| blob | 90ecc4a87a2531cf8cb6c96afd34cac1251d4155 |
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 $host.
32 dnl
33 dnl Sets:
34 dnl SUBDIRS
35 dnl Substs:
36 dnl glibcxx_builddir (absolute path)
37 dnl glibcxx_srcdir (absolute path)
38 dnl toplevel_builddir (absolute path)
39 dnl toplevel_srcdir (absolute path)
40 dnl with_cross_host
41 dnl with_newlib
42 dnl with_target_subdir
43 dnl plus
44 dnl - the variables in GLIBCXX_CHECK_HOST / configure.host
45 dnl - default settings for all AM_CONFITIONAL test variables
46 dnl - lots of tools, like CC and CXX
47 dnl
48 AC_DEFUN([GLIBCXX_CONFIGURE], [
49 # Keep these sync'd with the list in Makefile.am. The first provides an
50 # expandable list at autoconf time; the second provides an expandable list
51 # (i.e., shell variable) at configure time.
52 m4_define([glibcxx_SUBDIRS],[include libsupc++ src src/c++98 src/c++11 src/c++17 src/c++20 src/filesystem doc po testsuite python])
53 SUBDIRS='glibcxx_SUBDIRS'
55 # These need to be absolute paths, yet at the same time need to
56 # canonicalize only relative paths, because then amd will not unmount
57 # drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
58 glibcxx_builddir=`${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_gnu_ld_version (possibly)
176 dnl
177 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
178 dnl set glibcxx_gnu_ld_version to 12345. Zeros cause problems.
179 dnl
180 AC_DEFUN([GLIBCXX_CHECK_LINKER_FEATURES], [
181 # If we're not using GNU ld, then there's no point in even trying these
182 # tests. Check for that first. We should have already tested for gld
183 # by now (in libtool), but require it now just to be safe...
184 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
185 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
186 AC_REQUIRE([AC_PROG_LD])
187 AC_REQUIRE([AC_PROG_AWK])
189 # The name set by libtool depends on the version of libtool. Shame on us
190 # for depending on an impl detail, but c'est la vie. Older versions used
191 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
192 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
193 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
194 # set (hence we're using an older libtool), then set it.
195 if test x${with_gnu_ld+set} != xset; then
196 if test x${ac_cv_prog_gnu_ld+set} != xset; then
197 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
198 with_gnu_ld=no
199 else
200 with_gnu_ld=$ac_cv_prog_gnu_ld
201 fi
202 fi
204 # Start by getting the version number. I think the libtool test already
205 # does some of this, but throws away the result.
206 glibcxx_ld_is_gold=no
207 if test x"$with_gnu_ld" = x"yes"; then
208 AC_MSG_CHECKING([for ld version])
209 changequote(,)
210 if $LD --version 2>/dev/null | grep 'GNU gold' >/dev/null 2>&1; then
211 glibcxx_ld_is_gold=yes
212 fi
213 ldver=`$LD --version 2>/dev/null |
214 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
215 changequote([,])
216 glibcxx_gnu_ld_version=`echo $ldver | \
217 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
218 AC_MSG_RESULT($glibcxx_gnu_ld_version)
219 fi
221 # Set --gc-sections.
222 glibcxx_have_gc_sections=no
223 if test "$glibcxx_ld_is_gold" = "yes"; then
224 if $LD --help 2>/dev/null | grep gc-sections >/dev/null 2>&1; then
225 glibcxx_have_gc_sections=yes
226 fi
227 else
228 glibcxx_gcsections_min_ld=21602
229 if test x"$with_gnu_ld" = x"yes" &&
230 test $glibcxx_gnu_ld_version -gt $glibcxx_gcsections_min_ld ; then
231 glibcxx_have_gc_sections=yes
232 fi
233 fi
234 if test "$glibcxx_have_gc_sections" = "yes"; then
235 # Sufficiently young GNU ld it is! Joy and bunny rabbits!
236 # NB: This flag only works reliably after 2.16.1. Configure tests
237 # for this are difficult, so hard wire a value that should work.
239 ac_test_CFLAGS="${CFLAGS+set}"
240 ac_save_CFLAGS="$CFLAGS"
241 CFLAGS='-Wl,--gc-sections'
243 # Check for -Wl,--gc-sections
244 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
245 AC_TRY_LINK([ int one(void) { return 1; }
246 int two(void) { return 2; }
247 ], [ two(); ] , [ac_gcsections=yes], [ac_gcsections=no])
248 if test "$ac_gcsections" = "yes"; then
249 rm -f conftest.c
250 touch conftest.c
251 if $CC -c conftest.c; then
252 if $LD --gc-sections -o conftest conftest.o 2>&1 | \
253 grep "Warning: gc-sections option ignored" > /dev/null; then
254 ac_gcsections=no
255 fi
256 fi
257 rm -f conftest.c conftest.o conftest
258 fi
259 if test "$ac_gcsections" = "yes"; then
260 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
261 fi
262 AC_MSG_RESULT($ac_gcsections)
264 if test "$ac_test_CFLAGS" = set; then
265 CFLAGS="$ac_save_CFLAGS"
266 else
267 # this is the suspicious part
268 CFLAGS=''
269 fi
270 fi
272 # Set -z,relro.
273 # Note this is only for shared objects.
274 ac_ld_relro=no
275 if test x"$with_gnu_ld" = x"yes"; then
276 # cygwin and mingw uses PE, which has no ELF relro support,
277 # multi target ld may confuse configure machinery
278 case "$host" in
279 *-*-cygwin*)
280 ;;
281 *-*-mingw*)
282 ;;
283 *)
284 AC_MSG_CHECKING([for ld that supports -Wl,-z,relro])
285 cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
286 if test -n "$cxx_z_relo"; then
287 OPT_LDFLAGS="-Wl,-z,relro"
288 ac_ld_relro=yes
289 fi
290 AC_MSG_RESULT($ac_ld_relro)
291 esac
292 fi
294 # Set linker optimization flags.
295 if test x"$with_gnu_ld" = x"yes"; then
296 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
297 fi
299 AC_SUBST(SECTION_LDFLAGS)
300 AC_SUBST(OPT_LDFLAGS)
301 ])
304 dnl
305 dnl Check for headers for, and arguments to, the setrlimit() function.
306 dnl Used only in testsuite_hooks.h. Called from GLIBCXX_CONFIGURE_TESTSUITE.
307 dnl
308 dnl Defines:
309 dnl _GLIBCXX_RES_LIMITS if we can set artificial resource limits
310 dnl various HAVE_LIMIT_* for individual limit names
311 dnl
312 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT_ancilliary], [
313 AC_MSG_CHECKING([for RLIMIT_$1])
314 AC_TRY_COMPILE(
315 [#include <unistd.h>
316 #include <sys/time.h>
317 #include <sys/resource.h>
318 ],
319 [ int f = RLIMIT_$1 ; ],
320 [glibcxx_mresult=1], [glibcxx_mresult=0])
321 AC_DEFINE_UNQUOTED(HAVE_LIMIT_$1, $glibcxx_mresult,
322 [Only used in build directory testsuite_hooks.h.])
323 if test $glibcxx_mresult = 1 ; then res=yes ; else res=no ; fi
324 AC_MSG_RESULT($res)
325 ])
327 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT], [
328 AC_LANG_SAVE
329 AC_LANG_CPLUSPLUS
330 setrlimit_have_headers=yes
331 AC_CHECK_HEADERS(unistd.h sys/time.h sys/resource.h,
332 [],
333 [setrlimit_have_headers=no])
334 # If don't have the headers, then we can't run the tests now, and we
335 # won't be seeing any of these during testsuite compilation.
336 if test $setrlimit_have_headers = yes; then
337 # Can't do these in a loop, else the resulting syntax is wrong.
338 GLIBCXX_CHECK_SETRLIMIT_ancilliary(DATA)
339 GLIBCXX_CHECK_SETRLIMIT_ancilliary(RSS)
340 GLIBCXX_CHECK_SETRLIMIT_ancilliary(VMEM)
341 GLIBCXX_CHECK_SETRLIMIT_ancilliary(AS)
342 GLIBCXX_CHECK_SETRLIMIT_ancilliary(FSIZE)
344 # Check for rlimit, setrlimit.
345 AC_CACHE_VAL(glibcxx_cv_setrlimit, [
346 AC_TRY_COMPILE(
347 [#include <unistd.h>
348 #include <sys/time.h>
349 #include <sys/resource.h>
350 ],
351 [struct rlimit r;
352 setrlimit(0, &r);],
353 [glibcxx_cv_setrlimit=yes], [glibcxx_cv_setrlimit=no])
354 ])
355 fi
357 AC_MSG_CHECKING([for testsuite resource limits support])
358 if test $setrlimit_have_headers = yes && test $glibcxx_cv_setrlimit = yes; then
359 ac_res_limits=yes
360 AC_DEFINE(_GLIBCXX_RES_LIMITS, 1,
361 [Define if using setrlimit to set resource limits during
362 "make check"])
363 else
364 ac_res_limits=no
365 fi
366 AC_LANG_RESTORE
367 AC_MSG_RESULT($ac_res_limits)
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_MSG_CHECKING([for poll])
429 AC_CACHE_VAL(glibcxx_cv_POLL, [
430 GCC_TRY_COMPILE_OR_LINK(
431 [#include <poll.h>],
432 [struct pollfd pfd[1];
433 pfd[0].events = POLLIN;
434 poll(pfd, 1, 0);],
435 [glibcxx_cv_POLL=yes],
436 [glibcxx_cv_POLL=no])
437 ])
438 if test $glibcxx_cv_POLL = yes; then
439 AC_DEFINE(HAVE_POLL, 1, [Define if poll is available in <poll.h>.])
440 fi
441 AC_MSG_RESULT($glibcxx_cv_POLL)
443 CXXFLAGS="$ac_save_CXXFLAGS"
444 AC_LANG_RESTORE
445 ])
448 dnl
449 dnl Check whether writev is available in <sys/uio.h>, and define HAVE_WRITEV.
450 dnl
451 AC_DEFUN([GLIBCXX_CHECK_WRITEV], [
453 AC_LANG_SAVE
454 AC_LANG_CPLUSPLUS
455 ac_save_CXXFLAGS="$CXXFLAGS"
456 CXXFLAGS="$CXXFLAGS -fno-exceptions"
458 AC_MSG_CHECKING([for writev])
459 AC_CACHE_VAL(glibcxx_cv_WRITEV, [
460 GCC_TRY_COMPILE_OR_LINK(
461 [#include <sys/uio.h>],
462 [struct iovec iov[2];
463 writev(0, iov, 0);],
464 [glibcxx_cv_WRITEV=yes],
465 [glibcxx_cv_WRITEV=no])
466 ])
467 if test $glibcxx_cv_WRITEV = yes; then
468 AC_DEFINE(HAVE_WRITEV, 1, [Define if writev is available in <sys/uio.h>.])
469 fi
470 AC_MSG_RESULT($glibcxx_cv_WRITEV)
472 CXXFLAGS="$ac_save_CXXFLAGS"
473 AC_LANG_RESTORE
474 ])
477 dnl
478 dnl Check whether LFS support is available.
479 dnl
480 AC_DEFUN([GLIBCXX_CHECK_LFS], [
481 AC_LANG_SAVE
482 AC_LANG_CPLUSPLUS
483 ac_save_CXXFLAGS="$CXXFLAGS"
484 CXXFLAGS="$CXXFLAGS -fno-exceptions"
485 AC_MSG_CHECKING([for LFS support])
486 AC_CACHE_VAL(glibcxx_cv_LFS, [
487 GCC_TRY_COMPILE_OR_LINK(
488 [#include <unistd.h>
489 #include <stdio.h>
490 #include <sys/stat.h>
491 ],
492 [FILE* fp;
493 fopen64("t", "w");
494 fseeko64(fp, 0, SEEK_CUR);
495 ftello64(fp);
496 lseek64(1, 0, SEEK_CUR);
497 struct stat64 buf;
498 fstat64(1, &buf);],
499 [glibcxx_cv_LFS=yes],
500 [glibcxx_cv_LFS=no])
501 ])
502 if test $glibcxx_cv_LFS = yes; then
503 AC_DEFINE(_GLIBCXX_USE_LFS, 1, [Define if LFS support is available.])
504 fi
505 AC_MSG_RESULT($glibcxx_cv_LFS)
506 CXXFLAGS="$ac_save_CXXFLAGS"
507 AC_LANG_RESTORE
508 ])
511 dnl
512 dnl Check for whether a fully dynamic basic_string implementation should
513 dnl be turned on, that does not put empty objects in per-process static
514 dnl memory (mostly useful together with shared memory allocators, see PR
515 dnl libstdc++/16612 for details).
516 dnl
517 dnl --enable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 1
518 dnl --disable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 0
519 dnl otherwise undefined
520 dnl + Usage: GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING[(DEFAULT)]
521 dnl Where DEFAULT is either `yes' or `no'.
522 dnl
523 AC_DEFUN([GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING], [
524 GLIBCXX_ENABLE(fully-dynamic-string,$1,,[do not put empty strings in per-process static memory])
525 if test $enable_fully_dynamic_string = yes; then
526 enable_fully_dynamic_string_def=1
527 else
528 enable_fully_dynamic_string_def=0
529 fi
530 AC_DEFINE_UNQUOTED([_GLIBCXX_FULLY_DYNAMIC_STRING], [${enable_fully_dynamic_string_def}],
531 [Define to 1 if a fully dynamic basic_string is wanted, 0 to disable, undefined for platform defaults])
532 ])
535 dnl
536 dnl Does any necessary configuration of the testsuite directory. Generates
537 dnl the testsuite_hooks.h header.
538 dnl
539 dnl GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE must be done before this.
540 dnl
541 dnl Sets:
542 dnl enable_abi_check
543 dnl GLIBCXX_TEST_WCHAR_T
544 dnl GLIBCXX_TEST_THREAD
545 dnl Substs:
546 dnl baseline_dir
547 dnl baseline_subdir_switch
548 dnl
549 AC_DEFUN([GLIBCXX_CONFIGURE_TESTSUITE], [
550 # Do checks for resource limit functions.
551 GLIBCXX_CHECK_SETRLIMIT
553 if $GLIBCXX_IS_NATIVE ; then
554 # Look for setenv, so that extended locale tests can be performed.
555 GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_3(setenv)
556 fi
558 if $GLIBCXX_IS_NATIVE && test $is_hosted = yes &&
559 test $enable_symvers != no; then
560 case "$host" in
561 *-*-cygwin*)
562 enable_abi_check=no ;;
563 *)
564 enable_abi_check=yes ;;
565 esac
566 else
567 # Only build this as native, since automake does not understand
568 # CXX_FOR_BUILD.
569 enable_abi_check=no
570 fi
572 # Export file names for ABI checking.
573 baseline_dir="$glibcxx_srcdir/config/abi/post/${abi_baseline_pair}"
574 AC_SUBST(baseline_dir)
575 baseline_subdir_switch="$abi_baseline_subdir_switch"
576 AC_SUBST(baseline_subdir_switch)
577 ])
580 dnl
581 dnl Does any necessary configuration for docbook in the docs directory.
582 dnl
583 dnl XSLTPROC must be set before this
584 dnl
585 dnl Sets:
586 dnl glibcxx_stylesheets
587 dnl Substs:
588 dnl XSL_STYLE_DIR
589 dnl
590 AC_DEFUN([GLIBCXX_CONFIGURE_DOCBOOK], [
592 glibcxx_docbook_url=http://docbook.sourceforge.net/release/xsl-ns/current/
594 AC_MSG_CHECKING([for local stylesheet directory])
595 glibcxx_local_stylesheets=no
596 if test x${XMLCATALOG} = xyes && xsl_style_dir=`xmlcatalog "" $glibcxx_docbook_url 2>/dev/null`
597 then
598 XSL_STYLE_DIR=`echo $xsl_style_dir | sed -n 's;^file://;;p'`
599 glibcxx_local_stylesheets=yes
600 else
601 for dir in \
602 /usr/share/sgml/docbook/xsl-ns-stylesheets \
603 /usr/share/xml/docbook/stylesheet/docbook-xsl-ns \
604 /usr/share/xml/docbook/stylesheet/nwalsh5/current \
605 /usr/share/xml/docbook/stylesheet/nwalsh/current
606 do
607 if test -d $dir; then
608 glibcxx_local_stylesheets=yes
609 XSL_STYLE_DIR=$dir
610 break
611 fi
612 done
613 fi
614 AC_MSG_RESULT($glibcxx_local_stylesheets)
616 if test x"$glibcxx_local_stylesheets" = x"yes"; then
617 AC_SUBST(XSL_STYLE_DIR)
618 AC_MSG_NOTICE($XSL_STYLE_DIR)
620 AC_MSG_CHECKING([for docbook stylesheets for documentation creation])
621 glibcxx_stylesheets=no
622 if test x${XMLCATALOG} = xno || xmlcatalog "" $glibcxx_docbook_url/xhtml/docbook.xsl >/dev/null 2>&1; then
623 if test x${XSLTPROC} = xyes && echo '<title/>' | xsltproc --noout --nonet --xinclude $glibcxx_docbook_url/xhtml/docbook.xsl - 2>/dev/null; then
624 glibcxx_stylesheets=yes
625 fi
626 fi
627 AC_MSG_RESULT($glibcxx_stylesheets)
629 else
630 glibcxx_stylesheets=no
631 fi
633 # Check for epub3 dependencies.
634 AC_MSG_CHECKING([for epub3 stylesheets for documentation creation])
635 glibcxx_epub_stylesheets=no
636 if test x"$glibcxx_local_stylesheets" = x"yes"; then
637 if test -f "$XSL_STYLE_DIR/epub3/chunk.xsl"; then
638 glibcxx_epub_stylesheets=yes
639 fi
640 fi
641 AC_MSG_RESULT($glibcxx_epub_stylesheets)
642 AM_CONDITIONAL(BUILD_EPUB, test x"$glibcxx_epub_stylesheets" = x"yes")
644 ])
647 dnl
648 dnl Set up *_INCLUDES variables for all sundry Makefile.am's.
649 dnl
650 dnl Substs:
651 dnl GLIBCXX_INCLUDES
652 dnl TOPLEVEL_INCLUDES
653 dnl
654 AC_DEFUN([GLIBCXX_EXPORT_INCLUDES], [
655 # Used for every C++ compile we perform.
656 GLIBCXX_INCLUDES="\
657 -I$glibcxx_builddir/include/$host_alias \
658 -I$glibcxx_builddir/include \
659 -I$glibcxx_srcdir/libsupc++"
661 # For Canadian crosses, pick this up too.
662 if test $CANADIAN = yes; then
663 GLIBCXX_INCLUDES="$GLIBCXX_INCLUDES -I\${includedir}"
664 fi
666 # Stuff in the actual top level. Currently only used by libsupc++ to
667 # get unwind* headers from the libgcc dir.
668 #TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc -I$(toplevel_srcdir)/include'
669 TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc'
671 # Now, export this to all the little Makefiles....
672 AC_SUBST(GLIBCXX_INCLUDES)
673 AC_SUBST(TOPLEVEL_INCLUDES)
674 ])
677 dnl
678 dnl Set up *_FLAGS and *FLAGS variables for all sundry Makefile.am's.
679 dnl (SECTION_FLAGS is done under CHECK_COMPILER_FEATURES.)
680 dnl
681 dnl Substs:
682 dnl OPTIMIZE_CXXFLAGS
683 dnl WARN_FLAGS
684 dnl
685 AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
686 # Optimization flags that are probably a good idea for thrill-seekers. Just
687 # uncomment the lines below and make, everything else is ready to go...
688 # Alternatively OPTIMIZE_CXXFLAGS can be set in configure.host.
689 # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
690 AC_SUBST(OPTIMIZE_CXXFLAGS)
692 WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
693 AC_SUBST(WARN_FLAGS)
694 ])
697 dnl
698 dnl All installation directory information is determined here.
699 dnl
700 dnl Substs:
701 dnl gxx_install_dir
702 dnl glibcxx_prefixdir
703 dnl glibcxx_toolexecdir
704 dnl glibcxx_toolexeclibdir
705 dnl
706 dnl Assumes cross_compiling bits already done, and with_cross_host in
707 dnl particular.
708 dnl
709 dnl This logic must match gcc/configure.ac's setting of gcc_gxx_include_dir.
710 dnl config/gxx-include-dir.m4 must be kept consistant with this as well.
711 AC_DEFUN([GLIBCXX_EXPORT_INSTALL_INFO], [
712 glibcxx_toolexecdir=no
713 glibcxx_toolexeclibdir=no
714 glibcxx_prefixdir=$prefix
716 AC_MSG_CHECKING([for gxx-include-dir])
717 AC_ARG_WITH([gxx-include-dir],
718 AC_HELP_STRING([--with-gxx-include-dir=DIR],
719 [installation directory for include files]),
720 [case "$withval" in
721 yes) AC_MSG_ERROR([Missing directory for --with-gxx-include-dir]) ;;
722 no) gxx_include_dir=no ;;
723 *) gxx_include_dir=$withval ;;
724 esac],
725 [gxx_include_dir=no])
726 AC_MSG_RESULT($gxx_include_dir)
728 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
729 AC_ARG_ENABLE([version-specific-runtime-libs],
730 AC_HELP_STRING([--enable-version-specific-runtime-libs],
731 [Specify that runtime libraries should be installed in a compiler-specific directory]),
732 [case "$enableval" in
733 yes) version_specific_libs=yes ;;
734 no) version_specific_libs=no ;;
735 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
736 esac],
737 [version_specific_libs=no])
738 AC_MSG_RESULT($version_specific_libs)
740 GCC_WITH_TOOLEXECLIBDIR
742 # Default case for install directory for include files.
743 if test $version_specific_libs = no && test $gxx_include_dir = no; then
744 gxx_include_dir='include/c++/${gcc_version}'
745 if test -n "$with_cross_host" &&
746 test x"$with_cross_host" != x"no"; then
747 gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"
748 else
749 gxx_include_dir='${prefix}/'"$gxx_include_dir"
750 fi
751 fi
753 # Version-specific runtime libs processing.
754 if test $version_specific_libs = yes; then
755 # Need the gcc compiler version to know where to install libraries
756 # and header files if --enable-version-specific-runtime-libs option
757 # is selected. FIXME: these variables are misnamed, there are
758 # no executables installed in _toolexecdir or _toolexeclibdir.
759 if test x"$gxx_include_dir" = x"no"; then
760 gxx_include_dir='${libdir}/gcc/${host_alias}/${gcc_version}/include/c++'
761 fi
762 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
763 glibcxx_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
764 fi
766 # Calculate glibcxx_toolexecdir, glibcxx_toolexeclibdir
767 # Install a library built with a cross compiler in tooldir, not libdir.
768 if test x"$glibcxx_toolexecdir" = x"no"; then
769 if test -n "$with_cross_host" &&
770 test x"$with_cross_host" != x"no"; then
771 glibcxx_toolexecdir='${exec_prefix}/${host_alias}'
772 case ${with_toolexeclibdir} in
773 no)
774 glibcxx_toolexeclibdir='${toolexecdir}/lib'
775 ;;
776 *)
777 glibcxx_toolexeclibdir=${with_toolexeclibdir}
778 ;;
779 esac
780 else
781 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
782 glibcxx_toolexeclibdir='${libdir}'
783 fi
784 multi_os_directory=`$CXX -print-multi-os-directory`
785 case $multi_os_directory in
786 .) ;; # Avoid trailing /.
787 *) glibcxx_toolexeclibdir=$glibcxx_toolexeclibdir/$multi_os_directory ;;
788 esac
789 fi
791 AC_MSG_CHECKING([for install location])
792 AC_MSG_RESULT($gxx_include_dir)
794 AC_SUBST(glibcxx_prefixdir)
795 AC_SUBST(gxx_include_dir)
796 AC_SUBST(glibcxx_toolexecdir)
797 AC_SUBST(glibcxx_toolexeclibdir)
798 ])
801 dnl
802 dnl GLIBCXX_ENABLE
803 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
804 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
805 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
806 dnl
807 dnl See manual/appendix_porting.html#appendix.porting.build_hacking for
808 dnl documentation.
