| blob | 1c0a4c130525466bf12fd6892fb624d0b95636de |
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 int64_t is available in <stdint.h>, and define HAVE_INT64_T.
479 dnl Also check whether int64_t is actually a typedef to long or long long.
480 dnl
481 AC_DEFUN([GLIBCXX_CHECK_INT64_T], [
483 AC_LANG_SAVE
484 AC_LANG_CPLUSPLUS
486 AC_MSG_CHECKING([for int64_t])
487 AC_CACHE_VAL(glibcxx_cv_INT64_T, [
488 AC_TRY_COMPILE(
489 [#include <stdint.h>],
490 [int64_t var;],
491 [glibcxx_cv_INT64_T=yes],
492 [glibcxx_cv_INT64_T=no])
493 ])
495 if test $glibcxx_cv_INT64_T = yes; then
496 AC_DEFINE(HAVE_INT64_T, 1, [Define if int64_t is available in <stdint.h>.])
497 AC_MSG_RESULT($glibcxx_cv_INT64_T)
499 AC_MSG_CHECKING([for int64_t as long])
500 AC_CACHE_VAL(glibcxx_cv_int64_t_long, [
501 AC_TRY_COMPILE(
502 [#include <stdint.h>
503 template<typename, typename> struct same { enum { value = -1 }; };
504 template<typename Tp> struct same<Tp, Tp> { enum { value = 1 }; };
505 int array[same<int64_t, long>::value];], [],
506 [glibcxx_cv_int64_t_long=yes], [glibcxx_cv_int64_t_long=no])
507 ])
509 if test $glibcxx_cv_int64_t_long = yes; then
510 AC_DEFINE(HAVE_INT64_T_LONG, 1, [Define if int64_t is a long.])
511 AC_MSG_RESULT($glibcxx_cv_int64_t_long)
512 fi
514 AC_MSG_CHECKING([for int64_t as long long])
515 AC_CACHE_VAL(glibcxx_cv_int64_t_long_long, [
516 AC_TRY_COMPILE(
517 [#include <stdint.h>
518 template<typename, typename> struct same { enum { value = -1 }; };
519 template<typename Tp> struct same<Tp, Tp> { enum { value = 1 }; };
520 int array[same<int64_t, long long>::value];], [],
521 [glibcxx_cv_int64_t_long_long=yes], [glibcxx_cv_int64_t_long_long=no])
522 ])
524 if test $glibcxx_cv_int64_t_long_long = yes; then
525 AC_DEFINE(HAVE_INT64_T_LONG_LONG, 1, [Define if int64_t is a long long.])
526 AC_MSG_RESULT($glibcxx_cv_int64_t_long_long)
527 fi
528 fi
530 AC_LANG_RESTORE
531 ])
534 dnl
535 dnl Check whether LFS support is available.
536 dnl
537 AC_DEFUN([GLIBCXX_CHECK_LFS], [
538 AC_LANG_SAVE
539 AC_LANG_CPLUSPLUS
540 ac_save_CXXFLAGS="$CXXFLAGS"
541 CXXFLAGS="$CXXFLAGS -fno-exceptions"
542 AC_MSG_CHECKING([for LFS support])
543 AC_CACHE_VAL(glibcxx_cv_LFS, [
544 GCC_TRY_COMPILE_OR_LINK(
545 [#include <unistd.h>
546 #include <stdio.h>
547 #include <sys/stat.h>
548 ],
549 [FILE* fp;
550 fopen64("t", "w");
551 fseeko64(fp, 0, SEEK_CUR);
552 ftello64(fp);
553 lseek64(1, 0, SEEK_CUR);
554 struct stat64 buf;
555 fstat64(1, &buf);],
556 [glibcxx_cv_LFS=yes],
557 [glibcxx_cv_LFS=no])
558 ])
559 if test $glibcxx_cv_LFS = yes; then
560 AC_DEFINE(_GLIBCXX_USE_LFS, 1, [Define if LFS support is available.])
561 fi
562 AC_MSG_RESULT($glibcxx_cv_LFS)
563 CXXFLAGS="$ac_save_CXXFLAGS"
564 AC_LANG_RESTORE
565 ])
568 dnl
569 dnl Check for whether a fully dynamic basic_string implementation should
570 dnl be turned on, that does not put empty objects in per-process static
571 dnl memory (mostly useful together with shared memory allocators, see PR
572 dnl libstdc++/16612 for details).
573 dnl
574 dnl --enable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 1
575 dnl --disable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 0
576 dnl otherwise undefined
577 dnl + Usage: GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING[(DEFAULT)]
578 dnl Where DEFAULT is either `yes' or `no'.
579 dnl
580 AC_DEFUN([GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING], [
581 GLIBCXX_ENABLE(fully-dynamic-string,$1,,[do not put empty strings in per-process static memory])
582 if test $enable_fully_dynamic_string = yes; then
583 enable_fully_dynamic_string_def=1
584 else
585 enable_fully_dynamic_string_def=0
586 fi
587 AC_DEFINE_UNQUOTED([_GLIBCXX_FULLY_DYNAMIC_STRING], [${enable_fully_dynamic_string_def}],
588 [Define to 1 if a fully dynamic basic_string is wanted, 0 to disable, undefined for platform defaults])
589 ])
592 dnl
593 dnl Does any necessary configuration of the testsuite directory. Generates
594 dnl the testsuite_hooks.h header.
595 dnl
596 dnl GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE must be done before this.
597 dnl
598 dnl Sets:
599 dnl enable_abi_check
600 dnl GLIBCXX_TEST_WCHAR_T
601 dnl GLIBCXX_TEST_THREAD
602 dnl Substs:
603 dnl baseline_dir
604 dnl baseline_subdir_switch
605 dnl
606 AC_DEFUN([GLIBCXX_CONFIGURE_TESTSUITE], [
607 # Do checks for resource limit functions.
608 GLIBCXX_CHECK_SETRLIMIT
610 if $GLIBCXX_IS_NATIVE ; then
611 # Look for setenv, so that extended locale tests can be performed.
612 GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_3(setenv)
613 fi
615 if $GLIBCXX_IS_NATIVE && test $is_hosted = yes &&
616 test $enable_symvers != no; then
617 case "$host" in
618 *-*-cygwin*)
619 enable_abi_check=no ;;
620 *)
621 enable_abi_check=yes ;;
622 esac
623 else
624 # Only build this as native, since automake does not understand
625 # CXX_FOR_BUILD.
626 enable_abi_check=no
627 fi
629 # Export file names for ABI checking.
630 baseline_dir="$glibcxx_srcdir/config/abi/post/${abi_baseline_pair}"
631 AC_SUBST(baseline_dir)
632 baseline_subdir_switch="$abi_baseline_subdir_switch"
633 AC_SUBST(baseline_subdir_switch)
634 ])
637 dnl
638 dnl Does any necessary configuration for docbook in the docs directory.
639 dnl
640 dnl XSLTPROC must be set before this
641 dnl
642 dnl Sets:
643 dnl glibcxx_stylesheets
644 dnl Substs:
645 dnl XSL_STYLE_DIR
646 dnl
647 AC_DEFUN([GLIBCXX_CONFIGURE_DOCBOOK], [
649 glibcxx_docbook_url=http://docbook.sourceforge.net/release/xsl-ns/current/
651 AC_MSG_CHECKING([for local stylesheet directory])
652 glibcxx_local_stylesheets=no
653 if test x${XMLCATALOG} = xyes && xsl_style_dir=`xmlcatalog "" $glibcxx_docbook_url 2>/dev/null`
654 then
655 XSL_STYLE_DIR=`echo $xsl_style_dir | sed -n 's;^file://;;p'`
656 glibcxx_local_stylesheets=yes
657 else
658 for dir in \
659 /usr/share/sgml/docbook/xsl-ns-stylesheets \
660 /usr/share/xml/docbook/stylesheet/docbook-xsl-ns \
661 /usr/share/xml/docbook/stylesheet/nwalsh5/current \
662 /usr/share/xml/docbook/stylesheet/nwalsh/current
663 do
664 if test -d $dir; then
665 glibcxx_local_stylesheets=yes
666 XSL_STYLE_DIR=$dir
667 break
668 fi
669 done
670 fi
671 AC_MSG_RESULT($glibcxx_local_stylesheets)
673 if test x"$glibcxx_local_stylesheets" = x"yes"; then
674 AC_SUBST(XSL_STYLE_DIR)
675 AC_MSG_NOTICE($XSL_STYLE_DIR)
677 AC_MSG_CHECKING([for docbook stylesheets for documentation creation])
678 glibcxx_stylesheets=no
679 if test x${XMLCATALOG} = xno || xmlcatalog "" $glibcxx_docbook_url/xhtml/docbook.xsl >/dev/null 2>&1; then
680 if test x${XSLTPROC} = xyes && echo '<title/>' | xsltproc --noout --nonet --xinclude $glibcxx_docbook_url/xhtml/docbook.xsl - 2>/dev/null; then
681 glibcxx_stylesheets=yes
682 fi
683 fi
684 AC_MSG_RESULT($glibcxx_stylesheets)
686 else
687 glibcxx_stylesheets=no
688 fi
690 # Check for epub3 dependencies.
691 AC_MSG_CHECKING([for epub3 stylesheets for documentation creation])
692 glibcxx_epub_stylesheets=no
693 if test x"$glibcxx_local_stylesheets" = x"yes"; then
694 if test -f "$XSL_STYLE_DIR/epub3/chunk.xsl"; then
695 glibcxx_epub_stylesheets=yes
696 fi
697 fi
698 AC_MSG_RESULT($glibcxx_epub_stylesheets)
699 AM_CONDITIONAL(BUILD_EPUB, test x"$glibcxx_epub_stylesheets" = x"yes")
701 ])
704 dnl
705 dnl Set up *_INCLUDES variables for all sundry Makefile.am's.
706 dnl
707 dnl Substs:
708 dnl GLIBCXX_INCLUDES
709 dnl TOPLEVEL_INCLUDES
710 dnl
711 AC_DEFUN([GLIBCXX_EXPORT_INCLUDES], [
712 # Used for every C++ compile we perform.
713 GLIBCXX_INCLUDES="\
714 -I$glibcxx_builddir/include/$host_alias \
715 -I$glibcxx_builddir/include \
716 -I$glibcxx_srcdir/libsupc++"
718 # For Canadian crosses, pick this up too.
