
971 GCC_TRY_COMPILE_OR_LINK(
972 [#include <stdio.h>
973 #include <stdarg.h>
974 void foo(char* fmt, ...)
975 {
976 va_list args; va_start(args, fmt);
977 vfscanf(stderr, "%i", args);
978 vscanf("%i", args);
979 vsnprintf(fmt, 0, "%i", args);
980 vsscanf(fmt, "%i", args);
981 snprintf(fmt, 0, "%i");
982 }], [],
983 [glibcxx_cv_c99_stdio_cxx98=yes], [glibcxx_cv_c99_stdio_cxx98=no])
984 ])
985 if test x"$glibcxx_cv_c99_stdio_cxx98" = x"yes"; then
986 AC_DEFINE(_GLIBCXX98_USE_C99_STDIO, 1,
987 [Define if C99 functions or macros in <stdio.h> should be imported
988 in <cstdio> in namespace std for C++98.])
989 fi
991 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
992 AC_CACHE_CHECK([for ISO C99 support in <stdlib.h> for C++98],
993 glibcxx_cv_c99_stdlib_cxx98, [
994 GCC_TRY_COMPILE_OR_LINK(
995 [#include <stdlib.h>
996 volatile float f;
997 volatile long double ld;
998 volatile unsigned long long ll;
999 lldiv_t mydivt;],
1000 [char* tmp;
1001 f = strtof("gnu", &tmp);
1002 ld = strtold("gnu", &tmp);
1003 ll = strtoll("gnu", &tmp, 10);
1004 ll = strtoull("gnu", &tmp, 10);
1005 ll = llabs(10);
1006 mydivt = lldiv(10,1);
1007 ll = mydivt.quot;
1008 ll = mydivt.rem;
1009 ll = atoll("10");
1010 _Exit(0);
1011 ], [glibcxx_cv_c99_stdlib_cxx98=yes], [glibcxx_cv_c99_stdlib_cxx98=no])
1012 ])
1013 if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
1014 AC_DEFINE(_GLIBCXX98_USE_C99_STDLIB, 1,
1015 [Define if C99 functions or macros in <stdlib.h> should be imported
1016 in <cstdlib> in namespace std for C++98.])
1017 fi
1019 # Check for the existence in <wchar.h> of wcstold, etc.
1020 if test x"$ac_has_wchar_h" = xyes &&
1021 test x"$ac_has_wctype_h" = xyes; then
1022 AC_CACHE_CHECK([for ISO C99 support in <wchar.h> for C++98],
1023 glibcxx_cv_c99_wchar_cxx98, [
1024 AC_TRY_COMPILE([#include <wchar.h>
1025 namespace test
1026 {
1027 using ::wcstold;
1028 using ::wcstoll;
1029 using ::wcstoull;
1030 }
1031 ], [], [glibcxx_cv_c99_wchar_cxx98=yes], [glibcxx_cv_c99_wchar_cxx98=no])
1032 ])
1034 # Checks for wide character functions that may not be present.
1035 # Injection of these is wrapped with guard macros.
1036 # NB: only put functions here, instead of immediately above, if
1037 # absolutely necessary.
1038 AC_TRY_COMPILE([#include <wchar.h>
1039 namespace test { using ::vfwscanf; }], [],
1040 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1042 AC_TRY_COMPILE([#include <wchar.h>
1043 namespace test { using ::vswscanf; }], [],
1044 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1046 AC_TRY_COMPILE([#include <wchar.h>
1047 namespace test { using ::vwscanf; }], [],
1048 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1050 AC_TRY_COMPILE([#include <wchar.h>
1051 namespace test { using ::wcstof; }], [],
1052 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1054 AC_TRY_COMPILE([#include <wctype.h>],
1055 [wint_t t; int i = iswblank(t);],
1056 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1058 if test x"$glibcxx_cv_c99_wchar_cxx98" = x"yes"; then
1059 AC_DEFINE(_GLIBCXX98_USE_C99_WCHAR, 1,
1060 [Define if C99 functions or macros in <wchar.h> should be imported
1061 in <cwchar> in namespace std for C++98.])
1062 fi
1063 fi
1065 # Option parsed, now set things appropriately.
1066 if test x"$glibcxx_cv_c99_math_cxx98" = x"no" ||
1067 test x"$glibcxx_cv_c99_complex_cxx98" = x"no" ||
1068 test x"$glibcxx_cv_c99_stdio_cxx98" = x"no" ||
1069 test x"$glibcxx_cv_c99_stdlib_cxx98" = x"no" ||
1070 test x"$glibcxx_cv_c99_wchar_cxx98" = x"no"; then
1071 enable_c99=no;
1072 else
1073 AC_DEFINE(_GLIBCXX_USE_C99, 1,
1074 [Define if C99 functions or macros from <wchar.h>, <math.h>,
1075 <complex.h>, <stdio.h>, and <stdlib.h> can be used or exposed.])
1076 fi
1078 gcc_no_link="$ac_save_gcc_no_link"
1079 LIBS="$ac_save_LIBS"
1080 CXXFLAGS="$ac_save_CXXFLAGS"
1081 AC_LANG_RESTORE
1083 AC_LANG_SAVE
1084 AC_LANG_CPLUSPLUS
1086 # Use -std=c++11 and test again for C99 library feature in C++11 mode.
1087 # For the reasons given above we use -std=c++11 not -std=gnu++11.
1088 ac_save_CXXFLAGS="$CXXFLAGS"
1089 CXXFLAGS="$CXXFLAGS -std=c++11"
1090 ac_save_LIBS="$LIBS"
1091 ac_save_gcc_no_link="$gcc_no_link"
1093 if test x$gcc_no_link != xyes; then
1094 # Use -fno-exceptions to that the C driver can link these tests without
1095 # hitting undefined references to personality routines.
1096 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1097 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
1098 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
1099 gcc_no_link=yes
1100 ])
1101 fi
1103 # Check for the existence of <math.h> functions used if C99 is enabled.
1104 AC_CACHE_CHECK([for ISO C99 support in <math.h> for C++11],
1105 glibcxx_cv_c99_math_cxx11, [
1106 GCC_TRY_COMPILE_OR_LINK(
1107 [#include <math.h>
1108 volatile double d1, d2;
1109 volatile int i;],
1110 [i = fpclassify(d1);
1111 i = isfinite(d1);
1112 i = isinf(d1);
1113 i = isnan(d1);
1114 i = isnormal(d1);
1115 i = signbit(d1);
1116 i = isgreater(d1, d2);
1117 i = isgreaterequal(d1, d2);
1118 i = isless(d1, d2);
1119 i = islessequal(d1, d2);
1120 i = islessgreater(d1, d2);
1121 i = islessgreater(d1, d2);
1122 i = isunordered(d1, d2);
1123 ], [glibcxx_cv_c99_math_cxx11=yes], [glibcxx_cv_c99_math_cxx11=no])
1124 ])
1125 if test x"$glibcxx_cv_c99_math_cxx11" = x"yes"; then
1126 AC_DEFINE(_GLIBCXX11_USE_C99_MATH, 1,
1127 [Define if C99 functions or macros in <math.h> should be imported
1128 in <cmath> in namespace std for C++11.])
1129 fi
1131 # Check for the existence of <complex.h> complex math functions.
1132 # This is necessary even though libstdc++ uses the builtin versions
1133 # of these functions, because if the builtin cannot be used, a reference
1134 # to the library function is emitted.
1135 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
1136 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1137 if test x"$ac_has_complex_h" = x"yes"; then
1138 AC_CACHE_CHECK([for ISO C99 support in <complex.h> for C++11],
1139 glibcxx_cv_c99_complex_cxx11, [
1140 GCC_TRY_COMPILE_OR_LINK(
1141 [#include <complex.h>
1142 typedef __complex__ float float_type;
1143 typedef __complex__ double double_type;
1144 typedef __complex__ long double ld_type;
1145 volatile float_type tmpf;
1146 volatile double_type tmpd;
1147 volatile ld_type tmpld;
1148 volatile float f;
1149 volatile double d;
1150 volatile long double ld;],
1151 [f = cabsf(tmpf);
1152 f = cargf(tmpf);
1153 tmpf = ccosf(tmpf);
1154 tmpf = ccoshf(tmpf);
1155 tmpf = cexpf(tmpf);
1156 tmpf = clogf(tmpf);
1157 tmpf = csinf(tmpf);
1158 tmpf = csinhf(tmpf);
1159 tmpf = csqrtf(tmpf);
1160 tmpf = ctanf(tmpf);
1161 tmpf = ctanhf(tmpf);
1162 tmpf = cpowf(tmpf, tmpf);
1163 tmpf = cprojf(tmpf);
1164 d = cabs(tmpd);
1165 d = carg(tmpd);
1166 tmpd = ccos(tmpd);
1167 tmpd = ccosh(tmpd);
1168 tmpd = cexp(tmpd);
1169 tmpd = clog(tmpd);
1170 tmpd = csin(tmpd);
1171 tmpd = csinh(tmpd);
1172 tmpd = csqrt(tmpd);
1173 tmpd = ctan(tmpd);
1174 tmpd = ctanh(tmpd);
1175 tmpd = cpow(tmpd, tmpd);
1176 tmpd = cproj(tmpd);
1177 ld = cabsl(tmpld);
1178 ld = cargl(tmpld);
1179 tmpld = ccosl(tmpld);
1180 tmpld = ccoshl(tmpld);
1181 tmpld = cexpl(tmpld);
1182 tmpld = clogl(tmpld);
1183 tmpld = csinl(tmpld);
1184 tmpld = csinhl(tmpld);
1185 tmpld = csqrtl(tmpld);
1186 tmpld = ctanl(tmpld);
1187 tmpld = ctanhl(tmpld);
1188 tmpld = cpowl(tmpld, tmpld);
1189 tmpld = cprojl(tmpld);
1190 ], [glibcxx_cv_c99_complex_cxx11=yes], [glibcxx_cv_c99_complex_cxx11=no])
1191 ])
1192 fi
1193 if test x"$glibcxx_cv_c99_complex_cxx11" = x"yes"; then
1194 AC_DEFINE(_GLIBCXX11_USE_C99_COMPLEX, 1,
1195 [Define if C99 functions in <complex.h> should be used in
1196 <complex> for C++11. Using compiler builtins for these functions
1197 requires corresponding C99 library functions to be present.])
1198 fi
1200 # Check for the existence in <stdio.h> of vscanf, et. al.
1201 AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++11],
1202 glibcxx_cv_c99_stdio_cxx11, [
1203 GCC_TRY_COMPILE_OR_LINK(
1204 [#include <stdio.h>
1205 #include <stdarg.h>
1206 void foo(char* fmt, ...)
1207 {
1208 va_list args; va_start(args, fmt);
1209 vfscanf(stderr, "%i", args);
1210 vscanf("%i", args);
1211 vsnprintf(fmt, 0, "%i", args);
1212 vsscanf(fmt, "%i", args);
1213 snprintf(fmt, 0, "%i");
1214 }], [],
1215 [glibcxx_cv_c99_stdio_cxx11=yes], [glibcxx_cv_c99_stdio_cxx11=no])
1216 ])
1217 if test x"$glibcxx_cv_c99_stdio_cxx11" = x"yes"; then
1218 AC_DEFINE(_GLIBCXX11_USE_C99_STDIO, 1,
1219 [Define if C99 functions or macros in <stdio.h> should be imported
1220 in <cstdio> in namespace std for C++11.])
1221 fi
1223 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
1224 AC_CACHE_CHECK([for ISO C99 support in <stdlib.h> for C++11],
1225 glibcxx_cv_c99_stdlib_cxx11, [
1226 GCC_TRY_COMPILE_OR_LINK(
1227 [#include <stdlib.h>
1228 volatile float f;
1229 volatile long double ld;
1230 volatile unsigned long long ll;
1231 lldiv_t mydivt;],
1232 [char* tmp;
1233 f = strtof("gnu", &tmp);
1234 ld = strtold("gnu", &tmp);
1235 ll = strtoll("gnu", &tmp, 10);
1236 ll = strtoull("gnu", &tmp, 10);
1237 ll = llabs(10);
1238 mydivt = lldiv(10,1);
1239 ll = mydivt.quot;
1240 ll = mydivt.rem;
1241 ll = atoll("10");
1242 _Exit(0);
1243 ], [glibcxx_cv_c99_stdlib_cxx11=yes], [glibcxx_cv_c99_stdlib_cxx11=no])
1244 ])
1245 if test x"$glibcxx_cv_c99_stdlib_cxx11" = x"yes"; then
1246 AC_DEFINE(_GLIBCXX11_USE_C99_STDLIB, 1,
1247 [Define if C99 functions or macros in <stdlib.h> should be imported
1248 in <cstdlib> in namespace std for C++11.])
1249 fi
1251 # Check for the existence in <wchar.h> of wcstold, etc.
1252 if test x"$ac_has_wchar_h" = xyes &&
1253 test x"$ac_has_wctype_h" = xyes; then
1254 AC_CACHE_CHECK([for ISO C99 support in <wchar.h> for C++11],
1255 glibcxx_cv_c99_wchar_cxx11, [
1256 AC_TRY_COMPILE([#include <wchar.h>
1257 namespace test
1258 {
1259 using ::wcstold;
1260 using ::wcstoll;
1261 using ::wcstoull;
1262 }
1263 ], [], [glibcxx_cv_c99_wchar_cxx11=yes], [glibcxx_cv_c99_wchar_cxx11=no])
1264 ])
1266 # Checks for wide character functions that may not be present.
1267 # Injection of these is wrapped with guard macros.
1268 # NB: only put functions here, instead of immediately above, if
1269 # absolutely necessary.
1270 AC_TRY_COMPILE([#include <wchar.h>
1271 namespace test { using ::vfwscanf; }], [],
1272 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1274 AC_TRY_COMPILE([#include <wchar.h>
1275 namespace test { using ::vswscanf; }], [],
1276 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1278 AC_TRY_COMPILE([#include <wchar.h>
1279 namespace test { using ::vwscanf; }], [],
1280 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1282 AC_TRY_COMPILE([#include <wchar.h>
1283 namespace test { using ::wcstof; }], [],
1284 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1286 AC_TRY_COMPILE([#include <wctype.h>],
1287 [wint_t t; int i = iswblank(t);],
1288 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1290 if test x"$glibcxx_cv_c99_wchar_cxx11" = x"yes"; then
1291 AC_DEFINE(_GLIBCXX11_USE_C99_WCHAR, 1,
1292 [Define if C99 functions or macros in <wchar.h> should be imported
1293 in <cwchar> in namespace std for C++11.])
1294 fi
1295 fi
1297 gcc_no_link="$ac_save_gcc_no_link"
1298 LIBS="$ac_save_LIBS"
1299 CXXFLAGS="$ac_save_CXXFLAGS"
1300 AC_LANG_RESTORE
1301 fi
1303 AC_MSG_CHECKING([for fully enabled ISO C99 support])
1304 AC_MSG_RESULT($enable_c99)
1305 ])
1308 dnl
1309 dnl Check for clock_gettime, nanosleep and sched_yield, used in the
1310 dnl implementation of 20.11.7 [time.clock], and 30.3.2 [thread.thread.this]
1311 dnl in the C++11 standard.
1312 dnl
1313 dnl --enable-libstdcxx-time
1314 dnl --enable-libstdcxx-time=yes
1315 dnl checks for the availability of monotonic and realtime clocks,
1316 dnl nanosleep and sched_yield in libc.
1317 dnl --enable-libstdcxx-time=rt
1318 dnl also searches (and, if needed, links) librt. Note that this is
1319 dnl not always desirable because, in glibc 2.16 and earlier, for
1320 dnl example, in turn it triggers the linking of libpthread too,
1321 dnl which activates locking,
1322 dnl a large overhead for single-thread programs.
1323 dnl --enable-libstdcxx-time=no
1324 dnl --disable-libstdcxx-time
1325 dnl disables the checks completely
1326 dnl
1327 dnl N.B. Darwin provides nanosleep but doesn't support the whole POSIX
1328 dnl Timers option, so doesn't define _POSIX_TIMERS. Because the test
1329 dnl below fails Darwin unconditionally defines _GLIBCXX_USE_NANOSLEEP in
1330 dnl os_defines.h and also defines _GLIBCXX_USE_SCHED_YIELD.
1331 dnl
1332 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
1334 GLIBCXX_ENABLE(libstdcxx-time,auto,[[[=KIND]]],
1335 [use KIND for check type],
1336 [permit yes|no|rt])
1338 AC_LANG_SAVE
1339 AC_LANG_CPLUSPLUS
1340 ac_save_CXXFLAGS="$CXXFLAGS"
1341 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1342 ac_save_LIBS="$LIBS"
1344 ac_has_clock_monotonic=no
1345 ac_has_clock_realtime=no
1346 ac_has_nanosleep=no
1347 ac_has_sched_yield=no
1349 if test x"$enable_libstdcxx_time" = x"auto"; then
1351 case "${target_os}" in
1352 cygwin*)
1353 ac_has_nanosleep=yes
1354 ;;
1355 darwin*)
1356 ac_has_nanosleep=yes
1357 ac_has_sched_yield=yes
1358 ;;
1359 # VxWorks has nanosleep as soon as the kernel is configured with
1360 # INCLUDE_POSIX_TIMERS, which is normally/most-often the case.
1361 vxworks*)
1362 ac_has_nanosleep=yes
1363 ;;
1364 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
1365 # Don't use link test for freestanding library, in case gcc_no_link=yes
1366 if test x"$is_hosted" = xyes; then
1367 # Versions of glibc before 2.17 needed -lrt for clock_gettime.
1368 AC_SEARCH_LIBS(clock_gettime, [rt])
1369 if test x"$ac_cv_search_clock_gettime" = x"none required"; then
1370 ac_has_clock_monotonic=yes
1371 ac_has_clock_realtime=yes
1372 fi
1373 fi
1374 ac_has_nanosleep=yes
1375 ac_has_sched_yield=yes
1376 ;;
1377 freebsd*|netbsd*|dragonfly*|rtems*)
1378 ac_has_clock_monotonic=yes
1379 ac_has_clock_realtime=yes
1380 ac_has_nanosleep=yes
1381 ac_has_sched_yield=yes
1382 ;;
1383 openbsd*)
1384 ac_has_clock_monotonic=yes
1385 ac_has_clock_realtime=yes
1386 ac_has_nanosleep=yes
1387 ;;
1388 solaris*)
1389 ac_has_clock_monotonic=yes
1390 ac_has_clock_realtime=yes
1391 ac_has_nanosleep=yes
1392 ac_has_sched_yield=yes
1393 ;;
1394 uclinux*)
1395 ac_has_nanosleep=yes
1396 ac_has_sched_yield=yes
1397 esac
1399 elif test x"$enable_libstdcxx_time" != x"no"; then
1401 if test x"$enable_libstdcxx_time" = x"rt"; then
1402 AC_SEARCH_LIBS(clock_gettime, [rt])
1403 AC_SEARCH_LIBS(nanosleep, [rt])
1404 else
1405 AC_CHECK_FUNC(clock_gettime)
1406 AC_CHECK_FUNC(nanosleep)
1407 fi
1409 case "$ac_cv_search_clock_gettime" in
1410 -l*) GLIBCXX_LIBS=$ac_cv_search_clock_gettime
1411 ;;
1412 esac
1413 case "$ac_cv_search_nanosleep" in
1414 -l*) GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_nanosleep"
1415 ;;
1416 esac
1418 AC_SEARCH_LIBS(sched_yield, [rt])
1420 case "$ac_cv_search_sched_yield" in
1421 -lrt*)
1422 if test x"$enable_libstdcxx_time" = x"rt"; then
1423 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1424 ac_has_sched_yield=yes
1425 fi
1426 ;;
1427 *)
1428 ac_has_sched_yield=yes
1429 ;;
1430 esac
1432 AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
1434 if test x"$ac_has_unistd_h" = x"yes"; then
1435 AC_MSG_CHECKING([for monotonic clock])
1436 AC_TRY_LINK(
1437 [#include <unistd.h>
1438 #include <time.h>
1439 ],
1440 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1441 timespec tp;
1442 #endif
1443 clock_gettime(CLOCK_MONOTONIC, &tp);
1444 ], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
1446 AC_MSG_RESULT($ac_has_clock_monotonic)
1448 AC_MSG_CHECKING([for realtime clock])
1449 AC_TRY_LINK(
1450 [#include <unistd.h>
1451 #include <time.h>
1452 ],
1453 [#if _POSIX_TIMERS > 0
1454 timespec tp;
1455 #endif
1456 clock_gettime(CLOCK_REALTIME, &tp);
1457 ], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
1459 AC_MSG_RESULT($ac_has_clock_realtime)
1461 AC_MSG_CHECKING([for nanosleep])
1462 AC_TRY_LINK(
1463 [#include <unistd.h>
1464 #include <time.h>
1465 ],
1466 [#if _POSIX_TIMERS > 0
1467 timespec tp;
1468 #endif
1469 nanosleep(&tp, 0);
1470 ], [ac_has_nanosleep=yes], [ac_has_nanosleep=no])
1472 AC_MSG_RESULT($ac_has_nanosleep)
1473 fi
1474 fi
1476 if test x"$ac_has_clock_monotonic" != x"yes"; then
1477 case ${target_os} in
1478 linux* | uclinux*)
1479 AC_MSG_CHECKING([for clock_gettime syscall])
1480 AC_TRY_COMPILE(
1481 [#include <unistd.h>
1482 #include <time.h>
1483 #include <sys/syscall.h>
1484 ],
1485 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1486 timespec tp;
1487 #endif
1488 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp);
1489 syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);
1490 ], [ac_has_clock_gettime_syscall=yes], [ac_has_clock_gettime_syscall=no])
1491 AC_MSG_RESULT($ac_has_clock_gettime_syscall)
1492 if test x"$ac_has_clock_gettime_syscall" = x"yes"; then
1493 AC_DEFINE(_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL, 1,
1494 [Defined if clock_gettime syscall has monotonic and realtime clock support. ])
1495 ac_has_clock_monotonic=yes
1496 ac_has_clock_realtime=yes
1497 AC_MSG_CHECKING([for struct timespec that matches syscall])
1498 AC_TRY_COMPILE(
1499 [#include <time.h>
1500 #include <sys/syscall.h>
1501 ],
1502 [#ifdef SYS_clock_gettime64
1503 #if SYS_clock_gettime64 != SYS_clock_gettime
1504 // We need to use SYS_clock_gettime and libc appears to
1505 // also know about the SYS_clock_gettime64 syscall.