809 dnl
810 m4_define([GLIBCXX_ENABLE],[dnl
811 m4_define([_g_switch],[--enable-$1])dnl
812 m4_define([_g_help],[AC_HELP_STRING([_g_switch$3],[$4 @<:@default=$2@:>@])])dnl
813 AC_ARG_ENABLE([$1],m4_dquote(_g_help),
814 m4_bmatch([$5],
815 [^permit ],
816 [[
817 case "$enableval" in
818 m4_bpatsubst([$5],[permit ])) ;;
819 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
820 dnl Idea for future: generate a URL pointing to
821 dnl "onlinedocs/configopts.html#whatever"
822 esac
823 ]],
824 [^$],
825 [[
826 case "$enableval" in
827 yes|no) ;;
828 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
829 esac
830 ]],
831 [[$5]]),
832 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
833 m4_undefine([_g_switch])dnl
834 m4_undefine([_g_help])dnl
835 ])
838 dnl
839 dnl Check for ISO/IEC 9899:1999 "C99" support.
840 dnl
841 dnl --enable-c99 defines _GLIBCXX_USE_C99
842 dnl --disable-c99 leaves _GLIBCXX_USE_C99 undefined
843 dnl + Usage: GLIBCXX_ENABLE_C99[(DEFAULT)]
844 dnl Where DEFAULT is either `yes' or `no'.
845 dnl + If 'C99' stuff is not available, ignores DEFAULT and sets `no'.
846 dnl
847 AC_DEFUN([GLIBCXX_ENABLE_C99], [
848 GLIBCXX_ENABLE(c99,$1,,[turns on ISO/IEC 9899:1999 support])
850 if test x"$enable_c99" = x"yes"; then
851 AC_LANG_SAVE
852 AC_LANG_CPLUSPLUS
854 # Use -std=c++98 (instead of -std=gnu++98) because leaving __STRICT_ANSI__
855 # undefined may cause fake C99 facilities, like pre-standard snprintf,
856 # to be spuriously enabled.
857 ac_save_CXXFLAGS="$CXXFLAGS"
858 CXXFLAGS="$CXXFLAGS -std=c++98"
859 ac_save_LIBS="$LIBS"
860 ac_save_gcc_no_link="$gcc_no_link"
862 if test x$gcc_no_link != xyes; then
863 # Use -fno-exceptions to that the C driver can link these tests without
864 # hitting undefined references to personality routines.
865 CXXFLAGS="$CXXFLAGS -fno-exceptions"
866 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
867 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
868 gcc_no_link=yes
869 ])
870 fi
872 # Check for the existence of <math.h> functions used if C99 is enabled.
873 AC_MSG_CHECKING([for ISO C99 support in <math.h> for C++98])
874 AC_CACHE_VAL(glibcxx_cv_c99_math_cxx98, [
875 GCC_TRY_COMPILE_OR_LINK(
876 [#include <math.h>
877 volatile double d1, d2;
878 volatile int i;],
879 [i = fpclassify(d1);
880 i = isfinite(d1);
881 i = isinf(d1);
882 i = isnan(d1);
883 i = isnormal(d1);
884 i = signbit(d1);
885 i = isgreater(d1, d2);
886 i = isgreaterequal(d1, d2);
887 i = isless(d1, d2);
888 i = islessequal(d1, d2);
889 i = islessgreater(d1, d2);
890 i = islessgreater(d1, d2);
891 i = isunordered(d1, d2);
892 ], [glibcxx_cv_c99_math_cxx98=yes], [glibcxx_cv_c99_math_cxx98=no])
893 ])
894 AC_MSG_RESULT($glibcxx_cv_c99_math_cxx98)
895 if test x"$glibcxx_cv_c99_math_cxx98" = x"yes"; then
896 AC_DEFINE(_GLIBCXX98_USE_C99_MATH, 1,
897 [Define if C99 functions or macros in <math.h> should be imported
898 in <cmath> in namespace std for C++98.])
899 fi
901 # Check for the existence of <complex.h> complex math functions.
902 # This is necessary even though libstdc++ uses the builtin versions
903 # of these functions, because if the builtin cannot be used, a reference
904 # to the library function is emitted.
905 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
906 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
907 if test x"$ac_has_complex_h" = x"yes"; then
908 AC_MSG_CHECKING([for ISO C99 support in <complex.h> for C++98])
909 AC_CACHE_VAL(glibcxx_cv_c99_complex_cxx98, [
910 GCC_TRY_COMPILE_OR_LINK(
911 [#include <complex.h>
912 typedef __complex__ float float_type;
913 typedef __complex__ double double_type;
914 typedef __complex__ long double ld_type;
915 volatile float_type tmpf;
916 volatile double_type tmpd;
917 volatile ld_type tmpld;
918 volatile float f;
919 volatile double d;
920 volatile long double ld;],
921 [f = cabsf(tmpf);
922 f = cargf(tmpf);
923 tmpf = ccosf(tmpf);
924 tmpf = ccoshf(tmpf);
925 tmpf = cexpf(tmpf);
926 tmpf = clogf(tmpf);
927 tmpf = csinf(tmpf);
928 tmpf = csinhf(tmpf);
929 tmpf = csqrtf(tmpf);
930 tmpf = ctanf(tmpf);
931 tmpf = ctanhf(tmpf);
932 tmpf = cpowf(tmpf, tmpf);
933 tmpf = cprojf(tmpf);
934 d = cabs(tmpd);
935 d = carg(tmpd);
936 tmpd = ccos(tmpd);
937 tmpd = ccosh(tmpd);
938 tmpd = cexp(tmpd);
939 tmpd = clog(tmpd);
940 tmpd = csin(tmpd);
941 tmpd = csinh(tmpd);
942 tmpd = csqrt(tmpd);
943 tmpd = ctan(tmpd);
944 tmpd = ctanh(tmpd);
945 tmpd = cpow(tmpd, tmpd);
946 tmpd = cproj(tmpd);
947 ld = cabsl(tmpld);
948 ld = cargl(tmpld);
949 tmpld = ccosl(tmpld);
950 tmpld = ccoshl(tmpld);
951 tmpld = cexpl(tmpld);
952 tmpld = clogl(tmpld);
953 tmpld = csinl(tmpld);
954 tmpld = csinhl(tmpld);
955 tmpld = csqrtl(tmpld);
956 tmpld = ctanl(tmpld);
957 tmpld = ctanhl(tmpld);
958 tmpld = cpowl(tmpld, tmpld);
959 tmpld = cprojl(tmpld);
960 ], [glibcxx_cv_c99_complex_cxx98=yes], [glibcxx_cv_c99_complex_cxx98=no])
961 ])
962 fi
963 AC_MSG_RESULT($glibcxx_cv_c99_complex_cxx98)
964 if test x"$glibcxx_cv_c99_complex_cxx98" = x"yes"; then
965 AC_DEFINE(_GLIBCXX98_USE_C99_COMPLEX, 1,
966 [Define if C99 functions in <complex.h> should be used in
967 <complex> for C++98. Using compiler builtins for these functions
968 requires corresponding C99 library functions to be present.])
969 fi
971 # Check for the existence in <stdio.h> of vscanf, et. al.
972 AC_MSG_CHECKING([for ISO C99 support in <stdio.h> for C++98])
973 AC_CACHE_VAL(glibcxx_cv_c99_stdio_cxx98, [
974 GCC_TRY_COMPILE_OR_LINK(
975 [#include <stdio.h>
976 #include <stdarg.h>
977 void foo(char* fmt, ...)
978 {
979 va_list args; va_start(args, fmt);
980 vfscanf(stderr, "%i", args);
981 vscanf("%i", args);
982 vsnprintf(fmt, 0, "%i", args);
983 vsscanf(fmt, "%i", args);
984 snprintf(fmt, 0, "%i");
985 }], [],
986 [glibcxx_cv_c99_stdio_cxx98=yes], [glibcxx_cv_c99_stdio_cxx98=no])
987 ])
988 AC_MSG_RESULT($glibcxx_cv_c99_stdio_cxx98)
989 if test x"$glibcxx_cv_c99_stdio_cxx98" = x"yes"; then
990 AC_DEFINE(_GLIBCXX98_USE_C99_STDIO, 1,
991 [Define if C99 functions or macros in <stdio.h> should be imported
992 in <cstdio> in namespace std for C++98.])
993 fi
995 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
996 AC_MSG_CHECKING([for ISO C99 support in <stdlib.h> for C++98])
997 AC_CACHE_VAL(glibcxx_cv_c99_stdlib_cxx98, [
998 GCC_TRY_COMPILE_OR_LINK(
999 [#include <stdlib.h>
1000 volatile float f;
1001 volatile long double ld;
1002 volatile unsigned long long ll;
1003 lldiv_t mydivt;],
1004 [char* tmp;
1005 f = strtof("gnu", &tmp);
1006 ld = strtold("gnu", &tmp);
1007 ll = strtoll("gnu", &tmp, 10);
1008 ll = strtoull("gnu", &tmp, 10);
1009 ll = llabs(10);
1010 mydivt = lldiv(10,1);
1011 ll = mydivt.quot;
1012 ll = mydivt.rem;
1013 ll = atoll("10");
1014 _Exit(0);
1015 ], [glibcxx_cv_c99_stdlib_cxx98=yes], [glibcxx_cv_c99_stdlib_cxx98=no])
1016 ])
1017 AC_MSG_RESULT($glibcxx_cv_c99_stdlib_cxx98)
1018 if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
1019 AC_DEFINE(_GLIBCXX98_USE_C99_STDLIB, 1,
1020 [Define if C99 functions or macros in <stdlib.h> should be imported
1021 in <cstdlib> in namespace std for C++98.])
1022 fi
1024 # Check for the existence in <wchar.h> of wcstold, etc.
1025 if test x"$ac_has_wchar_h" = xyes &&
1026 test x"$ac_has_wctype_h" = xyes; then
1027 AC_MSG_CHECKING([for ISO C99 support in <wchar.h> for C++98])
1028 AC_CACHE_VAL(glibcxx_cv_c99_wchar_cxx98, [
1029 AC_TRY_COMPILE([#include <wchar.h>
1030 namespace test
1031 {
1032 using ::wcstold;
1033 using ::wcstoll;
1034 using ::wcstoull;
1035 }
1036 ], [], [glibcxx_cv_c99_wchar_cxx98=yes], [glibcxx_cv_c99_wchar_cxx98=no])
1037 ])
1039 # Checks for wide character functions that may not be present.
1040 # Injection of these is wrapped with guard macros.
1041 # NB: only put functions here, instead of immediately above, if
1042 # absolutely necessary.
1043 AC_TRY_COMPILE([#include <wchar.h>
1044 namespace test { using ::vfwscanf; }], [],
1045 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1047 AC_TRY_COMPILE([#include <wchar.h>
1048 namespace test { using ::vswscanf; }], [],
1049 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1051 AC_TRY_COMPILE([#include <wchar.h>
1052 namespace test { using ::vwscanf; }], [],
1053 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1055 AC_TRY_COMPILE([#include <wchar.h>
1056 namespace test { using ::wcstof; }], [],
1057 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1059 AC_TRY_COMPILE([#include <wctype.h>],
1060 [wint_t t; int i = iswblank(t);],
1061 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1063 AC_MSG_RESULT($glibcxx_cv_c99_wchar_cxx98)
1064 if test x"$glibcxx_cv_c99_wchar_cxx98" = x"yes"; then
1065 AC_DEFINE(_GLIBCXX98_USE_C99_WCHAR, 1,
1066 [Define if C99 functions or macros in <wchar.h> should be imported
1067 in <cwchar> in namespace std for C++98.])
1068 fi
1069 fi
1071 # Option parsed, now set things appropriately.
1072 if test x"$glibcxx_cv_c99_math_cxx98" = x"no" ||
1073 test x"$glibcxx_cv_c99_complex_cxx98" = x"no" ||
1074 test x"$glibcxx_cv_c99_stdio_cxx98" = x"no" ||
1075 test x"$glibcxx_cv_c99_stdlib_cxx98" = x"no" ||
1076 test x"$glibcxx_cv_c99_wchar_cxx98" = x"no"; then
1077 enable_c99=no;
1078 else
1079 AC_DEFINE(_GLIBCXX_USE_C99, 1,
1080 [Define if C99 functions or macros from <wchar.h>, <math.h>,
1081 <complex.h>, <stdio.h>, and <stdlib.h> can be used or exposed.])
1082 fi
1084 gcc_no_link="$ac_save_gcc_no_link"
1085 LIBS="$ac_save_LIBS"
1086 CXXFLAGS="$ac_save_CXXFLAGS"
1087 AC_LANG_RESTORE
1089 AC_LANG_SAVE
1090 AC_LANG_CPLUSPLUS
1092 # Use -std=c++11 and test again for C99 library feature in C++11 mode.
1093 # For the reasons given above we use -std=c++11 not -std=gnu++11.
1094 ac_save_CXXFLAGS="$CXXFLAGS"
1095 CXXFLAGS="$CXXFLAGS -std=c++11"
1096 ac_save_LIBS="$LIBS"
1097 ac_save_gcc_no_link="$gcc_no_link"
1099 if test x$gcc_no_link != xyes; then
1100 # Use -fno-exceptions to that the C driver can link these tests without
1101 # hitting undefined references to personality routines.
1102 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1103 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
1104 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
1105 gcc_no_link=yes
1106 ])
1107 fi
1109 # Check for the existence of <math.h> functions used if C99 is enabled.
1110 AC_MSG_CHECKING([for ISO C99 support in <math.h> for C++11])
1111 AC_CACHE_VAL(glibcxx_cv_c99_math_cxx11, [
1112 GCC_TRY_COMPILE_OR_LINK(
1113 [#include <math.h>
1114 volatile double d1, d2;
1115 volatile int i;],
1116 [i = fpclassify(d1);
1117 i = isfinite(d1);
1118 i = isinf(d1);
1119 i = isnan(d1);
1120 i = isnormal(d1);
1121 i = signbit(d1);
1122 i = isgreater(d1, d2);
1123 i = isgreaterequal(d1, d2);
1124 i = isless(d1, d2);
1125 i = islessequal(d1, d2);
1126 i = islessgreater(d1, d2);
1127 i = islessgreater(d1, d2);
1128 i = isunordered(d1, d2);
1129 ], [glibcxx_cv_c99_math_cxx11=yes], [glibcxx_cv_c99_math_cxx11=no])
1130 ])
1131 AC_MSG_RESULT($glibcxx_cv_c99_math_cxx11)
1132 if test x"$glibcxx_cv_c99_math_cxx11" = x"yes"; then
1133 AC_DEFINE(_GLIBCXX11_USE_C99_MATH, 1,
1134 [Define if C99 functions or macros in <math.h> should be imported
1135 in <cmath> in namespace std for C++11.])
1136 fi
1138 # Check for the existence of <complex.h> complex math functions.
1139 # This is necessary even though libstdc++ uses the builtin versions
1140 # of these functions, because if the builtin cannot be used, a reference
1141 # to the library function is emitted.
1142 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
1143 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1144 if test x"$ac_has_complex_h" = x"yes"; then
1145 AC_MSG_CHECKING([for ISO C99 support in <complex.h> for C++11])
1146 AC_CACHE_VAL(glibcxx_cv_c99_complex_cxx11, [
1147 GCC_TRY_COMPILE_OR_LINK(
1148 [#include <complex.h>
1149 typedef __complex__ float float_type;
1150 typedef __complex__ double double_type;
1151 typedef __complex__ long double ld_type;
1152 volatile float_type tmpf;
1153 volatile double_type tmpd;
1154 volatile ld_type tmpld;
1155 volatile float f;
1156 volatile double d;
1157 volatile long double ld;],
1158 [f = cabsf(tmpf);
1159 f = cargf(tmpf);
1160 tmpf = ccosf(tmpf);
1161 tmpf = ccoshf(tmpf);
1162 tmpf = cexpf(tmpf);
1163 tmpf = clogf(tmpf);
1164 tmpf = csinf(tmpf);
1165 tmpf = csinhf(tmpf);
1166 tmpf = csqrtf(tmpf);
1167 tmpf = ctanf(tmpf);
1168 tmpf = ctanhf(tmpf);
1169 tmpf = cpowf(tmpf, tmpf);
1170 tmpf = cprojf(tmpf);
1171 d = cabs(tmpd);
1172 d = carg(tmpd);
1173 tmpd = ccos(tmpd);
1174 tmpd = ccosh(tmpd);
1175 tmpd = cexp(tmpd);
1176 tmpd = clog(tmpd);
1177 tmpd = csin(tmpd);
1178 tmpd = csinh(tmpd);
1179 tmpd = csqrt(tmpd);
1180 tmpd = ctan(tmpd);
1181 tmpd = ctanh(tmpd);
1182 tmpd = cpow(tmpd, tmpd);
1183 tmpd = cproj(tmpd);
1184 ld = cabsl(tmpld);
1185 ld = cargl(tmpld);
1186 tmpld = ccosl(tmpld);
1187 tmpld = ccoshl(tmpld);
1188 tmpld = cexpl(tmpld);
1189 tmpld = clogl(tmpld);
1190 tmpld = csinl(tmpld);
1191 tmpld = csinhl(tmpld);
1192 tmpld = csqrtl(tmpld);
1193 tmpld = ctanl(tmpld);
1194 tmpld = ctanhl(tmpld);
1195 tmpld = cpowl(tmpld, tmpld);
1196 tmpld = cprojl(tmpld);
1197 ], [glibcxx_cv_c99_complex_cxx11=yes], [glibcxx_cv_c99_complex_cxx11=no])
1198 ])
1199 fi
1200 AC_MSG_RESULT($glibcxx_cv_c99_complex_cxx11)
1201 if test x"$glibcxx_cv_c99_complex_cxx11" = x"yes"; then
1202 AC_DEFINE(_GLIBCXX11_USE_C99_COMPLEX, 1,
1203 [Define if C99 functions in <complex.h> should be used in
1204 <complex> for C++11. Using compiler builtins for these functions
1205 requires corresponding C99 library functions to be present.])
1206 fi
1208 # Check for the existence in <stdio.h> of vscanf, et. al.
1209 AC_MSG_CHECKING([for ISO C99 support in <stdio.h> for C++11])
1210 AC_CACHE_VAL(glibcxx_cv_c99_stdio_cxx11, [
1211 GCC_TRY_COMPILE_OR_LINK(
1212 [#include <stdio.h>
1213 #include <stdarg.h>
1214 void foo(char* fmt, ...)
1215 {
1216 va_list args; va_start(args, fmt);
1217 vfscanf(stderr, "%i", args);
1218 vscanf("%i", args);
1219 vsnprintf(fmt, 0, "%i", args);
1220 vsscanf(fmt, "%i", args);
1221 snprintf(fmt, 0, "%i");
1222 }], [],
1223 [glibcxx_cv_c99_stdio_cxx11=yes], [glibcxx_cv_c99_stdio_cxx11=no])
1224 ])
1225 AC_MSG_RESULT($glibcxx_cv_c99_stdio_cxx11)
1226 if test x"$glibcxx_cv_c99_stdio_cxx11" = x"yes"; then
1227 AC_DEFINE(_GLIBCXX11_USE_C99_STDIO, 1,
1228 [Define if C99 functions or macros in <stdio.h> should be imported
1229 in <cstdio> in namespace std for C++11.])
1230 fi
1232 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
1233 AC_MSG_CHECKING([for ISO C99 support in <stdlib.h> for C++11])
1234 AC_CACHE_VAL(glibcxx_cv_c99_stdlib_cxx11, [
1235 GCC_TRY_COMPILE_OR_LINK(
1236 [#include <stdlib.h>
1237 volatile float f;
1238 volatile long double ld;
1239 volatile unsigned long long ll;
1240 lldiv_t mydivt;],
1241 [char* tmp;
1242 f = strtof("gnu", &tmp);
1243 ld = strtold("gnu", &tmp);
1244 ll = strtoll("gnu", &tmp, 10);
1245 ll = strtoull("gnu", &tmp, 10);
1246 ll = llabs(10);
1247 mydivt = lldiv(10,1);
1248 ll = mydivt.quot;
1249 ll = mydivt.rem;
1250 ll = atoll("10");
1251 _Exit(0);
1252 ], [glibcxx_cv_c99_stdlib_cxx11=yes], [glibcxx_cv_c99_stdlib_cxx11=no])
1253 ])
1254 AC_MSG_RESULT($glibcxx_cv_c99_stdlib_cxx11)
1255 if test x"$glibcxx_cv_c99_stdlib_cxx11" = x"yes"; then
1256 AC_DEFINE(_GLIBCXX11_USE_C99_STDLIB, 1,
1257 [Define if C99 functions or macros in <stdlib.h> should be imported
1258 in <cstdlib> in namespace std for C++11.])
1259 fi
1261 # Check for the existence in <wchar.h> of wcstold, etc.
1262 if test x"$ac_has_wchar_h" = xyes &&
1263 test x"$ac_has_wctype_h" = xyes; then
1264 AC_MSG_CHECKING([for ISO C99 support in <wchar.h> for C++11])
1265 AC_CACHE_VAL(glibcxx_cv_c99_wchar_cxx11, [
1266 AC_TRY_COMPILE([#include <wchar.h>
1267 namespace test
1268 {
1269 using ::wcstold;
1270 using ::wcstoll;
1271 using ::wcstoull;
1272 }
1273 ], [], [glibcxx_cv_c99_wchar_cxx11=yes], [glibcxx_cv_c99_wchar_cxx11=no])
1274 ])
1276 # Checks for wide character functions that may not be present.
1277 # Injection of these is wrapped with guard macros.
1278 # NB: only put functions here, instead of immediately above, if
1279 # absolutely necessary.
1280 AC_TRY_COMPILE([#include <wchar.h>
1281 namespace test { using ::vfwscanf; }], [],
1282 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1284 AC_TRY_COMPILE([#include <wchar.h>
1285 namespace test { using ::vswscanf; }], [],
1286 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1288 AC_TRY_COMPILE([#include <wchar.h>
1289 namespace test { using ::vwscanf; }], [],
1290 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1292 AC_TRY_COMPILE([#include <wchar.h>
1293 namespace test { using ::wcstof; }], [],
1294 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1296 AC_TRY_COMPILE([#include <wctype.h>],
1297 [wint_t t; int i = iswblank(t);],
1298 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1300 AC_MSG_RESULT($glibcxx_cv_c99_wchar_cxx11)
1301 if test x"$glibcxx_cv_c99_wchar_cxx11" = x"yes"; then
1302 AC_DEFINE(_GLIBCXX11_USE_C99_WCHAR, 1,
1303 [Define if C99 functions or macros in <wchar.h> should be imported
1304 in <cwchar> in namespace std for C++11.])
1305 fi
1306 fi
1308 gcc_no_link="$ac_save_gcc_no_link"
1309 LIBS="$ac_save_LIBS"
1310 CXXFLAGS="$ac_save_CXXFLAGS"
1311 AC_LANG_RESTORE
1312 fi
1314 AC_MSG_CHECKING([for fully enabled ISO C99 support])
1315 AC_MSG_RESULT($enable_c99)
1316 ])
1319 dnl
1320 dnl Check for clock_gettime, nanosleep and sched_yield, used in the
1321 dnl implementation of 20.11.7 [time.clock], and 30.3.2 [thread.thread.this]
1322 dnl in the C++11 standard.
1323 dnl
1324 dnl --enable-libstdcxx-time
1325 dnl --enable-libstdcxx-time=yes
1326 dnl checks for the availability of monotonic and realtime clocks,
1327 dnl nanosleep and sched_yield in libc.
1328 dnl --enable-libstdcxx-time=rt
1329 dnl also searches (and, if needed, links) librt. Note that this is
1330 dnl not always desirable because, in glibc 2.16 and earlier, for
1331 dnl example, in turn it triggers the linking of libpthread too,
1332 dnl which activates locking,
1333 dnl a large overhead for single-thread programs.