719 if test $CANADIAN = yes; then
720 GLIBCXX_INCLUDES="$GLIBCXX_INCLUDES -I\${includedir}"
721 fi
723 # Stuff in the actual top level. Currently only used by libsupc++ to
724 # get unwind* headers from the libgcc dir.
725 #TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc -I$(toplevel_srcdir)/include'
726 TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc'
728 # Now, export this to all the little Makefiles....
729 AC_SUBST(GLIBCXX_INCLUDES)
730 AC_SUBST(TOPLEVEL_INCLUDES)
731 ])
734 dnl
735 dnl Set up *_FLAGS and *FLAGS variables for all sundry Makefile.am's.
736 dnl (SECTION_FLAGS is done under CHECK_COMPILER_FEATURES.)
737 dnl
738 dnl Substs:
739 dnl OPTIMIZE_CXXFLAGS
740 dnl WARN_FLAGS
741 dnl
742 AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
743 # Optimization flags that are probably a good idea for thrill-seekers. Just
744 # uncomment the lines below and make, everything else is ready to go...
745 # Alternatively OPTIMIZE_CXXFLAGS can be set in configure.host.
746 # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
747 AC_SUBST(OPTIMIZE_CXXFLAGS)
749 WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
750 AC_SUBST(WARN_FLAGS)
751 ])
754 dnl
755 dnl All installation directory information is determined here.
756 dnl
757 dnl Substs:
758 dnl gxx_install_dir
759 dnl glibcxx_prefixdir
760 dnl glibcxx_toolexecdir
761 dnl glibcxx_toolexeclibdir
762 dnl
763 dnl Assumes cross_compiling bits already done, and with_cross_host in
764 dnl particular.
765 dnl
766 dnl This logic must match gcc/configure.ac's setting of gcc_gxx_include_dir.
767 dnl config/gxx-include-dir.m4 must be kept consistant with this as well.
768 AC_DEFUN([GLIBCXX_EXPORT_INSTALL_INFO], [
769 glibcxx_toolexecdir=no
770 glibcxx_toolexeclibdir=no
771 glibcxx_prefixdir=$prefix
773 AC_MSG_CHECKING([for gxx-include-dir])
774 AC_ARG_WITH([gxx-include-dir],
775 AC_HELP_STRING([--with-gxx-include-dir=DIR],
776 [installation directory for include files]),
777 [case "$withval" in
778 yes) AC_MSG_ERROR([Missing directory for --with-gxx-include-dir]) ;;
779 no) gxx_include_dir=no ;;
780 *) gxx_include_dir=$withval ;;
781 esac],
782 [gxx_include_dir=no])
783 AC_MSG_RESULT($gxx_include_dir)
785 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
786 AC_ARG_ENABLE([version-specific-runtime-libs],
787 AC_HELP_STRING([--enable-version-specific-runtime-libs],
788 [Specify that runtime libraries should be installed in a compiler-specific directory]),
789 [case "$enableval" in
790 yes) version_specific_libs=yes ;;
791 no) version_specific_libs=no ;;
792 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
793 esac],
794 [version_specific_libs=no])
795 AC_MSG_RESULT($version_specific_libs)
797 GCC_WITH_TOOLEXECLIBDIR
799 # Default case for install directory for include files.
800 if test $version_specific_libs = no && test $gxx_include_dir = no; then
801 gxx_include_dir='include/c++/${gcc_version}'
802 if test -n "$with_cross_host" &&
803 test x"$with_cross_host" != x"no"; then
804 gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"
805 else
806 gxx_include_dir='${prefix}/'"$gxx_include_dir"
807 fi
808 fi
810 # Version-specific runtime libs processing.
811 if test $version_specific_libs = yes; then
812 # Need the gcc compiler version to know where to install libraries
813 # and header files if --enable-version-specific-runtime-libs option
814 # is selected. FIXME: these variables are misnamed, there are
815 # no executables installed in _toolexecdir or _toolexeclibdir.
816 if test x"$gxx_include_dir" = x"no"; then
817 gxx_include_dir='${libdir}/gcc/${host_alias}/${gcc_version}/include/c++'
818 fi
819 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
820 glibcxx_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
821 fi
823 # Calculate glibcxx_toolexecdir, glibcxx_toolexeclibdir
824 # Install a library built with a cross compiler in tooldir, not libdir.
825 if test x"$glibcxx_toolexecdir" = x"no"; then
826 if test -n "$with_cross_host" &&
827 test x"$with_cross_host" != x"no"; then
828 glibcxx_toolexecdir='${exec_prefix}/${host_alias}'
829 case ${with_toolexeclibdir} in
830 no)
831 glibcxx_toolexeclibdir='${toolexecdir}/lib'
832 ;;
833 *)
834 glibcxx_toolexeclibdir=${with_toolexeclibdir}
835 ;;
836 esac
837 else
838 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
839 glibcxx_toolexeclibdir='${libdir}'
840 fi
841 multi_os_directory=`$CXX -print-multi-os-directory`
842 case $multi_os_directory in
843 .) ;; # Avoid trailing /.
844 *) glibcxx_toolexeclibdir=$glibcxx_toolexeclibdir/$multi_os_directory ;;
845 esac
846 fi
848 AC_MSG_CHECKING([for install location])
849 AC_MSG_RESULT($gxx_include_dir)
851 AC_SUBST(glibcxx_prefixdir)
852 AC_SUBST(gxx_include_dir)
853 AC_SUBST(glibcxx_toolexecdir)
854 AC_SUBST(glibcxx_toolexeclibdir)
855 ])
858 dnl
859 dnl GLIBCXX_ENABLE
860 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
861 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
862 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
863 dnl
864 dnl See manual/appendix_porting.html#appendix.porting.build_hacking for
865 dnl documentation.
866 dnl
867 m4_define([GLIBCXX_ENABLE],[dnl
868 m4_define([_g_switch],[--enable-$1])dnl
869 m4_define([_g_help],[AC_HELP_STRING([_g_switch$3],[$4 @<:@default=$2@:>@])])dnl
870 AC_ARG_ENABLE([$1],m4_dquote(_g_help),
871 m4_bmatch([$5],
872 [^permit ],
873 [[
874 case "$enableval" in
875 m4_bpatsubst([$5],[permit ])) ;;
876 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
877 dnl Idea for future: generate a URL pointing to
878 dnl "onlinedocs/configopts.html#whatever"
879 esac
880 ]],
881 [^$],
882 [[
883 case "$enableval" in
884 yes|no) ;;
885 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
886 esac
887 ]],
888 [[$5]]),
889 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
890 m4_undefine([_g_switch])dnl
891 m4_undefine([_g_help])dnl
892 ])
895 dnl
896 dnl Check for ISO/IEC 9899:1999 "C99" support.
897 dnl
898 dnl --enable-c99 defines _GLIBCXX_USE_C99
899 dnl --disable-c99 leaves _GLIBCXX_USE_C99 undefined
900 dnl + Usage: GLIBCXX_ENABLE_C99[(DEFAULT)]
901 dnl Where DEFAULT is either `yes' or `no'.
902 dnl + If 'C99' stuff is not available, ignores DEFAULT and sets `no'.
903 dnl
904 AC_DEFUN([GLIBCXX_ENABLE_C99], [
905 GLIBCXX_ENABLE(c99,$1,,[turns on ISO/IEC 9899:1999 support])
907 if test x"$enable_c99" = x"yes"; then
908 AC_LANG_SAVE
909 AC_LANG_CPLUSPLUS
911 # Use -std=c++98 (instead of -std=gnu++98) because leaving __STRICT_ANSI__
912 # undefined may cause fake C99 facilities, like pre-standard snprintf,
913 # to be spuriously enabled.
914 ac_save_CXXFLAGS="$CXXFLAGS"
915 CXXFLAGS="$CXXFLAGS -std=c++98"
916 ac_save_LIBS="$LIBS"
917 ac_save_gcc_no_link="$gcc_no_link"
919 if test x$gcc_no_link != xyes; then
920 # Use -fno-exceptions to that the C driver can link these tests without
921 # hitting undefined references to personality routines.
922 CXXFLAGS="$CXXFLAGS -fno-exceptions"
923 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
924 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
925 gcc_no_link=yes
926 ])
927 fi
929 # Check for the existence of <math.h> functions used if C99 is enabled.
930 AC_MSG_CHECKING([for ISO C99 support in <math.h> for C++98])
931 AC_CACHE_VAL(glibcxx_cv_c99_math_cxx98, [
932 GCC_TRY_COMPILE_OR_LINK(
933 [#include <math.h>
934 volatile double d1, d2;
935 volatile int i;],
936 [i = fpclassify(d1);
937 i = isfinite(d1);
938 i = isinf(d1);
939 i = isnan(d1);
940 i = isnormal(d1);
941 i = signbit(d1);
942 i = isgreater(d1, d2);
943 i = isgreaterequal(d1, d2);
944 i = isless(d1, d2);
945 i = islessequal(d1, d2);
946 i = islessgreater(d1, d2);
947 i = islessgreater(d1, d2);
948 i = isunordered(d1, d2);
949 ], [glibcxx_cv_c99_math_cxx98=yes], [glibcxx_cv_c99_math_cxx98=no])
950 ])
951 AC_MSG_RESULT($glibcxx_cv_c99_math_cxx98)
952 if test x"$glibcxx_cv_c99_math_cxx98" = x"yes"; then
953 AC_DEFINE(_GLIBCXX98_USE_C99_MATH, 1,
954 [Define if C99 functions or macros in <math.h> should be imported
955 in <cmath> in namespace std for C++98.])
956 fi
958 # Check for the existence of <complex.h> complex math functions.
959 # This is necessary even though libstdc++ uses the builtin versions
960 # of these functions, because if the builtin cannot be used, a reference
961 # to the library function is emitted.