1506 // Check that userspace doesn't use time64 version of timespec.
1507 static_assert(sizeof(timespec::tv_sec) == sizeof(long),
1508 "struct timespec must be compatible with SYS_clock_gettime");
1509 #endif
1510 #endif
1511 ],
1512 [ac_timespec_matches_syscall=yes],
1513 [ac_timespec_matches_syscall=no])
1514 AC_MSG_RESULT($ac_timespec_matches_syscall)
1515 if test x"$ac_timespec_matches_syscall" = no; then
1516 AC_MSG_ERROR([struct timespec is not compatible with SYS_clock_gettime, please report a bug to http://gcc.gnu.org/bugzilla])
1517 fi
1518 fi;;
1519 esac
1520 fi
1522 if test x"$ac_has_clock_monotonic" = x"yes"; then
1523 AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
1524 [ Defined if clock_gettime has monotonic clock support. ])
1525 fi
1527 if test x"$ac_has_clock_realtime" = x"yes"; then
1528 AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
1529 [ Defined if clock_gettime has realtime clock support. ])
1530 fi
1532 if test x"$ac_has_sched_yield" = x"yes"; then
1533 AC_DEFINE(_GLIBCXX_USE_SCHED_YIELD, 1,
1534 [ Defined if sched_yield is available. ])
1535 fi
1537 if test x"$ac_has_nanosleep" = x"yes"; then
1538 AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
1539 [ Defined if nanosleep is available. ])
1540 else
1541 AC_MSG_CHECKING([for sleep])
1542 AC_TRY_COMPILE([#include <unistd.h>],
1543 [sleep(1)],
1544 [ac_has_sleep=yes],[ac_has_sleep=no])
1545 if test x"$ac_has_sleep" = x"yes"; then
1546 AC_DEFINE(HAVE_SLEEP,1, [Defined if sleep exists.])
1547 fi
1548 AC_MSG_RESULT($ac_has_sleep)
1549 AC_MSG_CHECKING([for usleep])
1550 AC_TRY_COMPILE([#include <unistd.h>],
1551 [sleep(1);
1552 usleep(100);],
1553 [ac_has_usleep=yes],[ac_has_usleep=no])
1554 if test x"$ac_has_usleep" = x"yes"; then
1555 AC_DEFINE(HAVE_USLEEP,1, [Defined if usleep exists.])
1556 fi
1557 AC_MSG_RESULT($ac_has_usleep)
1558 fi
1560 if test x"$ac_has_nanosleep$ac_has_sleep" = x"nono"; then
1561 ac_no_sleep=yes
1562 AC_MSG_CHECKING([for Sleep])
1563 AC_TRY_COMPILE([#include <windows.h>],
1564 [Sleep(1)],
1565 [ac_has_win32_sleep=yes],[ac_has_win32_sleep=no])
1566 if test x"$ac_has_win32_sleep" = x"yes"; then
1567 AC_DEFINE(HAVE_WIN32_SLEEP,1, [Defined if Sleep exists.])
1568 ac_no_sleep=no
1569 fi
1570 AC_MSG_RESULT($ac_has_win32_sleep)
1571 fi
1573 if test x"$ac_no_sleep" = x"yes"; then
1574 AC_DEFINE(_GLIBCXX_NO_SLEEP,1, [Defined if no way to sleep is available.])
1575 fi
1577 AC_SUBST(GLIBCXX_LIBS)
1579 CXXFLAGS="$ac_save_CXXFLAGS"
1580 LIBS="$ac_save_LIBS"
1581 AC_LANG_RESTORE
1582 ])
1584 dnl
1585 dnl Check for gettimeofday, used in the implementation of 20.11.7
1586 dnl [time.clock] in the C++11 standard.
1587 dnl
1588 AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
1590 AC_MSG_CHECKING([for gettimeofday])
1592 AC_LANG_SAVE
1593 AC_LANG_CPLUSPLUS
1594 ac_save_CXXFLAGS="$CXXFLAGS"
1595 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1597 ac_has_gettimeofday=no;
1598 AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
1599 if test x"$ac_has_sys_time_h" = x"yes"; then
1600 AC_MSG_CHECKING([for gettimeofday])
1601 GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
1602 [timeval tv; gettimeofday(&tv, 0);],
1603 [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
1605 AC_MSG_RESULT($ac_has_gettimeofday)
1606 fi
1608 if test x"$ac_has_gettimeofday" = x"yes"; then
1609 AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
1610 [ Defined if gettimeofday is available. ])
1611 fi
1613 CXXFLAGS="$ac_save_CXXFLAGS"
1614 AC_LANG_RESTORE
1615 ])
1617 dnl
1618 dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
1619 dnl facilities in Chapter 8, "C compatibility".
1620 dnl
1621 AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
1623 AC_LANG_SAVE
1624 AC_LANG_CPLUSPLUS
1626 # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
1627 # undefined and fake C99 facilities may be spuriously enabled.
1628 ac_save_CXXFLAGS="$CXXFLAGS"
1629 CXXFLAGS="$CXXFLAGS -std=c++98"
1631 # Check for the existence of <complex.h> complex math functions used
1632 # by tr1/complex.
1633 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1634 ac_c99_complex_tr1=no;
1635 if test x"$ac_has_complex_h" = x"yes"; then
1636 AC_MSG_CHECKING([for ISO C99 support to TR1 in <complex.h>])
1637 AC_TRY_COMPILE([#include <complex.h>],
1638 [typedef __complex__ float float_type; float_type tmpf;
1639 cacosf(tmpf);
1640 casinf(tmpf);
1641 catanf(tmpf);
1642 cacoshf(tmpf);
1643 casinhf(tmpf);
1644 catanhf(tmpf);
1645 typedef __complex__ double double_type; double_type tmpd;
1646 cacos(tmpd);
1647 casin(tmpd);
1648 catan(tmpd);
1649 cacosh(tmpd);
1650 casinh(tmpd);
1651 catanh(tmpd);
1652 typedef __complex__ long double ld_type; ld_type tmpld;
1653 cacosl(tmpld);
1654 casinl(tmpld);
1655 catanl(tmpld);
1656 cacoshl(tmpld);
1657 casinhl(tmpld);
1658 catanhl(tmpld);
1659 ],[ac_c99_complex_tr1=yes], [ac_c99_complex_tr1=no])
1660 fi
1661 AC_MSG_RESULT($ac_c99_complex_tr1)
1662 if test x"$ac_c99_complex_tr1" = x"yes"; then
1663 AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_TR1, 1,
1664 [Define if C99 functions in <complex.h> should be used in
1665 <tr1/complex>. Using compiler builtins for these functions
1666 requires corresponding C99 library functions to be present.])
1667 fi
1669 # Check for the existence of <ctype.h> functions.
1670 AC_CACHE_CHECK([for ISO C99 support to TR1 in <ctype.h>],
1671 glibcxx_cv_c99_ctype_tr1, [
1672 AC_TRY_COMPILE([#include <ctype.h>],
1673 [int ch;
1674 int ret;
1675 ret = isblank(ch);
1676 ],[glibcxx_cv_c99_ctype_tr1=yes],
1677 [glibcxx_cv_c99_ctype_tr1=no])
1678 ])
1679 if test x"$glibcxx_cv_c99_ctype_tr1" = x"yes"; then
1680 AC_DEFINE(_GLIBCXX_USE_C99_CTYPE_TR1, 1,
1681 [Define if C99 functions in <ctype.h> should be imported in
1682 <tr1/cctype> in namespace std::tr1.])
1683 fi
1685 # Check for the existence of <fenv.h> functions.
1686 AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no)
1687 ac_c99_fenv_tr1=no;
1688 if test x"$ac_has_fenv_h" = x"yes"; then
1689 AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>])
1690 AC_TRY_COMPILE([#include <fenv.h>],
1691 [int except, mode;
1692 fexcept_t* pflag;
1693 fenv_t* penv;
1694 int ret;
1695 ret = feclearexcept(except);
1696 ret = fegetexceptflag(pflag, except);
1697 ret = feraiseexcept(except);
1698 ret = fesetexceptflag(pflag, except);
1699 ret = fetestexcept(except);
1700 ret = fegetround();
1701 ret = fesetround(mode);
1702 ret = fegetenv(penv);
1703 ret = feholdexcept(penv);
1704 ret = fesetenv(penv);
1705 ret = feupdateenv(penv);
1706 ],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no])
1707 AC_MSG_RESULT($ac_c99_fenv_tr1)
1708 fi
1709 if test x"$ac_c99_fenv_tr1" = x"yes"; then
1710 AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1,
1711 [Define if C99 functions in <fenv.h> should be imported in
1712 <tr1/cfenv> in namespace std::tr1.])
1713 fi
1715 # Check for the existence of <stdint.h> types.
1716 AC_CACHE_CHECK([for ISO C99 support to TR1 in <stdint.h>],
1717 glibcxx_cv_c99_stdint_tr1, [
1718 AC_TRY_COMPILE([#define __STDC_LIMIT_MACROS
1719 #define __STDC_CONSTANT_MACROS
1720 #include <stdint.h>],
1721 [typedef int8_t my_int8_t;
1722 my_int8_t i8 = INT8_MIN;
1723 i8 = INT8_MAX;
1724 typedef int16_t my_int16_t;
1725 my_int16_t i16 = INT16_MIN;
1726 i16 = INT16_MAX;
1727 typedef int32_t my_int32_t;
1728 my_int32_t i32 = INT32_MIN;
1729 i32 = INT32_MAX;
1730 typedef int64_t my_int64_t;
1731 my_int64_t i64 = INT64_MIN;
1732 i64 = INT64_MAX;
1733 typedef int_fast8_t my_int_fast8_t;
1734 my_int_fast8_t if8 = INT_FAST8_MIN;
1735 if8 = INT_FAST8_MAX;
1736 typedef int_fast16_t my_int_fast16_t;
1737 my_int_fast16_t if16 = INT_FAST16_MIN;
1738 if16 = INT_FAST16_MAX;
1739 typedef int_fast32_t my_int_fast32_t;
1740 my_int_fast32_t if32 = INT_FAST32_MIN;
1741 if32 = INT_FAST32_MAX;
1742 typedef int_fast64_t my_int_fast64_t;
1743 my_int_fast64_t if64 = INT_FAST64_MIN;
1744 if64 = INT_FAST64_MAX;
1745 typedef int_least8_t my_int_least8_t;
1746 my_int_least8_t il8 = INT_LEAST8_MIN;
1747 il8 = INT_LEAST8_MAX;
1748 typedef int_least16_t my_int_least16_t;
1749 my_int_least16_t il16 = INT_LEAST16_MIN;
1750 il16 = INT_LEAST16_MAX;
1751 typedef int_least32_t my_int_least32_t;
1752 my_int_least32_t il32 = INT_LEAST32_MIN;
1753 il32 = INT_LEAST32_MAX;
1754 typedef int_least64_t my_int_least64_t;
1755 my_int_least64_t il64 = INT_LEAST64_MIN;
1756 il64 = INT_LEAST64_MAX;
1757 typedef intmax_t my_intmax_t;
1758 my_intmax_t im = INTMAX_MAX;
1759 im = INTMAX_MIN;
1760 typedef intptr_t my_intptr_t;
1761 my_intptr_t ip = INTPTR_MAX;
1762 ip = INTPTR_MIN;
1763 typedef uint8_t my_uint8_t;
1764 my_uint8_t ui8 = UINT8_MAX;
1765 ui8 = UINT8_MAX;
1766 typedef uint16_t my_uint16_t;
1767 my_uint16_t ui16 = UINT16_MAX;
1768 ui16 = UINT16_MAX;
1769 typedef uint32_t my_uint32_t;
1770 my_uint32_t ui32 = UINT32_MAX;
1771 ui32 = UINT32_MAX;
1772 typedef uint64_t my_uint64_t;
1773 my_uint64_t ui64 = UINT64_MAX;
1774 ui64 = UINT64_MAX;
1775 typedef uint_fast8_t my_uint_fast8_t;
1776 my_uint_fast8_t uif8 = UINT_FAST8_MAX;
1777 uif8 = UINT_FAST8_MAX;
1778 typedef uint_fast16_t my_uint_fast16_t;
1779 my_uint_fast16_t uif16 = UINT_FAST16_MAX;
1780 uif16 = UINT_FAST16_MAX;
1781 typedef uint_fast32_t my_uint_fast32_t;
1782 my_uint_fast32_t uif32 = UINT_FAST32_MAX;
1783 uif32 = UINT_FAST32_MAX;
1784 typedef uint_fast64_t my_uint_fast64_t;
1785 my_uint_fast64_t uif64 = UINT_FAST64_MAX;
1786 uif64 = UINT_FAST64_MAX;
1787 typedef uint_least8_t my_uint_least8_t;
1788 my_uint_least8_t uil8 = UINT_LEAST8_MAX;
1789 uil8 = UINT_LEAST8_MAX;
1790 typedef uint_least16_t my_uint_least16_t;
1791 my_uint_least16_t uil16 = UINT_LEAST16_MAX;
1792 uil16 = UINT_LEAST16_MAX;
1793 typedef uint_least32_t my_uint_least32_t;
1794 my_uint_least32_t uil32 = UINT_LEAST32_MAX;
1795 uil32 = UINT_LEAST32_MAX;
1796 typedef uint_least64_t my_uint_least64_t;
1797 my_uint_least64_t uil64 = UINT_LEAST64_MAX;
1798 uil64 = UINT_LEAST64_MAX;
1799 typedef uintmax_t my_uintmax_t;
1800 my_uintmax_t uim = UINTMAX_MAX;
1801 uim = UINTMAX_MAX;
1802 typedef uintptr_t my_uintptr_t;
1803 my_uintptr_t uip = UINTPTR_MAX;
1804 uip = UINTPTR_MAX;
1805 ],[glibcxx_cv_c99_stdint_tr1=yes],
1806 [glibcxx_cv_c99_stdint_tr1=no])
1807 ])
1808 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1809 AC_DEFINE(_GLIBCXX_USE_C99_STDINT_TR1, 1,
1810 [Define if C99 types in <stdint.h> should be imported in
1811 <tr1/cstdint> in namespace std::tr1.])
1812 fi
1814 # Check for the existence of <math.h> functions.
1815 AC_CACHE_CHECK([for ISO C99 support to TR1 in <math.h>],
1816 glibcxx_cv_c99_math_tr1, [
1817 AC_TRY_COMPILE([#include <math.h>],
1818 [typedef double_t my_double_t;
1819 typedef float_t my_float_t;
1820 acosh(0.0);
1821 acoshf(0.0f);
1822 acoshl(0.0l);
1823 asinh(0.0);
1824 asinhf(0.0f);
1825 asinhl(0.0l);
1826 atanh(0.0);
1827 atanhf(0.0f);
1828 atanhl(0.0l);
1829 cbrt(0.0);
1830 cbrtf(0.0f);
1831 cbrtl(0.0l);
1832 copysign(0.0, 0.0);
1833 copysignf(0.0f, 0.0f);
1834 copysignl(0.0l, 0.0l);
1835 erf(0.0);
1836 erff(0.0f);
1837 erfl(0.0l);
1838 erfc(0.0);
1839 erfcf(0.0f);
1840 erfcl(0.0l);
1841 exp2(0.0);
1842 exp2f(0.0f);
1843 exp2l(0.0l);
1844 expm1(0.0);
1845 expm1f(0.0f);
1846 expm1l(0.0l);
1847 fdim(0.0, 0.0);
1848 fdimf(0.0f, 0.0f);
1849 fdiml(0.0l, 0.0l);
1850 fma(0.0, 0.0, 0.0);
1851 fmaf(0.0f, 0.0f, 0.0f);
1852 fmal(0.0l, 0.0l, 0.0l);
1853 fmax(0.0, 0.0);
1854 fmaxf(0.0f, 0.0f);
1855 fmaxl(0.0l, 0.0l);
1856 fmin(0.0, 0.0);
1857 fminf(0.0f, 0.0f);
1858 fminl(0.0l, 0.0l);
1859 hypot(0.0, 0.0);
1860 hypotf(0.0f, 0.0f);
1861 hypotl(0.0l, 0.0l);
1862 ilogb(0.0);
1863 ilogbf(0.0f);
1864 ilogbl(0.0l);
1865 lgamma(0.0);
1866 lgammaf(0.0f);
1867 lgammal(0.0l);
1868 #ifndef __APPLE__ /* see below */
1869 llrint(0.0);
1870 llrintf(0.0f);
1871 llrintl(0.0l);
1872 llround(0.0);
1873 llroundf(0.0f);
1874 llroundl(0.0l);
1875 #endif
1876 log1p(0.0);
1877 log1pf(0.0f);
1878 log1pl(0.0l);
1879 log2(0.0);
1880 log2f(0.0f);
1881 log2l(0.0l);
1882 logb(0.0);
1883 logbf(0.0f);
1884 logbl(0.0l);
1885 lrint(0.0);
1886 lrintf(0.0f);
1887 lrintl(0.0l);
1888 lround(0.0);
1889 lroundf(0.0f);
1890 lroundl(0.0l);
1891 nan(0);
1892 nanf(0);
1893 nanl(0);
1894 nearbyint(0.0);
1895 nearbyintf(0.0f);
1896 nearbyintl(0.0l);
1897 nextafter(0.0, 0.0);
1898 nextafterf(0.0f, 0.0f);
1899 nextafterl(0.0l, 0.0l);
1900 nexttoward(0.0, 0.0);
1901 nexttowardf(0.0f, 0.0f);
1902 nexttowardl(0.0l, 0.0l);
1903 remainder(0.0, 0.0);
1904 remainderf(0.0f, 0.0f);
1905 remainderl(0.0l, 0.0l);
1906 remquo(0.0, 0.0, 0);
1907 remquof(0.0f, 0.0f, 0);
1908 remquol(0.0l, 0.0l, 0);
1909 rint(0.0);
1910 rintf(0.0f);
1911 rintl(0.0l);
1912 round(0.0);
1913 roundf(0.0f);
1914 roundl(0.0l);
1915 scalbln(0.0, 0l);
1916 scalblnf(0.0f, 0l);
1917 scalblnl(0.0l, 0l);
1918 scalbn(0.0, 0);
1919 scalbnf(0.0f, 0);
1920 scalbnl(0.0l, 0);
1921 tgamma(0.0);
1922 tgammaf(0.0f);
1923 tgammal(0.0l);
1924 trunc(0.0);
1925 truncf(0.0f);
1926 truncl(0.0l);
1927 ],[glibcxx_cv_c99_math_tr1=yes], [glibcxx_cv_c99_math_tr1=no])
1928 ])
1929 if test x"$glibcxx_cv_c99_math_tr1" = x"yes"; then
1930 AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
1931 [Define if C99 functions or macros in <math.h> should be imported
1932 in <tr1/cmath> in namespace std::tr1.])
1934 case "${target_os}" in
1935 darwin*)
1936 AC_CACHE_CHECK([for ISO C99 rounding functions in <math.h>],
1937 glibcxx_cv_c99_math_llround, [
1938 AC_TRY_COMPILE([#include <math.h>],
1939 [llrint(0.0);
1940 llrintf(0.0f);
1941 llrintl(0.0l);
1942 llround(0.0);
1943 llroundf(0.0f);
1944 llroundl(0.0l);
1945 ],
1946 [glibcxx_cv_c99_math_llround=yes],
1947 [glibcxx_cv_c99_math_llround=no])
1948 ])
1949 ;;
1950 esac
1951 if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
1952 AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
1953 [Define if C99 llrint and llround functions are missing from <math.h>.])
1954 fi
1955 fi
1957 # Check for the existence of <inttypes.h> functions (NB: doesn't make
1958 # sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1959 ac_c99_inttypes_tr1=no;
1960 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1961 AC_MSG_CHECKING([for ISO C99 support to TR1 in <inttypes.h>])
1962 AC_TRY_COMPILE([#include <inttypes.h>],
1963 [intmax_t i, numer, denom, base;
1964 const char* s;
1965 char** endptr;
1966 intmax_t ret = imaxabs(i);
1967 imaxdiv_t dret = imaxdiv(numer, denom);
1968 ret = strtoimax(s, endptr, base);
1969 uintmax_t uret = strtoumax(s, endptr, base);
1970 ],[ac_c99_inttypes_tr1=yes], [ac_c99_inttypes_tr1=no])
1971 AC_MSG_RESULT($ac_c99_inttypes_tr1)
1972 fi
1973 if test x"$ac_c99_inttypes_tr1" = x"yes"; then
1974 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_TR1, 1,
1975 [Define if C99 functions in <inttypes.h> should be imported in
1976 <tr1/cinttypes> in namespace std::tr1.])