1334 dnl --enable-libstdcxx-time=no
1335 dnl --disable-libstdcxx-time
1336 dnl disables the checks completely
1337 dnl
1338 dnl N.B. Darwin provides nanosleep but doesn't support the whole POSIX
1339 dnl Timers option, so doesn't define _POSIX_TIMERS. Because the test
1340 dnl below fails Darwin unconditionally defines _GLIBCXX_USE_NANOSLEEP in
1341 dnl os_defines.h and also defines _GLIBCXX_USE_SCHED_YIELD.
1342 dnl
1343 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
1345 GLIBCXX_ENABLE(libstdcxx-time,auto,[[[=KIND]]],
1346 [use KIND for check type],
1347 [permit yes|no|rt])
1349 AC_LANG_SAVE
1350 AC_LANG_CPLUSPLUS
1351 ac_save_CXXFLAGS="$CXXFLAGS"
1352 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1353 ac_save_LIBS="$LIBS"
1355 ac_has_clock_monotonic=no
1356 ac_has_clock_realtime=no
1357 ac_has_nanosleep=no
1358 ac_has_sched_yield=no
1360 if test x"$enable_libstdcxx_time" = x"auto"; then
1362 case "${target_os}" in
1363 cygwin*)
1364 ac_has_nanosleep=yes
1365 ;;
1366 darwin*)
1367 ac_has_nanosleep=yes
1368 ac_has_sched_yield=yes
1369 ;;
1370 # VxWorks has nanosleep as soon as the kernel is configured with
1371 # INCLUDE_POSIX_TIMERS, which is normally/most-often the case.
1372 vxworks*)
1373 ac_has_nanosleep=yes
1374 ;;
1375 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
1376 # Don't use link test for freestanding library, in case gcc_no_link=yes
1377 if test x"$is_hosted" = xyes; then
1378 # Versions of glibc before 2.17 needed -lrt for clock_gettime.
1379 AC_SEARCH_LIBS(clock_gettime, [rt])
1380 if test x"$ac_cv_search_clock_gettime" = x"none required"; then
1381 ac_has_clock_monotonic=yes
1382 ac_has_clock_realtime=yes
1383 fi
1384 fi
1385 ac_has_nanosleep=yes
1386 ac_has_sched_yield=yes
1387 ;;
1388 freebsd*|netbsd*|dragonfly*|rtems*)
1389 ac_has_clock_monotonic=yes
1390 ac_has_clock_realtime=yes
1391 ac_has_nanosleep=yes
1392 ac_has_sched_yield=yes
1393 ;;
1394 openbsd*)
1395 ac_has_clock_monotonic=yes
1396 ac_has_clock_realtime=yes
1397 ac_has_nanosleep=yes
1398 ;;
1399 solaris*)
1400 ac_has_clock_monotonic=yes
1401 ac_has_clock_realtime=yes
1402 ac_has_nanosleep=yes
1403 ac_has_sched_yield=yes
1404 ;;
1405 uclinux*)
1406 ac_has_nanosleep=yes
1407 ac_has_sched_yield=yes
1408 esac
1410 elif test x"$enable_libstdcxx_time" != x"no"; then
1412 if test x"$enable_libstdcxx_time" = x"rt"; then
1413 AC_SEARCH_LIBS(clock_gettime, [rt])
1414 AC_SEARCH_LIBS(nanosleep, [rt])
1415 else
1416 AC_CHECK_FUNC(clock_gettime)
1417 AC_CHECK_FUNC(nanosleep)
1418 fi
1420 case "$ac_cv_search_clock_gettime" in
1421 -l*) GLIBCXX_LIBS=$ac_cv_search_clock_gettime
1422 ;;
1423 esac
1424 case "$ac_cv_search_nanosleep" in
1425 -l*) GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_nanosleep"
1426 ;;
1427 esac
1429 AC_SEARCH_LIBS(sched_yield, [rt])
1431 case "$ac_cv_search_sched_yield" in
1432 -lrt*)
1433 if test x"$enable_libstdcxx_time" = x"rt"; then
1434 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1435 ac_has_sched_yield=yes
1436 fi
1437 ;;
1438 *)
1439 ac_has_sched_yield=yes
1440 ;;
1441 esac
1443 AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
1445 if test x"$ac_has_unistd_h" = x"yes"; then
1446 AC_MSG_CHECKING([for monotonic clock])
1447 AC_TRY_LINK(
1448 [#include <unistd.h>
1449 #include <time.h>
1450 ],
1451 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1452 timespec tp;
1453 #endif
1454 clock_gettime(CLOCK_MONOTONIC, &tp);
1455 ], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
1457 AC_MSG_RESULT($ac_has_clock_monotonic)
1459 AC_MSG_CHECKING([for realtime clock])
1460 AC_TRY_LINK(
1461 [#include <unistd.h>
1462 #include <time.h>
1463 ],
1464 [#if _POSIX_TIMERS > 0
1465 timespec tp;
1466 #endif
1467 clock_gettime(CLOCK_REALTIME, &tp);
1468 ], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
1470 AC_MSG_RESULT($ac_has_clock_realtime)
1472 AC_MSG_CHECKING([for nanosleep])
1473 AC_TRY_LINK(
1474 [#include <unistd.h>
1475 #include <time.h>
1476 ],
1477 [#if _POSIX_TIMERS > 0
1478 timespec tp;
1479 #endif
1480 nanosleep(&tp, 0);
1481 ], [ac_has_nanosleep=yes], [ac_has_nanosleep=no])
1483 AC_MSG_RESULT($ac_has_nanosleep)
1484 fi
1485 fi
1487 if test x"$ac_has_clock_monotonic" != x"yes"; then
1488 case ${target_os} in
1489 linux* | uclinux*)
1490 AC_MSG_CHECKING([for clock_gettime syscall])
1491 AC_TRY_COMPILE(
1492 [#include <unistd.h>
1493 #include <time.h>
1494 #include <sys/syscall.h>
1495 ],
1496 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1497 timespec tp;
1498 #endif
1499 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp);
1500 syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);
1501 ], [ac_has_clock_gettime_syscall=yes], [ac_has_clock_gettime_syscall=no])
1502 AC_MSG_RESULT($ac_has_clock_gettime_syscall)
1503 if test x"$ac_has_clock_gettime_syscall" = x"yes"; then
1504 AC_DEFINE(_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL, 1,
1505 [Defined if clock_gettime syscall has monotonic and realtime clock support. ])
1506 ac_has_clock_monotonic=yes
1507 ac_has_clock_realtime=yes
1508 AC_MSG_CHECKING([for struct timespec that matches syscall])
1509 AC_TRY_COMPILE(
1510 [#include <time.h>
1511 #include <sys/syscall.h>
1512 ],
1513 [#ifdef SYS_clock_gettime64
1514 #if SYS_clock_gettime64 != SYS_clock_gettime
1515 // We need to use SYS_clock_gettime and libc appears to
1516 // also know about the SYS_clock_gettime64 syscall.
1517 // Check that userspace doesn't use time64 version of timespec.
1518 static_assert(sizeof(timespec::tv_sec) == sizeof(long),
1519 "struct timespec must be compatible with SYS_clock_gettime");
1520 #endif
1521 #endif
1522 ],
1523 [ac_timespec_matches_syscall=yes],
1524 [ac_timespec_matches_syscall=no])
1525 AC_MSG_RESULT($ac_timespec_matches_syscall)
1526 if test x"$ac_timespec_matches_syscall" = no; then
1527 AC_MSG_ERROR([struct timespec is not compatible with SYS_clock_gettime, please report a bug to http://gcc.gnu.org/bugzilla])
1528 fi
1529 fi;;
1530 esac
1531 fi
1533 if test x"$ac_has_clock_monotonic" = x"yes"; then
1534 AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
1535 [ Defined if clock_gettime has monotonic clock support. ])
1536 fi
1538 if test x"$ac_has_clock_realtime" = x"yes"; then
1539 AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
1540 [ Defined if clock_gettime has realtime clock support. ])
1541 fi
1543 if test x"$ac_has_sched_yield" = x"yes"; then
1544 AC_DEFINE(_GLIBCXX_USE_SCHED_YIELD, 1,
1545 [ Defined if sched_yield is available. ])
1546 fi
1548 if test x"$ac_has_nanosleep" = x"yes"; then
1549 AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
1550 [ Defined if nanosleep is available. ])
1551 else
1552 AC_MSG_CHECKING([for sleep])
1553 AC_TRY_COMPILE([#include <unistd.h>],
1554 [sleep(1)],
1555 [ac_has_sleep=yes],[ac_has_sleep=no])
1556 if test x"$ac_has_sleep" = x"yes"; then
1557 AC_DEFINE(HAVE_SLEEP,1, [Defined if sleep exists.])
1558 fi
1559 AC_MSG_RESULT($ac_has_sleep)
1560 AC_MSG_CHECKING([for usleep])
1561 AC_TRY_COMPILE([#include <unistd.h>],
1562 [sleep(1);
1563 usleep(100);],
1564 [ac_has_usleep=yes],[ac_has_usleep=no])
1565 if test x"$ac_has_usleep" = x"yes"; then
1566 AC_DEFINE(HAVE_USLEEP,1, [Defined if usleep exists.])
1567 fi
1568 AC_MSG_RESULT($ac_has_usleep)
1569 fi
1571 if test x"$ac_has_nanosleep$ac_has_sleep" = x"nono"; then
1572 ac_no_sleep=yes
1573 AC_MSG_CHECKING([for Sleep])
1574 AC_TRY_COMPILE([#include <windows.h>],
1575 [Sleep(1)],
1576 [ac_has_win32_sleep=yes],[ac_has_win32_sleep=no])
1577 if test x"$ac_has_win32_sleep" = x"yes"; then
1578 AC_DEFINE(HAVE_WIN32_SLEEP,1, [Defined if Sleep exists.])
1579 ac_no_sleep=no
1580 fi
1581 AC_MSG_RESULT($ac_has_win32_sleep)
1582 fi
1584 if test x"$ac_no_sleep" = x"yes"; then
1585 AC_DEFINE(NO_SLEEP,1, [Defined if no way to sleep is available.])
1586 fi
1588 AC_SUBST(GLIBCXX_LIBS)
1590 CXXFLAGS="$ac_save_CXXFLAGS"
1591 LIBS="$ac_save_LIBS"
1592 AC_LANG_RESTORE
1593 ])
1595 dnl
1596 dnl Check for gettimeofday, used in the implementation of 20.11.7
1597 dnl [time.clock] in the C++11 standard.
1598 dnl
1599 AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
1601 AC_MSG_CHECKING([for gettimeofday])
1603 AC_LANG_SAVE
1604 AC_LANG_CPLUSPLUS
1605 ac_save_CXXFLAGS="$CXXFLAGS"
1606 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1608 ac_has_gettimeofday=no;
1609 AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
1610 if test x"$ac_has_sys_time_h" = x"yes"; then
1611 AC_MSG_CHECKING([for gettimeofday])
1612 GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
1613 [timeval tv; gettimeofday(&tv, 0);],
1614 [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
1616 AC_MSG_RESULT($ac_has_gettimeofday)
1617 fi
1619 if test x"$ac_has_gettimeofday" = x"yes"; then
1620 AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
1621 [ Defined if gettimeofday is available. ])
1622 fi
1624 CXXFLAGS="$ac_save_CXXFLAGS"
1625 AC_LANG_RESTORE
1626 ])
1628 dnl
1629 dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
1630 dnl facilities in Chapter 8, "C compatibility".
1631 dnl
1632 AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
1634 AC_LANG_SAVE
1635 AC_LANG_CPLUSPLUS
1637 # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
1638 # undefined and fake C99 facilities may be spuriously enabled.
1639 ac_save_CXXFLAGS="$CXXFLAGS"
1640 CXXFLAGS="$CXXFLAGS -std=c++98"
1642 # Check for the existence of <complex.h> complex math functions used
1643 # by tr1/complex.
1644 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1645 ac_c99_complex_tr1=no;
1646 if test x"$ac_has_complex_h" = x"yes"; then
1647 AC_MSG_CHECKING([for ISO C99 support to TR1 in <complex.h>])
1648 AC_TRY_COMPILE([#include <complex.h>],
1649 [typedef __complex__ float float_type; float_type tmpf;
1650 cacosf(tmpf);
1651 casinf(tmpf);
1652 catanf(tmpf);
1653 cacoshf(tmpf);
1654 casinhf(tmpf);
1655 catanhf(tmpf);
1656 typedef __complex__ double double_type; double_type tmpd;
1657 cacos(tmpd);
1658 casin(tmpd);
1659 catan(tmpd);
1660 cacosh(tmpd);
1661 casinh(tmpd);
1662 catanh(tmpd);
1663 typedef __complex__ long double ld_type; ld_type tmpld;
1664 cacosl(tmpld);
1665 casinl(tmpld);
1666 catanl(tmpld);
1667 cacoshl(tmpld);
1668 casinhl(tmpld);
1669 catanhl(tmpld);
1670 ],[ac_c99_complex_tr1=yes], [ac_c99_complex_tr1=no])
1671 fi
1672 AC_MSG_RESULT($ac_c99_complex_tr1)
1673 if test x"$ac_c99_complex_tr1" = x"yes"; then
1674 AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_TR1, 1,
1675 [Define if C99 functions in <complex.h> should be used in
1676 <tr1/complex>. Using compiler builtins for these functions
1677 requires corresponding C99 library functions to be present.])
1678 fi
1680 # Check for the existence of <ctype.h> functions.
1681 AC_MSG_CHECKING([for ISO C99 support to TR1 in <ctype.h>])
1682 AC_CACHE_VAL(glibcxx_cv_c99_ctype_tr1, [
1683 AC_TRY_COMPILE([#include <ctype.h>],
1684 [int ch;
1685 int ret;
1686 ret = isblank(ch);
1687 ],[glibcxx_cv_c99_ctype_tr1=yes],
1688 [glibcxx_cv_c99_ctype_tr1=no])
1689 ])
1690 AC_MSG_RESULT($glibcxx_cv_c99_ctype_tr1)
1691 if test x"$glibcxx_cv_c99_ctype_tr1" = x"yes"; then
1692 AC_DEFINE(_GLIBCXX_USE_C99_CTYPE_TR1, 1,
1693 [Define if C99 functions in <ctype.h> should be imported in
1694 <tr1/cctype> in namespace std::tr1.])
1695 fi
1697 # Check for the existence of <fenv.h> functions.
1698 AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no)
1699 ac_c99_fenv_tr1=no;
1700 if test x"$ac_has_fenv_h" = x"yes"; then
1701 AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>])
1702 AC_TRY_COMPILE([#include <fenv.h>],
1703 [int except, mode;
1704 fexcept_t* pflag;
1705 fenv_t* penv;
1706 int ret;
1707 ret = feclearexcept(except);
1708 ret = fegetexceptflag(pflag, except);
1709 ret = feraiseexcept(except);
1710 ret = fesetexceptflag(pflag, except);
1711 ret = fetestexcept(except);
1712 ret = fegetround();
1713 ret = fesetround(mode);
1714 ret = fegetenv(penv);
1715 ret = feholdexcept(penv);
1716 ret = fesetenv(penv);
1717 ret = feupdateenv(penv);
1718 ],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no])
1719 fi
1720 AC_MSG_RESULT($ac_c99_fenv_tr1)
1721 if test x"$ac_c99_fenv_tr1" = x"yes"; then
1722 AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1,
1723 [Define if C99 functions in <fenv.h> should be imported in
1724 <tr1/cfenv> in namespace std::tr1.])
1725 fi
1727 # Check for the existence of <stdint.h> types.
1728 AC_MSG_CHECKING([for ISO C99 support to TR1 in <stdint.h>])
1729 AC_CACHE_VAL(glibcxx_cv_c99_stdint_tr1, [
1730 AC_TRY_COMPILE([#define __STDC_LIMIT_MACROS
1731 #define __STDC_CONSTANT_MACROS
1732 #include <stdint.h>],
1733 [typedef int8_t my_int8_t;
1734 my_int8_t i8 = INT8_MIN;
1735 i8 = INT8_MAX;
1736 typedef int16_t my_int16_t;
1737 my_int16_t i16 = INT16_MIN;
1738 i16 = INT16_MAX;
1739 typedef int32_t my_int32_t;
1740 my_int32_t i32 = INT32_MIN;
1741 i32 = INT32_MAX;
1742 typedef int64_t my_int64_t;
1743 my_int64_t i64 = INT64_MIN;
1744 i64 = INT64_MAX;
1745 typedef int_fast8_t my_int_fast8_t;
1746 my_int_fast8_t if8 = INT_FAST8_MIN;
1747 if8 = INT_FAST8_MAX;
1748 typedef int_fast16_t my_int_fast16_t;
1749 my_int_fast16_t if16 = INT_FAST16_MIN;
1750 if16 = INT_FAST16_MAX;
1751 typedef int_fast32_t my_int_fast32_t;
1752 my_int_fast32_t if32 = INT_FAST32_MIN;
1753 if32 = INT_FAST32_MAX;
1754 typedef int_fast64_t my_int_fast64_t;
1755 my_int_fast64_t if64 = INT_FAST64_MIN;
1756 if64 = INT_FAST64_MAX;
1757 typedef int_least8_t my_int_least8_t;
1758 my_int_least8_t il8 = INT_LEAST8_MIN;
1759 il8 = INT_LEAST8_MAX;
1760 typedef int_least16_t my_int_least16_t;
1761 my_int_least16_t il16 = INT_LEAST16_MIN;
1762 il16 = INT_LEAST16_MAX;
1763 typedef int_least32_t my_int_least32_t;
1764 my_int_least32_t il32 = INT_LEAST32_MIN;
1765 il32 = INT_LEAST32_MAX;
1766 typedef int_least64_t my_int_least64_t;
1767 my_int_least64_t il64 = INT_LEAST64_MIN;
1768 il64 = INT_LEAST64_MAX;
1769 typedef intmax_t my_intmax_t;
1770 my_intmax_t im = INTMAX_MAX;
1771 im = INTMAX_MIN;
1772 typedef intptr_t my_intptr_t;
1773 my_intptr_t ip = INTPTR_MAX;
1774 ip = INTPTR_MIN;
1775 typedef uint8_t my_uint8_t;
1776 my_uint8_t ui8 = UINT8_MAX;
1777 ui8 = UINT8_MAX;
1778 typedef uint16_t my_uint16_t;
1779 my_uint16_t ui16 = UINT16_MAX;
1780 ui16 = UINT16_MAX;
1781 typedef uint32_t my_uint32_t;
1782 my_uint32_t ui32 = UINT32_MAX;
1783 ui32 = UINT32_MAX;
1784 typedef uint64_t my_uint64_t;
1785 my_uint64_t ui64 = UINT64_MAX;
1786 ui64 = UINT64_MAX;
1787 typedef uint_fast8_t my_uint_fast8_t;
1788 my_uint_fast8_t uif8 = UINT_FAST8_MAX;
1789 uif8 = UINT_FAST8_MAX;
1790 typedef uint_fast16_t my_uint_fast16_t;
1791 my_uint_fast16_t uif16 = UINT_FAST16_MAX;
1792 uif16 = UINT_FAST16_MAX;
1793 typedef uint_fast32_t my_uint_fast32_t;
1794 my_uint_fast32_t uif32 = UINT_FAST32_MAX;
1795 uif32 = UINT_FAST32_MAX;
1796 typedef uint_fast64_t my_uint_fast64_t;
1797 my_uint_fast64_t uif64 = UINT_FAST64_MAX;
1798 uif64 = UINT_FAST64_MAX;
1799 typedef uint_least8_t my_uint_least8_t;
1800 my_uint_least8_t uil8 = UINT_LEAST8_MAX;
1801 uil8 = UINT_LEAST8_MAX;
1802 typedef uint_least16_t my_uint_least16_t;
1803 my_uint_least16_t uil16 = UINT_LEAST16_MAX;
1804 uil16 = UINT_LEAST16_MAX;
1805 typedef uint_least32_t my_uint_least32_t;
1806 my_uint_least32_t uil32 = UINT_LEAST32_MAX;
1807 uil32 = UINT_LEAST32_MAX;
1808 typedef uint_least64_t my_uint_least64_t;
1809 my_uint_least64_t uil64 = UINT_LEAST64_MAX;
1810 uil64 = UINT_LEAST64_MAX;
1811 typedef uintmax_t my_uintmax_t;
1812 my_uintmax_t uim = UINTMAX_MAX;
1813 uim = UINTMAX_MAX;
1814 typedef uintptr_t my_uintptr_t;
1815 my_uintptr_t uip = UINTPTR_MAX;
1816 uip = UINTPTR_MAX;
1817 ],[glibcxx_cv_c99_stdint_tr1=yes],
1818 [glibcxx_cv_c99_stdint_tr1=no])
1819 ])
1820 AC_MSG_RESULT($glibcxx_cv_c99_stdint_tr1)
1821 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1822 AC_DEFINE(_GLIBCXX_USE_C99_STDINT_TR1, 1,
1823 [Define if C99 types in <stdint.h> should be imported in
1824 <tr1/cstdint> in namespace std::tr1.])
1825 fi
1827 # Check for the existence of <math.h> functions.
1828 AC_MSG_CHECKING([for ISO C99 support to TR1 in <math.h>])
1829 AC_CACHE_VAL(glibcxx_cv_c99_math_tr1, [
1830 AC_TRY_COMPILE([#include <math.h>],
1831 [typedef double_t my_double_t;
1832 typedef float_t my_float_t;
1833 acosh(0.0);
1834 acoshf(0.0f);
1835 acoshl(0.0l);
1836 asinh(0.0);
1837 asinhf(0.0f);
1838 asinhl(0.0l);
1839 atanh(0.0);
1840 atanhf(0.0f);
1841 atanhl(0.0l);
1842 cbrt(0.0);
1843 cbrtf(0.0f);
1844 cbrtl(0.0l);
1845 copysign(0.0, 0.0);
1846 copysignf(0.0f, 0.0f);
1847 copysignl(0.0l, 0.0l);
1848 erf(0.0);
1849 erff(0.0f);
1850 erfl(0.0l);
1851 erfc(0.0);
1852 erfcf(0.0f);
1853 erfcl(0.0l);
1854 exp2(0.0);
1855 exp2f(0.0f);
1856 exp2l(0.0l);
1857 expm1(0.0);
1858 expm1f(0.0f);
1859 expm1l(0.0l);
1860 fdim(0.0, 0.0);
1861 fdimf(0.0f, 0.0f);
1862 fdiml(0.0l, 0.0l);
1863 fma(0.0, 0.0, 0.0);
1864 fmaf(0.0f, 0.0f, 0.0f);
1865 fmal(0.0l, 0.0l, 0.0l);
1866 fmax(0.0, 0.0);
1867 fmaxf(0.0f, 0.0f);
1868 fmaxl(0.0l, 0.0l);
1869 fmin(0.0, 0.0);
1870 fminf(0.0f, 0.0f);
1871 fminl(0.0l, 0.0l);
1872 hypot(0.0, 0.0);
1873 hypotf(0.0f, 0.0f);
1874 hypotl(0.0l, 0.0l);
1875 ilogb(0.0);
1876 ilogbf(0.0f);
1877 ilogbl(0.0l);
1878 lgamma(0.0);
1879 lgammaf(0.0f);
1880 lgammal(0.0l);
1881 #ifndef __APPLE__ /* see below */
1882 llrint(0.0);
1883 llrintf(0.0f);
1884 llrintl(0.0l);
1885 llround(0.0);
1886 llroundf(0.0f);
1887 llroundl(0.0l);
1888 #endif
1889 log1p(0.0);
1890 log1pf(0.0f);
1891 log1pl(0.0l);
1892 log2(0.0);
1893 log2f(0.0f);
1894 log2l(0.0l);
1895 logb(0.0);
1896 logbf(0.0f);
1897 logbl(0.0l);
1898 lrint(0.0);
1899 lrintf(0.0f);
1900 lrintl(0.0l);
1901 lround(0.0);
1902 lroundf(0.0f);
1903 lroundl(0.0l);
1904 nan(0);
1905 nanf(0);
1906 nanl(0);
1907 nearbyint(0.0);
1908 nearbyintf(0.0f);
1909 nearbyintl(0.0l);
1910 nextafter(0.0, 0.0);
1911 nextafterf(0.0f, 0.0f);
1912 nextafterl(0.0l, 0.0l);
1913 nexttoward(0.0, 0.0);
1914 nexttowardf(0.0f, 0.0f);
1915 nexttowardl(0.0l, 0.0l);
1916 remainder(0.0, 0.0);
1917 remainderf(0.0f, 0.0f);
1918 remainderl(0.0l, 0.0l);
1919 remquo(0.0, 0.0, 0);
1920 remquof(0.0f, 0.0f, 0);
1921 remquol(0.0l, 0.0l, 0);
1922 rint(0.0);
1923 rintf(0.0f);
1924 rintl(0.0l);
1925 round(0.0);
1926 roundf(0.0f);
1927 roundl(0.0l);
1928 scalbln(0.0, 0l);
1929 scalblnf(0.0f, 0l);
1930 scalblnl(0.0l, 0l);
1931 scalbn(0.0, 0);
1932 scalbnf(0.0f, 0);
1933 scalbnl(0.0l, 0);
1934 tgamma(0.0);
1935 tgammaf(0.0f);
1936 tgammal(0.0l);
1937 trunc(0.0);
1938 truncf(0.0f);
1939 truncl(0.0l);
1940 ],[glibcxx_cv_c99_math_tr1=yes], [glibcxx_cv_c99_math_tr1=no])
1941 ])
1942 AC_MSG_RESULT($glibcxx_cv_c99_math_tr1)
1943 if test x"$glibcxx_cv_c99_math_tr1" = x"yes"; then
1944 AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
1945 [Define if C99 functions or macros in <math.h> should be imported
1946 in <tr1/cmath> in namespace std::tr1.])