962 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
963 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
964 if test x"$ac_has_complex_h" = x"yes"; then
965 AC_MSG_CHECKING([for ISO C99 support in <complex.h> for C++98])
966 AC_CACHE_VAL(glibcxx_cv_c99_complex_cxx98, [
967 GCC_TRY_COMPILE_OR_LINK(
968 [#include <complex.h>
969 typedef __complex__ float float_type;
970 typedef __complex__ double double_type;
971 typedef __complex__ long double ld_type;
972 volatile float_type tmpf;
973 volatile double_type tmpd;
974 volatile ld_type tmpld;
975 volatile float f;
976 volatile double d;
977 volatile long double ld;],
978 [f = cabsf(tmpf);
979 f = cargf(tmpf);
980 tmpf = ccosf(tmpf);
981 tmpf = ccoshf(tmpf);
982 tmpf = cexpf(tmpf);
983 tmpf = clogf(tmpf);
984 tmpf = csinf(tmpf);
985 tmpf = csinhf(tmpf);
986 tmpf = csqrtf(tmpf);
987 tmpf = ctanf(tmpf);
988 tmpf = ctanhf(tmpf);
989 tmpf = cpowf(tmpf, tmpf);
990 tmpf = cprojf(tmpf);
991 d = cabs(tmpd);
992 d = carg(tmpd);
993 tmpd = ccos(tmpd);
994 tmpd = ccosh(tmpd);
995 tmpd = cexp(tmpd);
996 tmpd = clog(tmpd);
997 tmpd = csin(tmpd);
998 tmpd = csinh(tmpd);
999 tmpd = csqrt(tmpd);
1000 tmpd = ctan(tmpd);
1001 tmpd = ctanh(tmpd);
1002 tmpd = cpow(tmpd, tmpd);
1003 tmpd = cproj(tmpd);
1004 ld = cabsl(tmpld);
1005 ld = cargl(tmpld);
1006 tmpld = ccosl(tmpld);
1007 tmpld = ccoshl(tmpld);
1008 tmpld = cexpl(tmpld);
1009 tmpld = clogl(tmpld);
1010 tmpld = csinl(tmpld);
1011 tmpld = csinhl(tmpld);
1012 tmpld = csqrtl(tmpld);
1013 tmpld = ctanl(tmpld);
1014 tmpld = ctanhl(tmpld);
1015 tmpld = cpowl(tmpld, tmpld);
1016 tmpld = cprojl(tmpld);
1017 ], [glibcxx_cv_c99_complex_cxx98=yes], [glibcxx_cv_c99_complex_cxx98=no])
1018 ])
1019 fi
1020 AC_MSG_RESULT($glibcxx_cv_c99_complex_cxx98)
1021 if test x"$glibcxx_cv_c99_complex_cxx98" = x"yes"; then
1022 AC_DEFINE(_GLIBCXX98_USE_C99_COMPLEX, 1,
1023 [Define if C99 functions in <complex.h> should be used in
1024 <complex> for C++98. Using compiler builtins for these functions
1025 requires corresponding C99 library functions to be present.])
1026 fi
1028 # Check for the existence in <stdio.h> of vscanf, et. al.
1029 AC_MSG_CHECKING([for ISO C99 support in <stdio.h> for C++98])
1030 AC_CACHE_VAL(glibcxx_cv_c99_stdio_cxx98, [
1031 GCC_TRY_COMPILE_OR_LINK(
1032 [#include <stdio.h>
1033 #include <stdarg.h>
1034 void foo(char* fmt, ...)
1035 {
1036 va_list args; va_start(args, fmt);
1037 vfscanf(stderr, "%i", args);
1038 vscanf("%i", args);
1039 vsnprintf(fmt, 0, "%i", args);
1040 vsscanf(fmt, "%i", args);
1041 snprintf(fmt, 0, "%i");
1042 }], [],
1043 [glibcxx_cv_c99_stdio_cxx98=yes], [glibcxx_cv_c99_stdio_cxx98=no])
1044 ])
1045 AC_MSG_RESULT($glibcxx_cv_c99_stdio_cxx98)
1046 if test x"$glibcxx_cv_c99_stdio_cxx98" = x"yes"; then
1047 AC_DEFINE(_GLIBCXX98_USE_C99_STDIO, 1,
1048 [Define if C99 functions or macros in <stdio.h> should be imported
1049 in <cstdio> in namespace std for C++98.])
1050 fi
1052 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
1053 AC_MSG_CHECKING([for ISO C99 support in <stdlib.h> for C++98])
1054 AC_CACHE_VAL(glibcxx_cv_c99_stdlib_cxx98, [
1055 GCC_TRY_COMPILE_OR_LINK(
1056 [#include <stdlib.h>
1057 volatile float f;
1058 volatile long double ld;
1059 volatile unsigned long long ll;
1060 lldiv_t mydivt;],
1061 [char* tmp;
1062 f = strtof("gnu", &tmp);
1063 ld = strtold("gnu", &tmp);
1064 ll = strtoll("gnu", &tmp, 10);
1065 ll = strtoull("gnu", &tmp, 10);
1066 ll = llabs(10);
1067 mydivt = lldiv(10,1);
1068 ll = mydivt.quot;
1069 ll = mydivt.rem;
1070 ll = atoll("10");
1071 _Exit(0);
1072 ], [glibcxx_cv_c99_stdlib_cxx98=yes], [glibcxx_cv_c99_stdlib_cxx98=no])
1073 ])
1074 AC_MSG_RESULT($glibcxx_cv_c99_stdlib_cxx98)
1075 if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
1076 AC_DEFINE(_GLIBCXX98_USE_C99_STDLIB, 1,
1077 [Define if C99 functions or macros in <stdlib.h> should be imported
1078 in <cstdlib> in namespace std for C++98.])
1079 fi
1081 # Check for the existence in <wchar.h> of wcstold, etc.
1082 if test x"$ac_has_wchar_h" = xyes &&
1083 test x"$ac_has_wctype_h" = xyes; then
1084 AC_MSG_CHECKING([for ISO C99 support in <wchar.h> for C++98])
1085 AC_CACHE_VAL(glibcxx_cv_c99_wchar_cxx98, [
1086 AC_TRY_COMPILE([#include <wchar.h>
1087 namespace test
1088 {
1089 using ::wcstold;
1090 using ::wcstoll;
1091 using ::wcstoull;
1092 }
1093 ], [], [glibcxx_cv_c99_wchar_cxx98=yes], [glibcxx_cv_c99_wchar_cxx98=no])
1094 ])
1096 # Checks for wide character functions that may not be present.
1097 # Injection of these is wrapped with guard macros.
1098 # NB: only put functions here, instead of immediately above, if
1099 # absolutely necessary.
1100 AC_TRY_COMPILE([#include <wchar.h>
1101 namespace test { using ::vfwscanf; }], [],
1102 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1104 AC_TRY_COMPILE([#include <wchar.h>
1105 namespace test { using ::vswscanf; }], [],
1106 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1108 AC_TRY_COMPILE([#include <wchar.h>
1109 namespace test { using ::vwscanf; }], [],
1110 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1112 AC_TRY_COMPILE([#include <wchar.h>
1113 namespace test { using ::wcstof; }], [],
1114 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1116 AC_TRY_COMPILE([#include <wctype.h>],
1117 [wint_t t; int i = iswblank(t);],
1118 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1120 AC_MSG_RESULT($glibcxx_cv_c99_wchar_cxx98)
1121 if test x"$glibcxx_cv_c99_wchar_cxx98" = x"yes"; then
1122 AC_DEFINE(_GLIBCXX98_USE_C99_WCHAR, 1,
1123 [Define if C99 functions or macros in <wchar.h> should be imported
1124 in <cwchar> in namespace std for C++98.])
1125 fi
1126 fi
1128 # Option parsed, now set things appropriately.
1129 if test x"$glibcxx_cv_c99_math_cxx98" = x"no" ||
1130 test x"$glibcxx_cv_c99_complex_cxx98" = x"no" ||
1131 test x"$glibcxx_cv_c99_stdio_cxx98" = x"no" ||
1132 test x"$glibcxx_cv_c99_stdlib_cxx98" = x"no" ||
1133 test x"$glibcxx_cv_c99_wchar_cxx98" = x"no"; then
1134 enable_c99=no;
1135 else
1136 AC_DEFINE(_GLIBCXX_USE_C99, 1,
1137 [Define if C99 functions or macros from <wchar.h>, <math.h>,
1138 <complex.h>, <stdio.h>, and <stdlib.h> can be used or exposed.])
1139 fi
1141 gcc_no_link="$ac_save_gcc_no_link"
1142 LIBS="$ac_save_LIBS"
1143 CXXFLAGS="$ac_save_CXXFLAGS"
1144 AC_LANG_RESTORE
1146 AC_LANG_SAVE
1147 AC_LANG_CPLUSPLUS
1149 # Use -std=c++11 and test again for C99 library feature in C++11 mode.
1150 # For the reasons given above we use -std=c++11 not -std=gnu++11.
1151 ac_save_CXXFLAGS="$CXXFLAGS"
1152 CXXFLAGS="$CXXFLAGS -std=c++11"
1153 ac_save_LIBS="$LIBS"
1154 ac_save_gcc_no_link="$gcc_no_link"
1156 if test x$gcc_no_link != xyes; then
1157 # Use -fno-exceptions to that the C driver can link these tests without
1158 # hitting undefined references to personality routines.
1159 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1160 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
1161 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
1162 gcc_no_link=yes
1163 ])
1164 fi
1166 # Check for the existence of <math.h> functions used if C99 is enabled.
1167 AC_MSG_CHECKING([for ISO C99 support in <math.h> for C++11])
1168 AC_CACHE_VAL(glibcxx_cv_c99_math_cxx11, [
1169 GCC_TRY_COMPILE_OR_LINK(
1170 [#include <math.h>
1171 volatile double d1, d2;
1172 volatile int i;],
1173 [i = fpclassify(d1);
1174 i = isfinite(d1);
1175 i = isinf(d1);
1176 i = isnan(d1);
1177 i = isnormal(d1);
1178 i = signbit(d1);
1179 i = isgreater(d1, d2);
1180 i = isgreaterequal(d1, d2);
1181 i = isless(d1, d2);
1182 i = islessequal(d1, d2);
1183 i = islessgreater(d1, d2);
1184 i = islessgreater(d1, d2);
1185 i = isunordered(d1, d2);
1186 ], [glibcxx_cv_c99_math_cxx11=yes], [glibcxx_cv_c99_math_cxx11=no])
1187 ])
1188 AC_MSG_RESULT($glibcxx_cv_c99_math_cxx11)
1189 if test x"$glibcxx_cv_c99_math_cxx11" = x"yes"; then
1190 AC_DEFINE(_GLIBCXX11_USE_C99_MATH, 1,
1191 [Define if C99 functions or macros in <math.h> should be imported
1192 in <cmath> in namespace std for C++11.])