1977 fi
1979 # Check for the existence of wchar_t <inttypes.h> functions (NB: doesn't
1980 # make sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1981 ac_c99_inttypes_wchar_t_tr1=no;
1982 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1983 AC_MSG_CHECKING([for wchar_t ISO C99 support to TR1 in <inttypes.h>])
1984 AC_TRY_COMPILE([#include <inttypes.h>],
1985 [intmax_t base;
1986 const wchar_t* s;
1987 wchar_t** endptr;
1988 intmax_t ret = wcstoimax(s, endptr, base);
1989 uintmax_t uret = wcstoumax(s, endptr, base);
1990 ],[ac_c99_inttypes_wchar_t_tr1=yes],
1991 [ac_c99_inttypes_wchar_t_tr1=no])
1992 AC_MSG_RESULT($ac_c99_inttypes_wchar_t_tr1)
1993 fi
1994 if test x"$ac_c99_inttypes_wchar_t_tr1" = x"yes"; then
1995 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1, 1,
1996 [Define if wchar_t C99 functions in <inttypes.h> should be
1997 imported in <tr1/cinttypes> in namespace std::tr1.])
1998 fi
2000 # Check for the existence of the <stdbool.h> header.
2001 AC_CHECK_HEADERS(stdbool.h)
2003 # Check for the existence of the <stdalign.h> header.
2004 AC_CHECK_HEADERS(stdalign.h)
2006 CXXFLAGS="$ac_save_CXXFLAGS"
2007 AC_LANG_RESTORE
2008 ])
2010 dnl
2011 dnl Check for uchar.h and usability.
2012 dnl
2013 AC_DEFUN([GLIBCXX_CHECK_UCHAR_H], [
2015 # Test uchar.h.
2016 AC_CHECK_HEADERS(uchar.h, ac_has_uchar_h=yes, ac_has_uchar_h=no)
2018 AC_LANG_SAVE
2019 AC_LANG_CPLUSPLUS
2020 ac_save_CXXFLAGS="$CXXFLAGS"
2021 CXXFLAGS="$CXXFLAGS -std=c++11"
2023 if test x"$ac_has_uchar_h" = x"yes"; then
2024 AC_MSG_CHECKING([for ISO C11 support for <uchar.h>])
2025 AC_TRY_COMPILE([#include <uchar.h>
2026 #ifdef __STDC_UTF_16__
2027 long i = __STDC_UTF_16__;
2028 #endif
2029 #ifdef __STDC_UTF_32__
2030 long j = __STDC_UTF_32__;
2031 #endif
2032 namespace test
2033 {
2034 using ::c16rtomb;
2035 using ::c32rtomb;
2036 using ::mbrtoc16;
2037 using ::mbrtoc32;
2038 }
2039 ],
2040 [], [ac_c11_uchar_cxx11=yes], [ac_c11_uchar_cxx11=no])
2041 AC_MSG_RESULT($ac_c11_uchar_cxx11)
2042 else
2043 ac_c11_uchar_cxx11=no
2044 fi
2045 if test x"$ac_c11_uchar_cxx11" = x"yes"; then
2046 AC_DEFINE(_GLIBCXX_USE_C11_UCHAR_CXX11, 1,
2047 [Define if C11 functions in <uchar.h> should be imported into
2048 namespace std in <cuchar>.])
2049 fi
2051 CXXFLAGS="$CXXFLAGS -fchar8_t"
2052 if test x"$ac_has_uchar_h" = x"yes"; then
2053 AC_MSG_CHECKING([for c8rtomb and mbrtoc8 in <uchar.h> with -fchar8_t])
2054 AC_TRY_COMPILE([#include <uchar.h>
2055 namespace test
2056 {
2057 using ::c8rtomb;
2058 using ::mbrtoc8;
2059 }
2060 ],
2061 [], [ac_uchar_c8rtomb_mbrtoc8_fchar8_t=yes],
2062 [ac_uchar_c8rtomb_mbrtoc8_fchar8_t=no])
2063 else
2064 ac_uchar_c8rtomb_mbrtoc8_fchar8_t=no
2065 fi
2066 AC_MSG_RESULT($ac_uchar_c8rtomb_mbrtoc8_fchar8_t)
2067 if test x"$ac_uchar_c8rtomb_mbrtoc8_fchar8_t" = x"yes"; then
2068 AC_DEFINE(_GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_FCHAR8_T, 1,
2069 [Define if c8rtomb and mbrtoc8 functions in <uchar.h> should be
2070 imported into namespace std in <cuchar> for -fchar8_t.])
2071 fi
2073 CXXFLAGS="$CXXFLAGS -std=c++20"
2074 if test x"$ac_has_uchar_h" = x"yes"; then
2075 AC_MSG_CHECKING([for c8rtomb and mbrtoc8 in <uchar.h> with -std=c++20])
2076 AC_TRY_COMPILE([#include <uchar.h>
2077 namespace test
2078 {
2079 using ::c8rtomb;
2080 using ::mbrtoc8;
2081 }
2082 ],
2083 [], [ac_uchar_c8rtomb_mbrtoc8_cxx20=yes],
2084 [ac_uchar_c8rtomb_mbrtoc8_cxx20=no])
2085 else
2086 ac_uchar_c8rtomb_mbrtoc8_cxx20=no
2087 fi
2088 AC_MSG_RESULT($ac_uchar_c8rtomb_mbrtoc8_cxx20)
2089 if test x"$ac_uchar_c8rtomb_mbrtoc8_cxx20" = x"yes"; then
2090 AC_DEFINE(_GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_CXX20, 1,
2091 [Define if c8rtomb and mbrtoc8 functions in <uchar.h> should be
2092 imported into namespace std in <cuchar> for C++20.])
2093 fi
2095 CXXFLAGS="$ac_save_CXXFLAGS"
2096 AC_LANG_RESTORE
2097 ])
2100 dnl
2101 dnl Check whether "/dev/random" and "/dev/urandom" are available for
2102 dnl class std::random_device from C++ 2011 [rand.device], and
2103 dnl random_device of "TR1" (Chapter 5.1, "Random number generation").
2104 dnl
2105 AC_DEFUN([GLIBCXX_CHECK_DEV_RANDOM], [
2107 AC_CACHE_CHECK([for "/dev/random" and "/dev/urandom" for std::random_device],
2108 glibcxx_cv_dev_random, [
2109 if test -r /dev/random && test -r /dev/urandom; then
2110 ## For MSys environment the test above is detected as false-positive
2111 ## on mingw-targets. So disable it explicitly for them.
2112 case ${target_os} in
2113 *mingw*) glibcxx_cv_dev_random=no ;;
2114 *) glibcxx_cv_dev_random=yes ;;
2115 esac
2116 else
2117 glibcxx_cv_dev_random=no;
2118 fi
2119 ])
2121 if test x"$glibcxx_cv_dev_random" = x"yes"; then
2122 AC_DEFINE(_GLIBCXX_USE_DEV_RANDOM, 1,
2123 [Define if /dev/random and /dev/urandom are available for
2124 std::random_device.])
2125 AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1, 1,
2126 [Define if /dev/random and /dev/urandom are available for
2127 the random_device of TR1 (Chapter 5.1).])
2128 fi
2130 ])
2132 dnl
2133 dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
2134 dnl
2135 AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
2137 if test "$is_hosted" = yes; then
2138 AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
2139 AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
2140 [#include <stdio.h>],
2141 [AC_MSG_ERROR([computing EOF failed])])
2142 ])
2143 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_EOF, $glibcxx_cv_stdio_eof,
2144 [Define to the value of the EOF integer constant.])
2146 AC_CACHE_CHECK([for the value of SEEK_CUR], glibcxx_cv_stdio_seek_cur, [
2147 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_cur], [[SEEK_CUR]],
2148 [#include <stdio.h>],
2149 [AC_MSG_ERROR([computing SEEK_CUR failed])])
2150 ])
2151 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_CUR, $glibcxx_cv_stdio_seek_cur,
2152 [Define to the value of the SEEK_CUR integer constant.])
2154 AC_CACHE_CHECK([for the value of SEEK_END], glibcxx_cv_stdio_seek_end, [
2155 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_end], [[SEEK_END]],
2156 [#include <stdio.h>],
2157 [AC_MSG_ERROR([computing SEEK_END failed])])
2158 ])
2159 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
2160 [Define to the value of the SEEK_END integer constant.])
2161 fi
2162 ])
2164 dnl
2165 dnl Check whether required C++ overloads are present in <stdio.h>.
2166 dnl
2167 AC_DEFUN([GLIBCXX_CHECK_STDIO_PROTO], [
2169 AC_LANG_SAVE
2170 AC_LANG_CPLUSPLUS
2171 # Use C++11 because a conforming <stdio.h> won't define gets for C++14,
2172 # and we don't need a declaration for C++14 anyway.
2173 ac_save_CXXFLAGS="$CXXFLAGS"
2174 CXXFLAGS="$CXXFLAGS -std=gnu++11"
2176 AC_CACHE_CHECK([for gets declaration], glibcxx_cv_gets, [
2177 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2178 [#include <stdio.h>
2179 namespace test
2180 {
2181 using ::gets;
2182 }
2183 ])],
2184 [glibcxx_cv_gets=yes],
2185 [glibcxx_cv_gets=no]
2186 )])
2188 if test $glibcxx_cv_gets = yes; then
2189 AC_DEFINE(HAVE_GETS, 1, [Define if gets is available in <stdio.h> before C++14.])
2190 fi
2192 CXXFLAGS="$ac_save_CXXFLAGS"
2193 AC_LANG_RESTORE
2194 ])
2196 dnl
2197 dnl Check whether required C++11 overloads for floating point and integral
2198 dnl types are present in <math.h>.
2199 dnl
2200 AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
2202 AC_LANG_SAVE
2203 AC_LANG_CPLUSPLUS
2204 ac_save_CXXFLAGS="$CXXFLAGS"
2205 CXXFLAGS="$CXXFLAGS -std=c++11"
2207 case "$host" in
2208 *-*-solaris2.*)
2209 # Solaris 12 Build 86, Solaris 11.3 SRU 3.6, and Solaris 10 Patch
2210 # 11996[67]-02 introduced the C++11 <math.h> floating point overloads.
2211 AC_CACHE_CHECK([for C++11 <math.h> floating point overloads],
2212 glibcxx_cv_math11_fp_overload, [
2213 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2214 [#include <math.h>
2215 #undef isfinite
2216 namespace std {
2217 inline bool isfinite(float __x)
2218 { return __builtin_isfinite(__x); }
2219 }
2220 ])],
2221 [glibcxx_cv_math11_fp_overload=no],
2222 [glibcxx_cv_math11_fp_overload=yes]
2223 )])
2225 # autoheader cannot handle indented templates.
2226 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_FP],
2227 [/* Define if all C++11 floating point overloads are available in <math.h>. */
2228 #if __cplusplus >= 201103L
2229 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
2230 #endif])
2232 if test $glibcxx_cv_math11_fp_overload = yes; then
2233 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_FP)
2234 fi
2236 # Solaris 12 Build 90, Solaris 11.3 SRU 5.6, and Solaris 10 Patch
2237 # 11996[67]-02 introduced the C++11 <math.h> integral type overloads.
2238 AC_CACHE_CHECK([for C++11 <math.h> integral type overloads],
2239 glibcxx_cv_math11_int_overload, [
2240 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2241 [#include <math.h>
2242 namespace std {
2243 template<typename _Tp>
2244 struct __is_integer;
2245 template<>
2246 struct __is_integer<int>
2247 {
2248 enum { __value = 1 };
2249 };
2250 }
2251 namespace __gnu_cxx {
2252 template<bool, typename>
2253 struct __enable_if;
2254 template<typename _Tp>
2255 struct __enable_if<true, _Tp>
2256 { typedef _Tp __type; };
2257 }
2258 namespace std {
2259 template<typename _Tp>
2260 constexpr typename __gnu_cxx::__enable_if
2261 <__is_integer<_Tp>::__value, double>::__type
2262 log2(_Tp __x)
2263 { return __builtin_log2(__x); }
2264 }
2265 int
2266 main (void)
2267 {
2268 int i = 1000;
2269 return std::log2(i);
2270 }
2271 ])],
2272 [glibcxx_cv_math11_int_overload=no],
2273 [glibcxx_cv_math11_int_overload=yes]
2274 )])
2276 # autoheader cannot handle indented templates.
2277 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_INT],
2278 [/* Define if all C++11 integral type overloads are available in <math.h>. */
2279 #if __cplusplus >= 201103L
2280 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
2281 #endif])
2283 if test $glibcxx_cv_math11_int_overload = yes; then
2284 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_INT)
2285 fi
2286 ;;
2287 *)
2288 # If <math.h> defines the obsolete isinf(double) and isnan(double)
2289 # functions (instead of or as well as the C99 generic macros) then we
2290 # can't define std::isinf(double) and std::isnan(double) in <cmath>
2291 # and must use the ones from <math.h> instead.
2292 AC_CACHE_CHECK([for obsolete isinf function in <math.h>],
2293 glibcxx_cv_obsolete_isinf, [
2294 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2295 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2296 #include <math.h>
2297 #undef isinf
2298 namespace std {
2299 using ::isinf;
2300 bool isinf(float);
2301 bool isinf(long double);
2302 }
2303 using std::isinf;
2304 bool b = isinf(0.0);
2305 ])],
2306 [glibcxx_cv_obsolete_isinf=yes],
2307 [glibcxx_cv_obsolete_isinf=no]
2308 )])
2309 if test $glibcxx_cv_obsolete_isinf = yes; then
2310 AC_DEFINE(HAVE_OBSOLETE_ISINF, 1,
2311 [Define if <math.h> defines obsolete isinf function.])
2312 fi
2314 AC_CACHE_CHECK([for obsolete isnan function in <math.h>],
2315 glibcxx_cv_obsolete_isnan, [
2316 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2317 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2318 #include <math.h>
2319 #undef isnan
2320 namespace std {
2321 using ::isnan;
2322 bool isnan(float);
2323 bool isnan(long double);
2324 }
2325 using std::isnan;
2326 bool b = isnan(0.0);
2327 ])],
2328 [glibcxx_cv_obsolete_isnan=yes],
2329 [glibcxx_cv_obsolete_isnan=no]
2330 )])
2331 if test $glibcxx_cv_obsolete_isnan = yes; then
2332 AC_DEFINE(HAVE_OBSOLETE_ISNAN, 1,
2333 [Define if <math.h> defines obsolete isnan function.])
2334 fi
2335 ;;
2336 esac
2338 CXXFLAGS="$ac_save_CXXFLAGS"
2339 AC_LANG_RESTORE
2340 ])
2342 dnl
2343 dnl Check for what type of C headers to use.
2344 dnl
2345 dnl --enable-cheaders= [does stuff].
2346 dnl --disable-cheaders [does not do anything, really].
2347 dnl + Usage: GLIBCXX_ENABLE_CHEADERS[(DEFAULT)]
2348 dnl Where DEFAULT is either 'c' or 'c_global' or 'c_std'.
2349 dnl
2350 dnl To use the obsolete 'c_std' headers use --enable-cheaders-obsolete as
2351 dnl well as --enable-cheaders=c_std, otherwise configure will fail.
2352 dnl
2353 AC_DEFUN([GLIBCXX_ENABLE_CHEADERS], [
2354 GLIBCXX_ENABLE(cheaders-obsolete,no,,
2355 [allow use of obsolete "C" headers for g++])
2356 GLIBCXX_ENABLE(cheaders,$1,[[[=KIND]]],
2357 [construct "C" headers for g++], [permit c|c_global|c_std])
2358 AC_MSG_NOTICE("C" header strategy set to $enable_cheaders)
2359 if test $enable_cheaders = c_std ; then
2360 AC_MSG_WARN([the --enable-cheaders=c_std configuration is obsolete, c_global should be used instead])
2361 AC_MSG_WARN([if you are unable to use c_global please report a bug or inform libstdc++@gcc.gnu.org])
2362 if test $enable_cheaders_obsolete != yes ; then
2363 AC_MSG_ERROR(use --enable-cheaders-obsolete to use c_std "C" headers)
2364 fi
2365 fi
2367 C_INCLUDE_DIR='${glibcxx_srcdir}/include/'$enable_cheaders
2369 # Allow overrides to configure.host here.
2370 if test $enable_cheaders = c_global; then
2371 c_compatibility=yes
2372 fi
2374 AC_SUBST(C_INCLUDE_DIR)
2375 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C, test $enable_cheaders = c)
2376 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_STD, test $enable_cheaders = c_std)
2377 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_GLOBAL, test $enable_cheaders = c_global)
2378 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_COMPATIBILITY, test $c_compatibility = yes)
2379 ])
2382 dnl
2383 dnl Check for which locale library to use. The choice is mapped to
2384 dnl a subdirectory of config/locale.
2385 dnl
2386 dnl Default is generic.
2387 dnl
2388 AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
2389 GLIBCXX_ENABLE(clocale,auto,[[[=MODEL]]],
2390 [use MODEL for target locale package],
2391 [permit generic|gnu|ieee_1003.1-2001|newlib|yes|no|auto])
2393 # Deal with gettext issues. Default to not using it (=no) until we detect
2394 # support for it later. Let the user turn it off via --e/d, but let that
2395 # default to on for easier handling.
2396 USE_NLS=no
2397 AC_ARG_ENABLE(nls,
2398 AC_HELP_STRING([--enable-nls],[use Native Language Support (default)]),
2399 [],
2400 [enable_nls=yes])
2402 # Either a known package, or "auto"
2403 if test $enable_clocale = no || test $enable_clocale = yes; then
2404 enable_clocale=auto
2405 fi
2406 enable_clocale_flag=$enable_clocale
2408 # Probe for locale model to use if none specified.
2409 # Default to "generic".
2410 if test $enable_clocale_flag = auto; then
2411 case ${target_os} in
2412 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2413 enable_clocale_flag=gnu
2414 ;;
2415 darwin*)
2416 enable_clocale_flag=darwin
2417 ;;
2418 vxworks*)
2419 enable_clocale_flag=vxworks
2420 ;;
2421 dragonfly* | freebsd*)
2422 enable_clocale_flag=dragonfly
2423 ;;
2424 openbsd*)
2425 enable_clocale_flag=newlib
2426 ;;
2427 *)
2428 if test x"$with_newlib" = x"yes"; then
2429 enable_clocale_flag=newlib
2430 else
2431 enable_clocale_flag=generic
2432 fi
2433 ;;
2434 esac
2435 fi
2437 # Sanity check model, and test for special functionality.
2438 if test $enable_clocale_flag = gnu; then
2439 AC_EGREP_CPP([_GLIBCXX_ok], [
2440 #include <features.h>
2441 #if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined(__UCLIBC__)
2442 _GLIBCXX_ok
2443 #endif
2444 ], enable_clocale_flag=gnu, enable_clocale_flag=generic)
2446 # Set it to scream when it hurts.
2447 ac_save_CFLAGS="$CFLAGS"
2448 CFLAGS="-Wimplicit-function-declaration -Werror"
2450 # Use strxfrm_l if available.
2451 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2452 #include <string.h>
2453 #include <locale.h>],
2454 [char s[128]; __locale_t loc; strxfrm_l(s, "C", 5, loc);],
2455 AC_DEFINE(HAVE_STRXFRM_L, 1,
2456 [Define if strxfrm_l is available in <string.h>.]),)
2458 # Use strerror_l if available.
2459 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2460 #include <string.h>
2461 #include <locale.h>],
2462 [__locale_t loc; strerror_l(5, loc);],
2463 AC_DEFINE(HAVE_STRERROR_L, 1,
2464 [Define if strerror_l is available in <string.h>.]),)
2466 CFLAGS="$ac_save_CFLAGS"
2467 fi
2469 # Perhaps use strerror_r if available, and strerror_l isn't.