1948 case "${target_os}" in
1949 darwin*)
1950 AC_MSG_CHECKING([for ISO C99 rounding functions in <math.h>])
1951 AC_CACHE_VAL(glibcxx_cv_c99_math_llround, [
1952 AC_TRY_COMPILE([#include <math.h>],
1953 [llrint(0.0);
1954 llrintf(0.0f);
1955 llrintl(0.0l);
1956 llround(0.0);
1957 llroundf(0.0f);
1958 llroundl(0.0l);
1959 ],
1960 [glibcxx_cv_c99_math_llround=yes],
1961 [glibcxx_cv_c99_math_llround=no])
1962 ])
1963 AC_MSG_RESULT($glibcxx_cv_c99_math_llround)
1964 ;;
1965 esac
1966 if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
1967 AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
1968 [Define if C99 llrint and llround functions are missing from <math.h>.])
1969 fi
1970 fi
1972 # Check for the existence of <inttypes.h> functions (NB: doesn't make
1973 # sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1974 ac_c99_inttypes_tr1=no;
1975 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1976 AC_MSG_CHECKING([for ISO C99 support to TR1 in <inttypes.h>])
1977 AC_TRY_COMPILE([#include <inttypes.h>],
1978 [intmax_t i, numer, denom, base;
1979 const char* s;
1980 char** endptr;
1981 intmax_t ret = imaxabs(i);
1982 imaxdiv_t dret = imaxdiv(numer, denom);
1983 ret = strtoimax(s, endptr, base);
1984 uintmax_t uret = strtoumax(s, endptr, base);
1985 ],[ac_c99_inttypes_tr1=yes], [ac_c99_inttypes_tr1=no])
1986 fi
1987 AC_MSG_RESULT($ac_c99_inttypes_tr1)
1988 if test x"$ac_c99_inttypes_tr1" = x"yes"; then
1989 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_TR1, 1,
1990 [Define if C99 functions in <inttypes.h> should be imported in
1991 <tr1/cinttypes> in namespace std::tr1.])
1992 fi
1994 # Check for the existence of wchar_t <inttypes.h> functions (NB: doesn't
1995 # make sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1996 ac_c99_inttypes_wchar_t_tr1=no;
1997 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1998 AC_MSG_CHECKING([for wchar_t ISO C99 support to TR1 in <inttypes.h>])
1999 AC_TRY_COMPILE([#include <inttypes.h>],
2000 [intmax_t base;
2001 const wchar_t* s;
2002 wchar_t** endptr;
2003 intmax_t ret = wcstoimax(s, endptr, base);
2004 uintmax_t uret = wcstoumax(s, endptr, base);
2005 ],[ac_c99_inttypes_wchar_t_tr1=yes],
2006 [ac_c99_inttypes_wchar_t_tr1=no])
2007 fi
2008 AC_MSG_RESULT($ac_c99_inttypes_wchar_t_tr1)
2009 if test x"$ac_c99_inttypes_wchar_t_tr1" = x"yes"; then
2010 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1, 1,
2011 [Define if wchar_t C99 functions in <inttypes.h> should be
2012 imported in <tr1/cinttypes> in namespace std::tr1.])
2013 fi
2015 # Check for the existence of the <stdbool.h> header.
2016 AC_CHECK_HEADERS(stdbool.h)
2018 # Check for the existence of the <stdalign.h> header.
2019 AC_CHECK_HEADERS(stdalign.h)
2021 CXXFLAGS="$ac_save_CXXFLAGS"
2022 AC_LANG_RESTORE
2023 ])
2025 dnl
2026 dnl Check for uchar.h and usability.
2027 dnl
2028 AC_DEFUN([GLIBCXX_CHECK_UCHAR_H], [
2030 # Test uchar.h.
2031 AC_CHECK_HEADERS(uchar.h, ac_has_uchar_h=yes, ac_has_uchar_h=no)
2033 AC_LANG_SAVE
2034 AC_LANG_CPLUSPLUS
2035 ac_save_CXXFLAGS="$CXXFLAGS"
2036 CXXFLAGS="$CXXFLAGS -std=c++11"
2038 if test x"$ac_has_uchar_h" = x"yes"; then
2039 AC_MSG_CHECKING([for ISO C11 support for <uchar.h>])
2040 AC_TRY_COMPILE([#include <uchar.h>
2041 #ifdef __STDC_UTF_16__
2042 long i = __STDC_UTF_16__;
2043 #endif
2044 #ifdef __STDC_UTF_32__
2045 long j = __STDC_UTF_32__;
2046 #endif
2047 namespace test
2048 {
2049 using ::c16rtomb;
2050 using ::c32rtomb;
2051 using ::mbrtoc16;
2052 using ::mbrtoc32;
2053 }
2054 ],
2055 [], [ac_c11_uchar_cxx11=yes], [ac_c11_uchar_cxx11=no])
2056 else
2057 ac_c11_uchar_cxx11=no
2058 fi
2059 AC_MSG_RESULT($ac_c11_uchar_cxx11)
2060 if test x"$ac_c11_uchar_cxx11" = x"yes"; then
2061 AC_DEFINE(_GLIBCXX_USE_C11_UCHAR_CXX11, 1,
2062 [Define if C11 functions in <uchar.h> should be imported into
2063 namespace std in <cuchar>.])
2064 fi
2066 CXXFLAGS="$ac_save_CXXFLAGS"
2067 AC_LANG_RESTORE
2068 ])
2071 dnl
2072 dnl Check whether "/dev/random" and "/dev/urandom" are available for
2073 dnl class std::random_device from C++ 2011 [rand.device], and
2074 dnl random_device of "TR1" (Chapter 5.1, "Random number generation").
2075 dnl
2076 AC_DEFUN([GLIBCXX_CHECK_DEV_RANDOM], [
2078 AC_MSG_CHECKING([for "/dev/random" and "/dev/urandom" for std::random_device])
2079 AC_CACHE_VAL(glibcxx_cv_dev_random, [
2080 if test -r /dev/random && test -r /dev/urandom; then
2081 ## For MSys environment the test above is detected as false-positive
2082 ## on mingw-targets. So disable it explicitly for them.
2083 case ${target_os} in
2084 *mingw*) glibcxx_cv_dev_random=no ;;
2085 *) glibcxx_cv_dev_random=yes ;;
2086 esac
2087 else
2088 glibcxx_cv_dev_random=no;
2089 fi
2090 ])
2091 AC_MSG_RESULT($glibcxx_cv_dev_random)
2093 if test x"$glibcxx_cv_dev_random" = x"yes"; then
2094 AC_DEFINE(_GLIBCXX_USE_DEV_RANDOM, 1,
2095 [Define if /dev/random and /dev/urandom are available for
2096 std::random_device.])
2097 AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1, 1,
2098 [Define if /dev/random and /dev/urandom are available for
2099 the random_device of TR1 (Chapter 5.1).])
2100 fi
2102 ])
2104 dnl
2105 dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
2106 dnl
2107 AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
2109 AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
2110 AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
2111 [#include <stdio.h>],
2112 [AC_MSG_ERROR([computing EOF failed])])
2113 ])
2114 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_EOF, $glibcxx_cv_stdio_eof,
2115 [Define to the value of the EOF integer constant.])
2117 AC_CACHE_CHECK([for the value of SEEK_CUR], glibcxx_cv_stdio_seek_cur, [
2118 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_cur], [[SEEK_CUR]],
2119 [#include <stdio.h>],
2120 [AC_MSG_ERROR([computing SEEK_CUR failed])])
2121 ])
2122 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_CUR, $glibcxx_cv_stdio_seek_cur,
2123 [Define to the value of the SEEK_CUR integer constant.])
2125 AC_CACHE_CHECK([for the value of SEEK_END], glibcxx_cv_stdio_seek_end, [
2126 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_end], [[SEEK_END]],
2127 [#include <stdio.h>],
2128 [AC_MSG_ERROR([computing SEEK_END failed])])
2129 ])
2130 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
2131 [Define to the value of the SEEK_END integer constant.])
2132 ])
2134 dnl
2135 dnl Check whether required C++ overloads are present in <stdio.h>.
2136 dnl
2137 AC_DEFUN([GLIBCXX_CHECK_STDIO_PROTO], [
2139 AC_LANG_SAVE
2140 AC_LANG_CPLUSPLUS
2141 # Use C++11 because a conforming <stdio.h> won't define gets for C++14,
2142 # and we don't need a declaration for C++14 anyway.
2143 ac_save_CXXFLAGS="$CXXFLAGS"
2144 CXXFLAGS="$CXXFLAGS -std=gnu++11"
2146 AC_MSG_CHECKING([for gets declaration])
2147 AC_CACHE_VAL(glibcxx_cv_gets, [
2148 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2149 [#include <stdio.h>
2150 namespace test
2151 {
2152 using ::gets;
2153 }
2154 ])],
2155 [glibcxx_cv_gets=yes],
2156 [glibcxx_cv_gets=no]
2157 )])
2159 if test $glibcxx_cv_gets = yes; then
2160 AC_DEFINE(HAVE_GETS, 1, [Define if gets is available in <stdio.h> before C++14.])
2161 fi
2162 AC_MSG_RESULT($glibcxx_cv_gets)
2164 CXXFLAGS="$ac_save_CXXFLAGS"
2165 AC_LANG_RESTORE
2166 ])
2168 dnl
2169 dnl Check whether required C++11 overloads for floating point and integral
2170 dnl types are present in <math.h>.
2171 dnl
2172 AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
2174 AC_LANG_SAVE
2175 AC_LANG_CPLUSPLUS
2176 ac_save_CXXFLAGS="$CXXFLAGS"
2177 CXXFLAGS="$CXXFLAGS -std=c++11"
2179 case "$host" in
2180 *-*-solaris2.*)
2181 # Solaris 12 Build 86, Solaris 11.3 SRU 3.6, and Solaris 10 Patch
2182 # 11996[67]-02 introduced the C++11 <math.h> floating point overloads.
2183 AC_MSG_CHECKING([for C++11 <math.h> floating point overloads])
2184 AC_CACHE_VAL(glibcxx_cv_math11_fp_overload, [
2185 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2186 [#include <math.h>
2187 #undef isfinite
2188 namespace std {
2189 inline bool isfinite(float __x)
2190 { return __builtin_isfinite(__x); }
2191 }
2192 ])],
2193 [glibcxx_cv_math11_fp_overload=no],
2194 [glibcxx_cv_math11_fp_overload=yes]
2195 )])
2197 # autoheader cannot handle indented templates.
2198 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_FP],
2199 [/* Define if all C++11 floating point overloads are available in <math.h>. */
2200 #if __cplusplus >= 201103L
2201 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
2202 #endif])
2204 if test $glibcxx_cv_math11_fp_overload = yes; then
2205 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_FP)
2206 fi
2207 AC_MSG_RESULT([$glibcxx_cv_math11_fp_overload])
2209 # Solaris 12 Build 90, Solaris 11.3 SRU 5.6, and Solaris 10 Patch
2210 # 11996[67]-02 introduced the C++11 <math.h> integral type overloads.
2211 AC_MSG_CHECKING([for C++11 <math.h> integral type overloads])
2212 AC_CACHE_VAL(glibcxx_cv_math11_int_overload, [
2213 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2214 [#include <math.h>
2215 namespace std {
2216 template<typename _Tp>
2217 struct __is_integer;
2218 template<>
2219 struct __is_integer<int>
2220 {
2221 enum { __value = 1 };
2222 };
2223 }
2224 namespace __gnu_cxx {
2225 template<bool, typename>
2226 struct __enable_if;
2227 template<typename _Tp>
2228 struct __enable_if<true, _Tp>
2229 { typedef _Tp __type; };
2230 }
2231 namespace std {
2232 template<typename _Tp>
2233 constexpr typename __gnu_cxx::__enable_if
2234 <__is_integer<_Tp>::__value, double>::__type
2235 log2(_Tp __x)
2236 { return __builtin_log2(__x); }
2237 }
2238 int
2239 main (void)
2240 {
2241 int i = 1000;
2242 return std::log2(i);
2243 }
2244 ])],
2245 [glibcxx_cv_math11_int_overload=no],
2246 [glibcxx_cv_math11_int_overload=yes]
2247 )])
2249 # autoheader cannot handle indented templates.
2250 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_INT],
2251 [/* Define if all C++11 integral type overloads are available in <math.h>. */
2252 #if __cplusplus >= 201103L
2253 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
2254 #endif])
2256 if test $glibcxx_cv_math11_int_overload = yes; then
2257 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_INT)
2258 fi
2259 AC_MSG_RESULT([$glibcxx_cv_math11_int_overload])
2260 ;;
2261 *)
2262 # If <math.h> defines the obsolete isinf(double) and isnan(double)
2263 # functions (instead of or as well as the C99 generic macros) then we
2264 # can't define std::isinf(double) and std::isnan(double) in <cmath>
2265 # and must use the ones from <math.h> instead.
2266 AC_MSG_CHECKING([for obsolete isinf function in <math.h>])
2267 AC_CACHE_VAL(glibcxx_cv_obsolete_isinf, [
2268 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2269 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2270 #include <math.h>
2271 #undef isinf
2272 namespace std {
2273 using ::isinf;
2274 bool isinf(float);
2275 bool isinf(long double);
2276 }
2277 using std::isinf;
2278 bool b = isinf(0.0);
2279 ])],
2280 [glibcxx_cv_obsolete_isinf=yes],
2281 [glibcxx_cv_obsolete_isinf=no]
2282 )])
2283 AC_MSG_RESULT([$glibcxx_cv_obsolete_isinf])
2284 if test $glibcxx_cv_obsolete_isinf = yes; then
2285 AC_DEFINE(HAVE_OBSOLETE_ISINF, 1,
2286 [Define if <math.h> defines obsolete isinf function.])
2287 fi
2289 AC_MSG_CHECKING([for obsolete isnan function in <math.h>])
2290 AC_CACHE_VAL(glibcxx_cv_obsolete_isnan, [
2291 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2292 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2293 #include <math.h>
2294 #undef isnan
2295 namespace std {
2296 using ::isnan;
2297 bool isnan(float);
2298 bool isnan(long double);
2299 }
2300 using std::isnan;
2301 bool b = isnan(0.0);
2302 ])],
2303 [glibcxx_cv_obsolete_isnan=yes],
2304 [glibcxx_cv_obsolete_isnan=no]
2305 )])
2306 AC_MSG_RESULT([$glibcxx_cv_obsolete_isnan])
2307 if test $glibcxx_cv_obsolete_isnan = yes; then
2308 AC_DEFINE(HAVE_OBSOLETE_ISNAN, 1,
2309 [Define if <math.h> defines obsolete isnan function.])
2310 fi
2311 ;;
2312 esac
2314 CXXFLAGS="$ac_save_CXXFLAGS"
2315 AC_LANG_RESTORE
2316 ])
2318 dnl
2319 dnl Check for what type of C headers to use.
2320 dnl
2321 dnl --enable-cheaders= [does stuff].
2322 dnl --disable-cheaders [does not do anything, really].
2323 dnl + Usage: GLIBCXX_ENABLE_CHEADERS[(DEFAULT)]
2324 dnl Where DEFAULT is either 'c' or 'c_global' or 'c_std'.
2325 dnl
2326 dnl To use the obsolete 'c_std' headers use --enable-cheaders-obsolete as
2327 dnl well as --enable-cheaders=c_std, otherwise configure will fail.
2328 dnl
2329 AC_DEFUN([GLIBCXX_ENABLE_CHEADERS], [
2330 GLIBCXX_ENABLE(cheaders-obsolete,no,,
2331 [allow use of obsolete "C" headers for g++])
2332 GLIBCXX_ENABLE(cheaders,$1,[[[=KIND]]],
2333 [construct "C" headers for g++], [permit c|c_global|c_std])
2334 AC_MSG_NOTICE("C" header strategy set to $enable_cheaders)
2335 if test $enable_cheaders = c_std ; then
2336 AC_MSG_WARN([the --enable-cheaders=c_std configuration is obsolete, c_global should be used instead])
2337 AC_MSG_WARN([if you are unable to use c_global please report a bug or inform libstdc++@gcc.gnu.org])
2338 if test $enable_cheaders_obsolete != yes ; then
2339 AC_MSG_ERROR(use --enable-cheaders-obsolete to use c_std "C" headers)
2340 fi
2341 fi
2343 C_INCLUDE_DIR='${glibcxx_srcdir}/include/'$enable_cheaders
2345 # Allow overrides to configure.host here.
2346 if test $enable_cheaders = c_global; then
2347 c_compatibility=yes
2348 fi
2350 AC_SUBST(C_INCLUDE_DIR)
2351 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C, test $enable_cheaders = c)
2352 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_STD, test $enable_cheaders = c_std)
2353 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_GLOBAL, test $enable_cheaders = c_global)
2354 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_COMPATIBILITY, test $c_compatibility = yes)
2355 ])
2358 dnl
2359 dnl Check for which locale library to use. The choice is mapped to
2360 dnl a subdirectory of config/locale.
2361 dnl
2362 dnl Default is generic.
2363 dnl
2364 AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
2365 GLIBCXX_ENABLE(clocale,auto,[[[=MODEL]]],
2366 [use MODEL for target locale package],
2367 [permit generic|gnu|ieee_1003.1-2001|newlib|yes|no|auto])
2369 # Deal with gettext issues. Default to not using it (=no) until we detect
2370 # support for it later. Let the user turn it off via --e/d, but let that
2371 # default to on for easier handling.
2372 USE_NLS=no
2373 AC_ARG_ENABLE(nls,
2374 AC_HELP_STRING([--enable-nls],[use Native Language Support (default)]),
2375 [],
2376 [enable_nls=yes])
2378 # Either a known package, or "auto"
2379 if test $enable_clocale = no || test $enable_clocale = yes; then
2380 enable_clocale=auto
2381 fi
2382 enable_clocale_flag=$enable_clocale
2384 # Probe for locale model to use if none specified.
2385 # Default to "generic".
2386 if test $enable_clocale_flag = auto; then
2387 case ${target_os} in
2388 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2389 enable_clocale_flag=gnu
2390 ;;
2391 darwin*)
2392 enable_clocale_flag=darwin
2393 ;;
2394 vxworks*)
2395 enable_clocale_flag=vxworks
2396 ;;
2397 dragonfly* | freebsd*)
2398 enable_clocale_flag=dragonfly
2399 ;;
2400 openbsd*)
2401 enable_clocale_flag=newlib
2402 ;;
2403 *)
2404 if test x"$with_newlib" = x"yes"; then
2405 enable_clocale_flag=newlib
2406 else
2407 enable_clocale_flag=generic
2408 fi
2409 ;;
2410 esac
2411 fi
2413 # Sanity check model, and test for special functionality.
2414 if test $enable_clocale_flag = gnu; then
2415 AC_EGREP_CPP([_GLIBCXX_ok], [
2416 #include <features.h>
2417 #if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined(__UCLIBC__)
2418 _GLIBCXX_ok
2419 #endif
2420 ], enable_clocale_flag=gnu, enable_clocale_flag=generic)
2422 # Set it to scream when it hurts.
2423 ac_save_CFLAGS="$CFLAGS"
2424 CFLAGS="-Wimplicit-function-declaration -Werror"
2426 # Use strxfrm_l if available.
2427 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2428 #include <string.h>
2429 #include <locale.h>],
2430 [char s[128]; __locale_t loc; strxfrm_l(s, "C", 5, loc);],
2431 AC_DEFINE(HAVE_STRXFRM_L, 1,
2432 [Define if strxfrm_l is available in <string.h>.]),)
2434 # Use strerror_l if available.
2435 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2436 #include <string.h>
2437 #include <locale.h>],
2438 [__locale_t loc; strerror_l(5, loc);],
2439 AC_DEFINE(HAVE_STRERROR_L, 1,
2440 [Define if strerror_l is available in <string.h>.]),)
2442 CFLAGS="$ac_save_CFLAGS"
2443 fi
2445 # Perhaps use strerror_r if available, and strerror_l isn't.
2446 ac_save_CFLAGS="$CFLAGS"
2447 CFLAGS="-Wimplicit-function-declaration -Werror"
2448 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2449 #include <string.h>
2450 #include <locale.h>],
2451 [char s[128]; strerror_r(5, s, 128);],
2452 AC_DEFINE(HAVE_STRERROR_R, 1,
2453 [Define if strerror_r is available in <string.h>.]),)
2454 CFLAGS="$ac_save_CFLAGS"
2456 # Set configure bits for specified locale package
2457 AC_MSG_CHECKING([for C locale to use])
2458 case ${enable_clocale_flag} in
2459 generic)
2460 AC_MSG_RESULT(generic)
2462 CLOCALE_H=config/locale/generic/c_locale.h
2463 CLOCALE_CC=config/locale/generic/c_locale.cc
2464 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2465 CCOLLATE_CC=config/locale/generic/collate_members.cc
2466 CCTYPE_CC=config/locale/generic/ctype_members.cc
2467 CMESSAGES_H=config/locale/generic/messages_members.h
2468 CMESSAGES_CC=config/locale/generic/messages_members.cc
2469 CMONEY_CC=config/locale/generic/monetary_members.cc
2470 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2471 CTIME_H=config/locale/generic/time_members.h
2472 CTIME_CC=config/locale/generic/time_members.cc
2473 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2474 ;;
2475 darwin)
2476 AC_MSG_RESULT(darwin)
2478 CLOCALE_H=config/locale/generic/c_locale.h
2479 CLOCALE_CC=config/locale/generic/c_locale.cc
2480 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2481 CCOLLATE_CC=config/locale/generic/collate_members.cc
2482 CCTYPE_CC=config/locale/darwin/ctype_members.cc
2483 CMESSAGES_H=config/locale/generic/messages_members.h
2484 CMESSAGES_CC=config/locale/generic/messages_members.cc
2485 CMONEY_CC=config/locale/generic/monetary_members.cc
2486 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2487 CTIME_H=config/locale/generic/time_members.h
2488 CTIME_CC=config/locale/generic/time_members.cc
2489 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2490 ;;
2491 vxworks)
2492 AC_MSG_RESULT(vxworks)
2494 CLOCALE_H=config/locale/generic/c_locale.h
2495 CLOCALE_CC=config/locale/generic/c_locale.cc
2496 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2497 CCOLLATE_CC=config/locale/generic/collate_members.cc
2498 CCTYPE_CC=config/locale/vxworks/ctype_members.cc
2499 CMESSAGES_H=config/locale/generic/messages_members.h
2500 CMESSAGES_CC=config/locale/generic/messages_members.cc
2501 CMONEY_CC=config/locale/generic/monetary_members.cc
2502 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2503 CTIME_H=config/locale/generic/time_members.h
2504 CTIME_CC=config/locale/generic/time_members.cc
2505 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2506 ;;
2507 dragonfly)
2508 AC_MSG_RESULT(dragonfly or freebsd)
2510 CLOCALE_H=config/locale/dragonfly/c_locale.h
2511 CLOCALE_CC=config/locale/dragonfly/c_locale.cc
2512 CCODECVT_CC=config/locale/dragonfly/codecvt_members.cc
2513 CCOLLATE_CC=config/locale/dragonfly/collate_members.cc
2514 CCTYPE_CC=config/locale/dragonfly/ctype_members.cc
2515 CMESSAGES_H=config/locale/generic/messages_members.h
2516 CMESSAGES_CC=config/locale/generic/messages_members.cc
2517 CMONEY_CC=config/locale/dragonfly/monetary_members.cc
2518 CNUMERIC_CC=config/locale/dragonfly/numeric_members.cc
2519 CTIME_H=config/locale/dragonfly/time_members.h
2520 CTIME_CC=config/locale/dragonfly/time_members.cc
2521 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2522 ;;
2524 gnu)
2525 AC_MSG_RESULT(gnu)
2527 # Declare intention to use gettext, and add support for specific
2528 # languages.