1193 fi
1195 # Check for the existence of <complex.h> complex math functions.
1196 # This is necessary even though libstdc++ uses the builtin versions
1197 # of these functions, because if the builtin cannot be used, a reference
1198 # to the library function is emitted.
1199 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
1200 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1201 if test x"$ac_has_complex_h" = x"yes"; then
1202 AC_MSG_CHECKING([for ISO C99 support in <complex.h> for C++11])
1203 AC_CACHE_VAL(glibcxx_cv_c99_complex_cxx11, [
1204 GCC_TRY_COMPILE_OR_LINK(
1205 [#include <complex.h>
1206 typedef __complex__ float float_type;
1207 typedef __complex__ double double_type;
1208 typedef __complex__ long double ld_type;
1209 volatile float_type tmpf;
1210 volatile double_type tmpd;
1211 volatile ld_type tmpld;
1212 volatile float f;
1213 volatile double d;
1214 volatile long double ld;],
1215 [f = cabsf(tmpf);
1216 f = cargf(tmpf);
1217 tmpf = ccosf(tmpf);
1218 tmpf = ccoshf(tmpf);
1219 tmpf = cexpf(tmpf);
1220 tmpf = clogf(tmpf);
1221 tmpf = csinf(tmpf);
1222 tmpf = csinhf(tmpf);
1223 tmpf = csqrtf(tmpf);
1224 tmpf = ctanf(tmpf);
1225 tmpf = ctanhf(tmpf);
1226 tmpf = cpowf(tmpf, tmpf);
1227 tmpf = cprojf(tmpf);
1228 d = cabs(tmpd);
1229 d = carg(tmpd);
1230 tmpd = ccos(tmpd);
1231 tmpd = ccosh(tmpd);
1232 tmpd = cexp(tmpd);
1233 tmpd = clog(tmpd);
1234 tmpd = csin(tmpd);
1235 tmpd = csinh(tmpd);
1236 tmpd = csqrt(tmpd);
1237 tmpd = ctan(tmpd);
1238 tmpd = ctanh(tmpd);
1239 tmpd = cpow(tmpd, tmpd);
1240 tmpd = cproj(tmpd);
1241 ld = cabsl(tmpld);
1242 ld = cargl(tmpld);
1243 tmpld = ccosl(tmpld);
1244 tmpld = ccoshl(tmpld);
1245 tmpld = cexpl(tmpld);
1246 tmpld = clogl(tmpld);
1247 tmpld = csinl(tmpld);
1248 tmpld = csinhl(tmpld);
1249 tmpld = csqrtl(tmpld);
1250 tmpld = ctanl(tmpld);
1251 tmpld = ctanhl(tmpld);
1252 tmpld = cpowl(tmpld, tmpld);
1253 tmpld = cprojl(tmpld);
1254 ], [glibcxx_cv_c99_complex_cxx11=yes], [glibcxx_cv_c99_complex_cxx11=no])
1255 ])
1256 fi
1257 AC_MSG_RESULT($glibcxx_cv_c99_complex_cxx11)
1258 if test x"$glibcxx_cv_c99_complex_cxx11" = x"yes"; then
1259 AC_DEFINE(_GLIBCXX11_USE_C99_COMPLEX, 1,
1260 [Define if C99 functions in <complex.h> should be used in
1261 <complex> for C++11. Using compiler builtins for these functions
1262 requires corresponding C99 library functions to be present.])
1263 fi
1265 # Check for the existence in <stdio.h> of vscanf, et. al.
1266 AC_MSG_CHECKING([for ISO C99 support in <stdio.h> for C++11])
1267 AC_CACHE_VAL(glibcxx_cv_c99_stdio_cxx11, [
1268 GCC_TRY_COMPILE_OR_LINK(
1269 [#include <stdio.h>
1270 #include <stdarg.h>
1271 void foo(char* fmt, ...)
1272 {
1273 va_list args; va_start(args, fmt);
1274 vfscanf(stderr, "%i", args);
1275 vscanf("%i", args);
1276 vsnprintf(fmt, 0, "%i", args);
1277 vsscanf(fmt, "%i", args);
1278 snprintf(fmt, 0, "%i");
1279 }], [],
1280 [glibcxx_cv_c99_stdio_cxx11=yes], [glibcxx_cv_c99_stdio_cxx11=no])
1281 ])
1282 AC_MSG_RESULT($glibcxx_cv_c99_stdio_cxx11)
1283 if test x"$glibcxx_cv_c99_stdio_cxx11" = x"yes"; then
1284 AC_DEFINE(_GLIBCXX11_USE_C99_STDIO, 1,
1285 [Define if C99 functions or macros in <stdio.h> should be imported
1286 in <cstdio> in namespace std for C++11.])
1287 fi
1289 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
1290 AC_MSG_CHECKING([for ISO C99 support in <stdlib.h> for C++11])
1291 AC_CACHE_VAL(glibcxx_cv_c99_stdlib_cxx11, [
1292 GCC_TRY_COMPILE_OR_LINK(
1293 [#include <stdlib.h>
1294 volatile float f;
1295 volatile long double ld;
1296 volatile unsigned long long ll;
1297 lldiv_t mydivt;],
1298 [char* tmp;
1299 f = strtof("gnu", &tmp);
1300 ld = strtold("gnu", &tmp);
1301 ll = strtoll("gnu", &tmp, 10);
1302 ll = strtoull("gnu", &tmp, 10);
1303 ll = llabs(10);
1304 mydivt = lldiv(10,1);
1305 ll = mydivt.quot;
1306 ll = mydivt.rem;
1307 ll = atoll("10");
1308 _Exit(0);
1309 ], [glibcxx_cv_c99_stdlib_cxx11=yes], [glibcxx_cv_c99_stdlib_cxx11=no])
1310 ])
1311 AC_MSG_RESULT($glibcxx_cv_c99_stdlib_cxx11)
1312 if test x"$glibcxx_cv_c99_stdlib_cxx11" = x"yes"; then
1313 AC_DEFINE(_GLIBCXX11_USE_C99_STDLIB, 1,
1314 [Define if C99 functions or macros in <stdlib.h> should be imported
1315 in <cstdlib> in namespace std for C++11.])
1316 fi
1318 # Check for the existence in <wchar.h> of wcstold, etc.
1319 if test x"$ac_has_wchar_h" = xyes &&
1320 test x"$ac_has_wctype_h" = xyes; then
1321 AC_MSG_CHECKING([for ISO C99 support in <wchar.h> for C++11])
1322 AC_CACHE_VAL(glibcxx_cv_c99_wchar_cxx11, [
1323 AC_TRY_COMPILE([#include <wchar.h>
1324 namespace test
1325 {
1326 using ::wcstold;
1327 using ::wcstoll;
1328 using ::wcstoull;
1329 }
1330 ], [], [glibcxx_cv_c99_wchar_cxx11=yes], [glibcxx_cv_c99_wchar_cxx11=no])
1331 ])
1333 # Checks for wide character functions that may not be present.
1334 # Injection of these is wrapped with guard macros.
1335 # NB: only put functions here, instead of immediately above, if
1336 # absolutely necessary.
1337 AC_TRY_COMPILE([#include <wchar.h>
1338 namespace test { using ::vfwscanf; }], [],
1339 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1341 AC_TRY_COMPILE([#include <wchar.h>
1342 namespace test { using ::vswscanf; }], [],
1343 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1345 AC_TRY_COMPILE([#include <wchar.h>
1346 namespace test { using ::vwscanf; }], [],
1347 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1349 AC_TRY_COMPILE([#include <wchar.h>
1350 namespace test { using ::wcstof; }], [],
1351 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1353 AC_TRY_COMPILE([#include <wctype.h>],
1354 [wint_t t; int i = iswblank(t);],
1355 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1357 AC_MSG_RESULT($glibcxx_cv_c99_wchar_cxx11)
1358 if test x"$glibcxx_cv_c99_wchar_cxx11" = x"yes"; then
1359 AC_DEFINE(_GLIBCXX11_USE_C99_WCHAR, 1,
1360 [Define if C99 functions or macros in <wchar.h> should be imported
1361 in <cwchar> in namespace std for C++11.])
1362 fi
1363 fi
1365 gcc_no_link="$ac_save_gcc_no_link"
1366 LIBS="$ac_save_LIBS"
1367 CXXFLAGS="$ac_save_CXXFLAGS"
1368 AC_LANG_RESTORE
1369 fi
1371 AC_MSG_CHECKING([for fully enabled ISO C99 support])
1372 AC_MSG_RESULT($enable_c99)
1373 ])
1376 dnl
1377 dnl Check for clock_gettime, nanosleep and sched_yield, used in the
1378 dnl implementation of 20.11.7 [time.clock], and 30.3.2 [thread.thread.this]
1379 dnl in the C++11 standard.
1380 dnl
1381 dnl --enable-libstdcxx-time
1382 dnl --enable-libstdcxx-time=yes
1383 dnl checks for the availability of monotonic and realtime clocks,
1384 dnl nanosleep and sched_yield in libc.
1385 dnl --enable-libstdcxx-time=rt
1386 dnl also searches (and, if needed, links) librt. Note that this is
1387 dnl not always desirable because, in glibc 2.16 and earlier, for
1388 dnl example, in turn it triggers the linking of libpthread too,
1389 dnl which activates locking,
1390 dnl a large overhead for single-thread programs.
1391 dnl --enable-libstdcxx-time=no
1392 dnl --disable-libstdcxx-time
1393 dnl disables the checks completely
1394 dnl
1395 dnl N.B. Darwin provides nanosleep but doesn't support the whole POSIX
1396 dnl Timers option, so doesn't define _POSIX_TIMERS. Because the test
1397 dnl below fails Darwin unconditionally defines _GLIBCXX_USE_NANOSLEEP in
1398 dnl os_defines.h and also defines _GLIBCXX_USE_SCHED_YIELD.