2470 ac_save_CFLAGS="$CFLAGS"
2471 CFLAGS="-Wimplicit-function-declaration -Werror"
2472 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2473 #include <string.h>
2474 #include <locale.h>],
2475 [char s[128]; strerror_r(5, s, 128);],
2476 AC_DEFINE(HAVE_STRERROR_R, 1,
2477 [Define if strerror_r is available in <string.h>.]),)
2478 CFLAGS="$ac_save_CFLAGS"
2480 # Set configure bits for specified locale package
2481 AC_MSG_CHECKING([for C locale to use])
2482 case ${enable_clocale_flag} in
2483 generic)
2484 AC_MSG_RESULT(generic)
2486 CLOCALE_H=config/locale/generic/c_locale.h
2487 CLOCALE_CC=config/locale/generic/c_locale.cc
2488 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2489 CCOLLATE_CC=config/locale/generic/collate_members.cc
2490 CCTYPE_CC=config/locale/generic/ctype_members.cc
2491 CMESSAGES_H=config/locale/generic/messages_members.h
2492 CMESSAGES_CC=config/locale/generic/messages_members.cc
2493 CMONEY_CC=config/locale/generic/monetary_members.cc
2494 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2495 CTIME_H=config/locale/generic/time_members.h
2496 CTIME_CC=config/locale/generic/time_members.cc
2497 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2498 ;;
2499 darwin)
2500 AC_MSG_RESULT(darwin)
2502 CLOCALE_H=config/locale/generic/c_locale.h
2503 CLOCALE_CC=config/locale/generic/c_locale.cc
2504 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2505 CCOLLATE_CC=config/locale/generic/collate_members.cc
2506 CCTYPE_CC=config/locale/darwin/ctype_members.cc
2507 CMESSAGES_H=config/locale/generic/messages_members.h
2508 CMESSAGES_CC=config/locale/generic/messages_members.cc
2509 CMONEY_CC=config/locale/generic/monetary_members.cc
2510 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2511 CTIME_H=config/locale/generic/time_members.h
2512 CTIME_CC=config/locale/generic/time_members.cc
2513 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2514 ;;
2515 vxworks)
2516 AC_MSG_RESULT(vxworks)
2518 CLOCALE_H=config/locale/generic/c_locale.h
2519 CLOCALE_CC=config/locale/generic/c_locale.cc
2520 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2521 CCOLLATE_CC=config/locale/generic/collate_members.cc
2522 CCTYPE_CC=config/locale/vxworks/ctype_members.cc
2523 CMESSAGES_H=config/locale/generic/messages_members.h
2524 CMESSAGES_CC=config/locale/generic/messages_members.cc
2525 CMONEY_CC=config/locale/generic/monetary_members.cc
2526 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2527 CTIME_H=config/locale/generic/time_members.h
2528 CTIME_CC=config/locale/generic/time_members.cc
2529 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2530 ;;
2531 dragonfly)
2532 AC_MSG_RESULT(dragonfly or freebsd)
2534 CLOCALE_H=config/locale/dragonfly/c_locale.h
2535 CLOCALE_CC=config/locale/dragonfly/c_locale.cc
2536 CCODECVT_CC=config/locale/dragonfly/codecvt_members.cc
2537 CCOLLATE_CC=config/locale/dragonfly/collate_members.cc
2538 CCTYPE_CC=config/locale/dragonfly/ctype_members.cc
2539 CMESSAGES_H=config/locale/generic/messages_members.h
2540 CMESSAGES_CC=config/locale/generic/messages_members.cc
2541 CMONEY_CC=config/locale/dragonfly/monetary_members.cc
2542 CNUMERIC_CC=config/locale/dragonfly/numeric_members.cc
2543 CTIME_H=config/locale/dragonfly/time_members.h
2544 CTIME_CC=config/locale/dragonfly/time_members.cc
2545 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2546 ;;
2548 gnu)
2549 AC_MSG_RESULT(gnu)
2551 # Declare intention to use gettext, and add support for specific
2552 # languages.
2553 # For some reason, ALL_LINGUAS has to be before AM-GNU-GETTEXT
2554 ALL_LINGUAS="de fr"
2556 # Don't call AM-GNU-GETTEXT here. Instead, assume glibc.
2557 AC_CHECK_PROG(check_msgfmt, msgfmt, yes, no)
2558 if test x"$check_msgfmt" = x"yes" && test x"$enable_nls" = x"yes"; then
2559 USE_NLS=yes
2560 fi
2561 # Export the build objects.
2562 for ling in $ALL_LINGUAS; do \
2563 glibcxx_MOFILES="$glibcxx_MOFILES $ling.mo"; \
2564 glibcxx_POFILES="$glibcxx_POFILES $ling.po"; \
2565 done
2566 AC_SUBST(glibcxx_MOFILES)
2567 AC_SUBST(glibcxx_POFILES)
2569 CLOCALE_H=config/locale/gnu/c_locale.h
2570 CLOCALE_CC=config/locale/gnu/c_locale.cc
2571 CCODECVT_CC=config/locale/gnu/codecvt_members.cc
2572 CCOLLATE_CC=config/locale/gnu/collate_members.cc
2573 CCTYPE_CC=config/locale/gnu/ctype_members.cc
2574 CMESSAGES_H=config/locale/gnu/messages_members.h
2575 CMESSAGES_CC=config/locale/gnu/messages_members.cc
2576 CMONEY_CC=config/locale/gnu/monetary_members.cc
2577 CNUMERIC_CC=config/locale/gnu/numeric_members.cc
2578 CTIME_H=config/locale/gnu/time_members.h
2579 CTIME_CC=config/locale/gnu/time_members.cc
2580 CLOCALE_INTERNAL_H=config/locale/gnu/c++locale_internal.h
2581 ;;
2582 ieee_1003.1-2001)
2583 AC_MSG_RESULT(IEEE 1003.1)
2585 CLOCALE_H=config/locale/ieee_1003.1-2001/c_locale.h
2586 CLOCALE_CC=config/locale/ieee_1003.1-2001/c_locale.cc
2587 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2588 CCOLLATE_CC=config/locale/generic/collate_members.cc
2589 CCTYPE_CC=config/locale/generic/ctype_members.cc
2590 CMESSAGES_H=config/locale/ieee_1003.1-2001/messages_members.h
2591 CMESSAGES_CC=config/locale/ieee_1003.1-2001/messages_members.cc
2592 CMONEY_CC=config/locale/generic/monetary_members.cc
2593 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2594 CTIME_H=config/locale/generic/time_members.h
2595 CTIME_CC=config/locale/generic/time_members.cc
2596 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2597 ;;
2598 newlib)
2599 AC_MSG_RESULT(newlib)
2601 CLOCALE_H=config/locale/generic/c_locale.h
2602 CLOCALE_CC=config/locale/generic/c_locale.cc
2603 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2604 CCOLLATE_CC=config/locale/generic/collate_members.cc
2605 CCTYPE_CC=config/locale/newlib/ctype_members.cc
2606 CMESSAGES_H=config/locale/generic/messages_members.h
2607 CMESSAGES_CC=config/locale/generic/messages_members.cc
2608 CMONEY_CC=config/locale/generic/monetary_members.cc
2609 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2610 CTIME_H=config/locale/generic/time_members.h
2611 CTIME_CC=config/locale/generic/time_members.cc
2612 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2613 ;;
2614 esac
2616 # This is where the testsuite looks for locale catalogs, using the
2617 # -DLOCALEDIR define during testsuite compilation.
2618 glibcxx_localedir=${glibcxx_builddir}/po/share/locale
2619 AC_SUBST(glibcxx_localedir)
2621 # A standalone libintl (e.g., GNU libintl) may be in use.
2622 if test $USE_NLS = yes; then
2623 AC_CHECK_HEADERS([libintl.h], [], USE_NLS=no)
2624 AC_SEARCH_LIBS(gettext, intl, [], USE_NLS=no)
2625 fi
2626 if test $USE_NLS = yes; then
2627 AC_DEFINE(_GLIBCXX_USE_NLS, 1,
2628 [Define if NLS translations are to be used.])
2629 fi
2631 AC_SUBST(USE_NLS)
2632 AC_SUBST(CLOCALE_H)
2633 AC_SUBST(CMESSAGES_H)
2634 AC_SUBST(CCODECVT_CC)
2635 AC_SUBST(CCOLLATE_CC)
2636 AC_SUBST(CCTYPE_CC)
2637 AC_SUBST(CMESSAGES_CC)
2638 AC_SUBST(CMONEY_CC)
2639 AC_SUBST(CNUMERIC_CC)
2640 AC_SUBST(CTIME_H)
2641 AC_SUBST(CTIME_CC)
2642 AC_SUBST(CLOCALE_CC)
2643 AC_SUBST(CLOCALE_INTERNAL_H)
2644 ])
2647 dnl
2648 dnl Check for which std::allocator base class to use. The choice is
2649 dnl mapped from a subdirectory of include/ext.
2650 dnl
2651 dnl Default is new.
2652 dnl
2653 AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
2654 AC_MSG_CHECKING([for std::allocator base class])
2655 GLIBCXX_ENABLE(libstdcxx-allocator,auto,[[[=KIND]]],
2656 [use KIND for target std::allocator base],
2657 [permit new|malloc|yes|no|auto])
2659 # If they didn't use this option switch, or if they specified --enable
2660 # with no specific model, we'll have to look for one. If they
2661 # specified --disable (???), do likewise.
2662 if test $enable_libstdcxx_allocator = no ||
2663 test $enable_libstdcxx_allocator = yes;
2664 then
2665 enable_libstdcxx_allocator=auto
2666 fi
2668 # Either a known package, or "auto". Auto implies the default choice
2669 # for a particular platform.
2670 enable_libstdcxx_allocator_flag=$enable_libstdcxx_allocator
2672 # Probe for host-specific support if no specific model is specified.
2673 # Default to "new".
2674 if test $enable_libstdcxx_allocator_flag = auto; then
2675 case ${target_os} in
2676 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2677 enable_libstdcxx_allocator_flag=new
2678 ;;
2679 *)
2680 enable_libstdcxx_allocator_flag=new
2681 ;;
2682 esac
2683 fi
2684 AC_MSG_RESULT($enable_libstdcxx_allocator_flag)
2687 # Set configure bits for specified locale package
2688 case ${enable_libstdcxx_allocator_flag} in
2689 malloc)
2690 ALLOCATOR_H=config/allocator/malloc_allocator_base.h
2691 ALLOCATOR_NAME=__gnu_cxx::malloc_allocator
2692 ;;
2693 new)
2694 ALLOCATOR_H=config/allocator/new_allocator_base.h
2695 ALLOCATOR_NAME=__gnu_cxx::new_allocator
2696 ;;
2697 esac
2699 GLIBCXX_CONDITIONAL(ENABLE_ALLOCATOR_NEW,
2700 test $enable_libstdcxx_allocator_flag = new)
2701 AC_SUBST(ALLOCATOR_H)
2702 AC_SUBST(ALLOCATOR_NAME)
2703 ])
2706 dnl
2707 dnl Check for whether the Boost-derived checks should be turned on.
2708 dnl
2709 dnl --enable-concept-checks turns them on.
2710 dnl --disable-concept-checks leaves them off.
2711 dnl + Usage: GLIBCXX_ENABLE_CONCEPT_CHECKS[(DEFAULT)]
2712 dnl Where DEFAULT is either `yes' or `no'.
2713 dnl
2714 AC_DEFUN([GLIBCXX_ENABLE_CONCEPT_CHECKS], [
2715 GLIBCXX_ENABLE(concept-checks,$1,,[use Boost-derived template checks])
2716 if test $enable_concept_checks = yes; then
2717 AC_DEFINE(_GLIBCXX_CONCEPT_CHECKS, 1,
2718 [Define to use concept checking code from the boost libraries.])
2719 fi
2720 ])
2722 dnl
2723 dnl Use extern templates.
2724 dnl
2725 dnl --enable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 1
2726 dnl --disable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 0
2728 dnl + Usage: GLIBCXX_ENABLE_TEMPLATE[(DEFAULT)]
2729 dnl Where DEFAULT is `yes' or `no'.
2730 dnl
2731 AC_DEFUN([GLIBCXX_ENABLE_EXTERN_TEMPLATE], [
2733 GLIBCXX_ENABLE(extern-template,$1,,[enable extern template])
2735 AC_MSG_CHECKING([for extern template support])
2736 AC_MSG_RESULT([$enable_extern_template])
2738 GLIBCXX_CONDITIONAL(ENABLE_EXTERN_TEMPLATE, test $enable_extern_template = yes)
2739 ])
2741 dnl
2742 dnl Use vtable verification.
2743 dnl
2744 dnl --enable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 1
2745 dnl --disable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 0
2747 dnl + Usage: GLIBCXX_ENABLE_VTABLE_VERIFY[(DEFAULT)]
2748 dnl Where DEFAULT is `yes' or `no'.
2749 dnl
2750 AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY], [
2752 GLIBCXX_ENABLE(vtable-verify,$1,,[enable vtable verify])
2754 AC_MSG_CHECKING([for vtable verify support])
2755 AC_MSG_RESULT([$enable_vtable_verify])
2757 vtv_cygmin=no
2758 if test $enable_vtable_verify = yes; then
2759 case ${target_os} in
2760 cygwin*|mingw32*)
2761 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2762 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2763 vtv_cygmin=yes
2764 ;;
2765 darwin*)
2766 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u,_vtable_map_vars_start -Wl,-u,_vtable_map_vars_end"
2767 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-rpath,${toplevel_builddir}/libvtv/.libs"
2768 ;;
2769 solaris2*)
2770 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2771 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-R -Wl,${toplevel_builddir}/libvtv/.libs"
2772 ;;
2773 *)
2774 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2775 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2776 ;;
2777 esac
2778 VTV_PCH_CXXFLAGS="-fvtable-verify=std"
2779 else
2780 VTV_CXXFLAGS=
2781 VTV_PCH_CXXFLAGS=
2782 VTV_CXXLINKFLAGS=
2783 fi
2785 AC_SUBST(VTV_CXXFLAGS)
2786 AC_SUBST(VTV_PCH_CXXFLAGS)
2787 AC_SUBST(VTV_CXXLINKFLAGS)
2788 AM_CONDITIONAL(VTV_CYGMIN, test x$vtv_cygmin = xyes)
2789 GLIBCXX_CONDITIONAL(ENABLE_VTABLE_VERIFY, test $enable_vtable_verify = yes)
2790 ])
2792 dnl
2793 dnl Check for parallel mode pre-requisites, including OpenMP support.
2794 dnl
2795 dnl + Usage: GLIBCXX_ENABLE_PARALLEL
2796 dnl
2797 AC_DEFUN([GLIBCXX_ENABLE_PARALLEL], [
2799 enable_parallel=no;
2801 # See if configured libgomp/omp.h exists. (libgomp may be in
2802 # noconfigdirs but not explicitly disabled.)
2803 if echo " ${TARGET_CONFIGDIRS} " | grep " libgomp " > /dev/null 2>&1 ; then
2804 enable_parallel=yes;
2805 else
2806 AC_MSG_NOTICE([target-libgomp not built])
2807 fi
2809 AC_MSG_CHECKING([for parallel mode support])
2810 AC_MSG_RESULT([$enable_parallel])
2811 ])
2814 dnl
2815 dnl Check for which I/O library to use: stdio and POSIX, or pure stdio.
2816 dnl
2817 dnl Default is stdio_posix.
2818 dnl
2819 AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
2820 AC_MSG_CHECKING([for underlying I/O to use])
2821 GLIBCXX_ENABLE(cstdio,stdio,[[[=PACKAGE]]],
2822 [use target-specific I/O package], [permit stdio|stdio_posix|stdio_pure])
2824 # The only available I/O model is based on stdio, via basic_file_stdio.
2825 # The default "stdio" is actually "stdio + POSIX" because it uses fdopen(3)
2826 # to get a file descriptor and then uses read(3) and write(3) with it.
2827 # The "stdio_pure" model doesn't use fdopen and only uses FILE* for I/O.
2828 case ${enable_cstdio} in
2829 stdio*)
2830 CSTDIO_H=config/io/c_io_stdio.h
2831 BASIC_FILE_H=config/io/basic_file_stdio.h
2832 BASIC_FILE_CC=config/io/basic_file_stdio.cc
2834 if test "x$enable_cstdio" = "xstdio_pure" ; then
2835 AC_MSG_RESULT([stdio (without POSIX read/write)])
2836 AC_DEFINE(_GLIBCXX_USE_STDIO_PURE, 1,
2837 [Define to restrict std::__basic_file<> to stdio APIs.])
2838 else
2839 AC_MSG_RESULT([stdio (with POSIX read/write)])
2840 fi
2841 ;;
2842 esac
2844 AC_SUBST(CSTDIO_H)
2845 AC_SUBST(BASIC_FILE_H)
2846 AC_SUBST(BASIC_FILE_CC)
2847 ])
2850 dnl
2851 dnl Check for "unusual" flags to pass to the compiler while building.
2852 dnl
2853 dnl --enable-cxx-flags='-foo -bar -baz' is a general method for passing
2854 dnl experimental flags such as -fpch, -fIMI, -Dfloat=char, etc.
2855 dnl --disable-cxx-flags passes nothing.
2856 dnl + See http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00131.html
2857 dnl http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00284.html
2858 dnl http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00035.html
2859 dnl + Usage: GLIBCXX_ENABLE_CXX_FLAGS(default flags)
2860 dnl If "default flags" is an empty string, the effect is the same
2861 dnl as --disable or --enable=no.
2862 dnl
2863 AC_DEFUN([GLIBCXX_ENABLE_CXX_FLAGS], [dnl
2864 AC_MSG_CHECKING([for extra compiler flags for building])
2865 GLIBCXX_ENABLE(cxx-flags,$1,[=FLAGS],
2866 [pass compiler FLAGS when building library],
2867 [case "x$enable_cxx_flags" in
2868 xno | x) enable_cxx_flags= ;;
2869 x-*) ;;
2870 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2871 esac])
2873 # Run through flags (either default or command-line) and set anything
2874 # extra (e.g., #defines) that must accompany particular g++ options.
2875 if test -n "$enable_cxx_flags"; then
2876 for f in $enable_cxx_flags; do
2877 case "$f" in
2878 -fhonor-std) ;;
2879 -*) ;;
2880 *) # and we're trying to pass /what/ exactly?
2881 AC_MSG_ERROR([compiler flags start with a -]) ;;
2882 esac
2883 done
2884 fi
2886 EXTRA_CXX_FLAGS="$enable_cxx_flags"
2887 AC_MSG_RESULT($EXTRA_CXX_FLAGS)
2888 AC_SUBST(EXTRA_CXX_FLAGS)
2889 ])
2892 dnl
2893 dnl Check to see if debugging libraries are to be built.
2894 dnl
2895 dnl --enable-libstdcxx-debug
2896 dnl builds a separate set of debugging libraries in addition to the
2897 dnl normal (shared, static) libstdc++ binaries.
2898 dnl
2899 dnl --disable-libstdcxx-debug
2900 dnl builds only one (non-debug) version of libstdc++.
2901 dnl
2902 dnl --enable-libstdcxx-debug-flags=FLAGS
2903 dnl iff --enable-debug == yes, then use FLAGS to build the debug library.
2904 dnl
2905 dnl + Usage: GLIBCXX_ENABLE_DEBUG[(DEFAULT)]
2906 dnl Where DEFAULT is either `yes' or `no'.
2907 dnl
2908 AC_DEFUN([GLIBCXX_ENABLE_DEBUG], [
2909 AC_MSG_CHECKING([for additional debug build])
2910 skip_debug_build=
2911 GLIBCXX_ENABLE(libstdcxx-debug,$1,,[build extra debug library])
2912 if test x$enable_libstdcxx_debug = xyes; then
2913 if test -f $toplevel_builddir/../stage_final \
2914 && test -f $toplevel_builddir/../stage_current; then
2915 stage_final=`cat $toplevel_builddir/../stage_final`
2916 stage_current=`cat $toplevel_builddir/../stage_current`
2917 if test x$stage_current != x$stage_final ; then
2918 skip_debug_build=" (skipped for bootstrap stage $stage_current)"
2919 enable_libstdcxx_debug=no
2920 fi
2921 fi
2922 fi
2923 AC_MSG_RESULT($enable_libstdcxx_debug$skip_debug_build)
2924 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_DEBUG, test $enable_libstdcxx_debug = yes)
2925 ])
2928 dnl
2929 dnl Check for explicit debug flags.
2930 dnl
2931 dnl --enable-libstdcxx-debug-flags='-O1'
2932 dnl is a general method for passing flags to be used when
2933 dnl building debug libraries with --enable-libstdcxx-debug.
2934 dnl
2935 dnl --disable-libstdcxx-debug-flags does nothing.
2936 dnl + Usage: GLIBCXX_ENABLE_DEBUG_FLAGS(default flags)
2937 dnl If "default flags" is an empty string, the effect is the same
2938 dnl as --disable or --enable=no.
2939 dnl
2940 AC_DEFUN([GLIBCXX_ENABLE_DEBUG_FLAGS], [
2941 GLIBCXX_ENABLE(libstdcxx-debug-flags,[$1],[=FLAGS],
2942 [pass compiler FLAGS when building debug library],
2943 [case "x$enable_libstdcxx_debug_flags" in
2944 xno | x) enable_libstdcxx_debug_flags= ;;
2945 x-*) ;;
2946 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2947 esac])
2949 # Option parsed, now set things appropriately
2950 DEBUG_FLAGS="$enable_libstdcxx_debug_flags"
2951 AC_SUBST(DEBUG_FLAGS)
2953 AC_MSG_NOTICE([Debug build flags set to $DEBUG_FLAGS])
2954 ])
2957 dnl
2958 dnl Check if the user only wants a freestanding library implementation.
2959 dnl
2960 dnl --disable-hosted-libstdcxx will turn off most of the library build,
2961 dnl installing only the headers required by [17.4.1.3] and the language
2962 dnl support library. More than that will be built (to keep the Makefiles
2963 dnl conveniently clean), but not installed.