2529 # For some reason, ALL_LINGUAS has to be before AM-GNU-GETTEXT
2530 ALL_LINGUAS="de fr"
2532 # Don't call AM-GNU-GETTEXT here. Instead, assume glibc.
2533 AC_CHECK_PROG(check_msgfmt, msgfmt, yes, no)
2534 if test x"$check_msgfmt" = x"yes" && test x"$enable_nls" = x"yes"; then
2535 USE_NLS=yes
2536 fi
2537 # Export the build objects.
2538 for ling in $ALL_LINGUAS; do \
2539 glibcxx_MOFILES="$glibcxx_MOFILES $ling.mo"; \
2540 glibcxx_POFILES="$glibcxx_POFILES $ling.po"; \
2541 done
2542 AC_SUBST(glibcxx_MOFILES)
2543 AC_SUBST(glibcxx_POFILES)
2545 CLOCALE_H=config/locale/gnu/c_locale.h
2546 CLOCALE_CC=config/locale/gnu/c_locale.cc
2547 CCODECVT_CC=config/locale/gnu/codecvt_members.cc
2548 CCOLLATE_CC=config/locale/gnu/collate_members.cc
2549 CCTYPE_CC=config/locale/gnu/ctype_members.cc
2550 CMESSAGES_H=config/locale/gnu/messages_members.h
2551 CMESSAGES_CC=config/locale/gnu/messages_members.cc
2552 CMONEY_CC=config/locale/gnu/monetary_members.cc
2553 CNUMERIC_CC=config/locale/gnu/numeric_members.cc
2554 CTIME_H=config/locale/gnu/time_members.h
2555 CTIME_CC=config/locale/gnu/time_members.cc
2556 CLOCALE_INTERNAL_H=config/locale/gnu/c++locale_internal.h
2557 ;;
2558 ieee_1003.1-2001)
2559 AC_MSG_RESULT(IEEE 1003.1)
2561 CLOCALE_H=config/locale/ieee_1003.1-2001/c_locale.h
2562 CLOCALE_CC=config/locale/ieee_1003.1-2001/c_locale.cc
2563 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2564 CCOLLATE_CC=config/locale/generic/collate_members.cc
2565 CCTYPE_CC=config/locale/generic/ctype_members.cc
2566 CMESSAGES_H=config/locale/ieee_1003.1-2001/messages_members.h
2567 CMESSAGES_CC=config/locale/ieee_1003.1-2001/messages_members.cc
2568 CMONEY_CC=config/locale/generic/monetary_members.cc
2569 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2570 CTIME_H=config/locale/generic/time_members.h
2571 CTIME_CC=config/locale/generic/time_members.cc
2572 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2573 ;;
2574 newlib)
2575 AC_MSG_RESULT(newlib)
2577 CLOCALE_H=config/locale/generic/c_locale.h
2578 CLOCALE_CC=config/locale/generic/c_locale.cc
2579 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2580 CCOLLATE_CC=config/locale/generic/collate_members.cc
2581 CCTYPE_CC=config/locale/newlib/ctype_members.cc
2582 CMESSAGES_H=config/locale/generic/messages_members.h
2583 CMESSAGES_CC=config/locale/generic/messages_members.cc
2584 CMONEY_CC=config/locale/generic/monetary_members.cc
2585 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2586 CTIME_H=config/locale/generic/time_members.h
2587 CTIME_CC=config/locale/generic/time_members.cc
2588 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2589 ;;
2590 esac
2592 # This is where the testsuite looks for locale catalogs, using the
2593 # -DLOCALEDIR define during testsuite compilation.
2594 glibcxx_localedir=${glibcxx_builddir}/po/share/locale
2595 AC_SUBST(glibcxx_localedir)
2597 # A standalone libintl (e.g., GNU libintl) may be in use.
2598 if test $USE_NLS = yes; then
2599 AC_CHECK_HEADERS([libintl.h], [], USE_NLS=no)
2600 AC_SEARCH_LIBS(gettext, intl, [], USE_NLS=no)
2601 fi
2602 if test $USE_NLS = yes; then
2603 AC_DEFINE(_GLIBCXX_USE_NLS, 1,
2604 [Define if NLS translations are to be used.])
2605 fi
2607 AC_SUBST(USE_NLS)
2608 AC_SUBST(CLOCALE_H)
2609 AC_SUBST(CMESSAGES_H)
2610 AC_SUBST(CCODECVT_CC)
2611 AC_SUBST(CCOLLATE_CC)
2612 AC_SUBST(CCTYPE_CC)
2613 AC_SUBST(CMESSAGES_CC)
2614 AC_SUBST(CMONEY_CC)
2615 AC_SUBST(CNUMERIC_CC)
2616 AC_SUBST(CTIME_H)
2617 AC_SUBST(CTIME_CC)
2618 AC_SUBST(CLOCALE_CC)
2619 AC_SUBST(CLOCALE_INTERNAL_H)
2620 ])
2623 dnl
2624 dnl Check for which std::allocator base class to use. The choice is
2625 dnl mapped from a subdirectory of include/ext.
2626 dnl
2627 dnl Default is new.
2628 dnl
2629 AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
2630 AC_MSG_CHECKING([for std::allocator base class])
2631 GLIBCXX_ENABLE(libstdcxx-allocator,auto,[[[=KIND]]],
2632 [use KIND for target std::allocator base],
2633 [permit new|malloc|mt|bitmap|pool|yes|no|auto])
2635 # If they didn't use this option switch, or if they specified --enable
2636 # with no specific model, we'll have to look for one. If they
2637 # specified --disable (???), do likewise.
2638 if test $enable_libstdcxx_allocator = no ||
2639 test $enable_libstdcxx_allocator = yes;
2640 then
2641 enable_libstdcxx_allocator=auto
2642 fi
2644 # Either a known package, or "auto". Auto implies the default choice
2645 # for a particular platform.
2646 enable_libstdcxx_allocator_flag=$enable_libstdcxx_allocator
2648 # Probe for host-specific support if no specific model is specified.
2649 # Default to "new".
2650 if test $enable_libstdcxx_allocator_flag = auto; then
2651 case ${target_os} in
2652 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2653 enable_libstdcxx_allocator_flag=new
2654 ;;
2655 *)
2656 enable_libstdcxx_allocator_flag=new
2657 ;;
2658 esac
2659 fi
2660 AC_MSG_RESULT($enable_libstdcxx_allocator_flag)
2663 # Set configure bits for specified locale package
2664 case ${enable_libstdcxx_allocator_flag} in
2665 bitmap)
2666 ALLOCATOR_H=config/allocator/bitmap_allocator_base.h
2667 ALLOCATOR_NAME=__gnu_cxx::bitmap_allocator
2668 ;;
2669 malloc)
2670 ALLOCATOR_H=config/allocator/malloc_allocator_base.h
2671 ALLOCATOR_NAME=__gnu_cxx::malloc_allocator
2672 ;;
2673 mt)
2674 ALLOCATOR_H=config/allocator/mt_allocator_base.h
2675 ALLOCATOR_NAME=__gnu_cxx::__mt_alloc
2676 ;;
2677 new)
2678 ALLOCATOR_H=config/allocator/new_allocator_base.h
2679 ALLOCATOR_NAME=__gnu_cxx::new_allocator
2680 ;;
2681 pool)
2682 ALLOCATOR_H=config/allocator/pool_allocator_base.h
2683 ALLOCATOR_NAME=__gnu_cxx::__pool_alloc
2684 ;;
2685 esac
2687 GLIBCXX_CONDITIONAL(ENABLE_ALLOCATOR_NEW,
2688 test $enable_libstdcxx_allocator_flag = new)
2689 AC_SUBST(ALLOCATOR_H)
2690 AC_SUBST(ALLOCATOR_NAME)
2691 ])
2694 dnl
2695 dnl Check for whether the Boost-derived checks should be turned on.
2696 dnl
2697 dnl --enable-concept-checks turns them on.
2698 dnl --disable-concept-checks leaves them off.
2699 dnl + Usage: GLIBCXX_ENABLE_CONCEPT_CHECKS[(DEFAULT)]
2700 dnl Where DEFAULT is either `yes' or `no'.
2701 dnl
2702 AC_DEFUN([GLIBCXX_ENABLE_CONCEPT_CHECKS], [
2703 GLIBCXX_ENABLE(concept-checks,$1,,[use Boost-derived template checks])
2704 if test $enable_concept_checks = yes; then
2705 AC_DEFINE(_GLIBCXX_CONCEPT_CHECKS, 1,
2706 [Define to use concept checking code from the boost libraries.])
2707 fi
2708 ])
2710 dnl
2711 dnl Use extern templates.
2712 dnl
2713 dnl --enable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 1
2714 dnl --disable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 0
2716 dnl + Usage: GLIBCXX_ENABLE_TEMPLATE[(DEFAULT)]
2717 dnl Where DEFAULT is `yes' or `no'.
2718 dnl
2719 AC_DEFUN([GLIBCXX_ENABLE_EXTERN_TEMPLATE], [
2721 GLIBCXX_ENABLE(extern-template,$1,,[enable extern template])
2723 AC_MSG_CHECKING([for extern template support])
2724 AC_MSG_RESULT([$enable_extern_template])
2726 GLIBCXX_CONDITIONAL(ENABLE_EXTERN_TEMPLATE, test $enable_extern_template = yes)
2727 ])
2729 dnl
2730 dnl Use vtable verification.
2731 dnl
2732 dnl --enable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 1
2733 dnl --disable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 0
2735 dnl + Usage: GLIBCXX_ENABLE_VTABLE_VERIFY[(DEFAULT)]
2736 dnl Where DEFAULT is `yes' or `no'.
2737 dnl
2738 AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY], [
2740 GLIBCXX_ENABLE(vtable-verify,$1,,[enable vtable verify])
2742 AC_MSG_CHECKING([for vtable verify support])
2743 AC_MSG_RESULT([$enable_vtable_verify])
2745 vtv_cygmin=no
2746 if test $enable_vtable_verify = yes; then
2747 case ${target_os} in
2748 cygwin*|mingw32*)
2749 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2750 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2751 vtv_cygmin=yes
2752 ;;
2753 darwin*)
2754 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u,_vtable_map_vars_start -Wl,-u,_vtable_map_vars_end"
2755 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-rpath,${toplevel_builddir}/libvtv/.libs"
2756 ;;
2757 solaris2*)
2758 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2759 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-R -Wl,${toplevel_builddir}/libvtv/.libs"
2760 ;;
2761 *)
2762 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2763 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2764 ;;
2765 esac
2766 VTV_PCH_CXXFLAGS="-fvtable-verify=std"
2767 else
2768 VTV_CXXFLAGS=
2769 VTV_PCH_CXXFLAGS=
2770 VTV_CXXLINKFLAGS=
2771 fi
2773 AC_SUBST(VTV_CXXFLAGS)
2774 AC_SUBST(VTV_PCH_CXXFLAGS)
2775 AC_SUBST(VTV_CXXLINKFLAGS)
2776 AM_CONDITIONAL(VTV_CYGMIN, test x$vtv_cygmin = xyes)
2777 GLIBCXX_CONDITIONAL(ENABLE_VTABLE_VERIFY, test $enable_vtable_verify = yes)
2778 ])
2780 dnl
2781 dnl Check for parallel mode pre-requisites, including OpenMP support.
2782 dnl
2783 dnl + Usage: GLIBCXX_ENABLE_PARALLEL
2784 dnl
2785 AC_DEFUN([GLIBCXX_ENABLE_PARALLEL], [
2787 enable_parallel=no;
2789 # See if configured libgomp/omp.h exists. (libgomp may be in
2790 # noconfigdirs but not explicitly disabled.)
2791 if echo " ${TARGET_CONFIGDIRS} " | grep " libgomp " > /dev/null 2>&1 ; then
2792 enable_parallel=yes;
2793 else
2794 AC_MSG_NOTICE([target-libgomp not built])
2795 fi
2797 AC_MSG_CHECKING([for parallel mode support])
2798 AC_MSG_RESULT([$enable_parallel])
2799 ])
2802 dnl
2803 dnl Check for which I/O library to use: stdio and POSIX, or pure stdio.
2804 dnl
2805 dnl Default is stdio_posix.
2806 dnl
2807 AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
2808 AC_MSG_CHECKING([for underlying I/O to use])
2809 GLIBCXX_ENABLE(cstdio,stdio,[[[=PACKAGE]]],
2810 [use target-specific I/O package], [permit stdio|stdio_posix|stdio_pure])
2812 # The only available I/O model is based on stdio, via basic_file_stdio.
2813 # The default "stdio" is actually "stdio + POSIX" because it uses fdopen(3)
2814 # to get a file descriptor and then uses read(3) and write(3) with it.
2815 # The "stdio_pure" model doesn't use fdopen and only uses FILE* for I/O.
2816 case ${enable_cstdio} in
2817 stdio*)
2818 CSTDIO_H=config/io/c_io_stdio.h
2819 BASIC_FILE_H=config/io/basic_file_stdio.h
2820 BASIC_FILE_CC=config/io/basic_file_stdio.cc
2821 AC_MSG_RESULT(stdio)
2823 if test "x$enable_cstdio" = "xstdio_pure" ; then
2824 AC_DEFINE(_GLIBCXX_USE_STDIO_PURE, 1,
2825 [Define to restrict std::__basic_file<> to stdio APIs.])
2826 fi
2827 ;;
2828 esac
2830 AC_SUBST(CSTDIO_H)
2831 AC_SUBST(BASIC_FILE_H)
2832 AC_SUBST(BASIC_FILE_CC)
2833 ])
2836 dnl
2837 dnl Check for "unusual" flags to pass to the compiler while building.
2838 dnl
2839 dnl --enable-cxx-flags='-foo -bar -baz' is a general method for passing
2840 dnl experimental flags such as -fpch, -fIMI, -Dfloat=char, etc.
2841 dnl --disable-cxx-flags passes nothing.
2842 dnl + See http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00131.html
2843 dnl http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00284.html
2844 dnl http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00035.html
2845 dnl + Usage: GLIBCXX_ENABLE_CXX_FLAGS(default flags)
2846 dnl If "default flags" is an empty string, the effect is the same
2847 dnl as --disable or --enable=no.
2848 dnl
2849 AC_DEFUN([GLIBCXX_ENABLE_CXX_FLAGS], [dnl
2850 AC_MSG_CHECKING([for extra compiler flags for building])
2851 GLIBCXX_ENABLE(cxx-flags,$1,[=FLAGS],
2852 [pass compiler FLAGS when building library],
2853 [case "x$enable_cxx_flags" in
2854 xno | x) enable_cxx_flags= ;;
2855 x-*) ;;
2856 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2857 esac])
2859 # Run through flags (either default or command-line) and set anything
2860 # extra (e.g., #defines) that must accompany particular g++ options.
2861 if test -n "$enable_cxx_flags"; then
2862 for f in $enable_cxx_flags; do
2863 case "$f" in
2864 -fhonor-std) ;;
2865 -*) ;;
2866 *) # and we're trying to pass /what/ exactly?
2867 AC_MSG_ERROR([compiler flags start with a -]) ;;
2868 esac
2869 done
2870 fi
2872 EXTRA_CXX_FLAGS="$enable_cxx_flags"
2873 AC_MSG_RESULT($EXTRA_CXX_FLAGS)
2874 AC_SUBST(EXTRA_CXX_FLAGS)
2875 ])
2878 dnl
2879 dnl Check to see if debugging libraries are to be built.
2880 dnl
2881 dnl --enable-libstdcxx-debug
2882 dnl builds a separate set of debugging libraries in addition to the
2883 dnl normal (shared, static) libstdc++ binaries.
2884 dnl
2885 dnl --disable-libstdcxx-debug
2886 dnl builds only one (non-debug) version of libstdc++.
2887 dnl
2888 dnl --enable-libstdcxx-debug-flags=FLAGS
2889 dnl iff --enable-debug == yes, then use FLAGS to build the debug library.
2890 dnl
2891 dnl + Usage: GLIBCXX_ENABLE_DEBUG[(DEFAULT)]
2892 dnl Where DEFAULT is either `yes' or `no'.
2893 dnl
2894 AC_DEFUN([GLIBCXX_ENABLE_DEBUG], [
2895 AC_MSG_CHECKING([for additional debug build])
2896 skip_debug_build=
2897 GLIBCXX_ENABLE(libstdcxx-debug,$1,,[build extra debug library])
2898 if test x$enable_libstdcxx_debug = xyes; then
2899 if test -f $toplevel_builddir/../stage_final \
2900 && test -f $toplevel_builddir/../stage_current; then
2901 stage_final=`cat $toplevel_builddir/../stage_final`
2902 stage_current=`cat $toplevel_builddir/../stage_current`
2903 if test x$stage_current != x$stage_final ; then
2904 skip_debug_build=" (skipped for bootstrap stage $stage_current)"
2905 enable_libstdcxx_debug=no
2906 fi
2907 fi
2908 fi
2909 AC_MSG_RESULT($enable_libstdcxx_debug$skip_debug_build)
2910 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_DEBUG, test $enable_libstdcxx_debug = yes)
2911 ])
2914 dnl
2915 dnl Check for explicit debug flags.
2916 dnl
2917 dnl --enable-libstdcxx-debug-flags='-O1'
2918 dnl is a general method for passing flags to be used when
2919 dnl building debug libraries with --enable-libstdcxx-debug.
2920 dnl
2921 dnl --disable-libstdcxx-debug-flags does nothing.
2922 dnl + Usage: GLIBCXX_ENABLE_DEBUG_FLAGS(default flags)
2923 dnl If "default flags" is an empty string, the effect is the same
2924 dnl as --disable or --enable=no.
2925 dnl
2926 AC_DEFUN([GLIBCXX_ENABLE_DEBUG_FLAGS], [
2927 GLIBCXX_ENABLE(libstdcxx-debug-flags,[$1],[=FLAGS],
2928 [pass compiler FLAGS when building debug library],
2929 [case "x$enable_libstdcxx_debug_flags" in
2930 xno | x) enable_libstdcxx_debug_flags= ;;
2931 x-*) ;;
2932 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2933 esac])
2935 # Option parsed, now set things appropriately
2936 DEBUG_FLAGS="$enable_libstdcxx_debug_flags"
2937 AC_SUBST(DEBUG_FLAGS)
2939 AC_MSG_NOTICE([Debug build flags set to $DEBUG_FLAGS])
2940 ])
2943 dnl
2944 dnl Check if the user only wants a freestanding library implementation.
2945 dnl
2946 dnl --disable-hosted-libstdcxx will turn off most of the library build,
2947 dnl installing only the headers required by [17.4.1.3] and the language
2948 dnl support library. More than that will be built (to keep the Makefiles
2949 dnl conveniently clean), but not installed.
2950 dnl
2951 dnl Sets:
2952 dnl is_hosted (yes/no)
2953 dnl
2954 dnl Defines:
2955 dnl _GLIBCXX_HOSTED (always defined, either to 1 or 0)
2956 dnl
2957 AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
2958 AC_ARG_ENABLE([hosted-libstdcxx],
2959 AC_HELP_STRING([--disable-hosted-libstdcxx],
2960 [only build freestanding C++ runtime support]),,
2961 [case "$host" in
2962 arm*-*-symbianelf*)
2963 enable_hosted_libstdcxx=no
2964 ;;
2965 *)
2966 enable_hosted_libstdcxx=yes
2967 ;;
2968 esac])
2969 if test "$enable_hosted_libstdcxx" = no; then
2970 AC_MSG_NOTICE([Only freestanding libraries will be built])
2971 is_hosted=no
2972 hosted_define=0
2973 enable_abi_check=no
2974 enable_libstdcxx_pch=no
2975 else
2976 is_hosted=yes
2977 hosted_define=1
2978 fi
2979 GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
2980 AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
2981 [Define to 1 if a full hosted library is built, or 0 if freestanding.])
2982 ])
2985 dnl
2986 dnl Check if the user wants a non-verbose library implementation.
2987 dnl
2988 dnl --disable-libstdcxx-verbose will turn off descriptive messages to
2989 dnl standard error on termination.
2990 dnl
2991 dnl Defines:
2992 dnl _GLIBCXX_VERBOSE (always defined, either to 1 or 0)
2993 dnl
2994 AC_DEFUN([GLIBCXX_ENABLE_VERBOSE], [
2995 AC_ARG_ENABLE([libstdcxx-verbose],
2996 AC_HELP_STRING([--disable-libstdcxx-verbose],
2997 [disable termination messages to standard error]),,
2998 [enable_libstdcxx_verbose=yes])
2999 if test x"$enable_libstdcxx_verbose" = xyes; then
3000 verbose_define=1
3001 else
3002 AC_MSG_NOTICE([verbose termination messages are disabled])
3003 verbose_define=0
3004 fi
3005 AC_DEFINE_UNQUOTED(_GLIBCXX_VERBOSE, $verbose_define,
3006 [Define to 1 if a verbose library is built, or 0 otherwise.])
3007 ])
3010 dnl
3011 dnl Check for template specializations for the 'long long' type.
3012 dnl The result determines only whether 'long long' I/O is enabled; things
3013 dnl like numeric_limits<> specializations are always available.
3014 dnl
3015 dnl --enable-long-long defines _GLIBCXX_USE_LONG_LONG
3016 dnl --disable-long-long leaves _GLIBCXX_USE_LONG_LONG undefined
3017 dnl + Usage: GLIBCXX_ENABLE_LONG_LONG[(DEFAULT)]
3018 dnl Where DEFAULT is either `yes' or `no'.
3019 dnl
3020 AC_DEFUN([GLIBCXX_ENABLE_LONG_LONG], [
3021 GLIBCXX_ENABLE(long-long,$1,,[enable template specializations for 'long long'])
3022 if test $enable_long_long = yes; then
3023 AC_DEFINE(_GLIBCXX_USE_LONG_LONG, 1,
3024 [Define if code specialized for long long should be used.])
3025 fi
3026 AC_MSG_CHECKING([for enabled long long specializations])
3027 AC_MSG_RESULT([$enable_long_long])
3028 ])
3031 dnl
3032 dnl Check for decimal floating point.
3033 dnl See:
3034 dnl http://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float
3035 dnl
3036 dnl This checks to see if the host supports decimal floating point types.
3037 dnl
3038 dnl Defines:
3039 dnl _GLIBCXX_USE_DECIMAL_FLOAT
3040 dnl
3041 AC_DEFUN([GLIBCXX_ENABLE_DECIMAL_FLOAT], [
3043 # Fake what AC_TRY_COMPILE does, without linking as this is
3044 # unnecessary for this test.
3046 cat > conftest.$ac_ext << EOF
3047 [#]line __oline__ "configure"
3048 int main()
3049 {
3050 _Decimal32 d1;
3051 _Decimal64 d2;
3052 _Decimal128 d3;
3053 return 0;
3054 }
3055 EOF
3057 AC_MSG_CHECKING([for ISO/IEC TR 24733 ])
3058 if AC_TRY_EVAL(ac_compile); then
3059 AC_DEFINE(_GLIBCXX_USE_DECIMAL_FLOAT, 1,
3060 [Define if ISO/IEC TR 24733 decimal floating point types are supported on this host.])