1399 dnl
1400 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
1402 GLIBCXX_ENABLE(libstdcxx-time,auto,[[[=KIND]]],
1403 [use KIND for check type],
1404 [permit yes|no|rt])
1406 AC_LANG_SAVE
1407 AC_LANG_CPLUSPLUS
1408 ac_save_CXXFLAGS="$CXXFLAGS"
1409 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1410 ac_save_LIBS="$LIBS"
1412 ac_has_clock_monotonic=no
1413 ac_has_clock_realtime=no
1414 ac_has_nanosleep=no
1415 ac_has_sched_yield=no
1417 if test x"$enable_libstdcxx_time" = x"auto"; then
1419 case "${target_os}" in
1420 cygwin*)
1421 ac_has_nanosleep=yes
1422 ;;
1423 darwin*)
1424 ac_has_nanosleep=yes
1425 ac_has_sched_yield=yes
1426 ;;
1427 # VxWorks has nanosleep as soon as the kernel is configured with
1428 # INCLUDE_POSIX_TIMERS, which is normally/most-often the case.
1429 vxworks*)
1430 ac_has_nanosleep=yes
1431 ;;
1432 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
1433 # Don't use link test for freestanding library, in case gcc_no_link=yes
1434 if test x"$is_hosted" = xyes; then
1435 # Versions of glibc before 2.17 needed -lrt for clock_gettime.
1436 AC_SEARCH_LIBS(clock_gettime, [rt])
1437 if test x"$ac_cv_search_clock_gettime" = x"none required"; then
1438 ac_has_clock_monotonic=yes
1439 ac_has_clock_realtime=yes
1440 fi
1441 fi
1442 ac_has_nanosleep=yes
1443 ac_has_sched_yield=yes
1444 ;;
1445 freebsd*|netbsd*|dragonfly*|rtems*)
1446 ac_has_clock_monotonic=yes
1447 ac_has_clock_realtime=yes
1448 ac_has_nanosleep=yes
1449 ac_has_sched_yield=yes
1450 ;;
1451 openbsd*)
1452 ac_has_clock_monotonic=yes
1453 ac_has_clock_realtime=yes
1454 ac_has_nanosleep=yes
1455 ;;
1456 solaris*)
1457 ac_has_clock_monotonic=yes
1458 ac_has_clock_realtime=yes
1459 ac_has_nanosleep=yes
1460 ac_has_sched_yield=yes
1461 ;;
1462 uclinux*)
1463 ac_has_nanosleep=yes
1464 ac_has_sched_yield=yes
1465 esac
1467 elif test x"$enable_libstdcxx_time" != x"no"; then
1469 if test x"$enable_libstdcxx_time" = x"rt"; then
1470 AC_SEARCH_LIBS(clock_gettime, [rt])
1471 AC_SEARCH_LIBS(nanosleep, [rt])
1472 else
1473 AC_CHECK_FUNC(clock_gettime)
1474 AC_CHECK_FUNC(nanosleep)
1475 fi
1477 case "$ac_cv_search_clock_gettime" in
1478 -l*) GLIBCXX_LIBS=$ac_cv_search_clock_gettime
1479 ;;
1480 esac
1481 case "$ac_cv_search_nanosleep" in
1482 -l*) GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_nanosleep"
1483 ;;
1484 esac
1486 AC_SEARCH_LIBS(sched_yield, [rt])
1488 case "$ac_cv_search_sched_yield" in
1489 -lrt*)
1490 if test x"$enable_libstdcxx_time" = x"rt"; then
1491 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1492 ac_has_sched_yield=yes
1493 fi
1494 ;;
1495 *)
1496 ac_has_sched_yield=yes
1497 ;;
1498 esac
1500 AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
1502 if test x"$ac_has_unistd_h" = x"yes"; then
1503 AC_MSG_CHECKING([for monotonic clock])
1504 AC_TRY_LINK(
1505 [#include <unistd.h>
1506 #include <time.h>
1507 ],
1508 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1509 timespec tp;
1510 #endif
1511 clock_gettime(CLOCK_MONOTONIC, &tp);
1512 ], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
1514 AC_MSG_RESULT($ac_has_clock_monotonic)
1516 AC_MSG_CHECKING([for realtime clock])
1517 AC_TRY_LINK(
1518 [#include <unistd.h>
1519 #include <time.h>
1520 ],
1521 [#if _POSIX_TIMERS > 0
1522 timespec tp;
1523 #endif
1524 clock_gettime(CLOCK_REALTIME, &tp);
1525 ], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
1527 AC_MSG_RESULT($ac_has_clock_realtime)
1529 AC_MSG_CHECKING([for nanosleep])
1530 AC_TRY_LINK(
1531 [#include <unistd.h>
1532 #include <time.h>
1533 ],
1534 [#if _POSIX_TIMERS > 0
1535 timespec tp;
1536 #endif
1537 nanosleep(&tp, 0);
1538 ], [ac_has_nanosleep=yes], [ac_has_nanosleep=no])
1540 AC_MSG_RESULT($ac_has_nanosleep)
1541 fi
1542 fi
1544 if test x"$ac_has_clock_monotonic" != x"yes"; then
1545 case ${target_os} in
1546 linux* | uclinux*)
1547 AC_MSG_CHECKING([for clock_gettime syscall])
1548 AC_TRY_COMPILE(
1549 [#include <unistd.h>
1550 #include <time.h>
1551 #include <sys/syscall.h>
1552 ],
1553 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1554 timespec tp;
1555 #endif
1556 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp);
1557 syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);
1558 ], [ac_has_clock_gettime_syscall=yes], [ac_has_clock_gettime_syscall=no])
1559 AC_MSG_RESULT($ac_has_clock_gettime_syscall)
1560 if test x"$ac_has_clock_gettime_syscall" = x"yes"; then
1561 AC_DEFINE(_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL, 1,
1562 [Defined if clock_gettime syscall has monotonic and realtime clock support. ])
1563 ac_has_clock_monotonic=yes
1564 ac_has_clock_realtime=yes
1565 AC_MSG_CHECKING([for struct timespec that matches syscall])
1566 AC_TRY_COMPILE(
1567 [#include <time.h>
1568 #include <sys/syscall.h>
1569 ],
1570 [#ifdef SYS_clock_gettime64
1571 #if SYS_clock_gettime64 != SYS_clock_gettime
1572 // We need to use SYS_clock_gettime and libc appears to
1573 // also know about the SYS_clock_gettime64 syscall.
1574 // Check that userspace doesn't use time64 version of timespec.
1575 static_assert(sizeof(timespec::tv_sec) == sizeof(long),
1576 "struct timespec must be compatible with SYS_clock_gettime");
1577 #endif
1578 #endif
1579 ],
1580 [ac_timespec_matches_syscall=yes],
1581 [ac_timespec_matches_syscall=no])
1582 AC_MSG_RESULT($ac_timespec_matches_syscall)
1583 if test x"$ac_timespec_matches_syscall" = no; then
1584 AC_MSG_ERROR([struct timespec is not compatible with SYS_clock_gettime, please report a bug to http://gcc.gnu.org/bugzilla])
1585 fi
1586 fi;;
1587 esac
1588 fi
1590 if test x"$ac_has_clock_monotonic" = x"yes"; then
1591 AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
1592 [ Defined if clock_gettime has monotonic clock support. ])
1593 fi
1595 if test x"$ac_has_clock_realtime" = x"yes"; then
1596 AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
1597 [ Defined if clock_gettime has realtime clock support. ])
1598 fi
1600 if test x"$ac_has_sched_yield" = x"yes"; then
1601 AC_DEFINE(_GLIBCXX_USE_SCHED_YIELD, 1,
1602 [ Defined if sched_yield is available. ])
1603 fi
1605 if test x"$ac_has_nanosleep" = x"yes"; then
1606 AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
1607 [ Defined if nanosleep is available. ])
1608 else
1609 AC_MSG_CHECKING([for sleep])
1610 AC_TRY_COMPILE([#include <unistd.h>],
1611 [sleep(1)],
1612 [ac_has_sleep=yes],[ac_has_sleep=no])
1613 if test x"$ac_has_sleep" = x"yes"; then
1614 AC_DEFINE(HAVE_SLEEP,1, [Defined if sleep exists.])
1615 fi
1616 AC_MSG_RESULT($ac_has_sleep)
1617 AC_MSG_CHECKING([for usleep])
1618 AC_TRY_COMPILE([#include <unistd.h>],
1619 [sleep(1);
1620 usleep(100);],
1621 [ac_has_usleep=yes],[ac_has_usleep=no])
1622 if test x"$ac_has_usleep" = x"yes"; then
1623 AC_DEFINE(HAVE_USLEEP,1, [Defined if usleep exists.])
1624 fi
1625 AC_MSG_RESULT($ac_has_usleep)
1626 fi
1628 if test x"$ac_has_nanosleep$ac_has_sleep" = x"nono"; then
1629 ac_no_sleep=yes
1630 AC_MSG_CHECKING([for Sleep])
1631 AC_TRY_COMPILE([#include <windows.h>],
1632 [Sleep(1)],
1633 [ac_has_win32_sleep=yes],[ac_has_win32_sleep=no])
1634 if test x"$ac_has_win32_sleep" = x"yes"; then
1635 AC_DEFINE(HAVE_WIN32_SLEEP,1, [Defined if Sleep exists.])
1636 ac_no_sleep=no
1637 fi
1638 AC_MSG_RESULT($ac_has_win32_sleep)
1639 fi
1641 if test x"$ac_no_sleep" = x"yes"; then
1642 AC_DEFINE(NO_SLEEP,1, [Defined if no way to sleep is available.])
1643 fi
1645 AC_SUBST(GLIBCXX_LIBS)
1647 CXXFLAGS="$ac_save_CXXFLAGS"
1648 LIBS="$ac_save_LIBS"
1649 AC_LANG_RESTORE
1650 ])
1652 dnl
1653 dnl Check for gettimeofday, used in the implementation of 20.11.7
1654 dnl [time.clock] in the C++11 standard.
1655 dnl
1656 AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
1658 AC_MSG_CHECKING([for gettimeofday])
1660 AC_LANG_SAVE
1661 AC_LANG_CPLUSPLUS
1662 ac_save_CXXFLAGS="$CXXFLAGS"
1663 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1665 ac_has_gettimeofday=no;
1666 AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
1667 if test x"$ac_has_sys_time_h" = x"yes"; then
1668 AC_MSG_CHECKING([for gettimeofday])
1669 GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
1670 [timeval tv; gettimeofday(&tv, 0);],
1671 [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
1673 AC_MSG_RESULT($ac_has_gettimeofday)
1674 fi
1676 if test x"$ac_has_gettimeofday" = x"yes"; then
1677 AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
1678 [ Defined if gettimeofday is available. ])
1679 fi
1681 CXXFLAGS="$ac_save_CXXFLAGS"
1682 AC_LANG_RESTORE
1683 ])
1685 dnl
1686 dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
1687 dnl facilities in Chapter 8, "C compatibility".