2964 dnl
2965 dnl Sets:
2966 dnl is_hosted (yes/no)
2967 dnl
2968 dnl Defines:
2969 dnl _GLIBCXX_HOSTED (always defined, either to 1 or 0)
2970 dnl
2971 AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
2972 AC_ARG_ENABLE([hosted-libstdcxx],
2973 AC_HELP_STRING([--disable-hosted-libstdcxx],
2974 [only build freestanding C++ runtime support]),,
2975 [case "$host" in
2976 arm*-*-symbianelf*)
2977 enable_hosted_libstdcxx=no
2978 ;;
2979 *)
2980 enable_hosted_libstdcxx=yes
2981 ;;
2982 esac])
2983 freestanding_flags=
2984 if test "$enable_hosted_libstdcxx" = no; then
2985 AC_MSG_NOTICE([Only freestanding libraries will be built])
2986 is_hosted=no
2987 hosted_define=0
2988 enable_abi_check=no
2989 enable_libstdcxx_pch=no
2990 if test "x$with_headers" = xno; then
2991 freestanding_flags="-ffreestanding"
2992 fi
2993 else
2994 is_hosted=yes
2995 hosted_define=1
2996 fi
2997 GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
2998 AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
2999 [Define to 1 if a full hosted library is built, or 0 if freestanding.])
3000 FREESTANDING_FLAGS="$freestanding_flags"
3001 AC_SUBST(FREESTANDING_FLAGS)
3002 ])
3005 dnl
3006 dnl Check if the user wants a non-verbose library implementation.
3007 dnl
3008 dnl --disable-libstdcxx-verbose will turn off descriptive messages to
3009 dnl standard error on termination.
3010 dnl
3011 dnl Defines:
3012 dnl _GLIBCXX_VERBOSE (always defined, either to 1 or 0)
3013 dnl
3014 AC_DEFUN([GLIBCXX_ENABLE_VERBOSE], [
3015 AC_ARG_ENABLE([libstdcxx-verbose],
3016 AC_HELP_STRING([--disable-libstdcxx-verbose],
3017 [disable termination messages to standard error]),,
3018 [enable_libstdcxx_verbose=yes])
3019 if test x"$enable_libstdcxx_verbose" = xyes; then
3020 verbose_define=1
3021 else
3022 AC_MSG_NOTICE([verbose termination messages are disabled])
3023 verbose_define=0
3024 fi
3025 AC_DEFINE_UNQUOTED(_GLIBCXX_VERBOSE, $verbose_define,
3026 [Define to 1 if a verbose library is built, or 0 otherwise.])
3027 ])
3030 dnl
3031 dnl Check for template specializations for the 'long long' type.
3032 dnl The result determines only whether 'long long' I/O is enabled; things
3033 dnl like numeric_limits<> specializations are always available.
3034 dnl
3035 dnl --enable-long-long defines _GLIBCXX_USE_LONG_LONG
3036 dnl --disable-long-long leaves _GLIBCXX_USE_LONG_LONG undefined
3037 dnl + Usage: GLIBCXX_ENABLE_LONG_LONG[(DEFAULT)]
3038 dnl Where DEFAULT is either `yes' or `no'.
3039 dnl
3040 AC_DEFUN([GLIBCXX_ENABLE_LONG_LONG], [
3041 GLIBCXX_ENABLE(long-long,$1,,[enable template specializations for 'long long'])
3042 if test $enable_long_long = yes; then
3043 AC_DEFINE(_GLIBCXX_USE_LONG_LONG, 1,
3044 [Define if code specialized for long long should be used.])
3045 fi
3046 AC_MSG_CHECKING([for enabled long long specializations])
3047 AC_MSG_RESULT([$enable_long_long])
3048 ])
3051 dnl
3052 dnl Check for decimal floating point.
3053 dnl See:
3054 dnl http://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float
3055 dnl
3056 dnl This checks to see if the host supports decimal floating point types.
3057 dnl
3058 dnl Defines:
3059 dnl _GLIBCXX_USE_DECIMAL_FLOAT
3060 dnl
3061 AC_DEFUN([GLIBCXX_ENABLE_DECIMAL_FLOAT], [
3063 # Fake what AC_TRY_COMPILE does, without linking as this is
3064 # unnecessary for this test.
3066 cat > conftest.$ac_ext << EOF
3067 [#]line __oline__ "configure"
3068 int main()
3069 {
3070 _Decimal32 d1;
3071 _Decimal64 d2;
3072 _Decimal128 d3;
3073 return 0;
3074 }
3075 EOF
3077 AC_MSG_CHECKING([for ISO/IEC TR 24733 ])
3078 if AC_TRY_EVAL(ac_compile); then
3079 AC_DEFINE(_GLIBCXX_USE_DECIMAL_FLOAT, 1,
3080 [Define if ISO/IEC TR 24733 decimal floating point types are supported on this host.])
3081 enable_dfp=yes
3082 else
3083 enable_dfp=no
3084 fi
3085 AC_MSG_RESULT($enable_dfp)
3086 rm -f conftest*
3087 ])
3089 dnl
3090 dnl Check for GNU 128-bit floating point type.
3091 dnl
3092 dnl Note: also checks that the type isn't a standard types.
3093 dnl
3094 dnl Defines:
3095 dnl ENABLE_FLOAT128
3096 dnl
3097 AC_DEFUN([GLIBCXX_ENABLE_FLOAT128], [
3099 AC_LANG_SAVE
3100 AC_LANG_CPLUSPLUS
3102 # Fake what AC_TRY_COMPILE does, without linking as this is
3103 # unnecessary for this test.
3105 cat > conftest.$ac_ext << EOF
3106 [#]line __oline__ "configure"
3107 template<typename T1, typename T2>
3108 struct same
3109 { typedef T2 type; };
3111 template<typename T>
3112 struct same<T, T>;
3114 int main()
3115 {
3116 typename same<double, __float128>::type f1;
3117 typename same<long double, __float128>::type f2;
3118 }
3119 EOF
3121 AC_MSG_CHECKING([for __float128])
3122 if AC_TRY_EVAL(ac_compile); then
3123 enable_float128=yes
3124 else
3125 enable_float128=no
3126 fi
3127 AC_MSG_RESULT($enable_float128)
3128 GLIBCXX_CONDITIONAL(ENABLE_FLOAT128, test $enable_float128 = yes)
3129 rm -f conftest*
3131 AC_LANG_RESTORE
3132 ])
3134 dnl
3135 dnl Check for template specializations for the 'wchar_t' type.
3136 dnl
3137 dnl --enable-wchar_t defines _GLIBCXX_USE_WCHAR_T
3138 dnl --disable-wchar_t leaves _GLIBCXX_USE_WCHAR_T undefined
3139 dnl + Usage: GLIBCXX_ENABLE_WCHAR_T[(DEFAULT)]
3140 dnl Where DEFAULT is either `yes' or `no'.
3141 dnl
3142 dnl Necessary support must also be present.
3143 dnl
3144 AC_DEFUN([GLIBCXX_ENABLE_WCHAR_T], [
3145 GLIBCXX_ENABLE(wchar_t,$1,,[enable template specializations for 'wchar_t'])
3147 # Test wchar.h for mbstate_t, which is needed for char_traits and fpos.
3148 AC_CHECK_HEADERS(wchar.h, ac_has_wchar_h=yes, ac_has_wchar_h=no)
3149 AC_MSG_CHECKING([for mbstate_t])
3150 AC_TRY_COMPILE([#include <wchar.h>],
3151 [mbstate_t teststate;],
3152 have_mbstate_t=yes, have_mbstate_t=no)
3153 AC_MSG_RESULT($have_mbstate_t)
3154 if test x"$have_mbstate_t" = xyes; then
3155 AC_DEFINE(HAVE_MBSTATE_T,1,[Define if mbstate_t exists in wchar.h.])
3156 fi
3158 # Test it always, for use in GLIBCXX_ENABLE_C99, together with
3159 # ac_has_wchar_h.
3160 AC_CHECK_HEADERS(wctype.h, ac_has_wctype_h=yes, ac_has_wctype_h=no)
3162 if test x"$enable_wchar_t" = x"yes"; then
3164 AC_LANG_SAVE
3165 AC_LANG_CPLUSPLUS
3167 if test x"$ac_has_wchar_h" = xyes &&
3168 test x"$ac_has_wctype_h" = xyes; then
3169 AC_TRY_COMPILE([#include <wchar.h>
3170 #include <stddef.h>
3171 wint_t i;
3172 long l = WEOF;
3173 long j = WCHAR_MIN;
3174 long k = WCHAR_MAX;
3175 namespace test
3176 {
3177 using ::btowc;
3178 using ::fgetwc;
3179 using ::fgetws;
3180 using ::fputwc;
3181 using ::fputws;
3182 using ::fwide;
3183 using ::fwprintf;
3184 using ::fwscanf;
3185 using ::getwc;
3186 using ::getwchar;
3187 using ::mbrlen;
3188 using ::mbrtowc;
3189 using ::mbsinit;
3190 using ::mbsrtowcs;
3191 using ::putwc;
3192 using ::putwchar;
3193 using ::swprintf;
3194 using ::swscanf;
3195 using ::ungetwc;
3196 using ::vfwprintf;
3197 using ::vswprintf;
3198 using ::vwprintf;
3199 using ::wcrtomb;
3200 using ::wcscat;
3201 using ::wcschr;
3202 using ::wcscmp;
3203 using ::wcscoll;
3204 using ::wcscpy;
3205 using ::wcscspn;
3206 using ::wcsftime;
3207 using ::wcslen;
3208 using ::wcsncat;
3209 using ::wcsncmp;
3210 using ::wcsncpy;
3211 using ::wcspbrk;
3212 using ::wcsrchr;
3213 using ::wcsrtombs;
3214 using ::wcsspn;
3215 using ::wcsstr;
3216 using ::wcstod;
3217 using ::wcstok;
3218 using ::wcstol;
3219 using ::wcstoul;
3220 using ::wcsxfrm;
3221 using ::wctob;
3222 using ::wmemchr;
3223 using ::wmemcmp;
3224 using ::wmemcpy;
3225 using ::wmemmove;
3226 using ::wmemset;
3227 using ::wprintf;
3228 using ::wscanf;
3229 }
3230 ],[],[], [enable_wchar_t=no])
3231 else
3232 enable_wchar_t=no
3233 fi
3235 AC_LANG_RESTORE
3236 fi
3238 if test x"$enable_wchar_t" = x"yes"; then
3239 AC_DEFINE(_GLIBCXX_USE_WCHAR_T, 1,
3240 [Define if code specialized for wchar_t should be used.])
3241 fi
3243 AC_MSG_CHECKING([for enabled wchar_t specializations])
3244 AC_MSG_RESULT([$enable_wchar_t])
3245 ])
3248 dnl
3249 dnl Check to see if building and using a C++ precompiled header can be done.
3250 dnl
3251 dnl --enable-libstdcxx-pch=yes
3252 dnl default, this shows intent to use stdc++.h.gch If it looks like it
3253 dnl may work, after some light-hearted attempts to puzzle out compiler
3254 dnl support, flip bits on in include/Makefile.am
3255 dnl
3256 dnl --disable-libstdcxx-pch
3257 dnl turns off attempts to use or build stdc++.h.gch.
3258 dnl
3259 dnl Substs:
3260 dnl glibcxx_PCHFLAGS
3261 dnl
3262 AC_DEFUN([GLIBCXX_ENABLE_PCH], [
3263 GLIBCXX_ENABLE(libstdcxx-pch,$1,,[build pre-compiled libstdc++ headers])
3264 if test $enable_libstdcxx_pch = yes; then
3265 AC_CACHE_CHECK([for compiler with PCH support],
3266 [glibcxx_cv_prog_CXX_pch],
3267 [ac_save_CXXFLAGS="$CXXFLAGS"
3268 CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
3269 AC_LANG_SAVE
3270 AC_LANG_CPLUSPLUS
3271 echo '#include <math.h>' > conftest.h
3272 if $CXX $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
3273 -o conftest.h.gch 1>&5 2>&1 &&
3274 echo '#error "pch failed"' > conftest.h &&
3275 echo '#include "conftest.h"' > conftest.cc &&
3276 $CXX -c $CXXFLAGS $CPPFLAGS conftest.cc 1>&5 2>&1 ;
3277 then
3278 glibcxx_cv_prog_CXX_pch=yes
3279 else
3280 glibcxx_cv_prog_CXX_pch=no
3281 fi
3282 rm -f conftest*
3283 CXXFLAGS=$ac_save_CXXFLAGS
3284 AC_LANG_RESTORE
3285 ])
3286 enable_libstdcxx_pch=$glibcxx_cv_prog_CXX_pch
3287 fi
3289 AC_MSG_CHECKING([for enabled PCH])
3290 AC_MSG_RESULT([$enable_libstdcxx_pch])
3292 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_PCH, test $enable_libstdcxx_pch = yes)
3293 if test $enable_libstdcxx_pch = yes; then
3294 glibcxx_PCHFLAGS="-include bits/stdc++.h"
3295 else
3296 glibcxx_PCHFLAGS=""
3297 fi
3298 AC_SUBST(glibcxx_PCHFLAGS)
3299 ])
3302 dnl
3303 dnl Check for atomic builtins.
3304 dnl See:
3305 dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
3306 dnl
3307 dnl This checks to see if the host supports the compiler-generated
3308 dnl builtins for atomic operations for various integral sizes. Note, this
3309 dnl is intended to be an all-or-nothing switch, so all the atomic operations
3310 dnl that are used should be checked.
3311 dnl
3312 dnl Note:
3313 dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
3314 dnl
3315 AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
3316 AC_LANG_SAVE
3317 AC_LANG_CPLUSPLUS
3318 old_CXXFLAGS="$CXXFLAGS"
3320 # Do link tests if possible, instead asm tests, limited to some platforms
3321 # see discussion in PR target/40134, PR libstdc++/40133 and the thread
3322 # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
3323 atomic_builtins_link_tests=no
3324 if test x$gcc_no_link != xyes; then
3325 # Can do link tests. Limit to some tested platforms
3326 case "$host" in
3327 *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
3328 atomic_builtins_link_tests=yes
3329 ;;
3330 esac
3331 fi
3333 if test x$atomic_builtins_link_tests = xyes; then
3335 # Do link tests.
3337 CXXFLAGS="$CXXFLAGS -fno-exceptions"
3339 AC_CACHE_CHECK([for atomic builtins for bool],
3340 glibcxx_cv_atomic_bool, [
3341 AC_TRY_LINK(
3342 [ ],
3343 [typedef bool atomic_type;
3344 atomic_type c1;
3345 atomic_type c2;
3346 atomic_type c3(0);
3347 // N.B. __atomic_fetch_add is not supported for bool.
3348 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3349 __ATOMIC_RELAXED);
3350 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3351 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3352 ],
3353 [glibcxx_cv_atomic_bool=yes],
3354 [glibcxx_cv_atomic_bool=no])
3355 ])
3357 AC_CACHE_CHECK([for atomic builtins for short],
3358 glibcxx_cv_atomic_short, [
3359 AC_TRY_LINK(
3360 [ ],
3361 [typedef short atomic_type;
3362 atomic_type c1;
3363 atomic_type c2;
3364 atomic_type c3(0);
3365 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3366 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3367 __ATOMIC_RELAXED);
3368 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3369 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3370 ],
3371 [glibcxx_cv_atomic_short=yes],
3372 [glibcxx_cv_atomic_short=no])
3373 ])
3375 AC_CACHE_CHECK([for atomic builtins for int],
3376 glibcxx_cv_atomic_int, [
3377 AC_TRY_LINK(
3378 [ ],
3379 [typedef int atomic_type;
3380 atomic_type c1;
3381 atomic_type c2;
3382 atomic_type c3(0);
3383 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3384 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3385 __ATOMIC_RELAXED);
3386 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3387 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3388 ],
3389 [glibcxx_cv_atomic_int=yes],
3390 [glibcxx_cv_atomic_int=no])
3391 ])
3393 AC_CACHE_CHECK([for atomic builtins for long long],
3394 glibcxx_cv_atomic_long_long, [
3395 AC_TRY_LINK(
3396 [ ],
3397 [typedef long long atomic_type;
3398 atomic_type c1;
3399 atomic_type c2;
3400 atomic_type c3(0);
3401 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3402 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3403 __ATOMIC_RELAXED);
3404 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3405 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3406 ],
3407 [glibcxx_cv_atomic_long_long=yes],
3408 [glibcxx_cv_atomic_long_long=no])
3409 ])
3411 else
3413 # Do asm tests.
3415 # Compile unoptimized.
3416 CXXFLAGS='-O0 -S'
3418 # Fake what AC_TRY_COMPILE does.
3420 cat > conftest.$ac_ext << EOF
3421 [#]line __oline__ "configure"
3422 int main()
3423 {
3424 typedef bool atomic_type;
3425 atomic_type c1;
3426 atomic_type c2;
3427 atomic_type c3(0);
3428 // N.B. __atomic_fetch_add is not supported for bool.
3429 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3430 __ATOMIC_RELAXED);
3431 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3432 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3434 return 0;
3435 }
3436 EOF
3438 AC_MSG_CHECKING([for atomic builtins for bool])
3439 if AC_TRY_EVAL(ac_compile); then
3440 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3441 glibcxx_cv_atomic_bool=no
3442 else
3443 glibcxx_cv_atomic_bool=yes
3444 fi
3445 fi
3446 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3447 rm -f conftest*
3449 cat > conftest.$ac_ext << EOF
3450 [#]line __oline__ "configure"
3451 int main()
3452 {
3453 typedef short atomic_type;
3454 atomic_type c1;
3455 atomic_type c2;
3456 atomic_type c3(0);
3457 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3458 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3459 __ATOMIC_RELAXED);
3460 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3461 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3463 return 0;
3464 }
3465 EOF
3467 AC_MSG_CHECKING([for atomic builtins for short])
3468 if AC_TRY_EVAL(ac_compile); then
3469 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3470 glibcxx_cv_atomic_short=no
3471 else
3472 glibcxx_cv_atomic_short=yes
3473 fi
3474 fi
3475 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3476 rm -f conftest*
3478 cat > conftest.$ac_ext << EOF
3479 [#]line __oline__ "configure"
3480 int main()
3481 {
3482 // NB: _Atomic_word not necessarily int.
3483 typedef int atomic_type;
3484 atomic_type c1;
3485 atomic_type c2;
3486 atomic_type c3(0);
3487 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3488 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3489 __ATOMIC_RELAXED);
3490 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3491 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3493 return 0;
3494 }
3495 EOF
3497 AC_MSG_CHECKING([for atomic builtins for int])
3498 if AC_TRY_EVAL(ac_compile); then
3499 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3500 glibcxx_cv_atomic_int=no
3501 else
3502 glibcxx_cv_atomic_int=yes
3503 fi
3504 fi
3505 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3506 rm -f conftest*
3508 cat > conftest.$ac_ext << EOF
3509 [#]line __oline__ "configure"
3510 int main()
3511 {
3512 typedef long long atomic_type;
3513 atomic_type c1;
3514 atomic_type c2;
3515 atomic_type c3(0);
3516 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3517 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3518 __ATOMIC_RELAXED);
3519 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3520 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3522 return 0;
3523 }
3524 EOF
3526 AC_MSG_CHECKING([for atomic builtins for long long])
3527 if AC_TRY_EVAL(ac_compile); then
3528 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3529 glibcxx_cv_atomic_long_long=no
3530 else
3531 glibcxx_cv_atomic_long_long=yes
3532 fi
3533 fi
3534 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3535 rm -f conftest*
3537 fi
3539 CXXFLAGS="$old_CXXFLAGS"
3540 AC_LANG_RESTORE
3542 # Set atomicity_dir to builtins if all but the long long test above passes,
3543 # or if the builtins were already chosen (e.g. by configure.host).
3544 if { test "$glibcxx_cv_atomic_bool" = yes \
3545 && test "$glibcxx_cv_atomic_short" = yes \
3546 && test "$glibcxx_cv_atomic_int" = yes; } \
3547 || test "$atomicity_dir" = "cpu/generic/atomicity_builtins"; then
3548 AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS, 1,
3549 [Define if the compiler supports C++11 atomics.])
3550 atomicity_dir=cpu/generic/atomicity_builtins
3551 fi
3553 # If still generic, set to mutex.
3554 if test $atomicity_dir = "cpu/generic" ; then
3555 atomicity_dir=cpu/generic/atomicity_mutex
3556 AC_MSG_WARN([No native atomic operations are provided for this platform.])
3557 if test "x$target_thread_file" = xsingle; then
3558 AC_MSG_WARN([They cannot be faked when thread support is disabled.])
3559 AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
3560 else
3561 AC_MSG_WARN([They will be faked using a mutex.])
3562 AC_MSG_WARN([Performance of certain classes will degrade as a result.])
3563 fi
3564 fi
3566 ])
3568 dnl
3569 dnl Set default lock policy for synchronizing shared_ptr reference counting.
3570 dnl
3571 dnl --with-libstdcxx-lock-policy=auto
3572 dnl Use atomic operations for shared_ptr reference counting only if
3573 dnl the default target supports atomic compare-and-swap.
3574 dnl --with-libstdcxx-lock-policy=atomic
3575 dnl Use atomic operations for shared_ptr reference counting.
3576 dnl --with-libstdcxx-lock-policy=mutex
3577 dnl Use a mutex to synchronize shared_ptr reference counting.
3578 dnl
3579 dnl This controls the value of __gnu_cxx::__default_lock_policy, which
3580 dnl determines how shared_ptr reference counts are synchronized.
3581 dnl The option "atomic" means that atomic operations should be used,
3582 dnl "mutex" means that a mutex will be used. The default option, "auto",
3583 dnl will check if the target supports the compiler-generated builtins
3584 dnl for atomic compare-and-swap operations for 2-byte and 4-byte integers,
3585 dnl and will use "atomic" if supported, "mutex" otherwise.