3061 enable_dfp=yes
3062 else
3063 enable_dfp=no
3064 fi
3065 AC_MSG_RESULT($enable_dfp)
3066 rm -f conftest*
3067 ])
3069 dnl
3070 dnl Check for GNU 128-bit floating point type.
3071 dnl
3072 dnl Note: also checks that the type isn't a standard types.
3073 dnl
3074 dnl Defines:
3075 dnl ENABLE_FLOAT128
3076 dnl
3077 AC_DEFUN([GLIBCXX_ENABLE_FLOAT128], [
3079 AC_LANG_SAVE
3080 AC_LANG_CPLUSPLUS
3082 # Fake what AC_TRY_COMPILE does, without linking as this is
3083 # unnecessary for this test.
3085 cat > conftest.$ac_ext << EOF
3086 [#]line __oline__ "configure"
3087 template<typename T1, typename T2>
3088 struct same
3089 { typedef T2 type; };
3091 template<typename T>
3092 struct same<T, T>;
3094 int main()
3095 {
3096 typename same<double, __float128>::type f1;
3097 typename same<long double, __float128>::type f2;
3098 }
3099 EOF
3101 AC_MSG_CHECKING([for __float128])
3102 if AC_TRY_EVAL(ac_compile); then
3103 enable_float128=yes
3104 else
3105 enable_float128=no
3106 fi
3107 AC_MSG_RESULT($enable_float128)
3108 GLIBCXX_CONDITIONAL(ENABLE_FLOAT128, test $enable_float128 = yes)
3109 rm -f conftest*
3111 AC_LANG_RESTORE
3112 ])
3114 dnl
3115 dnl Check for template specializations for the 'wchar_t' type.
3116 dnl
3117 dnl --enable-wchar_t defines _GLIBCXX_USE_WCHAR_T
3118 dnl --disable-wchar_t leaves _GLIBCXX_USE_WCHAR_T undefined
3119 dnl + Usage: GLIBCXX_ENABLE_WCHAR_T[(DEFAULT)]
3120 dnl Where DEFAULT is either `yes' or `no'.
3121 dnl
3122 dnl Necessary support must also be present.
3123 dnl
3124 AC_DEFUN([GLIBCXX_ENABLE_WCHAR_T], [
3125 GLIBCXX_ENABLE(wchar_t,$1,,[enable template specializations for 'wchar_t'])
3127 # Test wchar.h for mbstate_t, which is needed for char_traits and fpos.
3128 AC_CHECK_HEADERS(wchar.h, ac_has_wchar_h=yes, ac_has_wchar_h=no)
3129 AC_MSG_CHECKING([for mbstate_t])
3130 AC_TRY_COMPILE([#include <wchar.h>],
3131 [mbstate_t teststate;],
3132 have_mbstate_t=yes, have_mbstate_t=no)
3133 AC_MSG_RESULT($have_mbstate_t)
3134 if test x"$have_mbstate_t" = xyes; then
3135 AC_DEFINE(HAVE_MBSTATE_T,1,[Define if mbstate_t exists in wchar.h.])
3136 fi
3138 # Test it always, for use in GLIBCXX_ENABLE_C99, together with
3139 # ac_has_wchar_h.
3140 AC_CHECK_HEADERS(wctype.h, ac_has_wctype_h=yes, ac_has_wctype_h=no)
3142 if test x"$enable_wchar_t" = x"yes"; then
3144 AC_LANG_SAVE
3145 AC_LANG_CPLUSPLUS
3147 if test x"$ac_has_wchar_h" = xyes &&
3148 test x"$ac_has_wctype_h" = xyes; then
3149 AC_TRY_COMPILE([#include <wchar.h>
3150 #include <stddef.h>
3151 wint_t i;
3152 long l = WEOF;
3153 long j = WCHAR_MIN;
3154 long k = WCHAR_MAX;
3155 namespace test
3156 {
3157 using ::btowc;
3158 using ::fgetwc;
3159 using ::fgetws;
3160 using ::fputwc;
3161 using ::fputws;
3162 using ::fwide;
3163 using ::fwprintf;
3164 using ::fwscanf;
3165 using ::getwc;
3166 using ::getwchar;
3167 using ::mbrlen;
3168 using ::mbrtowc;
3169 using ::mbsinit;
3170 using ::mbsrtowcs;
3171 using ::putwc;
3172 using ::putwchar;
3173 using ::swprintf;
3174 using ::swscanf;
3175 using ::ungetwc;
3176 using ::vfwprintf;
3177 using ::vswprintf;
3178 using ::vwprintf;
3179 using ::wcrtomb;
3180 using ::wcscat;
3181 using ::wcschr;
3182 using ::wcscmp;
3183 using ::wcscoll;
3184 using ::wcscpy;
3185 using ::wcscspn;
3186 using ::wcsftime;
3187 using ::wcslen;
3188 using ::wcsncat;
3189 using ::wcsncmp;
3190 using ::wcsncpy;
3191 using ::wcspbrk;
3192 using ::wcsrchr;
3193 using ::wcsrtombs;
3194 using ::wcsspn;
3195 using ::wcsstr;
3196 using ::wcstod;
3197 using ::wcstok;
3198 using ::wcstol;
3199 using ::wcstoul;
3200 using ::wcsxfrm;
3201 using ::wctob;
3202 using ::wmemchr;
3203 using ::wmemcmp;
3204 using ::wmemcpy;
3205 using ::wmemmove;
3206 using ::wmemset;
3207 using ::wprintf;
3208 using ::wscanf;
3209 }
3210 ],[],[], [enable_wchar_t=no])
3211 else
3212 enable_wchar_t=no
3213 fi
3215 AC_LANG_RESTORE
3216 fi
3218 if test x"$enable_wchar_t" = x"yes"; then
3219 AC_DEFINE(_GLIBCXX_USE_WCHAR_T, 1,
3220 [Define if code specialized for wchar_t should be used.])
3221 fi
3223 AC_MSG_CHECKING([for enabled wchar_t specializations])
3224 AC_MSG_RESULT([$enable_wchar_t])
3225 ])
3228 dnl
3229 dnl Check to see if building and using a C++ precompiled header can be done.
3230 dnl
3231 dnl --enable-libstdcxx-pch=yes
3232 dnl default, this shows intent to use stdc++.h.gch If it looks like it
3233 dnl may work, after some light-hearted attempts to puzzle out compiler
3234 dnl support, flip bits on in include/Makefile.am
3235 dnl
3236 dnl --disable-libstdcxx-pch
3237 dnl turns off attempts to use or build stdc++.h.gch.
3238 dnl
3239 dnl Substs:
3240 dnl glibcxx_PCHFLAGS
3241 dnl
3242 AC_DEFUN([GLIBCXX_ENABLE_PCH], [
3243 GLIBCXX_ENABLE(libstdcxx-pch,$1,,[build pre-compiled libstdc++ headers])
3244 if test $enable_libstdcxx_pch = yes; then
3245 AC_CACHE_CHECK([for compiler with PCH support],
3246 [glibcxx_cv_prog_CXX_pch],
3247 [ac_save_CXXFLAGS="$CXXFLAGS"
3248 CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
3249 AC_LANG_SAVE
3250 AC_LANG_CPLUSPLUS
3251 echo '#include <math.h>' > conftest.h
3252 if $CXX $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
3253 -o conftest.h.gch 1>&5 2>&1 &&
3254 echo '#error "pch failed"' > conftest.h &&
3255 echo '#include "conftest.h"' > conftest.cc &&
3256 $CXX -c $CXXFLAGS $CPPFLAGS conftest.cc 1>&5 2>&1 ;
3257 then
3258 glibcxx_cv_prog_CXX_pch=yes
3259 else
3260 glibcxx_cv_prog_CXX_pch=no
3261 fi
3262 rm -f conftest*
3263 CXXFLAGS=$ac_save_CXXFLAGS
3264 AC_LANG_RESTORE
3265 ])
3266 enable_libstdcxx_pch=$glibcxx_cv_prog_CXX_pch
3267 fi
3269 AC_MSG_CHECKING([for enabled PCH])
3270 AC_MSG_RESULT([$enable_libstdcxx_pch])
3272 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_PCH, test $enable_libstdcxx_pch = yes)
3273 if test $enable_libstdcxx_pch = yes; then
3274 glibcxx_PCHFLAGS="-include bits/stdc++.h"
3275 else
3276 glibcxx_PCHFLAGS=""
3277 fi
3278 AC_SUBST(glibcxx_PCHFLAGS)
3279 ])
3282 dnl
3283 dnl Check for atomic builtins.
3284 dnl See:
3285 dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
3286 dnl
3287 dnl This checks to see if the host supports the compiler-generated
3288 dnl builtins for atomic operations for various integral sizes. Note, this
3289 dnl is intended to be an all-or-nothing switch, so all the atomic operations
3290 dnl that are used should be checked.
3291 dnl
3292 dnl Note:
3293 dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
3294 dnl
3295 AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
3296 AC_LANG_SAVE
3297 AC_LANG_CPLUSPLUS
3298 old_CXXFLAGS="$CXXFLAGS"
3300 # Do link tests if possible, instead asm tests, limited to some platforms
3301 # see discussion in PR target/40134, PR libstdc++/40133 and the thread
3302 # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
3303 atomic_builtins_link_tests=no
3304 if test x$gcc_no_link != xyes; then
3305 # Can do link tests. Limit to some tested platforms
3306 case "$host" in
3307 *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
3308 atomic_builtins_link_tests=yes
3309 ;;
3310 esac
3311 fi
3313 if test x$atomic_builtins_link_tests = xyes; then
3315 # Do link tests.
3317 CXXFLAGS="$CXXFLAGS -fno-exceptions"
3319 AC_MSG_CHECKING([for atomic builtins for bool])
3320 AC_CACHE_VAL(glibcxx_cv_atomic_bool, [
3321 AC_TRY_LINK(
3322 [ ],
3323 [typedef bool atomic_type;
3324 atomic_type c1;
3325 atomic_type c2;
3326 atomic_type c3(0);
3327 // N.B. __atomic_fetch_add is not supported for bool.
3328 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3329 __ATOMIC_RELAXED);
3330 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3331 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3332 ],
3333 [glibcxx_cv_atomic_bool=yes],
3334 [glibcxx_cv_atomic_bool=no])
3335 ])
3336 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3338 AC_MSG_CHECKING([for atomic builtins for short])
3339 AC_CACHE_VAL(glibcxx_cv_atomic_short, [
3340 AC_TRY_LINK(
3341 [ ],
3342 [typedef short atomic_type;
3343 atomic_type c1;
3344 atomic_type c2;
3345 atomic_type c3(0);
3346 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3347 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3348 __ATOMIC_RELAXED);
3349 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3350 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3351 ],
3352 [glibcxx_cv_atomic_short=yes],
3353 [glibcxx_cv_atomic_short=no])
3354 ])
3355 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3357 AC_MSG_CHECKING([for atomic builtins for int])
3358 AC_CACHE_VAL(glibcxx_cv_atomic_int, [
3359 AC_TRY_LINK(
3360 [ ],
3361 [typedef int 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_int=yes],
3372 [glibcxx_cv_atomic_int=no])
3373 ])
3374 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3376 AC_MSG_CHECKING([for atomic builtins for long long])
3377 AC_CACHE_VAL(glibcxx_cv_atomic_long_long, [
3378 AC_TRY_LINK(
3379 [ ],
3380 [typedef long long atomic_type;
3381 atomic_type c1;
3382 atomic_type c2;
3383 atomic_type c3(0);
3384 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3385 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3386 __ATOMIC_RELAXED);
3387 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3388 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3389 ],
3390 [glibcxx_cv_atomic_long_long=yes],
3391 [glibcxx_cv_atomic_long_long=no])
3392 ])
3393 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3395 else
3397 # Do asm tests.
3399 # Compile unoptimized.
3400 CXXFLAGS='-O0 -S'
3402 # Fake what AC_TRY_COMPILE does.
3404 cat > conftest.$ac_ext << EOF
3405 [#]line __oline__ "configure"
3406 int main()
3407 {
3408 typedef bool atomic_type;
3409 atomic_type c1;
3410 atomic_type c2;
3411 atomic_type c3(0);
3412 // N.B. __atomic_fetch_add is not supported for bool.
3413 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3414 __ATOMIC_RELAXED);
3415 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3416 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3418 return 0;
3419 }
3420 EOF
3422 AC_MSG_CHECKING([for atomic builtins for bool])
3423 if AC_TRY_EVAL(ac_compile); then
3424 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3425 glibcxx_cv_atomic_bool=no
3426 else
3427 glibcxx_cv_atomic_bool=yes
3428 fi
3429 fi
3430 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3431 rm -f conftest*
3433 cat > conftest.$ac_ext << EOF
3434 [#]line __oline__ "configure"
3435 int main()
3436 {
3437 typedef short atomic_type;
3438 atomic_type c1;
3439 atomic_type c2;
3440 atomic_type c3(0);
3441 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3442 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3443 __ATOMIC_RELAXED);
3444 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3445 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3447 return 0;
3448 }
3449 EOF
3451 AC_MSG_CHECKING([for atomic builtins for short])
3452 if AC_TRY_EVAL(ac_compile); then
3453 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3454 glibcxx_cv_atomic_short=no
3455 else
3456 glibcxx_cv_atomic_short=yes
3457 fi
3458 fi
3459 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3460 rm -f conftest*
3462 cat > conftest.$ac_ext << EOF
3463 [#]line __oline__ "configure"
3464 int main()
3465 {
3466 // NB: _Atomic_word not necessarily int.
3467 typedef int atomic_type;
3468 atomic_type c1;
3469 atomic_type c2;
3470 atomic_type c3(0);
3471 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3472 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3473 __ATOMIC_RELAXED);
3474 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3475 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3477 return 0;
3478 }
3479 EOF
3481 AC_MSG_CHECKING([for atomic builtins for int])
3482 if AC_TRY_EVAL(ac_compile); then
3483 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3484 glibcxx_cv_atomic_int=no
3485 else
3486 glibcxx_cv_atomic_int=yes
3487 fi
3488 fi
3489 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3490 rm -f conftest*
3492 cat > conftest.$ac_ext << EOF
3493 [#]line __oline__ "configure"
3494 int main()
3495 {
3496 typedef long long atomic_type;
3497 atomic_type c1;
3498 atomic_type c2;
3499 atomic_type c3(0);
3500 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3501 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3502 __ATOMIC_RELAXED);
3503 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3504 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3506 return 0;
3507 }
3508 EOF
3510 AC_MSG_CHECKING([for atomic builtins for long long])
3511 if AC_TRY_EVAL(ac_compile); then
3512 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3513 glibcxx_cv_atomic_long_long=no
3514 else
3515 glibcxx_cv_atomic_long_long=yes
3516 fi
3517 fi
3518 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3519 rm -f conftest*
3521 fi
3523 CXXFLAGS="$old_CXXFLAGS"
3524 AC_LANG_RESTORE
3526 # Set atomicity_dir to builtins if all but the long long test above passes,
3527 # or if the builtins were already chosen (e.g. by configure.host).
3528 if { test "$glibcxx_cv_atomic_bool" = yes \
3529 && test "$glibcxx_cv_atomic_short" = yes \
3530 && test "$glibcxx_cv_atomic_int" = yes; } \
3531 || test "$atomicity_dir" = "cpu/generic/atomicity_builtins"; then
3532 AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS, 1,
3533 [Define if the compiler supports C++11 atomics.])
3534 atomicity_dir=cpu/generic/atomicity_builtins
3535 fi
3537 # If still generic, set to mutex.
3538 if test $atomicity_dir = "cpu/generic" ; then
3539 atomicity_dir=cpu/generic/atomicity_mutex
3540 AC_MSG_WARN([No native atomic operations are provided for this platform.])
3541 if test "x$target_thread_file" = xsingle; then
3542 AC_MSG_WARN([They cannot be faked when thread support is disabled.])
3543 AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
3544 else
3545 AC_MSG_WARN([They will be faked using a mutex.])
3546 AC_MSG_WARN([Performance of certain classes will degrade as a result.])
3547 fi
3548 fi
3550 ])
3552 dnl
3553 dnl Set default lock policy for synchronizing shared_ptr reference counting.
3554 dnl
3555 dnl --with-libstdcxx-lock-policy=auto
3556 dnl Use atomic operations for shared_ptr reference counting only if
3557 dnl the default target supports atomic compare-and-swap.
3558 dnl --with-libstdcxx-lock-policy=atomic
3559 dnl Use atomic operations for shared_ptr reference counting.
3560 dnl --with-libstdcxx-lock-policy=mutex
3561 dnl Use a mutex to synchronize shared_ptr reference counting.
3562 dnl
3563 dnl This controls the value of __gnu_cxx::__default_lock_policy, which
3564 dnl determines how shared_ptr reference counts are synchronized.
3565 dnl The option "atomic" means that atomic operations should be used,
3566 dnl "mutex" means that a mutex will be used. The default option, "auto",
3567 dnl will check if the target supports the compiler-generated builtins
3568 dnl for atomic compare-and-swap operations for 2-byte and 4-byte integers,
3569 dnl and will use "atomic" if supported, "mutex" otherwise.
3570 dnl This option is ignored if the thread model used by GCC is "single",
3571 dnl as no synchronization is used at all in that case.
3572 dnl This option affects the library ABI (except in the "single" thread model).
3573 dnl
3574 dnl Defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY to 1 if atomics should be used.
3575 dnl
3576 AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [
3578 AC_ARG_WITH([libstdcxx-lock-policy],
3579 AC_HELP_STRING([--with-libstdcxx-lock-policy={atomic,mutex,auto}],
3580 [synchronization policy for shared_ptr reference counting [default=auto]]),
3581 [libstdcxx_atomic_lock_policy=$withval],
3582 [libstdcxx_atomic_lock_policy=auto])
3584 case "$libstdcxx_atomic_lock_policy" in
3585 atomic|mutex|auto) ;;
3586 *) AC_MSG_ERROR([Invalid argument for --with-libstdcxx-lock-policy]) ;;
3587 esac
3588 AC_MSG_CHECKING([for lock policy for shared_ptr reference counts])
3590 if test x"$libstdcxx_atomic_lock_policy" = x"auto"; then
3591 AC_LANG_SAVE
3592 AC_LANG_CPLUSPLUS
3593 ac_save_CXXFLAGS="$CXXFLAGS"
3595 dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?!
3596 AC_TRY_COMPILE([
3597 #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
3598 # error "No 2-byte compare-and-swap"
3599 #elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
3600 # error "No 4-byte compare-and-swap"
3601 #endif
3602 ],,
3603 [libstdcxx_atomic_lock_policy=atomic],
3604 [libstdcxx_atomic_lock_policy=mutex])
3605 AC_LANG_RESTORE
3606 CXXFLAGS="$ac_save_CXXFLAGS"
3607 fi
3609 if test x"$libstdcxx_atomic_lock_policy" = x"atomic"; then
3610 AC_MSG_RESULT(atomic)
3611 AC_DEFINE(HAVE_ATOMIC_LOCK_POLICY,1,
3612 [Defined if shared_ptr reference counting should use atomic operations.])
3613 else
3614 AC_MSG_RESULT(mutex)
3615 fi
3617 ])
3619 dnl
3620 dnl Allow visibility attributes to be used on namespaces, objects, etc.
3621 dnl
3622 dnl --enable-libstdcxx-visibility enables attempt to use visibility attributes.
3623 dnl --disable-libstdcxx-visibility turns off all use of visibility attributes.
3624 dnl + Usage: GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY[(DEFAULT)]
3625 dnl Where DEFAULT is 'yes'.
3626 dnl
3627 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY], [
3628 GLIBCXX_ENABLE(libstdcxx-visibility,$1,,[enables visibility safe usage])
3630 if test x$enable_libstdcxx_visibility = xyes ; then
3631 dnl all hail libgfortran
3632 dnl Check whether the target supports hidden visibility.
3633 AC_CACHE_CHECK([whether the target supports hidden visibility],
3634 glibcxx_cv_have_attribute_visibility, [
3635 save_CFLAGS="$CFLAGS"
3636 CFLAGS="$CFLAGS -Werror"
3637 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
3638 [], glibcxx_cv_have_attribute_visibility=yes,
3639 glibcxx_cv_have_attribute_visibility=no)
3640 CFLAGS="$save_CFLAGS"])
3641 if test $glibcxx_cv_have_attribute_visibility = no; then
3642 enable_libstdcxx_visibility=no
3643 fi
3644 fi
3646 GLIBCXX_CONDITIONAL(ENABLE_VISIBILITY, test $enable_libstdcxx_visibility = yes)
3647 AC_MSG_NOTICE([visibility supported: $enable_libstdcxx_visibility])
3648 ])
3651 dnl
3652 dnl Add version tags to symbols in shared library (or not), additionally
3653 dnl marking other symbols as private/local (or not).
3654 dnl
3655 dnl Sets libtool_VERSION, and determines shared library SONAME.
3656 dnl
3657 dnl This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
3658 dnl
3659 dnl --enable-symvers=style adds a version script to the linker call when
3660 dnl creating the shared library. The choice of version script is
3661 dnl controlled by 'style'.
3662 dnl --disable-symvers does not.
3663 dnl
3664 dnl + Usage: GLIBCXX_ENABLE_SYMVERS[(DEFAULT)]
3665 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
3666 dnl choose a default style based on linker characteristics. Passing
3667 dnl 'no' disables versioning.
3668 dnl
3669 AC_DEFUN([GLIBCXX_ENABLE_SYMVERS], [
3671 GLIBCXX_ENABLE(symvers,$1,[[[=STYLE]]],
3672 [enables symbol versioning of the shared library],
3673 [permit yes|no|gnu|gnu-versioned-namespace|darwin|darwin-export|sun])
3675 # If we never went through the GLIBCXX_CHECK_LINKER_FEATURES macro, then we
3676 # don't know enough about $LD to do tricks...
3677 AC_REQUIRE([GLIBCXX_CHECK_LINKER_FEATURES])
3678 # Sun style symbol versions needs GNU c++filt for make_sunver.pl to work
3679 # with extern "C++" in version scripts.
3680 AC_REQUIRE([GCC_PROG_GNU_CXXFILT])
3682 # Turn a 'yes' into a suitable default.
3683 if test x$enable_symvers = xyes ; then
3684 if test $enable_shared = no || test "x$LD" = x || test x$gcc_no_link = xyes; then
3685 enable_symvers=no
3686 else
3687 if test $with_gnu_ld = yes ; then
3688 case ${target_os} in
3689 hpux*)
3690 enable_symvers=no ;;
3691 *)
3692 enable_symvers=gnu ;;
3693 esac
3694 else
3695 case ${target_os} in
3696 darwin*)
3697 enable_symvers=darwin ;;
3698 # Sun symbol versioning exists since Solaris 2.5.
3699 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
3700 # make_sunver.pl needs GNU c++filt to support extern "C++" in
3701 # version scripts, so disable symbol versioning if none can be
3702 # found.
3703 if test -z "$ac_cv_path_CXXFILT"; then
3704 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3705 AC_MSG_WARN([=== no GNU c++filt could be found.])
3706 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3707 enable_symvers=no
3708 else
3709 enable_symvers=sun
3710 fi
3711 ;;
3712 *)
3713 enable_symvers=no ;;
3714 esac
3715 fi
3716 fi
3717 fi
3719 # Check to see if 'darwin' or 'darwin-export' can win.
3720 if test x$enable_symvers = xdarwin-export ; then
3721 enable_symvers=darwin
3722 fi
3724 # Check if 'sun' was requested on non-Solaris 2 platforms.
3725 if test x$enable_symvers = xsun ; then
3726 case ${target_os} in
3727 solaris2*)
3728 # All fine.
3729 ;;
3730 *)
3731 # Unlikely to work.
3732 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3733 AC_MSG_WARN([=== you are not targetting Solaris 2.])
3734 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3735 enable_symvers=no
3736 ;;
3737 esac
3738 fi
3740 # Check to see if 'gnu' can win.