1688 dnl
1689 AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
1691 AC_LANG_SAVE
1692 AC_LANG_CPLUSPLUS
1694 # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
1695 # undefined and fake C99 facilities may be spuriously enabled.
1696 ac_save_CXXFLAGS="$CXXFLAGS"
1697 CXXFLAGS="$CXXFLAGS -std=c++98"
1699 # Check for the existence of <complex.h> complex math functions used
1700 # by tr1/complex.
1701 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1702 ac_c99_complex_tr1=no;
1703 if test x"$ac_has_complex_h" = x"yes"; then
1704 AC_MSG_CHECKING([for ISO C99 support to TR1 in <complex.h>])
1705 AC_TRY_COMPILE([#include <complex.h>],
1706 [typedef __complex__ float float_type; float_type tmpf;
1707 cacosf(tmpf);
1708 casinf(tmpf);
1709 catanf(tmpf);
1710 cacoshf(tmpf);
1711 casinhf(tmpf);
1712 catanhf(tmpf);
1713 typedef __complex__ double double_type; double_type tmpd;
1714 cacos(tmpd);
1715 casin(tmpd);
1716 catan(tmpd);
1717 cacosh(tmpd);
1718 casinh(tmpd);
1719 catanh(tmpd);
1720 typedef __complex__ long double ld_type; ld_type tmpld;
1721 cacosl(tmpld);
1722 casinl(tmpld);
1723 catanl(tmpld);
1724 cacoshl(tmpld);
1725 casinhl(tmpld);
1726 catanhl(tmpld);
1727 ],[ac_c99_complex_tr1=yes], [ac_c99_complex_tr1=no])
1728 fi
1729 AC_MSG_RESULT($ac_c99_complex_tr1)
1730 if test x"$ac_c99_complex_tr1" = x"yes"; then
1731 AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_TR1, 1,
1732 [Define if C99 functions in <complex.h> should be used in
1733 <tr1/complex>. Using compiler builtins for these functions
1734 requires corresponding C99 library functions to be present.])
1735 fi
1737 # Check for the existence of <ctype.h> functions.
1738 AC_MSG_CHECKING([for ISO C99 support to TR1 in <ctype.h>])
1739 AC_CACHE_VAL(glibcxx_cv_c99_ctype_tr1, [
1740 AC_TRY_COMPILE([#include <ctype.h>],
1741 [int ch;
1742 int ret;
1743 ret = isblank(ch);
1744 ],[glibcxx_cv_c99_ctype_tr1=yes],
1745 [glibcxx_cv_c99_ctype_tr1=no])
1746 ])
1747 AC_MSG_RESULT($glibcxx_cv_c99_ctype_tr1)
1748 if test x"$glibcxx_cv_c99_ctype_tr1" = x"yes"; then
1749 AC_DEFINE(_GLIBCXX_USE_C99_CTYPE_TR1, 1,
1750 [Define if C99 functions in <ctype.h> should be imported in
1751 <tr1/cctype> in namespace std::tr1.])
1752 fi
1754 # Check for the existence of <fenv.h> functions.
1755 AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no)
1756 ac_c99_fenv_tr1=no;
1757 if test x"$ac_has_fenv_h" = x"yes"; then
1758 AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>])
1759 AC_TRY_COMPILE([#include <fenv.h>],
1760 [int except, mode;
1761 fexcept_t* pflag;
1762 fenv_t* penv;
1763 int ret;
1764 ret = feclearexcept(except);
1765 ret = fegetexceptflag(pflag, except);
1766 ret = feraiseexcept(except);
1767 ret = fesetexceptflag(pflag, except);
1768 ret = fetestexcept(except);
1769 ret = fegetround();
1770 ret = fesetround(mode);
1771 ret = fegetenv(penv);
1772 ret = feholdexcept(penv);
1773 ret = fesetenv(penv);
1774 ret = feupdateenv(penv);
1775 ],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no])
1776 fi
1777 AC_MSG_RESULT($ac_c99_fenv_tr1)
1778 if test x"$ac_c99_fenv_tr1" = x"yes"; then
1779 AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1,
1780 [Define if C99 functions in <fenv.h> should be imported in
1781 <tr1/cfenv> in namespace std::tr1.])
1782 fi
1784 # Check for the existence of <stdint.h> types.
1785 AC_MSG_CHECKING([for ISO C99 support to TR1 in <stdint.h>])
1786 AC_CACHE_VAL(glibcxx_cv_c99_stdint_tr1, [
1787 AC_TRY_COMPILE([#define __STDC_LIMIT_MACROS
1788 #define __STDC_CONSTANT_MACROS
1789 #include <stdint.h>],
1790 [typedef int8_t my_int8_t;
1791 my_int8_t i8 = INT8_MIN;
1792 i8 = INT8_MAX;
1793 typedef int16_t my_int16_t;
1794 my_int16_t i16 = INT16_MIN;
1795 i16 = INT16_MAX;
1796 typedef int32_t my_int32_t;
1797 my_int32_t i32 = INT32_MIN;
1798 i32 = INT32_MAX;
1799 typedef int64_t my_int64_t;
1800 my_int64_t i64 = INT64_MIN;
1801 i64 = INT64_MAX;
1802 typedef int_fast8_t my_int_fast8_t;
1803 my_int_fast8_t if8 = INT_FAST8_MIN;
1804 if8 = INT_FAST8_MAX;
1805 typedef int_fast16_t my_int_fast16_t;
1806 my_int_fast16_t if16 = INT_FAST16_MIN;
1807 if16 = INT_FAST16_MAX;
1808 typedef int_fast32_t my_int_fast32_t;
1809 my_int_fast32_t if32 = INT_FAST32_MIN;
1810 if32 = INT_FAST32_MAX;
1811 typedef int_fast64_t my_int_fast64_t;
1812 my_int_fast64_t if64 = INT_FAST64_MIN;
1813 if64 = INT_FAST64_MAX;
1814 typedef int_least8_t my_int_least8_t;
1815 my_int_least8_t il8 = INT_LEAST8_MIN;
1816 il8 = INT_LEAST8_MAX;
1817 typedef int_least16_t my_int_least16_t;
1818 my_int_least16_t il16 = INT_LEAST16_MIN;
1819 il16 = INT_LEAST16_MAX;
1820 typedef int_least32_t my_int_least32_t;
1821 my_int_least32_t il32 = INT_LEAST32_MIN;
1822 il32 = INT_LEAST32_MAX;
1823 typedef int_least64_t my_int_least64_t;
1824 my_int_least64_t il64 = INT_LEAST64_MIN;
1825 il64 = INT_LEAST64_MAX;
1826 typedef intmax_t my_intmax_t;
1827 my_intmax_t im = INTMAX_MAX;
1828 im = INTMAX_MIN;
1829 typedef intptr_t my_intptr_t;
1830 my_intptr_t ip = INTPTR_MAX;
1831 ip = INTPTR_MIN;
1832 typedef uint8_t my_uint8_t;
1833 my_uint8_t ui8 = UINT8_MAX;
1834 ui8 = UINT8_MAX;
1835 typedef uint16_t my_uint16_t;
1836 my_uint16_t ui16 = UINT16_MAX;
1837 ui16 = UINT16_MAX;
1838 typedef uint32_t my_uint32_t;
1839 my_uint32_t ui32 = UINT32_MAX;
1840 ui32 = UINT32_MAX;
1841 typedef uint64_t my_uint64_t;
1842 my_uint64_t ui64 = UINT64_MAX;
1843 ui64 = UINT64_MAX;
1844 typedef uint_fast8_t my_uint_fast8_t;
1845 my_uint_fast8_t uif8 = UINT_FAST8_MAX;
1846 uif8 = UINT_FAST8_MAX;
1847 typedef uint_fast16_t my_uint_fast16_t;
1848 my_uint_fast16_t uif16 = UINT_FAST16_MAX;
1849 uif16 = UINT_FAST16_MAX;
1850 typedef uint_fast32_t my_uint_fast32_t;
1851 my_uint_fast32_t uif32 = UINT_FAST32_MAX;
1852 uif32 = UINT_FAST32_MAX;
1853 typedef uint_fast64_t my_uint_fast64_t;
1854 my_uint_fast64_t uif64 = UINT_FAST64_MAX;
1855 uif64 = UINT_FAST64_MAX;
1856 typedef uint_least8_t my_uint_least8_t;
1857 my_uint_least8_t uil8 = UINT_LEAST8_MAX;
1858 uil8 = UINT_LEAST8_MAX;
1859 typedef uint_least16_t my_uint_least16_t;
1860 my_uint_least16_t uil16 = UINT_LEAST16_MAX;
1861 uil16 = UINT_LEAST16_MAX;
1862 typedef uint_least32_t my_uint_least32_t;
1863 my_uint_least32_t uil32 = UINT_LEAST32_MAX;
1864 uil32 = UINT_LEAST32_MAX;
1865 typedef uint_least64_t my_uint_least64_t;
1866 my_uint_least64_t uil64 = UINT_LEAST64_MAX;
1867 uil64 = UINT_LEAST64_MAX;
1868 typedef uintmax_t my_uintmax_t;
1869 my_uintmax_t uim = UINTMAX_MAX;
1870 uim = UINTMAX_MAX;
1871 typedef uintptr_t my_uintptr_t;
1872 my_uintptr_t uip = UINTPTR_MAX;
1873 uip = UINTPTR_MAX;
1874 ],[glibcxx_cv_c99_stdint_tr1=yes],
1875 [glibcxx_cv_c99_stdint_tr1=no])
1876 ])
1877 AC_MSG_RESULT($glibcxx_cv_c99_stdint_tr1)
1878 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1879 AC_DEFINE(_GLIBCXX_USE_C99_STDINT_TR1, 1,
1880 [Define if C99 types in <stdint.h> should be imported in
1881 <tr1/cstdint> in namespace std::tr1.])
1882 fi
1884 # Check for the existence of <math.h> functions.