3586 dnl This option is ignored if the thread model used by GCC is "single",
3587 dnl as no synchronization is used at all in that case.
3588 dnl This option affects the library ABI (except in the "single" thread model).
3589 dnl
3590 dnl Defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY to 1 if atomics should be used.
3591 dnl
3592 AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [
3594 AC_ARG_WITH([libstdcxx-lock-policy],
3595 AC_HELP_STRING([--with-libstdcxx-lock-policy={atomic,mutex,auto}],
3596 [synchronization policy for shared_ptr reference counting [default=auto]]),
3597 [libstdcxx_atomic_lock_policy=$withval],
3598 [libstdcxx_atomic_lock_policy=auto])
3600 case "$libstdcxx_atomic_lock_policy" in
3601 atomic|mutex|auto) ;;
3602 *) AC_MSG_ERROR([Invalid argument for --with-libstdcxx-lock-policy]) ;;
3603 esac
3604 AC_MSG_CHECKING([for lock policy for shared_ptr reference counts])
3606 if test x"$libstdcxx_atomic_lock_policy" = x"auto"; then
3607 AC_LANG_SAVE
3608 AC_LANG_CPLUSPLUS
3609 ac_save_CXXFLAGS="$CXXFLAGS"
3611 dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?!
3612 dnl Why don't we check 8-byte CAS for sparc64, where _Atomic_word is long?!
3613 dnl New targets should only check for CAS for the _Atomic_word type.
3614 AC_TRY_COMPILE([
3615 #if defined __riscv
3616 # error "Defaulting to mutex-based locks for ABI compatibility"
3617 #endif
3618 #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
3619 # error "No 2-byte compare-and-swap"
3620 #elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
3621 # error "No 4-byte compare-and-swap"
3622 #endif
3623 ],,
3624 [libstdcxx_atomic_lock_policy=atomic],
3625 [libstdcxx_atomic_lock_policy=mutex])
3626 AC_LANG_RESTORE
3627 CXXFLAGS="$ac_save_CXXFLAGS"
3628 fi
3630 if test x"$libstdcxx_atomic_lock_policy" = x"atomic"; then
3631 AC_MSG_RESULT(atomic)
3632 AC_DEFINE(HAVE_ATOMIC_LOCK_POLICY,1,
3633 [Defined if shared_ptr reference counting should use atomic operations.])
3634 else
3635 AC_MSG_RESULT(mutex)
3636 fi
3638 ])
3640 dnl
3641 dnl Allow visibility attributes to be used on namespaces, objects, etc.
3642 dnl
3643 dnl --enable-libstdcxx-visibility enables attempt to use visibility attributes.
3644 dnl --disable-libstdcxx-visibility turns off all use of visibility attributes.
3645 dnl + Usage: GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY[(DEFAULT)]
3646 dnl Where DEFAULT is 'yes'.
3647 dnl
3648 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY], [
3649 GLIBCXX_ENABLE(libstdcxx-visibility,$1,,[enables visibility safe usage])
3651 if test x$enable_libstdcxx_visibility = xyes ; then
3652 dnl all hail libgfortran
3653 dnl Check whether the target supports hidden visibility.
3654 AC_CACHE_CHECK([whether the target supports hidden visibility],
3655 glibcxx_cv_have_attribute_visibility, [
3656 save_CFLAGS="$CFLAGS"
3657 CFLAGS="$CFLAGS -Werror"
3658 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
3659 [], glibcxx_cv_have_attribute_visibility=yes,
3660 glibcxx_cv_have_attribute_visibility=no)
3661 CFLAGS="$save_CFLAGS"])
3662 if test $glibcxx_cv_have_attribute_visibility = no; then
3663 enable_libstdcxx_visibility=no
3664 fi
3665 fi
3667 GLIBCXX_CONDITIONAL(ENABLE_VISIBILITY, test $enable_libstdcxx_visibility = yes)
3668 AC_MSG_NOTICE([visibility supported: $enable_libstdcxx_visibility])
3669 ])
3672 dnl
3673 dnl Add version tags to symbols in shared library (or not), additionally
3674 dnl marking other symbols as private/local (or not).
3675 dnl
3676 dnl Sets libtool_VERSION, and determines shared library SONAME.
3677 dnl
3678 dnl This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
3679 dnl
3680 dnl --enable-symvers=style adds a version script to the linker call when
3681 dnl creating the shared library. The choice of version script is
3682 dnl controlled by 'style'.
3683 dnl --disable-symvers does not.
3684 dnl
3685 dnl + Usage: GLIBCXX_ENABLE_SYMVERS[(DEFAULT)]
3686 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
3687 dnl choose a default style based on linker characteristics. Passing
3688 dnl 'no' disables versioning.
3689 dnl
3690 AC_DEFUN([GLIBCXX_ENABLE_SYMVERS], [
3692 GLIBCXX_ENABLE(symvers,$1,[[[=STYLE]]],
3693 [enables symbol versioning of the shared library],
3694 [permit yes|no|gnu|gnu-versioned-namespace|darwin|darwin-export|sun])
3696 # If we never went through the GLIBCXX_CHECK_LINKER_FEATURES macro, then we
3697 # don't know enough about $LD to do tricks...
3698 AC_REQUIRE([GLIBCXX_CHECK_LINKER_FEATURES])
3699 # Sun style symbol versions needs GNU c++filt for make_sunver.pl to work
3700 # with extern "C++" in version scripts.
3701 AC_REQUIRE([GCC_PROG_GNU_CXXFILT])
3703 # Turn a 'yes' into a suitable default.
3704 if test x$enable_symvers = xyes ; then
3705 if test $enable_shared = no || test "x$LD" = x || test x$gcc_no_link = xyes; then
3706 enable_symvers=no
3707 else
3708 if test $with_gnu_ld = yes ; then
3709 case ${target_os} in
3710 hpux*)
3711 enable_symvers=no ;;
3712 *)
3713 enable_symvers=gnu ;;
3714 esac
3715 else
3716 case ${target_os} in
3717 darwin*)
3718 enable_symvers=darwin ;;
3719 # Sun symbol versioning exists since Solaris 2.5.
3720 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
3721 # make_sunver.pl needs GNU c++filt to support extern "C++" in
3722 # version scripts, so disable symbol versioning if none can be
3723 # found.
3724 if test -z "$ac_cv_path_CXXFILT"; then
3725 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3726 AC_MSG_WARN([=== no GNU c++filt could be found.])
3727 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3728 enable_symvers=no
3729 else
3730 enable_symvers=sun
3731 fi
3732 ;;
3733 *)
3734 enable_symvers=no ;;
3735 esac
3736 fi
3737 fi
3738 fi
3740 # Check to see if 'darwin' or 'darwin-export' can win.
3741 if test x$enable_symvers = xdarwin-export ; then
3742 enable_symvers=darwin
3743 fi
3745 # Check if 'sun' was requested on non-Solaris 2 platforms.
3746 if test x$enable_symvers = xsun ; then
3747 case ${target_os} in
3748 solaris2*)
3749 # All fine.
3750 ;;
3751 *)
3752 # Unlikely to work.
3753 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3754 AC_MSG_WARN([=== you are not targetting Solaris 2.])
3755 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3756 enable_symvers=no
3757 ;;
3758 esac
3759 fi
3761 # Check to see if 'gnu' can win.
3762 if test $enable_symvers = gnu ||
3763 test $enable_symvers = gnu-versioned-namespace ||
3764 test $enable_symvers = sun; then
3765 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
3766 AC_MSG_CHECKING([for shared libgcc])
3767 ac_save_CFLAGS="$CFLAGS"
3768 CFLAGS=' -lgcc_s'
3769 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes, glibcxx_shared_libgcc=no)
3770 CFLAGS="$ac_save_CFLAGS"
3771 if test $glibcxx_shared_libgcc = no; then
3772 cat > conftest.c <<EOF
3773 int main (void) { return 0; }
3774 EOF
3775 changequote(,)dnl
3776 glibcxx_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
3777 -shared -shared-libgcc -o conftest.so \
3778 conftest.c -v 2>&1 >/dev/null \
3779 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
3780 changequote([,])dnl
3781 rm -f conftest.c conftest.so
3782 if test x${glibcxx_libgcc_s_suffix+set} = xset; then
3783 CFLAGS=" -lgcc_s$glibcxx_libgcc_s_suffix"
3784 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes)
3785 CFLAGS="$ac_save_CFLAGS"
3786 fi
3787 fi
3788 AC_MSG_RESULT($glibcxx_shared_libgcc)
3790 # For GNU ld, we need at least this version. The format is described in
3791 # GLIBCXX_CHECK_LINKER_FEATURES above.
3792 glibcxx_min_gnu_ld_version=21400
3794 # If no shared libgcc, can't win.
3795 if test $glibcxx_shared_libgcc != yes; then
3796 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3797 AC_MSG_WARN([=== you are not building a shared libgcc_s.])
3798 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3799 enable_symvers=no
3800 elif test $with_gnu_ld != yes && test $enable_symvers = sun; then
3801 : All interesting versions of Sun ld support sun style symbol versioning.
3802 elif test $with_gnu_ld != yes ; then
3803 # just fail for now
3804 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3805 AC_MSG_WARN([=== you are not using the GNU linker.])
3806 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3807 enable_symvers=no
3808 elif test $glibcxx_ld_is_gold = yes ; then
3809 : All versions of gold support symbol versioning.
3810 elif test $glibcxx_ld_is_mold = yes ; then
3811 : All versions of mold support symbol versioning.
3812 elif test $glibcxx_gnu_ld_version -lt $glibcxx_min_gnu_ld_version ; then
3813 # The right tools, the right setup, but too old. Fallbacks?
3814 AC_MSG_WARN(=== Linker version $glibcxx_gnu_ld_version is too old for)
3815 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
3816 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
3817 AC_MSG_WARN(=== $glibcxx_min_gnu_ld_version or later and rebuild GCC.)
3818 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3819 enable_symvers=no
3820 fi
3821 fi
3823 # For libtool versioning info, format is CURRENT:REVISION:AGE
3824 libtool_VERSION=6:30:0
3826 # Everything parsed; figure out what files and settings to use.
3827 case $enable_symvers in
3828 no)
3829 SYMVER_FILE=config/abi/pre/none.ver
3830 ;;
3831 gnu)
3832 SYMVER_FILE=config/abi/pre/gnu.ver
3833 AC_DEFINE(_GLIBCXX_SYMVER_GNU, 1,
3834 [Define to use GNU versioning in the shared library.])
3835 ;;
3836 gnu-versioned-namespace)
3837 libtool_VERSION=8:0:0
3838 SYMVER_FILE=config/abi/pre/gnu-versioned-namespace.ver
3839 AC_DEFINE(_GLIBCXX_SYMVER_GNU_NAMESPACE, 1,
3840 [Define to use GNU namespace versioning in the shared library.])
3841 ;;
3842 darwin)
3843 SYMVER_FILE=config/abi/pre/gnu.ver
3844 AC_DEFINE(_GLIBCXX_SYMVER_DARWIN, 1,
3845 [Define to use darwin versioning in the shared library.])
3846 ;;
3847 sun)
3848 SYMVER_FILE=config/abi/pre/gnu.ver
3849 AC_DEFINE(_GLIBCXX_SYMVER_SUN, 1,
3850 [Define to use Sun versioning in the shared library.])
3851 ;;
3852 esac
3854 if test x$enable_symvers != xno ; then
3855 AC_DEFINE(_GLIBCXX_SYMVER, 1,
3856 [Define to use symbol versioning in the shared library.])
3857 fi
3859 AC_CACHE_CHECK([whether the target supports .symver directive],
3860 glibcxx_cv_have_as_symver_directive, [
3861 AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
3862 [], glibcxx_cv_have_as_symver_directive=yes,
3863 glibcxx_cv_have_as_symver_directive=no)])
3864 if test $glibcxx_cv_have_as_symver_directive = yes; then
3865 AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
3866 [Define to 1 if the target assembler supports .symver directive.])
3867 fi
3869 AC_SUBST(SYMVER_FILE)
3870 AC_SUBST(port_specific_symbol_files)
3871 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS, test $enable_symvers != no)
3872 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU, test $enable_symvers = gnu)
3873 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU_NAMESPACE, test $enable_symvers = gnu-versioned-namespace)
3874 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_DARWIN, test $enable_symvers = darwin)
3875 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_SUN, test $enable_symvers = sun)
3876 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
3878 if test $enable_symvers != no ; then
3879 case ${target_os} in
3880 # The Solaris 2 runtime linker doesn't support the GNU extension of
3881 # binding the same symbol to different versions
3882 solaris2*)
3883 ;;
3884 # Other platforms with GNU symbol versioning (GNU/Linux, more?) do.
3885 *)
3886 AC_DEFINE(HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT, 1,
3887 [Define to 1 if the target runtime linker supports binding the same symbol to different versions.])
3888 ;;
3889 esac
3890 fi
3892 # Now, set up compatibility support, if any.
3893 # In addition, need this to deal with std::size_t mangling in
3894 # src/compatibility.cc. In a perfect world, could use
3895 # typeid(std::size_t).name()[0] to do direct substitution.
3896 AC_MSG_CHECKING([for size_t as unsigned int])
3897 ac_save_CFLAGS="$CFLAGS"
3898 CFLAGS="-Werror"
3899 AC_TRY_COMPILE(, [__SIZE_TYPE__* stp; unsigned int* uip; stp = uip;],
3900 [glibcxx_size_t_is_i=yes], [glibcxx_size_t_is_i=no])
3901 CFLAGS=$ac_save_CFLAGS
3902 if test "$glibcxx_size_t_is_i" = yes; then
3903 AC_DEFINE(_GLIBCXX_SIZE_T_IS_UINT, 1, [Define if size_t is unsigned int.])
3904 fi
3905 AC_MSG_RESULT([$glibcxx_size_t_is_i])
3907 AC_MSG_CHECKING([for ptrdiff_t as int])
3908 ac_save_CFLAGS="$CFLAGS"
3909 CFLAGS="-Werror"
3910 AC_TRY_COMPILE(, [__PTRDIFF_TYPE__* ptp; int* ip; ptp = ip;],
3911 [glibcxx_ptrdiff_t_is_i=yes], [glibcxx_ptrdiff_t_is_i=no])
3912 CFLAGS=$ac_save_CFLAGS
3913 if test "$glibcxx_ptrdiff_t_is_i" = yes; then
3914 AC_DEFINE(_GLIBCXX_PTRDIFF_T_IS_INT, 1, [Define if ptrdiff_t is int.])
3915 fi
3916 AC_MSG_RESULT([$glibcxx_ptrdiff_t_is_i])
3917 ])
3920 dnl
3921 dnl Setup to use the gcc gthr.h thread-specific memory and mutex model.
3922 dnl We must stage the required headers so that they will be installed
3923 dnl with the library (unlike libgcc, the STL implementation is provided
3924 dnl solely within headers). Since we must not inject random user-space
3925 dnl macro names into user-provided C++ code, we first stage into <file>-in
3926 dnl and process to <file> with an output command. The reason for a two-
3927 dnl stage process here is to correctly handle $srcdir!=$objdir without
3928 dnl having to write complex code (the sed commands to clean the macro
3929 dnl namespace are complex and fragile enough as it is). We must also
3930 dnl add a relative path so that -I- is supported properly.
3931 dnl
3932 dnl Substs:
3933 dnl thread_header
3934 dnl
3935 AC_DEFUN([GLIBCXX_ENABLE_THREADS], [
3936 AC_MSG_CHECKING([for thread model used by GCC])
3937 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3938 AC_MSG_RESULT([$target_thread_file])
3939 GCC_AC_THREAD_HEADER([$target_thread_file])
3940 ])
3943 dnl
3944 dnl Check if gthread implementation defines the types and functions
3945 dnl required by the c++0x thread library. Conforming gthread
3946 dnl implementations can define __GTHREADS_CXX0X to enable use with c++0x.
3947 dnl
3948 dnl GLIBCXX_ENABLE_SYMVERS must be done before this.
3949 dnl
3950 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
3951 GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
3953 if test x$enable_libstdcxx_threads = xauto ||
3954 test x$enable_libstdcxx_threads = xyes; then
3956 AC_LANG_SAVE
3957 AC_LANG_CPLUSPLUS
3959 ac_save_CXXFLAGS="$CXXFLAGS"
3960 CXXFLAGS="$CXXFLAGS -fno-exceptions \
3961 -I${toplevel_srcdir}/libgcc -I${toplevel_builddir}/libgcc"
3963 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3964 case $target_thread_file in
3965 posix)
3966 CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
3967 esac
3969 AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
3971 AC_TRY_COMPILE([#include <unistd.h>],
3972 [
3973 // In case of POSIX threads check _POSIX_TIMEOUTS.
3974 #if (defined(_PTHREADS) \
3975 && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
3976 #error
3977 #endif
3978 ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
3980 AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
3981 [Define to 1 if mutex_timedlock is available.])
3983 if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
3984 else res_mutex_timedlock=no ; fi
3985 AC_MSG_RESULT([$res_mutex_timedlock])
3987 AC_MSG_CHECKING([for gthreads library])
3989 AC_TRY_COMPILE([#include "gthr.h"],
3990 [
3991 #ifndef __GTHREADS_CXX0X
3992 #error
3993 #endif
3994 ], [ac_has_gthreads=yes], [ac_has_gthreads=no])
3995 else
3996 ac_has_gthreads=no
3997 fi
3999 AC_MSG_RESULT([$ac_has_gthreads])
4001 if test x"$ac_has_gthreads" = x"yes"; then
4002 AC_DEFINE(_GLIBCXX_HAS_GTHREADS, 1,
4003 [Define if gthreads library is available.])
4005 # Also check for pthread_rwlock_t for std::shared_timed_mutex in C++14
4006 # but only do so if we're using pthread in the gthread library.
4007 # On VxWorks for example, pthread_rwlock_t is defined in sys/types.h
4008 # but the pthread library is not there by default and the gthread library
4009 # does not use it.
4010 AC_TRY_COMPILE([#include "gthr.h"],
4011 [
4012 #if (!defined(_PTHREADS))
4013 #error
4014 #endif
4015 ], [ac_gthread_use_pthreads=yes], [ac_gthread_use_pthreads=no])
4016 if test x"$ac_gthread_use_pthreads" = x"yes"; then
4017 AC_CHECK_TYPE([pthread_rwlock_t],
4018 [AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
4019 [Define if POSIX read/write locks are available in <gthr.h>.])],
4020 [],
4021 [#include "gthr.h"])
4022 fi
4023 fi
4025 AC_CHECK_HEADER(semaphore.h, [
4026 AC_MSG_CHECKING([for POSIX Semaphores and sem_timedwait])
4027 AC_TRY_COMPILE([
4028 #include <unistd.h>
4029 #include <semaphore.h>
4030 #include <limits.h>
4031 ],
4032 [
4033 #if !defined _POSIX_TIMEOUTS || _POSIX_TIMEOUTS <= 0
4034 # error "POSIX Timeouts option not supported"
4035 #elif !defined _POSIX_SEMAPHORES || _POSIX_SEMAPHORES <= 0
4036 # error "POSIX Semaphores option not supported"
4037 #else
4038 #if defined SEM_VALUE_MAX
4039 constexpr int sem_value_max = SEM_VALUE_MAX;
4040 #elif defined _POSIX_SEM_VALUE_MAX
4041 constexpr int sem_value_max = _POSIX_SEM_VALUE_MAX;
4042 #else
4043 # error "SEM_VALUE_MAX not available"
4044 #endif
4045 sem_t sem;
4046 sem_init(&sem, 0, sem_value_max);
4047 struct timespec ts = { 0 };
4048 sem_timedwait(&sem, &ts);
4049 #endif
4050 ],
4051 [ac_have_posix_semaphore=yes],
4052 [ac_have_posix_semaphore=no])],
4053 [ac_have_posix_semaphore=no])
4055 if test $ac_have_posix_semaphore = yes ; then
4056 AC_DEFINE(HAVE_POSIX_SEMAPHORE,
4057 1,
4058 [Define to 1 if POSIX Semaphores with sem_timedwait are available in <semaphore.h>.])
4059 fi
4060 AC_MSG_RESULT([$ac_have_posix_semaphore])
4062 CXXFLAGS="$ac_save_CXXFLAGS"
4063 AC_LANG_RESTORE
4064 ])
4067 # Check whether LC_MESSAGES is available in <locale.h>.
4068 # Ulrich Drepper <drepper@cygnus.com>, 1995.
4069 #
4070 # This file file be copied and used freely without restrictions. It can
4071 # be used in projects which are not available under the GNU Public License
4072 # but which still want to provide support for the GNU gettext functionality.
4073 # Please note that the actual code is *not* freely available.
4074 AC_DEFUN([AC_LC_MESSAGES], [
4075 AC_CHECK_HEADER(locale.h, [
4076 AC_CACHE_CHECK([for LC_MESSAGES], ac_cv_val_LC_MESSAGES,
4077 [AC_TRY_COMPILE([#include <locale.h>], [return LC_MESSAGES],
4078 ac_cv_val_LC_MESSAGES=yes, ac_cv_val_LC_MESSAGES=no)])
4079 if test $ac_cv_val_LC_MESSAGES = yes; then
4080 AC_DEFINE(HAVE_LC_MESSAGES, 1,
4081 [Define if LC_MESSAGES is available in <locale.h>.])