3741 if test $enable_symvers = gnu ||
3742 test $enable_symvers = gnu-versioned-namespace ||
3743 test $enable_symvers = sun; then
3744 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
3745 AC_MSG_CHECKING([for shared libgcc])
3746 ac_save_CFLAGS="$CFLAGS"
3747 CFLAGS=' -lgcc_s'
3748 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes, glibcxx_shared_libgcc=no)
3749 CFLAGS="$ac_save_CFLAGS"
3750 if test $glibcxx_shared_libgcc = no; then
3751 cat > conftest.c <<EOF
3752 int main (void) { return 0; }
3753 EOF
3754 changequote(,)dnl
3755 glibcxx_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
3756 -shared -shared-libgcc -o conftest.so \
3757 conftest.c -v 2>&1 >/dev/null \
3758 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
3759 changequote([,])dnl
3760 rm -f conftest.c conftest.so
3761 if test x${glibcxx_libgcc_s_suffix+set} = xset; then
3762 CFLAGS=" -lgcc_s$glibcxx_libgcc_s_suffix"
3763 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes)
3764 CFLAGS="$ac_save_CFLAGS"
3765 fi
3766 fi
3767 AC_MSG_RESULT($glibcxx_shared_libgcc)
3769 # For GNU ld, we need at least this version. The format is described in
3770 # GLIBCXX_CHECK_LINKER_FEATURES above.
3771 glibcxx_min_gnu_ld_version=21400
3773 # If no shared libgcc, can't win.
3774 if test $glibcxx_shared_libgcc != yes; then
3775 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3776 AC_MSG_WARN([=== you are not building a shared libgcc_s.])
3777 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3778 enable_symvers=no
3779 elif test $with_gnu_ld != yes && test $enable_symvers = sun; then
3780 : All interesting versions of Sun ld support sun style symbol versioning.
3781 elif test $with_gnu_ld != yes ; then
3782 # just fail for now
3783 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3784 AC_MSG_WARN([=== you are not using the GNU linker.])
3785 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3786 enable_symvers=no
3787 elif test $glibcxx_ld_is_gold = yes ; then
3788 : All versions of gold support symbol versioning.
3789 elif test $glibcxx_gnu_ld_version -lt $glibcxx_min_gnu_ld_version ; then
3790 # The right tools, the right setup, but too old. Fallbacks?
3791 AC_MSG_WARN(=== Linker version $glibcxx_gnu_ld_version is too old for)
3792 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
3793 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
3794 AC_MSG_WARN(=== $glibcxx_min_gnu_ld_version or later and rebuild GCC.)
3795 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3796 enable_symvers=no
3797 fi
3798 fi
3800 # For libtool versioning info, format is CURRENT:REVISION:AGE
3801 libtool_VERSION=6:29:0
3803 # Everything parsed; figure out what files and settings to use.
3804 case $enable_symvers in
3805 no)
3806 SYMVER_FILE=config/abi/pre/none.ver
3807 ;;
3808 gnu)
3809 SYMVER_FILE=config/abi/pre/gnu.ver
3810 AC_DEFINE(_GLIBCXX_SYMVER_GNU, 1,
3811 [Define to use GNU versioning in the shared library.])
3812 ;;
3813 gnu-versioned-namespace)
3814 libtool_VERSION=8:0:0
3815 SYMVER_FILE=config/abi/pre/gnu-versioned-namespace.ver
3816 AC_DEFINE(_GLIBCXX_SYMVER_GNU_NAMESPACE, 1,
3817 [Define to use GNU namespace versioning in the shared library.])
3818 ;;
3819 darwin)
3820 SYMVER_FILE=config/abi/pre/gnu.ver
3821 AC_DEFINE(_GLIBCXX_SYMVER_DARWIN, 1,
3822 [Define to use darwin versioning in the shared library.])
3823 ;;
3824 sun)
3825 SYMVER_FILE=config/abi/pre/gnu.ver
3826 AC_DEFINE(_GLIBCXX_SYMVER_SUN, 1,
3827 [Define to use Sun versioning in the shared library.])
3828 ;;
3829 esac
3831 if test x$enable_symvers != xno ; then
3832 AC_DEFINE(_GLIBCXX_SYMVER, 1,
3833 [Define to use symbol versioning in the shared library.])
3834 fi
3836 AC_CACHE_CHECK([whether the target supports .symver directive],
3837 glibcxx_cv_have_as_symver_directive, [
3838 AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
3839 [], glibcxx_cv_have_as_symver_directive=yes,
3840 glibcxx_cv_have_as_symver_directive=no)])
3841 if test $glibcxx_cv_have_as_symver_directive = yes; then
3842 AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
3843 [Define to 1 if the target assembler supports .symver directive.])
3844 fi
3846 AC_SUBST(SYMVER_FILE)
3847 AC_SUBST(port_specific_symbol_files)
3848 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS, test $enable_symvers != no)
3849 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU, test $enable_symvers = gnu)
3850 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU_NAMESPACE, test $enable_symvers = gnu-versioned-namespace)
3851 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_DARWIN, test $enable_symvers = darwin)
3852 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_SUN, test $enable_symvers = sun)
3853 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
3855 if test $enable_symvers != no ; then
3856 case ${target_os} in
3857 # The Solaris 2 runtime linker doesn't support the GNU extension of
3858 # binding the same symbol to different versions
3859 solaris2*)
3860 ;;
3861 # Other platforms with GNU symbol versioning (GNU/Linux, more?) do.
3862 *)
3863 AC_DEFINE(HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT, 1,
3864 [Define to 1 if the target runtime linker supports binding the same symbol to different versions.])
3865 ;;
3866 esac
3867 fi
3869 # Now, set up compatibility support, if any.
3870 # In addition, need this to deal with std::size_t mangling in
3871 # src/compatibility.cc. In a perfect world, could use
3872 # typeid(std::size_t).name()[0] to do direct substitution.
3873 AC_MSG_CHECKING([for size_t as unsigned int])
3874 ac_save_CFLAGS="$CFLAGS"
3875 CFLAGS="-Werror"
3876 AC_TRY_COMPILE(, [__SIZE_TYPE__* stp; unsigned int* uip; stp = uip;],
3877 [glibcxx_size_t_is_i=yes], [glibcxx_size_t_is_i=no])
3878 CFLAGS=$ac_save_CFLAGS
3879 if test "$glibcxx_size_t_is_i" = yes; then
3880 AC_DEFINE(_GLIBCXX_SIZE_T_IS_UINT, 1, [Define if size_t is unsigned int.])
3881 fi
3882 AC_MSG_RESULT([$glibcxx_size_t_is_i])
3884 AC_MSG_CHECKING([for ptrdiff_t as int])
3885 ac_save_CFLAGS="$CFLAGS"
3886 CFLAGS="-Werror"
3887 AC_TRY_COMPILE(, [__PTRDIFF_TYPE__* ptp; int* ip; ptp = ip;],
3888 [glibcxx_ptrdiff_t_is_i=yes], [glibcxx_ptrdiff_t_is_i=no])
3889 CFLAGS=$ac_save_CFLAGS
3890 if test "$glibcxx_ptrdiff_t_is_i" = yes; then
3891 AC_DEFINE(_GLIBCXX_PTRDIFF_T_IS_INT, 1, [Define if ptrdiff_t is int.])
3892 fi
3893 AC_MSG_RESULT([$glibcxx_ptrdiff_t_is_i])
3894 ])
3897 dnl
3898 dnl Setup to use the gcc gthr.h thread-specific memory and mutex model.
3899 dnl We must stage the required headers so that they will be installed
3900 dnl with the library (unlike libgcc, the STL implementation is provided
3901 dnl solely within headers). Since we must not inject random user-space
3902 dnl macro names into user-provided C++ code, we first stage into <file>-in
3903 dnl and process to <file> with an output command. The reason for a two-
3904 dnl stage process here is to correctly handle $srcdir!=$objdir without
3905 dnl having to write complex code (the sed commands to clean the macro
3906 dnl namespace are complex and fragile enough as it is). We must also
3907 dnl add a relative path so that -I- is supported properly.
3908 dnl
3909 dnl Substs:
3910 dnl thread_header
3911 dnl
3912 AC_DEFUN([GLIBCXX_ENABLE_THREADS], [
3913 AC_MSG_CHECKING([for thread model used by GCC])
3914 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3915 AC_MSG_RESULT([$target_thread_file])
3916 GCC_AC_THREAD_HEADER([$target_thread_file])
3917 ])
3920 dnl
3921 dnl Check if gthread implementation defines the types and functions
3922 dnl required by the c++0x thread library. Conforming gthread
3923 dnl implementations can define __GTHREADS_CXX0X to enable use with c++0x.
3924 dnl
3925 dnl GLIBCXX_ENABLE_SYMVERS must be done before this.
3926 dnl
3927 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
3928 GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
3930 if test x$enable_libstdcxx_threads = xauto ||
3931 test x$enable_libstdcxx_threads = xyes; then
3933 AC_LANG_SAVE
3934 AC_LANG_CPLUSPLUS
3936 ac_save_CXXFLAGS="$CXXFLAGS"
3937 CXXFLAGS="$CXXFLAGS -fno-exceptions \
3938 -I${toplevel_srcdir}/libgcc -I${toplevel_builddir}/libgcc"
3940 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3941 case $target_thread_file in
3942 posix)
3943 CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
3944 esac
3946 AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
3948 AC_TRY_COMPILE([#include <unistd.h>],
3949 [
3950 // In case of POSIX threads check _POSIX_TIMEOUTS.
3951 #if (defined(_PTHREADS) \
3952 && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
3953 #error
3954 #endif
3955 ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
3957 AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
3958 [Define to 1 if mutex_timedlock is available.])
3960 if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
3961 else res_mutex_timedlock=no ; fi
3962 AC_MSG_RESULT([$res_mutex_timedlock])
3964 AC_MSG_CHECKING([for gthreads library])
3966 AC_TRY_COMPILE([#include "gthr.h"],
3967 [
3968 #ifndef __GTHREADS_CXX0X
3969 #error
3970 #endif
3971 ], [ac_has_gthreads=yes], [ac_has_gthreads=no])
3972 else
3973 ac_has_gthreads=no
3974 fi
3976 AC_MSG_RESULT([$ac_has_gthreads])
3978 if test x"$ac_has_gthreads" = x"yes"; then
3979 AC_DEFINE(_GLIBCXX_HAS_GTHREADS, 1,
3980 [Define if gthreads library is available.])
3982 # Also check for pthread_rwlock_t for std::shared_timed_mutex in C++14
3983 # but only do so if we're using pthread in the gthread library.
3984 # On VxWorks for example, pthread_rwlock_t is defined in sys/types.h
3985 # but the pthread library is not there by default and the gthread library
3986 # does not use it.
3987 AC_TRY_COMPILE([#include "gthr.h"],
3988 [
3989 #if (!defined(_PTHREADS))
3990 #error
3991 #endif
3992 ], [ac_gthread_use_pthreads=yes], [ac_gthread_use_pthreads=no])
3993 if test x"$ac_gthread_use_pthreads" = x"yes"; then
3994 AC_CHECK_TYPE([pthread_rwlock_t],
3995 [AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
3996 [Define if POSIX read/write locks are available in <gthr.h>.])],
3997 [],
3998 [#include "gthr.h"])
3999 fi
4000 fi
4002 AC_CHECK_HEADER(semaphore.h, [
4003 AC_MSG_CHECKING([for POSIX Semaphores and sem_timedwait])
4004 AC_TRY_COMPILE([
4005 #include <unistd.h>
4006 #include <semaphore.h>
4007 #include <limits.h>
4008 ],
4009 [
4010 #if !defined _POSIX_TIMEOUTS || _POSIX_TIMEOUTS <= 0
4011 # error "POSIX Timeouts option not supported"
4012 #elif !defined _POSIX_SEMAPHORES || _POSIX_SEMAPHORES <= 0
4013 # error "POSIX Semaphores option not supported"
4014 #else
4015 #if defined SEM_VALUE_MAX
4016 constexpr int sem_value_max = SEM_VALUE_MAX;
4017 #elif defined _POSIX_SEM_VALUE_MAX
4018 constexpr int sem_value_max = _POSIX_SEM_VALUE_MAX;
4019 #else
4020 # error "SEM_VALUE_MAX not available"
4021 #endif
4022 sem_t sem;
4023 sem_init(&sem, 0, sem_value_max);
4024 struct timespec ts = { 0 };
4025 sem_timedwait(&sem, &ts);
4026 #endif
4027 ],
4028 [ac_have_posix_semaphore=yes],
4029 [ac_have_posix_semaphore=no])],
4030 [ac_have_posix_semaphore=no])
4032 if test $ac_have_posix_semaphore = yes ; then
4033 AC_DEFINE(HAVE_POSIX_SEMAPHORE,
4034 1,
4035 [Define to 1 if POSIX Semaphores with sem_timedwait are available in <semaphore.h>.])
4036 fi
4037 AC_MSG_RESULT([$ac_have_posix_semaphore])
4039 CXXFLAGS="$ac_save_CXXFLAGS"
4040 AC_LANG_RESTORE
4041 ])
4044 # Check whether LC_MESSAGES is available in <locale.h>.
4045 # Ulrich Drepper <drepper@cygnus.com>, 1995.
4046 #
4047 # This file file be copied and used freely without restrictions. It can
4048 # be used in projects which are not available under the GNU Public License
4049 # but which still want to provide support for the GNU gettext functionality.
4050 # Please note that the actual code is *not* freely available.
4051 AC_DEFUN([AC_LC_MESSAGES], [
4052 AC_CHECK_HEADER(locale.h, [
4053 AC_CACHE_CHECK([for LC_MESSAGES], ac_cv_val_LC_MESSAGES,
4054 [AC_TRY_COMPILE([#include <locale.h>], [return LC_MESSAGES],
4055 ac_cv_val_LC_MESSAGES=yes, ac_cv_val_LC_MESSAGES=no)])
4056 if test $ac_cv_val_LC_MESSAGES = yes; then
4057 AC_DEFINE(HAVE_LC_MESSAGES, 1,
4058 [Define if LC_MESSAGES is available in <locale.h>.])
4059 fi
4060 ])
4061 ])
4063 dnl
4064 dnl Check whether rdrand is supported in the assembler.
4065 AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [
4066 AC_MSG_CHECKING([for rdrand support in assembler])
4067 AC_CACHE_VAL(ac_cv_x86_rdrand, [
4068 ac_cv_x86_rdrand=no
4069 case "$target" in
4070 i?86-*-* | \
4071 x86_64-*-*)
4072 AC_TRY_COMPILE(, [asm("rdrand %eax");],
4073 [ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no])
4074 esac
4075 ])
4076 if test $ac_cv_x86_rdrand = yes; then
4077 AC_DEFINE(_GLIBCXX_X86_RDRAND, 1,
4078 [ Defined if as can handle rdrand. ])
4079 fi
4080 AC_MSG_RESULT($ac_cv_x86_rdrand)
4081 ])
4083 dnl
4084 dnl Check whether rdseed is supported in the assembler.
4085 AC_DEFUN([GLIBCXX_CHECK_X86_RDSEED], [
4086 AC_MSG_CHECKING([for rdseed support in assembler])
4087 AC_CACHE_VAL(ac_cv_x86_rdseed, [
4088 ac_cv_x86_rdseed=no
4089 case "$target" in
4090 i?86-*-* | \
4091 x86_64-*-*)
4092 AC_TRY_COMPILE(, [asm("rdseed %eax");],
4093 [ac_cv_x86_rdseed=yes], [ac_cv_x86_rdseed=no])
4094 esac
4095 ])
4096 if test $ac_cv_x86_rdseed = yes; then
4097 AC_DEFINE(_GLIBCXX_X86_RDSEED, 1,
4098 [ Defined if as can handle rdseed. ])
4099 fi
4100 AC_MSG_RESULT($ac_cv_x86_rdseed)
4101 ])
4103 dnl
4104 dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS.
4105 dnl
4106 AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [
4108 AC_LANG_SAVE
4109 AC_LANG_CPLUSPLUS
4110 ac_save_CXXFLAGS="$CXXFLAGS"
4111 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4113 AC_MSG_CHECKING([for get_nprocs])
4114 AC_CACHE_VAL(glibcxx_cv_GET_NPROCS, [
4115 GCC_TRY_COMPILE_OR_LINK(
4116 [#include <sys/sysinfo.h>],
4117 [int n = get_nprocs();],
4118 [glibcxx_cv_GET_NPROCS=yes],
4119 [glibcxx_cv_GET_NPROCS=no])
4120 ])
4121 if test $glibcxx_cv_GET_NPROCS = yes; then
4122 AC_DEFINE(_GLIBCXX_USE_GET_NPROCS, 1, [Define if get_nprocs is available in <sys/sysinfo.h>.])
4123 fi
4124 AC_MSG_RESULT($glibcxx_cv_GET_NPROCS)
4126 CXXFLAGS="$ac_save_CXXFLAGS"
4127 AC_LANG_RESTORE
4128 ])
4130 dnl
4131 dnl Check whether sysconf(_SC_NPROCESSORS_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROCESSORS_ONLN.
4132 dnl
4133 AC_DEFUN([GLIBCXX_CHECK_SC_NPROCESSORS_ONLN], [
4135 AC_LANG_SAVE
4136 AC_LANG_CPLUSPLUS
4137 ac_save_CXXFLAGS="$CXXFLAGS"
4138 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4140 AC_MSG_CHECKING([for _SC_NPROCESSORS_ONLN])
4141 AC_CACHE_VAL(glibcxx_cv_SC_NPROCESSORS_ONLN, [
4142 GCC_TRY_COMPILE_OR_LINK(
4143 [#include <unistd.h>],
4144 [int n = sysconf(_SC_NPROCESSORS_ONLN);],
4145 [glibcxx_cv_SC_NPROCESSORS_ONLN=yes],
4146 [glibcxx_cv_SC_NPROCESSORS_ONLN=no])
4147 ])
4148 if test $glibcxx_cv_SC_NPROCESSORS_ONLN = yes; then
4149 AC_DEFINE(_GLIBCXX_USE_SC_NPROCESSORS_ONLN, 1, [Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>.])
4150 fi
4151 AC_MSG_RESULT($glibcxx_cv_SC_NPROCESSORS_ONLN)
4153 CXXFLAGS="$ac_save_CXXFLAGS"
4154 AC_LANG_RESTORE
4155 ])
4157 dnl
4158 dnl Check whether sysconf(_SC_NPROC_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROC_ONLN.
4159 dnl
4160 AC_DEFUN([GLIBCXX_CHECK_SC_NPROC_ONLN], [
4162 AC_LANG_SAVE
4163 AC_LANG_CPLUSPLUS
4164 ac_save_CXXFLAGS="$CXXFLAGS"
4165 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4167 AC_MSG_CHECKING([for _SC_NPROC_ONLN])
4168 AC_CACHE_VAL(glibcxx_cv_SC_NPROC_ONLN, [
4169 GCC_TRY_COMPILE_OR_LINK(
4170 [#include <unistd.h>],
4171 [int n = sysconf(_SC_NPROC_ONLN);],
4172 [glibcxx_cv_SC_NPROC_ONLN=yes],
4173 [glibcxx_cv_SC_NPROC_ONLN=no])
4174 ])
4175 if test $glibcxx_cv_SC_NPROC_ONLN = yes; then
4176 AC_DEFINE(_GLIBCXX_USE_SC_NPROC_ONLN, 1, [Define if _SC_NPROC_ONLN is available in <unistd.h>.])
4177 fi
4178 AC_MSG_RESULT($glibcxx_cv_SC_NPROC_ONLN)
4180 CXXFLAGS="$ac_save_CXXFLAGS"
4181 AC_LANG_RESTORE
4182 ])
4184 dnl
4185 dnl Check whether pthread_num_processors_np is available in <pthread.h>, and define _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP.
4186 dnl
4187 AC_DEFUN([GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP], [
4189 AC_LANG_SAVE
4190 AC_LANG_CPLUSPLUS
4191 ac_save_CXXFLAGS="$CXXFLAGS"
4192 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4194 AC_MSG_CHECKING([for pthreads_num_processors_np])
4195 AC_CACHE_VAL(glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP, [
4196 GCC_TRY_COMPILE_OR_LINK(
4197 [#include <pthread.h>],
4198 [int n = pthread_num_processors_np();],
4199 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=yes],
4200 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=no])
4201 ])
4202 if test $glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP = yes; then
4203 AC_DEFINE(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP, 1, [Define if pthreads_num_processors_np is available in <pthread.h>.])
4204 fi
4205 AC_MSG_RESULT($glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP)
4207 CXXFLAGS="$ac_save_CXXFLAGS"
4208 AC_LANG_RESTORE
4209 ])
4211 dnl
4212 dnl Check whether pthread_cond_clockwait is available in <pthread.h> for std::condition_variable to use,
4213 dnl and define _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT.
4214 dnl
4215 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT], [
4217 AC_LANG_SAVE
4218 AC_LANG_CPLUSPLUS
4219 ac_save_CXXFLAGS="$CXXFLAGS"
4220 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4221 ac_save_LIBS="$LIBS"
4222 LIBS="$LIBS -lpthread"
4224 AC_MSG_CHECKING([for pthread_cond_clockwait])
4225 AC_CACHE_VAL(glibcxx_cv_PTHREAD_COND_CLOCKWAIT, [
4226 GCC_TRY_COMPILE_OR_LINK(
4227 [#include <pthread.h>],
4228 [pthread_mutex_t mutex; pthread_cond_t cond; struct timespec ts; int n = pthread_cond_clockwait(&cond, &mutex, 0, &ts);],
4229 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=yes],
4230 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=no])
4231 ])
4232 if test $glibcxx_cv_PTHREAD_COND_CLOCKWAIT = yes; then
4233 AC_DEFINE(_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT, 1, [Define if pthread_cond_clockwait is available in <pthread.h>.])
4234 fi
4235 AC_MSG_RESULT($glibcxx_cv_PTHREAD_COND_CLOCKWAIT)
4237 CXXFLAGS="$ac_save_CXXFLAGS"
4238 LIBS="$ac_save_LIBS"
4239 AC_LANG_RESTORE
4240 ])
4242 dnl
4243 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4244 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4245 dnl
4246 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK], [
4248 AC_LANG_SAVE
4249 AC_LANG_CPLUSPLUS
4250 ac_save_CXXFLAGS="$CXXFLAGS"
4251 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4252 ac_save_LIBS="$LIBS"
4253 LIBS="$LIBS -lpthread"
4255 AC_MSG_CHECKING([for pthread_mutex_clocklock])
4256 AC_CACHE_VAL(glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK, [
4257 GCC_TRY_COMPILE_OR_LINK(
4258 [#include <pthread.h>],
4259 [pthread_mutex_t mutex; struct timespec ts; int n = pthread_mutex_clocklock(&mutex, CLOCK_REALTIME, &ts);],
4260 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=yes],
4261 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=no])
4262 ])
4263 if test $glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK = yes; then
4264 AC_DEFINE(_GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK, 1, [Define if pthread_mutex_clocklock is available in <pthread.h>.])
4265 fi
4266 AC_MSG_RESULT($glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK)
4268 CXXFLAGS="$ac_save_CXXFLAGS"
4269 LIBS="$ac_save_LIBS"
4270 AC_LANG_RESTORE
4271 ])
4273 dnl
4274 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4275 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4276 dnl
4277 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK], [
4279 AC_LANG_SAVE
4280 AC_LANG_CPLUSPLUS
4281 ac_save_CXXFLAGS="$CXXFLAGS"
4282 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4283 ac_save_LIBS="$LIBS"
4284 LIBS="$LIBS -lpthread"
4286 AC_MSG_CHECKING([for pthread_rwlock_clockrdlock, pthread_wlock_clockwrlock])
4287 AC_CACHE_VAL(glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK, [
4288 GCC_TRY_COMPILE_OR_LINK(
4289 [#include <pthread.h>],
4290 [pthread_rwlock_t rwl; struct timespec ts;]
4291 [int n = pthread_rwlock_clockrdlock(&rwl, CLOCK_REALTIME, &ts);]
4292 [int m = pthread_rwlock_clockwrlock(&rwl, CLOCK_REALTIME, &ts);],
4293 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=yes],
4294 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=no])
4295 ])
4296 if test $glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK = yes; then
4297 AC_DEFINE(_GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK, 1, [Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are available in <pthread.h>.])