1885 AC_MSG_CHECKING([for ISO C99 support to TR1 in <math.h>])
1886 AC_CACHE_VAL(glibcxx_cv_c99_math_tr1, [
1887 AC_TRY_COMPILE([#include <math.h>],
1888 [typedef double_t my_double_t;
1889 typedef float_t my_float_t;
1890 acosh(0.0);
1891 acoshf(0.0f);
1892 acoshl(0.0l);
1893 asinh(0.0);
1894 asinhf(0.0f);
1895 asinhl(0.0l);
1896 atanh(0.0);
1897 atanhf(0.0f);
1898 atanhl(0.0l);
1899 cbrt(0.0);
1900 cbrtf(0.0f);
1901 cbrtl(0.0l);
1902 copysign(0.0, 0.0);
1903 copysignf(0.0f, 0.0f);
1904 copysignl(0.0l, 0.0l);
1905 erf(0.0);
1906 erff(0.0f);
1907 erfl(0.0l);
1908 erfc(0.0);
1909 erfcf(0.0f);
1910 erfcl(0.0l);
1911 exp2(0.0);
1912 exp2f(0.0f);
1913 exp2l(0.0l);
1914 expm1(0.0);
1915 expm1f(0.0f);
1916 expm1l(0.0l);
1917 fdim(0.0, 0.0);
1918 fdimf(0.0f, 0.0f);
1919 fdiml(0.0l, 0.0l);
1920 fma(0.0, 0.0, 0.0);
1921 fmaf(0.0f, 0.0f, 0.0f);
1922 fmal(0.0l, 0.0l, 0.0l);
1923 fmax(0.0, 0.0);
1924 fmaxf(0.0f, 0.0f);
1925 fmaxl(0.0l, 0.0l);
1926 fmin(0.0, 0.0);
1927 fminf(0.0f, 0.0f);
1928 fminl(0.0l, 0.0l);
1929 hypot(0.0, 0.0);
1930 hypotf(0.0f, 0.0f);
1931 hypotl(0.0l, 0.0l);
1932 ilogb(0.0);
1933 ilogbf(0.0f);
1934 ilogbl(0.0l);
1935 lgamma(0.0);
1936 lgammaf(0.0f);
1937 lgammal(0.0l);
1938 #ifndef __APPLE__ /* see below */
1939 llrint(0.0);
1940 llrintf(0.0f);
1941 llrintl(0.0l);
1942 llround(0.0);
1943 llroundf(0.0f);
1944 llroundl(0.0l);
1945 #endif
1946 log1p(0.0);
1947 log1pf(0.0f);
1948 log1pl(0.0l);
1949 log2(0.0);
1950 log2f(0.0f);
1951 log2l(0.0l);
1952 logb(0.0);
1953 logbf(0.0f);
1954 logbl(0.0l);
1955 lrint(0.0);
1956 lrintf(0.0f);
1957 lrintl(0.0l);
1958 lround(0.0);
1959 lroundf(0.0f);
1960 lroundl(0.0l);
1961 nan(0);
1962 nanf(0);
1963 nanl(0);
1964 nearbyint(0.0);
1965 nearbyintf(0.0f);
1966 nearbyintl(0.0l);
1967 nextafter(0.0, 0.0);
1968 nextafterf(0.0f, 0.0f);
1969 nextafterl(0.0l, 0.0l);
1970 nexttoward(0.0, 0.0);
1971 nexttowardf(0.0f, 0.0f);
1972 nexttowardl(0.0l, 0.0l);
1973 remainder(0.0, 0.0);
1974 remainderf(0.0f, 0.0f);
1975 remainderl(0.0l, 0.0l);
1976 remquo(0.0, 0.0, 0);
1977 remquof(0.0f, 0.0f, 0);
1978 remquol(0.0l, 0.0l, 0);
1979 rint(0.0);
1980 rintf(0.0f);
1981 rintl(0.0l);
1982 round(0.0);
1983 roundf(0.0f);
1984 roundl(0.0l);
1985 scalbln(0.0, 0l);
1986 scalblnf(0.0f, 0l);
1987 scalblnl(0.0l, 0l);
1988 scalbn(0.0, 0);
1989 scalbnf(0.0f, 0);
1990 scalbnl(0.0l, 0);
1991 tgamma(0.0);
1992 tgammaf(0.0f);
1993 tgammal(0.0l);
1994 trunc(0.0);
1995 truncf(0.0f);
1996 truncl(0.0l);
1997 ],[glibcxx_cv_c99_math_tr1=yes], [glibcxx_cv_c99_math_tr1=no])
1998 ])
1999 AC_MSG_RESULT($glibcxx_cv_c99_math_tr1)
2000 if test x"$glibcxx_cv_c99_math_tr1" = x"yes"; then
2001 AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
2002 [Define if C99 functions or macros in <math.h> should be imported
2003 in <tr1/cmath> in namespace std::tr1.])
2005 case "${target_os}" in
2006 darwin*)
2007 AC_MSG_CHECKING([for ISO C99 rounding functions in <math.h>])
2008 AC_CACHE_VAL(glibcxx_cv_c99_math_llround, [
2009 AC_TRY_COMPILE([#include <math.h>],
2010 [llrint(0.0);
2011 llrintf(0.0f);
2012 llrintl(0.0l);
2013 llround(0.0);
2014 llroundf(0.0f);
2015 llroundl(0.0l);
2016 ],
2017 [glibcxx_cv_c99_math_llround=yes],
2018 [glibcxx_cv_c99_math_llround=no])
2019 ])
2020 AC_MSG_RESULT($glibcxx_cv_c99_math_llround)
2021 ;;
2022 esac
2023 if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
2024 AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
2025 [Define if C99 llrint and llround functions are missing from <math.h>.])
2026 fi
2027 fi
2029 # Check for the existence of <inttypes.h> functions (NB: doesn't make
2030 # sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
2031 ac_c99_inttypes_tr1=no;
2032 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
2033 AC_MSG_CHECKING([for ISO C99 support to TR1 in <inttypes.h>])
2034 AC_TRY_COMPILE([#include <inttypes.h>],
2035 [intmax_t i, numer, denom, base;
2036 const char* s;
2037 char** endptr;
2038 intmax_t ret = imaxabs(i);
2039 imaxdiv_t dret = imaxdiv(numer, denom);
2040 ret = strtoimax(s, endptr, base);
2041 uintmax_t uret = strtoumax(s, endptr, base);
2042 ],[ac_c99_inttypes_tr1=yes], [ac_c99_inttypes_tr1=no])
2043 fi
2044 AC_MSG_RESULT($ac_c99_inttypes_tr1)
2045 if test x"$ac_c99_inttypes_tr1" = x"yes"; then
2046 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_TR1, 1,
2047 [Define if C99 functions in <inttypes.h> should be imported in
2048 <tr1/cinttypes> in namespace std::tr1.])
2049 fi
2051 # Check for the existence of wchar_t <inttypes.h> functions (NB: doesn't
2052 # make sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
2053 ac_c99_inttypes_wchar_t_tr1=no;
2054 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
2055 AC_MSG_CHECKING([for wchar_t ISO C99 support to TR1 in <inttypes.h>])
2056 AC_TRY_COMPILE([#include <inttypes.h>],
2057 [intmax_t base;
2058 const wchar_t* s;
2059 wchar_t** endptr;
2060 intmax_t ret = wcstoimax(s, endptr, base);
2061 uintmax_t uret = wcstoumax(s, endptr, base);
2062 ],[ac_c99_inttypes_wchar_t_tr1=yes],
2063 [ac_c99_inttypes_wchar_t_tr1=no])
2064 fi
2065 AC_MSG_RESULT($ac_c99_inttypes_wchar_t_tr1)
2066 if test x"$ac_c99_inttypes_wchar_t_tr1" = x"yes"; then
2067 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1, 1,
2068 [Define if wchar_t C99 functions in <inttypes.h> should be
2069 imported in <tr1/cinttypes> in namespace std::tr1.])
2070 fi
2072 # Check for the existence of the <stdbool.h> header.
2073 AC_CHECK_HEADERS(stdbool.h)
2075 # Check for the existence of the <stdalign.h> header.
2076 AC_CHECK_HEADERS(stdalign.h)
2078 CXXFLAGS="$ac_save_CXXFLAGS"
2079 AC_LANG_RESTORE
2080 ])
2082 dnl
2083 dnl Check for uchar.h and usability.
2084 dnl
2085 AC_DEFUN([GLIBCXX_CHECK_UCHAR_H], [
2087 # Test uchar.h.
2088 AC_CHECK_HEADERS(uchar.h, ac_has_uchar_h=yes, ac_has_uchar_h=no)
2090 AC_LANG_SAVE
2091 AC_LANG_CPLUSPLUS
2092 ac_save_CXXFLAGS="$CXXFLAGS"
2093 CXXFLAGS="$CXXFLAGS -std=c++11"
2095 if test x"$ac_has_uchar_h" = x"yes"; then
2096 AC_MSG_CHECKING([for ISO C11 support for <uchar.h>])
2097 AC_TRY_COMPILE([#include <uchar.h>
2098 #ifdef __STDC_UTF_16__
2099 long i = __STDC_UTF_16__;
2100 #endif
2101 #ifdef __STDC_UTF_32__
2102 long j = __STDC_UTF_32__;
2103 #endif
2104 namespace test
2105 {
2106 using ::c16rtomb;
2107 using ::c32rtomb;
2108 using ::mbrtoc16;
2109 using ::mbrtoc32;
2110 }
2111 ],
2112 [], [ac_c11_uchar_cxx11=yes], [ac_c11_uchar_cxx11=no])
2113 else
2114 ac_c11_uchar_cxx11=no
2115 fi
2116 AC_MSG_RESULT($ac_c11_uchar_cxx11)
2117 if test x"$ac_c11_uchar_cxx11" = x"yes"; then
2118 AC_DEFINE(_GLIBCXX_USE_C11_UCHAR_CXX11, 1,
2119 [Define if C11 functions in <uchar.h> should be imported into
2120 namespace std in <cuchar>.])
2121 fi
2123 CXXFLAGS="$ac_save_CXXFLAGS"
2124 AC_LANG_RESTORE
2125 ])
2128 dnl
2129 dnl Check whether "/dev/random" and "/dev/urandom" are available for
2130 dnl class std::random_device from C++ 2011 [rand.device], and
2131 dnl random_device of "TR1" (Chapter 5.1, "Random number generation").