4082 fi
4083 ])
4084 ])
4086 dnl
4087 dnl Check whether rdrand is supported in the assembler.
4088 AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [
4089 AC_CACHE_CHECK([for rdrand support in assembler],
4090 ac_cv_x86_rdrand, [
4091 ac_cv_x86_rdrand=no
4092 case "$target" in
4093 i?86-*-* | \
4094 x86_64-*-*)
4095 AC_TRY_COMPILE(, [asm("rdrand %eax");],
4096 [ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no])
4097 esac
4098 ])
4099 if test $ac_cv_x86_rdrand = yes; then
4100 AC_DEFINE(_GLIBCXX_X86_RDRAND, 1,
4101 [ Defined if as can handle rdrand. ])
4102 fi
4103 ])
4105 dnl
4106 dnl Check whether rdseed is supported in the assembler.
4107 AC_DEFUN([GLIBCXX_CHECK_X86_RDSEED], [
4108 AC_CACHE_CHECK([for rdseed support in assembler],
4109 ac_cv_x86_rdseed, [
4110 ac_cv_x86_rdseed=no
4111 case "$target" in
4112 i?86-*-* | \
4113 x86_64-*-*)
4114 AC_TRY_COMPILE(, [asm("rdseed %eax");],
4115 [ac_cv_x86_rdseed=yes], [ac_cv_x86_rdseed=no])
4116 esac
4117 ])
4118 if test $ac_cv_x86_rdseed = yes; then
4119 AC_DEFINE(_GLIBCXX_X86_RDSEED, 1,
4120 [ Defined if as can handle rdseed. ])
4121 fi
4122 ])
4124 dnl
4125 dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS.
4126 dnl
4127 AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [
4129 AC_LANG_SAVE
4130 AC_LANG_CPLUSPLUS
4131 ac_save_CXXFLAGS="$CXXFLAGS"
4132 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4134 AC_CACHE_CHECK([for get_nprocs],
4135 glibcxx_cv_GET_NPROCS, [
4136 GCC_TRY_COMPILE_OR_LINK(
4137 [#include <sys/sysinfo.h>],
4138 [int n = get_nprocs();],
4139 [glibcxx_cv_GET_NPROCS=yes],
4140 [glibcxx_cv_GET_NPROCS=no])
4141 ])
4142 if test $glibcxx_cv_GET_NPROCS = yes; then
4143 AC_DEFINE(_GLIBCXX_USE_GET_NPROCS, 1, [Define if get_nprocs is available in <sys/sysinfo.h>.])
4144 fi
4146 CXXFLAGS="$ac_save_CXXFLAGS"
4147 AC_LANG_RESTORE
4148 ])
4150 dnl
4151 dnl Check whether sysconf(_SC_NPROCESSORS_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROCESSORS_ONLN.
4152 dnl
4153 AC_DEFUN([GLIBCXX_CHECK_SC_NPROCESSORS_ONLN], [
4155 AC_LANG_SAVE
4156 AC_LANG_CPLUSPLUS
4157 ac_save_CXXFLAGS="$CXXFLAGS"
4158 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4160 AC_CACHE_CHECK([for _SC_NPROCESSORS_ONLN],
4161 glibcxx_cv_SC_NPROCESSORS_ONLN, [
4162 GCC_TRY_COMPILE_OR_LINK(
4163 [#include <unistd.h>],
4164 [int n = sysconf(_SC_NPROCESSORS_ONLN);],
4165 [glibcxx_cv_SC_NPROCESSORS_ONLN=yes],
4166 [glibcxx_cv_SC_NPROCESSORS_ONLN=no])
4167 ])
4168 if test $glibcxx_cv_SC_NPROCESSORS_ONLN = yes; then
4169 AC_DEFINE(_GLIBCXX_USE_SC_NPROCESSORS_ONLN, 1, [Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>.])
4170 fi
4172 CXXFLAGS="$ac_save_CXXFLAGS"
4173 AC_LANG_RESTORE
4174 ])
4176 dnl
4177 dnl Check whether sysconf(_SC_NPROC_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROC_ONLN.
4178 dnl
4179 AC_DEFUN([GLIBCXX_CHECK_SC_NPROC_ONLN], [
4181 AC_LANG_SAVE
4182 AC_LANG_CPLUSPLUS
4183 ac_save_CXXFLAGS="$CXXFLAGS"
4184 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4186 AC_CACHE_CHECK([for _SC_NPROC_ONLN],
4187 glibcxx_cv_SC_NPROC_ONLN, [
4188 GCC_TRY_COMPILE_OR_LINK(
4189 [#include <unistd.h>],
4190 [int n = sysconf(_SC_NPROC_ONLN);],
4191 [glibcxx_cv_SC_NPROC_ONLN=yes],
4192 [glibcxx_cv_SC_NPROC_ONLN=no])
4193 ])
4194 if test $glibcxx_cv_SC_NPROC_ONLN = yes; then
4195 AC_DEFINE(_GLIBCXX_USE_SC_NPROC_ONLN, 1, [Define if _SC_NPROC_ONLN is available in <unistd.h>.])
4196 fi
4198 CXXFLAGS="$ac_save_CXXFLAGS"
4199 AC_LANG_RESTORE
4200 ])
4202 dnl
4203 dnl Check whether pthread_num_processors_np is available in <pthread.h>, and define _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP.
4204 dnl
4205 AC_DEFUN([GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP], [
4207 AC_LANG_SAVE
4208 AC_LANG_CPLUSPLUS
4209 ac_save_CXXFLAGS="$CXXFLAGS"
4210 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4212 AC_CACHE_CHECK([for pthreads_num_processors_np],
4213 glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP, [
4214 GCC_TRY_COMPILE_OR_LINK(
4215 [#include <pthread.h>],
4216 [int n = pthread_num_processors_np();],
4217 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=yes],
4218 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=no])
4219 ])
4220 if test $glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP = yes; then
4221 AC_DEFINE(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP, 1, [Define if pthreads_num_processors_np is available in <pthread.h>.])
4222 fi
4224 CXXFLAGS="$ac_save_CXXFLAGS"
4225 AC_LANG_RESTORE
4226 ])
4228 dnl
4229 dnl Check whether pthread_cond_clockwait is available in <pthread.h> for std::condition_variable to use,
4230 dnl and define _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT.
4231 dnl
4232 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT], [
4234 AC_LANG_SAVE
4235 AC_LANG_CPLUSPLUS
4236 ac_save_CXXFLAGS="$CXXFLAGS"
4237 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4238 ac_save_LIBS="$LIBS"
4239 LIBS="$LIBS -lpthread"
4241 AC_CACHE_CHECK([for pthread_cond_clockwait],
4242 glibcxx_cv_PTHREAD_COND_CLOCKWAIT, [
4243 GCC_TRY_COMPILE_OR_LINK(
4244 [#include <pthread.h>],
4245 [pthread_mutex_t mutex; pthread_cond_t cond; struct timespec ts; int n = pthread_cond_clockwait(&cond, &mutex, 0, &ts);],
4246 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=yes],
4247 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=no])
4248 ])
4249 if test $glibcxx_cv_PTHREAD_COND_CLOCKWAIT = yes; then
4250 AC_DEFINE(_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT, 1, [Define if pthread_cond_clockwait is available in <pthread.h>.])
4251 fi
4253 CXXFLAGS="$ac_save_CXXFLAGS"
4254 LIBS="$ac_save_LIBS"
4255 AC_LANG_RESTORE
4256 ])
4258 dnl
4259 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4260 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4261 dnl
4262 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK], [
4264 AC_LANG_SAVE
4265 AC_LANG_CPLUSPLUS
4266 ac_save_CXXFLAGS="$CXXFLAGS"
4267 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4268 ac_save_LIBS="$LIBS"
4269 LIBS="$LIBS -lpthread"
4271 AC_CACHE_CHECK([for pthread_mutex_clocklock],
4272 glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK, [
4273 GCC_TRY_COMPILE_OR_LINK(
4274 [#include <pthread.h>],
4275 [pthread_mutex_t mutex; struct timespec ts; int n = pthread_mutex_clocklock(&mutex, CLOCK_REALTIME, &ts);],
4276 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=yes],
4277 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=no])
4278 ])
4279 if test $glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK = yes; then
4280 AC_DEFINE(_GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK, 1, [Define if pthread_mutex_clocklock is available in <pthread.h>.])
4281 fi
4283 CXXFLAGS="$ac_save_CXXFLAGS"
4284 LIBS="$ac_save_LIBS"
4285 AC_LANG_RESTORE
4286 ])
4288 dnl
4289 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4290 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4291 dnl
4292 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK], [
4294 AC_LANG_SAVE
4295 AC_LANG_CPLUSPLUS
4296 ac_save_CXXFLAGS="$CXXFLAGS"
4297 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4298 ac_save_LIBS="$LIBS"
4299 LIBS="$LIBS -lpthread"
4301 AC_CACHE_CHECK([for pthread_rwlock_clockrdlock, pthread_wlock_clockwrlock],
4302 glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK, [
4303 GCC_TRY_COMPILE_OR_LINK(
4304 [#include <pthread.h>],
4305 [pthread_rwlock_t rwl; struct timespec ts;]
4306 [int n = pthread_rwlock_clockrdlock(&rwl, CLOCK_REALTIME, &ts);]
4307 [int m = pthread_rwlock_clockwrlock(&rwl, CLOCK_REALTIME, &ts);],
4308 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=yes],
4309 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=no])
4310 ])
4311 if test $glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK = yes; then
4312 AC_DEFINE(_GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK, 1, [Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are available in <pthread.h>.])
4313 fi
4315 CXXFLAGS="$ac_save_CXXFLAGS"
4316 LIBS="$ac_save_LIBS"
4317 AC_LANG_RESTORE
4318 ])
4320 dnl
4321 dnl Check whether sysctl is available in <pthread.h>, and define _GLIBCXX_USE_SYSCTL_HW_NCPU.
4322 dnl
4323 AC_DEFUN([GLIBCXX_CHECK_SYSCTL_HW_NCPU], [
4325 AC_LANG_SAVE
4326 AC_LANG_CPLUSPLUS
4327 ac_save_CXXFLAGS="$CXXFLAGS"
4328 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4330 AC_CACHE_CHECK([for hw.ncpu sysctl],
4331 glibcxx_cv_SYSCTL_HW_NCPU, [
4332 GCC_TRY_COMPILE_OR_LINK(
4333 [
4334 #include <stddef.h>
4335 #include <sys/sysctl.h>
4336 ],
4337 [
4338 int count;
4339 size_t size = sizeof(count);
4340 int mib[] = { CTL_HW, HW_NCPU };
4341 sysctl(mib, 2, &count, &size, NULL, 0);
4342 ],
4343 [glibcxx_cv_SYSCTL_HW_NCPU=yes],
4344 [glibcxx_cv_SYSCTL_HW_NCPU=no])
4345 ])
4346 if test $glibcxx_cv_SYSCTL_HW_NCPU = yes; then
4347 AC_DEFINE(_GLIBCXX_USE_SYSCTL_HW_NCPU, 1, [Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>.])
4348 fi
4350 CXXFLAGS="$ac_save_CXXFLAGS"
4351 AC_LANG_RESTORE
4352 ])
4354 dnl
4355 dnl Check to see if python pretty printing can be activated.
4356 dnl
4357 dnl --with-python-dir=dir
4358 dnl installs directory into $prefix/dir
4359 AC_DEFUN([GLIBCXX_ENABLE_PYTHON], [
4361 AC_MSG_CHECKING([for custom python install directory])
4362 AC_ARG_WITH([python-dir],
4363 AS_HELP_STRING([--with-python-dir],
4364 [the location to install Python modules. This path is relative starting from the prefix.]),
4365 [with_python_dir=$withval], [with_python_dir="no"])
4366 AC_MSG_RESULT(${with_python_dir})
4368 # Needed for installing Python modules during make install.
4369 python_mod_dir="${with_python_dir}"
4370 AC_SUBST(python_mod_dir)
4371 GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
4372 ])
4374 dnl
4375 dnl Check to see if -Werror is disabled.
4376 dnl
4377 dnl --enable-werror/--disable-werror
4378 AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
4379 AC_MSG_CHECKING([for -Werror])
4380 GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
4381 AC_MSG_RESULT($enable_werror)
4382 GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
4383 ])
4385 dnl
4386 dnl Check whether obsolescent tmpnam is available in <stdio.h>,
4387 dnl and define _GLIBCXX_USE_TMPNAM.
4388 dnl
4389 AC_DEFUN([GLIBCXX_CHECK_TMPNAM], [dnl
4390 dnl
4391 AC_LANG_SAVE
4392 AC_LANG_CPLUSPLUS
4393 ac_save_CXXFLAGS="$CXXFLAGS"
4394 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4395 dnl
4396 AC_CACHE_CHECK([for tmpnam], glibcxx_cv_TMPNAM, [dnl
4397 GCC_TRY_COMPILE_OR_LINK(
4398 [#include <stdio.h>],
4399 [char *tmp = tmpnam(NULL);],
4400 [glibcxx_cv_TMPNAM=yes],
4401 [glibcxx_cv_TMPNAM=no])
4402 ])
4403 if test $glibcxx_cv_TMPNAM = yes; then
4404 AC_DEFINE(_GLIBCXX_USE_TMPNAM, 1, [Define if obsolescent tmpnam is available in <stdio.h>.])
4405 fi
4406 dnl
4407 CXXFLAGS="$ac_save_CXXFLAGS"
4408 AC_LANG_RESTORE
4409 ])
4411 dnl
4412 dnl Check to see if sys/sdt.h exists and that it is suitable for use.
4413 dnl Some versions of sdt.h were not compatible with C++11.
4414 dnl
4415 AC_DEFUN([GLIBCXX_CHECK_SDT_H], [
4416 # Note that this test has to be run with the C language.
4417 # Otherwise, sdt.h will try to include some headers from
4418 # libstdc++ itself.
4419 AC_LANG_SAVE
4420 AC_LANG_C
4421 AC_CACHE_CHECK([for suitable sys/sdt.h],
4422 glibcxx_cv_sys_sdt_h, [
4423 # Because we have to run the test in C, we use grep rather
4424 # than the compiler to check for the bug. The bug is that
4425 # were strings without trailing whitespace, causing g++
4426 # to look for operator"". The pattern searches for the fixed
4427 # output.
4428 AC_EGREP_CPP([ \",\" ], [
4429 #include <sys/sdt.h>
4430 int f() { STAP_PROBE(hi, bob); }
4431 ], [glibcxx_cv_sys_sdt_h=yes], [glibcxx_cv_sys_sdt_h=no])
4432 ])
4433 AC_LANG_RESTORE
4434 if test $glibcxx_cv_sys_sdt_h = yes; then
4435 AC_DEFINE(HAVE_SYS_SDT_H, 1,
4436 [Define to 1 if you have a suitable <sys/sdt.h> header file])
4437 fi
4438 ])
4440 dnl
4441 dnl Control whether the library should define symbols for old and new ABIs.
4442 dnl This affects definitions of strings, stringstreams and locale facets.
4443 dnl
4444 dnl --disable-libstdcxx-dual-abi will use old ABI for all types.
4445 dnl
4446 dnl Defines:
4447 dnl _GLIBCXX_USE_DUAL_ABI (always defined, either to 1 or 0)
4448 dnl
4449 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_DUAL_ABI], [
4450 GLIBCXX_ENABLE(libstdcxx-dual-abi,$1,,[support two versions of std::string])
4451 if test x$enable_symvers = xgnu-versioned-namespace; then
4452 # gnu-versioned-namespace is incompatible with the dual ABI.
4453 enable_libstdcxx_dual_abi="no"
4454 fi
4455 if test x"$enable_libstdcxx_dual_abi" != xyes; then
4456 AC_MSG_NOTICE([dual ABI is disabled])
4457 default_libstdcxx_abi="gcc4-compatible"
4458 fi
4459 GLIBCXX_CONDITIONAL(ENABLE_DUAL_ABI, test $enable_libstdcxx_dual_abi = yes)
4460 ])
4462 dnl
4463 dnl Check to see which ABI should be enabled by default.
4464 dnl
4465 dnl --with-default-libstdcxx-abi={gcc4-compatible,new}
4466 dnl
4467 dnl Defines:
4468 dnl _GLIBCXX_USE_CXX11_ABI (always defined, either to 1 or 0)
4469 dnl
4470 AC_DEFUN([GLIBCXX_DEFAULT_ABI], [
4471 if test x$enable_libstdcxx_dual_abi = xyes; then
4472 AC_MSG_CHECKING([for default std::string ABI to use])
4473 AC_ARG_WITH([default-libstdcxx-abi],
4474 AS_HELP_STRING([--with-default-libstdcxx-abi],
4475 [set the std::string ABI to use by default]),
4476 [case "$withval" in
4477 gcc4-compatible) default_libstdcxx_abi="gcc4-compatible" ;;
4478 new|cxx11) default_libstdcxx_abi="new" ;;
4479 c++*|gnu++*) AC_MSG_ERROR([Supported arguments for --with-default-libstdcxx-abi have changed, use "new" or "gcc4-compatible"]) ;;
4480 *) AC_MSG_ERROR([Invalid argument for --with-default-libstdcxx-abi]) ;;
4481 esac
4482 ],
4483 [default_libstdcxx_abi="new"])
4484 AC_MSG_RESULT(${default_libstdcxx_abi})
4485 fi
4486 if test $default_libstdcxx_abi = "new"; then
4487 glibcxx_cxx11_abi=1
4488 glibcxx_cxx98_abi=0
4489 else
4490 glibcxx_cxx11_abi=0
4491 glibcxx_cxx98_abi=1
4492 fi
4493 AC_SUBST(glibcxx_cxx98_abi)
4494 GLIBCXX_CONDITIONAL(ENABLE_CXX11_ABI, test $glibcxx_cxx11_abi = 1)
4495 ])
4497 dnl
4498 dnl Check to see whether to build libstdc++fs.a
4499 dnl
4500 dnl --enable-libstdcxx-filesystem-ts
4501 dnl
4502 AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
4503 GLIBCXX_ENABLE(libstdcxx-filesystem-ts,auto,,
4504 [turns on ISO/IEC TS 18822 support],
4505 [permit yes|no|auto])
4507 AC_MSG_CHECKING([whether to build Filesystem TS support])
4508 if test x"$ac_cv_header_dirent_h" != x"yes"; then
4509 enable_libstdcxx_filesystem_ts=no
4510 fi
4511 if test x"$enable_libstdcxx_filesystem_ts" = x"auto"; then
4512 case "${target_os}" in
4513 freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
4514 enable_libstdcxx_filesystem_ts=yes
4515 ;;
4516 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
4517 enable_libstdcxx_filesystem_ts=yes
4518 ;;
4519 rtems*)
4520 enable_libstdcxx_filesystem_ts=yes
4521 ;;
4522 solaris*)
4523 enable_libstdcxx_filesystem_ts=yes
4524 ;;
4525 mingw*)
4526 enable_libstdcxx_filesystem_ts=yes
4527 ;;
4528 *)
4529 enable_libstdcxx_filesystem_ts=no
4530 ;;
4531 esac
4532 fi
4533 AC_MSG_RESULT($enable_libstdcxx_filesystem_ts)
4534 GLIBCXX_CONDITIONAL(ENABLE_FILESYSTEM_TS, test $enable_libstdcxx_filesystem_ts = yes)
4535 ])
4537 dnl
4538 dnl Check whether the library calls required by the C++17 Filesystem library
4539 dnl and the Filesystem TS are present.
4540 dnl Defines:
4541 dnl HAVE_STRUCT_DIRENT_D_TYPE
4542 dnl _GLIBCXX_USE_REALPATH
4543 dnl _GLIBCXX_USE_UTIMENSAT
4544 dnl _GLIBCXX_USE_ST_MTIM
4545 dnl _GLIBCXX_USE_FCHMOD
4546 dnl _GLIBCXX_USE_FCHMODAT
4547 dnl _GLIBCXX_USE_SENDFILE
4548 dnl HAVE_LINK
4549 dnl HAVE_READLINK
4550 dnl HAVE_SYMLINK
4551 dnl
4552 AC_DEFUN([GLIBCXX_CHECK_FILESYSTEM_DEPS], [dnl
4553 dnl
4554 AC_LANG_SAVE
4555 AC_LANG_CPLUSPLUS
4556 ac_save_CXXFLAGS="$CXXFLAGS"
4557 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4558 dnl
4559 AC_CACHE_CHECK([for struct dirent.d_type], glibcxx_cv_dirent_d_type, [dnl
4560 GCC_TRY_COMPILE_OR_LINK(
4561 [#include <dirent.h>],
4562 [
4563 struct dirent d;
4564 if (sizeof d.d_type) return 0;
4565 ],
4566 [glibcxx_cv_dirent_d_type=yes],
4567 [glibcxx_cv_dirent_d_type=no])
4568 ])
4569 if test $glibcxx_cv_dirent_d_type = yes; then
4570 AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE, 1, [Define to 1 if `d_type' is a member of `struct dirent'.])