4298 fi
4299 AC_MSG_RESULT($glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK)
4301 CXXFLAGS="$ac_save_CXXFLAGS"
4302 LIBS="$ac_save_LIBS"
4303 AC_LANG_RESTORE
4304 ])
4306 dnl
4307 dnl Check whether sysctl is available in <pthread.h>, and define _GLIBCXX_USE_SYSCTL_HW_NCPU.
4308 dnl
4309 AC_DEFUN([GLIBCXX_CHECK_SYSCTL_HW_NCPU], [
4311 AC_LANG_SAVE
4312 AC_LANG_CPLUSPLUS
4313 ac_save_CXXFLAGS="$CXXFLAGS"
4314 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4316 AC_MSG_CHECKING([for hw.ncpu sysctl])
4317 AC_CACHE_VAL(glibcxx_cv_SYSCTL_HW_NCPU, [
4318 GCC_TRY_COMPILE_OR_LINK(
4319 [
4320 #include <stddef.h>
4321 #include <sys/sysctl.h>
4322 ],
4323 [
4324 int count;
4325 size_t size = sizeof(count);
4326 int mib[] = { CTL_HW, HW_NCPU };
4327 sysctl(mib, 2, &count, &size, NULL, 0);
4328 ],
4329 [glibcxx_cv_SYSCTL_HW_NCPU=yes],
4330 [glibcxx_cv_SYSCTL_HW_NCPU=no])
4331 ])
4332 if test $glibcxx_cv_SYSCTL_HW_NCPU = yes; then
4333 AC_DEFINE(_GLIBCXX_USE_SYSCTL_HW_NCPU, 1, [Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>.])
4334 fi
4335 AC_MSG_RESULT($glibcxx_cv_SYSCTL_HW_NCPU)
4337 CXXFLAGS="$ac_save_CXXFLAGS"
4338 AC_LANG_RESTORE
4339 ])
4341 dnl
4342 dnl Check to see if python pretty printing can be activated.
4343 dnl
4344 dnl --with-python-dir=dir
4345 dnl installs directory into $prefix/dir
4346 AC_DEFUN([GLIBCXX_ENABLE_PYTHON], [
4348 AC_MSG_CHECKING([for custom python install directory])
4349 AC_ARG_WITH([python-dir],
4350 AS_HELP_STRING([--with-python-dir],
4351 [the location to install Python modules. This path is relative starting from the prefix.]),
4352 [with_python_dir=$withval], [with_python_dir="no"])
4353 AC_MSG_RESULT(${with_python_dir})
4355 # Needed for installing Python modules during make install.
4356 python_mod_dir="${with_python_dir}"
4357 AC_SUBST(python_mod_dir)
4358 GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
4359 ])
4361 dnl
4362 dnl Check to see if -Werror is disabled.
4363 dnl
4364 dnl --enable-werror/--disable-werror
4365 AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
4366 AC_MSG_CHECKING([for -Werror])
4367 GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
4368 AC_MSG_RESULT($enable_werror)
4369 GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
4370 ])
4372 dnl
4373 dnl Check whether obsolescent tmpnam is available in <stdio.h>,
4374 dnl and define _GLIBCXX_USE_TMPNAM.
4375 dnl
4376 AC_DEFUN([GLIBCXX_CHECK_TMPNAM], [dnl
4377 dnl
4378 AC_LANG_SAVE
4379 AC_LANG_CPLUSPLUS
4380 ac_save_CXXFLAGS="$CXXFLAGS"
4381 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4382 dnl
4383 AC_MSG_CHECKING([for tmpnam])
4384 AC_CACHE_VAL(glibcxx_cv_TMPNAM, [dnl
4385 GCC_TRY_COMPILE_OR_LINK(
4386 [#include <stdio.h>],
4387 [char *tmp = tmpnam(NULL);],
4388 [glibcxx_cv_TMPNAM=yes],
4389 [glibcxx_cv_TMPNAM=no])
4390 ])
4391 if test $glibcxx_cv_TMPNAM = yes; then
4392 AC_DEFINE(_GLIBCXX_USE_TMPNAM, 1, [Define if obsolescent tmpnam is available in <stdio.h>.])
4393 fi
4394 AC_MSG_RESULT($glibcxx_cv_TMPNAM)
4395 dnl
4396 CXXFLAGS="$ac_save_CXXFLAGS"
4397 AC_LANG_RESTORE
4398 ])
4400 dnl
4401 dnl Check to see if sys/sdt.h exists and that it is suitable for use.
4402 dnl Some versions of sdt.h were not compatible with C++11.
4403 dnl
4404 AC_DEFUN([GLIBCXX_CHECK_SDT_H], [
4405 AC_MSG_CHECKING([for suitable sys/sdt.h])
4406 # Note that this test has to be run with the C language.
4407 # Otherwise, sdt.h will try to include some headers from
4408 # libstdc++ itself.
4409 AC_LANG_SAVE
4410 AC_LANG_C
4411 AC_CACHE_VAL(glibcxx_cv_sys_sdt_h, [
4412 # Because we have to run the test in C, we use grep rather
4413 # than the compiler to check for the bug. The bug is that
4414 # were strings without trailing whitespace, causing g++
4415 # to look for operator"". The pattern searches for the fixed
4416 # output.
4417 AC_EGREP_CPP([ \",\" ], [
4418 #include <sys/sdt.h>
4419 int f() { STAP_PROBE(hi, bob); }
4420 ], [glibcxx_cv_sys_sdt_h=yes], [glibcxx_cv_sys_sdt_h=no])
4421 ])
4422 AC_LANG_RESTORE
4423 if test $glibcxx_cv_sys_sdt_h = yes; then
4424 AC_DEFINE(HAVE_SYS_SDT_H, 1,
4425 [Define to 1 if you have a suitable <sys/sdt.h> header file])
4426 fi
4427 AC_MSG_RESULT($glibcxx_cv_sys_sdt_h)
4428 ])
4430 dnl
4431 dnl Control whether the library should define symbols for old and new ABIs.
4432 dnl This affects definitions of strings, stringstreams and locale facets.
4433 dnl
4434 dnl --disable-libstdcxx-dual-abi will use old ABI for all types.
4435 dnl
4436 dnl Defines:
4437 dnl _GLIBCXX_USE_DUAL_ABI (always defined, either to 1 or 0)
4438 dnl
4439 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_DUAL_ABI], [
4440 GLIBCXX_ENABLE(libstdcxx-dual-abi,$1,,[support two versions of std::string])
4441 if test x$enable_symvers = xgnu-versioned-namespace; then
4442 # gnu-versioned-namespace is incompatible with the dual ABI.
4443 enable_libstdcxx_dual_abi="no"
4444 fi
4445 if test x"$enable_libstdcxx_dual_abi" != xyes; then
4446 AC_MSG_NOTICE([dual ABI is disabled])
4447 default_libstdcxx_abi="gcc4-compatible"
4448 fi
4449 GLIBCXX_CONDITIONAL(ENABLE_DUAL_ABI, test $enable_libstdcxx_dual_abi = yes)
4450 ])
4452 dnl
4453 dnl Check to see which ABI should be enabled by default.
4454 dnl
4455 dnl --with-default-libstdcxx-abi={gcc4-compatible,new}
4456 dnl
4457 dnl Defines:
4458 dnl _GLIBCXX_USE_CXX11_ABI (always defined, either to 1 or 0)
4459 dnl
4460 AC_DEFUN([GLIBCXX_DEFAULT_ABI], [
4461 if test x$enable_libstdcxx_dual_abi = xyes; then
4462 AC_MSG_CHECKING([for default std::string ABI to use])
4463 AC_ARG_WITH([default-libstdcxx-abi],
4464 AS_HELP_STRING([--with-default-libstdcxx-abi],
4465 [set the std::string ABI to use by default]),
4466 [case "$withval" in
4467 gcc4-compatible) default_libstdcxx_abi="gcc4-compatible" ;;
4468 new|cxx11) default_libstdcxx_abi="new" ;;
4469 c++*|gnu++*) AC_MSG_ERROR([Supported arguments for --with-default-libstdcxx-abi have changed, use "new" or "gcc4-compatible"]) ;;
4470 *) AC_MSG_ERROR([Invalid argument for --with-default-libstdcxx-abi]) ;;
4471 esac
4472 ],
4473 [default_libstdcxx_abi="new"])
4474 AC_MSG_RESULT(${default_libstdcxx_abi})
4475 fi
4476 if test $default_libstdcxx_abi = "new"; then
4477 glibcxx_cxx11_abi=1
4478 glibcxx_cxx98_abi=0
4479 else
4480 glibcxx_cxx11_abi=0
4481 glibcxx_cxx98_abi=1
4482 fi
4483 AC_SUBST(glibcxx_cxx98_abi)
4484 GLIBCXX_CONDITIONAL(ENABLE_CXX11_ABI, test $glibcxx_cxx11_abi = 1)
4485 ])
4487 dnl
4488 dnl Check to see whether to build libstdc++fs.a
4489 dnl
4490 dnl --enable-libstdcxx-filesystem-ts
4491 dnl
4492 AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
4493 GLIBCXX_ENABLE(libstdcxx-filesystem-ts,auto,,
4494 [turns on ISO/IEC TS 18822 support],
4495 [permit yes|no|auto])
4497 AC_MSG_CHECKING([whether to build Filesystem TS support])
4498 if test x"$ac_cv_header_dirent_h" != x"yes"; then
4499 enable_libstdcxx_filesystem_ts=no
4500 fi
4501 if test x"$enable_libstdcxx_filesystem_ts" = x"auto"; then
4502 case "${target_os}" in
4503 freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
4504 enable_libstdcxx_filesystem_ts=yes
4505 ;;
4506 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
4507 enable_libstdcxx_filesystem_ts=yes
4508 ;;
4509 rtems*)
4510 enable_libstdcxx_filesystem_ts=yes
4511 ;;
4512 solaris*)
4513 enable_libstdcxx_filesystem_ts=yes
4514 ;;
4515 mingw*)
4516 enable_libstdcxx_filesystem_ts=yes
4517 ;;
4518 *)
4519 enable_libstdcxx_filesystem_ts=no
4520 ;;
4521 esac
4522 fi
4523 AC_MSG_RESULT($enable_libstdcxx_filesystem_ts)
4524 GLIBCXX_CONDITIONAL(ENABLE_FILESYSTEM_TS, test $enable_libstdcxx_filesystem_ts = yes)
4525 ])
4527 dnl
4528 dnl Check whether the library calls required by the C++17 Filesystem library
4529 dnl and the Filesystem TS are present.
4530 dnl Defines:
4531 dnl HAVE_STRUCT_DIRENT_D_TYPE
4532 dnl _GLIBCXX_USE_REALPATH
4533 dnl _GLIBCXX_USE_UTIMENSAT
4534 dnl _GLIBCXX_USE_ST_MTIM
4535 dnl _GLIBCXX_USE_FCHMOD
4536 dnl _GLIBCXX_USE_FCHMODAT
4537 dnl _GLIBCXX_USE_SENDFILE
4538 dnl HAVE_LINK
4539 dnl HAVE_READLINK
4540 dnl HAVE_SYMLINK
4541 dnl
4542 AC_DEFUN([GLIBCXX_CHECK_FILESYSTEM_DEPS], [dnl
4543 dnl
4544 AC_LANG_SAVE
4545 AC_LANG_CPLUSPLUS
4546 ac_save_CXXFLAGS="$CXXFLAGS"
4547 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4548 dnl
4549 AC_MSG_CHECKING([for struct dirent.d_type])
4550 AC_CACHE_VAL(glibcxx_cv_dirent_d_type, [dnl
4551 GCC_TRY_COMPILE_OR_LINK(
4552 [#include <dirent.h>],
4553 [
4554 struct dirent d;
4555 if (sizeof d.d_type) return 0;
4556 ],
4557 [glibcxx_cv_dirent_d_type=yes],
4558 [glibcxx_cv_dirent_d_type=no])
4559 ])
4560 if test $glibcxx_cv_dirent_d_type = yes; then
4561 AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE, 1, [Define to 1 if `d_type' is a member of `struct dirent'.])
4562 fi
4563 AC_MSG_RESULT($glibcxx_cv_dirent_d_type)
4564 dnl
4565 AC_MSG_CHECKING([for realpath])
4566 AC_CACHE_VAL(glibcxx_cv_realpath, [dnl
4567 GCC_TRY_COMPILE_OR_LINK(
4568 [
4569 #include <limits.h>
4570 #include <stdlib.h>
4571 #include <unistd.h>
4572 ],
4573 [
4574 #if _XOPEN_VERSION < 500
4575 #error
4576 #elif _XOPEN_VERSION >= 700 || defined(PATH_MAX)
4577 char *tmp = realpath((const char*)NULL, (char*)NULL);
4578 #else
4579 #error
4580 #endif
4581 ],
4582 [glibcxx_cv_realpath=yes],
4583 [glibcxx_cv_realpath=no])
4584 ])
4585 if test $glibcxx_cv_realpath = yes; then
4586 AC_DEFINE(_GLIBCXX_USE_REALPATH, 1, [Define if usable realpath is available in <stdlib.h>.])
4587 fi
4588 AC_MSG_RESULT($glibcxx_cv_realpath)
4589 dnl
4590 AC_MSG_CHECKING([for utimensat])
4591 AC_CACHE_VAL(glibcxx_cv_utimensat, [dnl
4592 GCC_TRY_COMPILE_OR_LINK(
4593 [
4594 #include <fcntl.h>
4595 #include <sys/stat.h>
4596 ],
4597 [
4598 struct timespec ts[2] = { { 0, UTIME_OMIT }, { 1, 1 } };
4599 int i = utimensat(AT_FDCWD, "path", ts, 0);
4600 ],
4601 [glibcxx_cv_utimensat=yes],
4602 [glibcxx_cv_utimensat=no])
4603 ])
4604 if test $glibcxx_cv_utimensat = yes; then
4605 AC_DEFINE(_GLIBCXX_USE_UTIMENSAT, 1, [Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and AT_FDCWD in <fcntl.h>.])
4606 fi
4607 AC_MSG_RESULT($glibcxx_cv_utimensat)
4608 dnl
4609 AC_MSG_CHECKING([for utime])
4610 AC_CACHE_VAL(glibcxx_cv_utime, [dnl
4611 GCC_TRY_COMPILE_OR_LINK(
4612 [
4613 #include <utime.h>
4614 ],
4615 [
4616 struct utimbuf t = { 1, 1 };
4617 int i = utime("path", &t);
4618 ],
4619 [glibcxx_cv_utime=yes],
4620 [glibcxx_cv_utime=no])
4621 ])
4622 if test $glibcxx_cv_utime = yes; then
4623 AC_DEFINE(_GLIBCXX_USE_UTIME, 1, [Define if utime is available in <utime.h>.])
4624 fi
4625 AC_MSG_RESULT($glibcxx_cv_utime)
4626 dnl
4627 AC_MSG_CHECKING([for lstat])
4628 AC_CACHE_VAL(glibcxx_cv_lstat, [dnl
4629 GCC_TRY_COMPILE_OR_LINK(
4630 [ #include <sys/stat.h> ],
4631 [
4632 struct stat st;
4633 int i = lstat("path", &st);
4634 ],
4635 [glibcxx_cv_lstat=yes],
4636 [glibcxx_cv_lstat=no])
4637 ])
4638 if test $glibcxx_cv_lstat = yes; then
4639 AC_DEFINE(_GLIBCXX_USE_LSTAT, 1, [Define if lstat is available in <sys/stat.h>.])
4640 fi
4641 AC_MSG_RESULT($glibcxx_cv_lstat)
4642 dnl
4643 AC_MSG_CHECKING([for struct stat.st_mtim.tv_nsec])
4644 AC_CACHE_VAL(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 $glibcxx_cv_st_mtim = yes; then
4655 AC_DEFINE(_GLIBCXX_USE_ST_MTIM, 1, [Define if struct stat has timespec members.])
4656 fi
4657 AC_MSG_RESULT($glibcxx_cv_st_mtim)
4658 dnl
4659 AC_MSG_CHECKING([for fchmod])
4660 AC_CACHE_VAL(glibcxx_cv_fchmod, [dnl
4661 GCC_TRY_COMPILE_OR_LINK(
4662 [#include <sys/stat.h>],
4663 [fchmod(1, S_IWUSR);],
4664 [glibcxx_cv_fchmod=yes],
4665 [glibcxx_cv_fchmod=no])
4666 ])
4667 if test $glibcxx_cv_fchmod = yes; then
4668 AC_DEFINE(_GLIBCXX_USE_FCHMOD, 1, [Define if fchmod is available in <sys/stat.h>.])
4669 fi
4670 AC_MSG_RESULT($glibcxx_cv_fchmod)
4671 dnl
4672 AC_MSG_CHECKING([for fchmodat])
4673 AC_CACHE_VAL(glibcxx_cv_fchmodat, [dnl
4674 GCC_TRY_COMPILE_OR_LINK(
4675 [
4676 #include <fcntl.h>
4677 #include <sys/stat.h>
4678 ],
4679 [fchmodat(AT_FDCWD, "", 0, AT_SYMLINK_NOFOLLOW);],
4680 [glibcxx_cv_fchmodat=yes],
4681 [glibcxx_cv_fchmodat=no])
4682 ])
4683 if test $glibcxx_cv_fchmodat = yes; then
4684 AC_DEFINE(_GLIBCXX_USE_FCHMODAT, 1, [Define if fchmodat is available in <sys/stat.h>.])
4685 fi
4686 AC_MSG_RESULT($glibcxx_cv_fchmodat)
4687 dnl
4688 AC_MSG_CHECKING([for sendfile that can copy files])
4689 AC_CACHE_VAL(glibcxx_cv_sendfile, [dnl
4690 case "${target_os}" in
4691 gnu* | linux* | solaris* | uclinux*)
4692 GCC_TRY_COMPILE_OR_LINK(
4693 [#include <sys/sendfile.h>],
4694 [sendfile(1, 2, (off_t*)0, sizeof 1);],
4695 [glibcxx_cv_sendfile=yes],
4696 [glibcxx_cv_sendfile=no])
4697 ;;
4698 *)
4699 glibcxx_cv_sendfile=no
4700 ;;
4701 esac
4702 ])
4703 if test $glibcxx_cv_sendfile = yes; then
4704 AC_DEFINE(_GLIBCXX_USE_SENDFILE, 1, [Define if sendfile is available in <sys/sendfile.h>.])
4705 fi
4706 AC_MSG_RESULT($glibcxx_cv_sendfile)
4707 dnl
4708 AC_MSG_CHECKING([for link])
4709 AC_CACHE_VAL(glibcxx_cv_link, [dnl
4710 GCC_TRY_COMPILE_OR_LINK(
4711 [#include <unistd.h>],
4712 [link("", "");],
4713 [glibcxx_cv_link=yes],
4714 [glibcxx_cv_link=no])
4715 ])
4716 if test $glibcxx_cv_link = yes; then
4717 AC_DEFINE(HAVE_LINK, 1, [Define if link is available in <unistd.h>.])
4718 fi
4719 AC_MSG_RESULT($glibcxx_cv_link)
4720 dnl
4721 AC_MSG_CHECKING([for readlink])
4722 AC_CACHE_VAL(glibcxx_cv_readlink, [dnl
4723 GCC_TRY_COMPILE_OR_LINK(
4724 [#include <unistd.h>],
4725 [char buf[32]; readlink("", buf, sizeof(buf));],
4726 [glibcxx_cv_readlink=yes],
4727 [glibcxx_cv_readlink=no])
4728 ])
4729 if test $glibcxx_cv_readlink = yes; then
4730 AC_DEFINE(HAVE_READLINK, 1, [Define if readlink is available in <unistd.h>.])
4731 fi
4732 AC_MSG_RESULT($glibcxx_cv_readlink)
4733 dnl
4734 AC_MSG_CHECKING([for symlink])
4735 AC_CACHE_VAL(glibcxx_cv_symlink, [dnl
4736 GCC_TRY_COMPILE_OR_LINK(
4737 [#include <unistd.h>],
4738 [symlink("", "");],
4739 [glibcxx_cv_symlink=yes],
4740 [glibcxx_cv_symlink=no])
4741 ])
4742 if test $glibcxx_cv_symlink = yes; then
4743 AC_DEFINE(HAVE_SYMLINK, 1, [Define if symlink is available in <unistd.h>.])
4744 fi
4745 AC_MSG_RESULT($glibcxx_cv_symlink)
4746 dnl
4747 AC_MSG_CHECKING([for truncate])
4748 AC_CACHE_VAL(glibcxx_cv_truncate, [dnl
4749 GCC_TRY_COMPILE_OR_LINK(
4750 [#include <unistd.h>],
4751 [truncate("", 99);],
4752 [glibcxx_cv_truncate=yes],
4753 [glibcxx_cv_truncate=no])
4754 ])
4755 if test $glibcxx_cv_truncate = yes; then
4756 AC_DEFINE(HAVE_TRUNCATE, 1, [Define if truncate is available in <unistd.h>.])
4757 fi
4758 AC_MSG_RESULT($glibcxx_cv_truncate)
4759 dnl
4760 CXXFLAGS="$ac_save_CXXFLAGS"
4761 AC_LANG_RESTORE
4762 ])
4764 dnl
4765 dnl Check how size_t is mangled. Copied from libitm.
4766 dnl
4767 AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
4768 AC_CACHE_CHECK([how size_t is mangled],
4769 glibcxx_cv_size_t_mangling, [
4770 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
4771 [glibcxx_cv_size_t_mangling=m], [
4772 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
4773 [glibcxx_cv_size_t_mangling=j], [
4774 AC_TRY_COMPILE([],
4775 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
4776 [glibcxx_cv_size_t_mangling=y], [
4777 AC_TRY_COMPILE([],
4778 [extern __SIZE_TYPE__ x; extern unsigned short x;],
4779 [glibcxx_cv_size_t_mangling=t], [
4780 AC_TRY_COMPILE([],
4781 [extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
4782 [glibcxx_cv_size_t_mangling=u6uint20],
4783 [glibcxx_cv_size_t_mangling=x])
4784 ])
4785 ])
4786 ])
4787 ])
4788 ])
4789 if test $glibcxx_cv_size_t_mangling = x; then
4790 AC_MSG_ERROR([Unknown underlying type for size_t])
4791 fi
4792 AC_DEFINE_UNQUOTED(_GLIBCXX_MANGLE_SIZE_T, [$glibcxx_cv_size_t_mangling],
4793 [Define to the letter to which size_t is mangled.])
4794 ])
4796 dnl
4797 dnl Determine whether std::exception_ptr symbols should be exported with
4798 dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
4799 dnl release first added support for std::exception_ptr. Originally it was
4800 dnl only supported for targets with always-lock-free atomics for int, but
4801 dnl since GCC 7.1 it is supported for all targets.
4802 dnl
4803 AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
4804 if test $enable_symvers != no; then
4805 AC_MSG_CHECKING([for first version to support std::exception_ptr])
4806 case ${target} in
4807 aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
4808 m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
4809 ac_exception_ptr_since_gcc46=yes
4810 ;;
4811 *)
4812 # If the value of this macro changes then we will need to hardcode
4813 # yes/no here for additional targets based on the original value.
4814 AC_TRY_COMPILE([], [
4815 #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
4816 # error atomic int not always lock free
4817 #endif
4818 ],
4819 [ac_exception_ptr_since_gcc46=yes],
4820 [ac_exception_ptr_since_gcc46=no])
4821 ;;
4822 esac
4823 if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
4824 AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
4825 [Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
4826 AC_MSG_RESULT([4.6.0])
4827 else
4828 AC_MSG_RESULT([7.1.0])
4829 fi
4830 fi
4831 ])
4833 # Macros from the top-level gcc directory.
4834 m4_include([../config/gc++filt.m4])
4835 m4_include([../config/tls.m4])
4836 m4_include([../config/gthr.m4])
4837 m4_include([../config/cet.m4])