4571 fi
4572 dnl
4573 AC_CACHE_CHECK([for realpath], glibcxx_cv_realpath, [dnl
4574 GCC_TRY_COMPILE_OR_LINK(
4575 [
4576 #include <limits.h>
4577 #include <stdlib.h>
4578 #include <unistd.h>
4579 ],
4580 [
4581 #if _XOPEN_VERSION < 500
4582 #error
4583 #elif _XOPEN_VERSION >= 700 || defined(PATH_MAX)
4584 char *tmp = realpath((const char*)NULL, (char*)NULL);
4585 #else
4586 #error
4587 #endif
4588 ],
4589 [glibcxx_cv_realpath=yes],
4590 [glibcxx_cv_realpath=no])
4591 ])
4592 if test $glibcxx_cv_realpath = yes; then
4593 AC_DEFINE(_GLIBCXX_USE_REALPATH, 1, [Define if usable realpath is available in <stdlib.h>.])
4594 fi
4595 dnl
4596 AC_CACHE_CHECK([for utimensat], glibcxx_cv_utimensat, [dnl
4597 GCC_TRY_COMPILE_OR_LINK(
4598 [
4599 #include <fcntl.h>
4600 #include <sys/stat.h>
4601 ],
4602 [
4603 struct timespec ts[2] = { { 0, UTIME_OMIT }, { 1, 1 } };
4604 int i = utimensat(AT_FDCWD, "path", ts, 0);
4605 ],
4606 [glibcxx_cv_utimensat=yes],
4607 [glibcxx_cv_utimensat=no])
4608 ])
4609 if test $glibcxx_cv_utimensat = yes; then
4610 AC_DEFINE(_GLIBCXX_USE_UTIMENSAT, 1, [Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and AT_FDCWD in <fcntl.h>.])
4611 fi
4612 dnl
4613 AC_CACHE_CHECK([for utime], glibcxx_cv_utime, [dnl
4614 GCC_TRY_COMPILE_OR_LINK(
4615 [
4616 #include <utime.h>
4617 ],
4618 [
4619 struct utimbuf t = { 1, 1 };
4620 int i = utime("path", &t);
4621 ],
4622 [glibcxx_cv_utime=yes],
4623 [glibcxx_cv_utime=no])
4624 ])
4625 if test $glibcxx_cv_utime = yes; then
4626 AC_DEFINE(_GLIBCXX_USE_UTIME, 1, [Define if utime is available in <utime.h>.])
4627 fi
4628 dnl
4629 AC_CACHE_CHECK([for lstat], glibcxx_cv_lstat, [dnl
4630 GCC_TRY_COMPILE_OR_LINK(
4631 [ #include <sys/stat.h> ],
4632 [
4633 struct stat st;
4634 int i = lstat("path", &st);
4635 ],
4636 [glibcxx_cv_lstat=yes],
4637 [glibcxx_cv_lstat=no])
4638 ])
4639 if test $glibcxx_cv_lstat = yes; then
4640 AC_DEFINE(_GLIBCXX_USE_LSTAT, 1, [Define if lstat is available in <sys/stat.h>.])
4641 fi
4642 dnl
4643 AC_CACHE_CHECK([for struct stat.st_mtim.tv_nsec],
4644 glibcxx_cv_st_mtim, [dnl
4645 GCC_TRY_COMPILE_OR_LINK(
4646 [ #include <sys/stat.h> ],
4647 [
4648 struct stat st;
4649 return st.st_mtim.tv_nsec;
4650 ],
4651 [glibcxx_cv_st_mtim=yes],
4652 [glibcxx_cv_st_mtim=no])
4653 ])
4654 if test $glibcxx_cv_st_mtim = yes; then
4655 AC_DEFINE(_GLIBCXX_USE_ST_MTIM, 1, [Define if struct stat has timespec members.])
4656 fi
4657 dnl
4658 AC_CACHE_CHECK([for fchmod],
4659 glibcxx_cv_fchmod, [dnl
4660 GCC_TRY_COMPILE_OR_LINK(
4661 [#include <sys/stat.h>],
4662 [fchmod(1, S_IWUSR);],
4663 [glibcxx_cv_fchmod=yes],
4664 [glibcxx_cv_fchmod=no])
4665 ])
4666 if test $glibcxx_cv_fchmod = yes; then
4667 AC_DEFINE(_GLIBCXX_USE_FCHMOD, 1, [Define if fchmod is available in <sys/stat.h>.])
4668 fi
4669 dnl
4670 AC_CACHE_CHECK([for fchmodat],
4671 glibcxx_cv_fchmodat, [dnl
4672 GCC_TRY_COMPILE_OR_LINK(
4673 [
4674 #include <fcntl.h>
4675 #include <sys/stat.h>
4676 ],
4677 [fchmodat(AT_FDCWD, "", 0, AT_SYMLINK_NOFOLLOW);],
4678 [glibcxx_cv_fchmodat=yes],
4679 [glibcxx_cv_fchmodat=no])
4680 ])
4681 if test $glibcxx_cv_fchmodat = yes; then
4682 AC_DEFINE(_GLIBCXX_USE_FCHMODAT, 1, [Define if fchmodat is available in <sys/stat.h>.])
4683 fi
4684 dnl
4685 AC_CACHE_CHECK([for sendfile that can copy files],
4686 glibcxx_cv_sendfile, [dnl
4687 case "${target_os}" in
4688 gnu* | linux* | solaris* | uclinux*)
4689 GCC_TRY_COMPILE_OR_LINK(
4690 [#include <sys/sendfile.h>],
4691 [sendfile(1, 2, (off_t*)0, sizeof 1);],
4692 [glibcxx_cv_sendfile=yes],
4693 [glibcxx_cv_sendfile=no])
4694 ;;
4695 *)
4696 glibcxx_cv_sendfile=no
4697 ;;
4698 esac
4699 ])
4700 if test $glibcxx_cv_sendfile = yes; then
4701 AC_DEFINE(_GLIBCXX_USE_SENDFILE, 1, [Define if sendfile is available in <sys/sendfile.h>.])
4702 fi
4703 dnl
4704 AC_CACHE_CHECK([for link],
4705 glibcxx_cv_link, [dnl
4706 GCC_TRY_COMPILE_OR_LINK(
4707 [#include <unistd.h>],
4708 [link("", "");],
4709 [glibcxx_cv_link=yes],
4710 [glibcxx_cv_link=no])
4711 ])
4712 if test $glibcxx_cv_link = yes; then
4713 AC_DEFINE(HAVE_LINK, 1, [Define if link is available in <unistd.h>.])
4714 fi
4715 dnl
4716 AC_CACHE_CHECK([for readlink],
4717 glibcxx_cv_readlink, [dnl
4718 GCC_TRY_COMPILE_OR_LINK(
4719 [#include <unistd.h>],
4720 [char buf[32]; readlink("", buf, sizeof(buf));],
4721 [glibcxx_cv_readlink=yes],
4722 [glibcxx_cv_readlink=no])
4723 ])
4724 if test $glibcxx_cv_readlink = yes; then
4725 AC_DEFINE(HAVE_READLINK, 1, [Define if readlink is available in <unistd.h>.])
4726 fi
4727 dnl
4728 AC_CACHE_CHECK([for symlink],
4729 glibcxx_cv_symlink, [dnl
4730 GCC_TRY_COMPILE_OR_LINK(
4731 [#include <unistd.h>],
4732 [symlink("", "");],
4733 [glibcxx_cv_symlink=yes],
4734 [glibcxx_cv_symlink=no])
4735 ])
4736 if test $glibcxx_cv_symlink = yes; then
4737 AC_DEFINE(HAVE_SYMLINK, 1, [Define if symlink is available in <unistd.h>.])
4738 fi
4739 dnl
4740 AC_CACHE_CHECK([for truncate],
4741 glibcxx_cv_truncate, [dnl
4742 GCC_TRY_COMPILE_OR_LINK(
4743 [#include <unistd.h>],
4744 [truncate("", 99);],
4745 [glibcxx_cv_truncate=yes],
4746 [glibcxx_cv_truncate=no])
4747 ])
4748 if test $glibcxx_cv_truncate = yes; then
4749 AC_DEFINE(HAVE_TRUNCATE, 1, [Define if truncate is available in <unistd.h>.])
4750 fi
4751 dnl
4752 AC_CACHE_CHECK([for fdopendir],
4753 glibcxx_cv_fdopendir, [dnl
4754 GCC_TRY_COMPILE_OR_LINK(
4755 [#include <dirent.h>],
4756 [::DIR* dir = ::fdopendir(1);],
4757 [glibcxx_cv_fdopendir=yes],
4758 [glibcxx_cv_fdopendir=no])
4759 ])
4760 if test $glibcxx_cv_fdopendir = yes; then
4761 AC_DEFINE(HAVE_FDOPENDIR, 1, [Define if fdopendir is available in <dirent.h>.])
4762 fi
4763 dnl
4764 AC_CACHE_CHECK([for dirfd],
4765 glibcxx_cv_dirfd, [dnl
4766 GCC_TRY_COMPILE_OR_LINK(
4767 [#include <dirent.h>],
4768 [int fd = ::dirfd((::DIR*)0);],
4769 [glibcxx_cv_dirfd=yes],
4770 [glibcxx_cv_dirfd=no])
4771 ])
4772 if test $glibcxx_cv_dirfd = yes; then
4773 AC_DEFINE(HAVE_DIRFD, 1, [Define if dirfd is available in <dirent.h>.])
4774 fi
4775 dnl
4776 AC_CACHE_CHECK([for openat],
4777 glibcxx_cv_openat, [dnl
4778 GCC_TRY_COMPILE_OR_LINK(
4779 [#include <fcntl.h>],
4780 [int fd = ::openat(AT_FDCWD, "", 0);],
4781 [glibcxx_cv_openat=yes],
4782 [glibcxx_cv_openat=no])
4783 ])
4784 if test $glibcxx_cv_openat = yes; then
4785 AC_DEFINE(HAVE_OPENAT, 1, [Define if openat is available in <fcntl.h>.])
4786 fi
4787 dnl
4788 AC_CACHE_CHECK([for unlinkat],
4789 glibcxx_cv_unlinkat, [dnl
4790 GCC_TRY_COMPILE_OR_LINK(
4791 [#include <fcntl.h>
4792 #include <unistd.h>],
4793 [::unlinkat(AT_FDCWD, "", AT_REMOVEDIR);],
4794 [glibcxx_cv_unlinkat=yes],
4795 [glibcxx_cv_unlinkat=no])
4796 ])
4797 if test $glibcxx_cv_unlinkat = yes; then
4798 AC_DEFINE(HAVE_UNLINKAT, 1, [Define if unlinkat is available in <fcntl.h>.])
4799 fi
4800 dnl
4801 CXXFLAGS="$ac_save_CXXFLAGS"
4802 AC_LANG_RESTORE
4803 ])
4805 dnl
4806 dnl Check how size_t is mangled. Copied from libitm.
4807 dnl
4808 AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
4809 AC_CACHE_CHECK([how size_t is mangled],
4810 glibcxx_cv_size_t_mangling, [
4811 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
4812 [glibcxx_cv_size_t_mangling=m], [
4813 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
4814 [glibcxx_cv_size_t_mangling=j], [
4815 AC_TRY_COMPILE([],
4816 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
4817 [glibcxx_cv_size_t_mangling=y], [
4818 AC_TRY_COMPILE([],
4819 [extern __SIZE_TYPE__ x; extern unsigned short x;],
4820 [glibcxx_cv_size_t_mangling=t], [
4821 AC_TRY_COMPILE([],
4822 [extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
4823 [glibcxx_cv_size_t_mangling=u6uint20],
4824 [glibcxx_cv_size_t_mangling=x])
4825 ])
4826 ])
4827 ])
4828 ])
4829 ])
4830 if test $glibcxx_cv_size_t_mangling = x; then
4831 AC_MSG_ERROR([Unknown underlying type for size_t])
4832 fi
4833 AC_DEFINE_UNQUOTED(_GLIBCXX_MANGLE_SIZE_T, [$glibcxx_cv_size_t_mangling],
4834 [Define to the letter to which size_t is mangled.])
4835 ])
4837 dnl
4838 dnl Determine whether std::exception_ptr symbols should be exported with
4839 dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
4840 dnl release first added support for std::exception_ptr. Originally it was
4841 dnl only supported for targets with always-lock-free atomics for int, but
4842 dnl since GCC 7.1 it is supported for all targets.
4843 dnl
4844 AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
4845 if test $enable_symvers != no; then
4846 AC_MSG_CHECKING([for first version to support std::exception_ptr])
4847 case ${target} in
4848 aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
4849 m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
4850 ac_exception_ptr_since_gcc46=yes
4851 ;;
4852 *)
4853 # If the value of this macro changes then we will need to hardcode
4854 # yes/no here for additional targets based on the original value.
4855 AC_TRY_COMPILE([], [
4856 #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
4857 # error atomic int not always lock free
4858 #endif
4859 ],
4860 [ac_exception_ptr_since_gcc46=yes],
4861 [ac_exception_ptr_since_gcc46=no])
4862 ;;
4863 esac
4864 if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
4865 AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
4866 [Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
4867 AC_MSG_RESULT([4.6.0])
4868 else
4869 AC_MSG_RESULT([7.1.0])
4870 fi
4871 fi
4872 ])
4874 dnl
4875 dnl Check whether getentropy is present in <unistd.h>.
4876 dnl
4877 AC_DEFUN([GLIBCXX_CHECK_GETENTROPY], [
4879 AC_LANG_SAVE
4880 AC_LANG_CPLUSPLUS
4881 AC_CACHE_CHECK([for getentropy], glibcxx_cv_getentropy, [
4882 GCC_TRY_COMPILE_OR_LINK(
4883 [#include <unistd.h>],
4884 [unsigned i;
4885 ::getentropy(&i, sizeof(i));],
4886 [glibcxx_cv_getentropy=yes], [glibcxx_cv_getentropy=no])
4887 ])
4889 if test $glibcxx_cv_getentropy = yes; then
4890 AC_DEFINE(HAVE_GETENTROPY, 1, [Define if getentropy is available in <unistd.h>.])
4891 fi
4892 AC_LANG_RESTORE
4893 ])
4895 dnl
4896 dnl Check whether arc4random is present in <stdlib.h>.
4897 dnl
4898 AC_DEFUN([GLIBCXX_CHECK_ARC4RANDOM], [
4900 AC_LANG_SAVE
4901 AC_LANG_CPLUSPLUS
4902 AC_CACHE_CHECK([for arc4random], glibcxx_cv_arc4random, [
4903 GCC_TRY_COMPILE_OR_LINK(
4904 [#include <stdlib.h>],
4905 [unsigned i = ::arc4random();],
4906 [glibcxx_cv_arc4random=yes], [glibcxx_cv_arc4random=no])
4907 ])
4909 if test $glibcxx_cv_arc4random = yes; then
4910 AC_DEFINE(HAVE_ARC4RANDOM, 1, [Define if arc4random is available in <stdlib.h>.])
4911 fi
4912 AC_LANG_RESTORE
4913 ])
4915 dnl
4916 dnl Check to see whether to build libstdc++_libbacktrace.a
4917 dnl
4918 dnl --enable-libstdcxx-backtrace
4919 dnl
4920 AC_DEFUN([GLIBCXX_ENABLE_BACKTRACE], [
4921 GLIBCXX_ENABLE(libstdcxx-backtrace,auto,,
4922 [turns on libbacktrace support],
4923 [permit yes|no|auto])
4925 # Most of this is adapted from libsanitizer/configure.ac
4927 BACKTRACE_CPPFLAGS=
4929 # libbacktrace only needs atomics for int, which we've already tested
4930 if test "$glibcxx_cv_atomic_int" = "yes"; then
4931 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_ATOMIC_FUNCTIONS=1"
4932 fi
4934 # Test for __sync support.
4935 AC_CACHE_CHECK([__sync extensions],
4936 [glibcxx_cv_sys_sync],
4937 [GCC_TRY_COMPILE_OR_LINK(
4938 [int i;],
4939 [__sync_bool_compare_and_swap (&i, i, i);
4940 __sync_lock_test_and_set (&i, 1);
4941 __sync_lock_release (&i);],
4942 [glibcxx_cv_sys_sync=yes],
4943 [glibcxx_cv_sys_sync=no])
4944 ])
4945 if test "$glibcxx_cv_sys_sync" = "yes"; then
4946 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_SYNC_FUNCTIONS=1"
4947 fi
4949 # Check for dl_iterate_phdr.
4950 AC_CHECK_HEADERS(link.h)
4951 if test "$ac_cv_header_link_h" = "no"; then
4952 have_dl_iterate_phdr=no
4953 else
4954 # When built as a GCC target library, we can't do a link test.
4955 AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
4956 [have_dl_iterate_phdr=no])
4957 fi
4958 if test "$have_dl_iterate_phdr" = "yes"; then
4959 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_DL_ITERATE_PHDR=1"
4960 fi
4962 # Check for the fcntl function.
4963 if test -n "${with_target_subdir}"; then
4964 case "${host}" in
4965 *-*-mingw*) have_fcntl=no ;;
4966 *) have_fcntl=yes ;;
4967 esac
4968 else
4969 AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
4970 fi
4971 if test "$have_fcntl" = "yes"; then
4972 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_FCNTL=1"
4973 fi
4975 AC_CHECK_DECLS(strnlen)
4977 # Check for getexecname function.
4978 if test -n "${with_target_subdir}"; then
4979 case "${host}" in
4980 *-*-solaris2*) have_getexecname=yes ;;
4981 *) have_getexecname=no ;;
4982 esac
4983 else
4984 AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no])
4985 fi
4986 if test "$have_getexecname" = "yes"; then
4987 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_GETEXECNAME=1"
4988 fi
4990 # The library needs to be able to read the executable itself. Compile
4991 # a file to determine the executable format. The awk script
4992 # filetype.awk prints out the file type.
4993 AC_CACHE_CHECK([output filetype],
4994 [glibcxx_cv_sys_filetype],
4995 [filetype=
4996 AC_COMPILE_IFELSE(
4997 [AC_LANG_PROGRAM([int i;], [int j;])],
4998 [filetype=`${AWK} -f $srcdir/../libbacktrace/filetype.awk conftest.$ac_objext`],
4999 [AC_MSG_FAILURE([compiler failed])])
5000 glibcxx_cv_sys_filetype=$filetype])
5002 # Match the file type to decide what files to compile.
5003 FORMAT_FILE=
5004 case "$glibcxx_cv_sys_filetype" in
5005 elf*) FORMAT_FILE="elf.lo" ;;
5006 *) AC_MSG_WARN([could not determine output file type])
5007 FORMAT_FILE="unknown.lo"
5008 enable_libstdcxx_backtrace=no
5009 ;;
5010 esac
5011 AC_SUBST(FORMAT_FILE)
5013 # ELF defines.
5014 elfsize=
5015 case "$glibcxx_cv_sys_filetype" in
5016 elf32) elfsize=32 ;;
5017 elf64) elfsize=64 ;;
5018 esac
5019 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
5021 AC_MSG_CHECKING([whether to build libbacktrace support])
5022 if test "$enable_libstdcxx_backtrace" = "auto"; then
5023 enable_libstdcxx_backtrace=no
5024 fi
5025 if test "$enable_libstdcxx_backtrace" = "yes"; then
5026 BACKTRACE_SUPPORTED=1
5028 AC_CHECK_HEADERS(sys/mman.h)
5029 case "${host}" in
5030 *-*-msdosdjgpp) # DJGPP has sys/man.h, but no mmap
5031 have_mmap=no ;;
5032 *-*-*)
5033 have_mmap="$ac_cv_header_sys_mman_h" ;;
5034 esac
5036 if test "$have_mmap" = "no"; then
5037 VIEW_FILE=read.lo
5038 ALLOC_FILE=alloc.lo
5039 else
5040 VIEW_FILE=mmapio.lo
5041 AC_PREPROC_IFELSE([AC_LANG_SOURCE([
5042 #include <sys/mman.h>
5043 #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
5044 #error no MAP_ANONYMOUS
5045 #endif
5046 ])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
5047 fi
5048 AC_SUBST(VIEW_FILE)
5049 AC_SUBST(ALLOC_FILE)
5051 BACKTRACE_USES_MALLOC=0
5052 if test "$ALLOC_FILE" = "alloc.lo"; then
5053 BACKTRACE_USES_MALLOC=1
5054 fi
5056 if test "$ac_has_gthreads" = "yes"; then
5057 BACKTRACE_SUPPORTS_THREADS=1
5058 else
5059 BACKTRACE_SUPPORTS_THREADS=0
5060 fi
5061 AC_SUBST(BACKTRACE_CPPFLAGS)
5062 AC_SUBST(BACKTRACE_SUPPORTED)
5063 AC_SUBST(BACKTRACE_USES_MALLOC)
5064 AC_SUBST(BACKTRACE_SUPPORTS_THREADS)
5065 AC_DEFINE(HAVE_STACKTRACE, 1, [Define if the <stacktrace> header is supported.])
5066 else
5067 BACKTRACE_SUPPORTED=0
5068 BACKTRACE_USES_MALLOC=0
5069 BACKTRACE_SUPPORTS_THREADS=0
5070 fi
5071 AC_MSG_RESULT($enable_libstdcxx_backtrace)
5072 GLIBCXX_CONDITIONAL(ENABLE_BACKTRACE, [test "$enable_libstdcxx_backtrace" = yes])
5073 ])
5075 # Macros from the top-level gcc directory.
5076 m4_include([../config/gc++filt.m4])
5077 m4_include([../config/tls.m4])
5078 m4_include([../config/gthr.m4])
5079 m4_include([../config/cet.m4])