2132 dnl
2133 AC_DEFUN([GLIBCXX_CHECK_DEV_RANDOM], [
2135 AC_MSG_CHECKING([for "/dev/random" and "/dev/urandom" for std::random_device])
2136 AC_CACHE_VAL(glibcxx_cv_dev_random, [
2137 if test -r /dev/random && test -r /dev/urandom; then
2138 ## For MSys environment the test above is detected as false-positive
2139 ## on mingw-targets. So disable it explicitly for them.
2140 case ${target_os} in
2141 *mingw*) glibcxx_cv_dev_random=no ;;
2142 *) glibcxx_cv_dev_random=yes ;;
2143 esac
2144 else
2145 glibcxx_cv_dev_random=no;
2146 fi
2147 ])
2148 AC_MSG_RESULT($glibcxx_cv_dev_random)
2150 if test x"$glibcxx_cv_dev_random" = x"yes"; then
2151 AC_DEFINE(_GLIBCXX_USE_DEV_RANDOM, 1,
2152 [Define if /dev/random and /dev/urandom are available for
2153 std::random_device.])
2154 AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1, 1,
2155 [Define if /dev/random and /dev/urandom are available for
2156 the random_device of TR1 (Chapter 5.1).])
2157 fi
2159 ])
2161 dnl
2162 dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
2163 dnl
2164 AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
2166 AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
2167 AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
2168 [#include <stdio.h>],
2169 [AC_MSG_ERROR([computing EOF failed])])
2170 ])
2171 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_EOF, $glibcxx_cv_stdio_eof,
2172 [Define to the value of the EOF integer constant.])
2174 AC_CACHE_CHECK([for the value of SEEK_CUR], glibcxx_cv_stdio_seek_cur, [
2175 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_cur], [[SEEK_CUR]],
2176 [#include <stdio.h>],
2177 [AC_MSG_ERROR([computing SEEK_CUR failed])])
2178 ])
2179 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_CUR, $glibcxx_cv_stdio_seek_cur,
2180 [Define to the value of the SEEK_CUR integer constant.])
2182 AC_CACHE_CHECK([for the value of SEEK_END], glibcxx_cv_stdio_seek_end, [
2183 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_end], [[SEEK_END]],
2184 [#include <stdio.h>],
2185 [AC_MSG_ERROR([computing SEEK_END failed])])
2186 ])
2187 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
2188 [Define to the value of the SEEK_END integer constant.])
2189 ])
2191 dnl
2192 dnl Check whether required C++ overloads are present in <stdio.h>.
2193 dnl
2194 AC_DEFUN([GLIBCXX_CHECK_STDIO_PROTO], [
2196 AC_LANG_SAVE
2197 AC_LANG_CPLUSPLUS
2198 # Use C++11 because a conforming <stdio.h> won't define gets for C++14,
2199 # and we don't need a declaration for C++14 anyway.
2200 ac_save_CXXFLAGS="$CXXFLAGS"
2201 CXXFLAGS="$CXXFLAGS -std=gnu++11"
2203 AC_MSG_CHECKING([for gets declaration])
2204 AC_CACHE_VAL(glibcxx_cv_gets, [
2205 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2206 [#include <stdio.h>
2207 namespace test
2208 {
2209 using ::gets;
2210 }
2211 ])],
2212 [glibcxx_cv_gets=yes],
2213 [glibcxx_cv_gets=no]
2214 )])
2216 if test $glibcxx_cv_gets = yes; then
2217 AC_DEFINE(HAVE_GETS, 1, [Define if gets is available in <stdio.h> before C++14.])
2218 fi
2219 AC_MSG_RESULT($glibcxx_cv_gets)
2221 CXXFLAGS="$ac_save_CXXFLAGS"
2222 AC_LANG_RESTORE
2223 ])
2225 dnl
2226 dnl Check whether required C++11 overloads for floating point and integral
2227 dnl types are present in <math.h>.
2228 dnl
2229 AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
2231 AC_LANG_SAVE
2232 AC_LANG_CPLUSPLUS
2233 ac_save_CXXFLAGS="$CXXFLAGS"
2234 CXXFLAGS="$CXXFLAGS -std=c++11"
2236 case "$host" in
2237 *-*-solaris2.*)
2238 # Solaris 12 Build 86, Solaris 11.3 SRU 3.6, and Solaris 10 Patch
2239 # 11996[67]-02 introduced the C++11 <math.h> floating point overloads.
2240 AC_MSG_CHECKING([for C++11 <math.h> floating point overloads])
2241 AC_CACHE_VAL(glibcxx_cv_math11_fp_overload, [
2242 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2243 [#include <math.h>
2244 #undef isfinite
2245 namespace std {
2246 inline bool isfinite(float __x)
2247 { return __builtin_isfinite(__x); }
2248 }
2249 ])],
2250 [glibcxx_cv_math11_fp_overload=no],
2251 [glibcxx_cv_math11_fp_overload=yes]
2252 )])
2254 # autoheader cannot handle indented templates.
2255 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_FP],
2256 [/* Define if all C++11 floating point overloads are available in <math.h>. */
2257 #if __cplusplus >= 201103L
2258 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
2259 #endif])
2261 if test $glibcxx_cv_math11_fp_overload = yes; then
2262 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_FP)
2263 fi
2264 AC_MSG_RESULT([$glibcxx_cv_math11_fp_overload])
2266 # Solaris 12 Build 90, Solaris 11.3 SRU 5.6, and Solaris 10 Patch
2267 # 11996[67]-02 introduced the C++11 <math.h> integral type overloads.
2268 AC_MSG_CHECKING([for C++11 <math.h> integral type overloads])
2269 AC_CACHE_VAL(glibcxx_cv_math11_int_overload, [
2270 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2271 [#include <math.h>
2272 namespace std {
2273 template<typename _Tp>
2274 struct __is_integer;
2275 template<>
2276 struct __is_integer<int>
2277 {
2278 enum { __value = 1 };
2279 };
2280 }
2281 namespace __gnu_cxx {
2282 template<bool, typename>
2283 struct __enable_if;
2284 template<typename _Tp>
2285 struct __enable_if<true, _Tp>
2286 { typedef _Tp __type; };
2287 }
2288 namespace std {
2289 template<typename _Tp>
2290 constexpr typename __gnu_cxx::__enable_if
2291 <__is_integer<_Tp>::__value, double>::__type
2292 log2(_Tp __x)
2293 { return __builtin_log2(__x); }
2294 }
2295 int
2296 main (void)
2297 {
2298 int i = 1000;
2299 return std::log2(i);
2300 }
2301 ])],
2302 [glibcxx_cv_math11_int_overload=no],
2303 [glibcxx_cv_math11_int_overload=yes]
2304 )])
2306 # autoheader cannot handle indented templates.
2307 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_INT],
2308 [/* Define if all C++11 integral type overloads are available in <math.h>. */
2309 #if __cplusplus >= 201103L
2310 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
2311 #endif])
2313 if test $glibcxx_cv_math11_int_overload = yes; then
2314 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_INT)
2315 fi
2316 AC_MSG_RESULT([$glibcxx_cv_math11_int_overload])
2317 ;;
2318 *)
2319 # If <math.h> defines the obsolete isinf(double) and isnan(double)
2320 # functions (instead of or as well as the C99 generic macros) then we
2321 # can't define std::isinf(double) and std::isnan(double) in <cmath>
2322 # and must use the ones from <math.h> instead.
2323 AC_MSG_CHECKING([for obsolete isinf function in <math.h>])
2324 AC_CACHE_VAL(glibcxx_cv_obsolete_isinf, [
2325 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2326 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2327 #include <math.h>
2328 #undef isinf
2329 namespace std {
2330 using ::isinf;
2331 bool isinf(float);
2332 bool isinf(long double);
2333 }
2334 using std::isinf;
2335 bool b = isinf(0.0);
2336 ])],
2337 [glibcxx_cv_obsolete_isinf=yes],
2338 [glibcxx_cv_obsolete_isinf=no]
2339 )])
2340 AC_MSG_RESULT([$glibcxx_cv_obsolete_isinf])
2341 if test $glibcxx_cv_obsolete_isinf = yes; then
2342 AC_DEFINE(HAVE_OBSOLETE_ISINF, 1,
2343 [Define if <math.h> defines obsolete isinf function.])
2344 fi
2346 AC_MSG_CHECKING([for obsolete isnan function in <math.h>])
2347 AC_CACHE_VAL(glibcxx_cv_obsolete_isnan, [
2348 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2349 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2350 #include <math.h>
2351 #undef isnan
2352 namespace std {
2353 using ::isnan;
2354 bool isnan(float);
2355 bool isnan(long double);
2356 }
2357 using std::isnan;
2358 bool b = isnan(0.0);
2359 ])],
2360 [glibcxx_cv_obsolete_isnan=yes],
2361 [glibcxx_cv_obsolete_isnan=no]
2362 )])
2363 AC_MSG_RESULT([$glibcxx_cv_obsolete_isnan])
2364 if test $glibcxx_cv_obsolete_isnan = yes; then
2365 AC_DEFINE(HAVE_OBSOLETE_ISNAN, 1,
2366 [Define if <math.h> defines obsolete isnan function.])
2367 fi
2368 ;;
2369 esac
2371 CXXFLAGS="$ac_save_CXXFLAGS"
2372 AC_LANG_RESTORE
2373 ])
2375 dnl
2376 dnl Check for what type of C headers to use.
2377 dnl
2378 dnl --enable-cheaders= [does stuff].
2379 dnl --disable-cheaders [does not do anything, really].
2380 dnl + Usage: GLIBCXX_ENABLE_CHEADERS[(DEFAULT)]
2381 dnl Where DEFAULT is either 'c' or 'c_global' or 'c_std'.
2382 dnl
2383 dnl To use the obsolete 'c_std' headers use --enable-cheaders-obsolete as
2384 dnl well as --enable-cheaders=c_std, otherwise configure will fail.
2385 dnl
2386 AC_DEFUN([GLIBCXX_ENABLE_CHEADERS], [
2387 GLIBCXX_ENABLE(cheaders-obsolete,no,,
2388 [allow use of obsolete "C" headers for g++])
2389 GLIBCXX_ENABLE(cheaders,$1,[[[=KIND]]],
2390 [construct "C" headers for g++], [permit c|c_global|c_std])
2391 AC_MSG_NOTICE("C" header strategy set to $enable_cheaders)
2392 if test $enable_cheaders = c_std ; then
2393 AC_MSG_WARN([the --enable-cheaders=c_std configuration is obsolete, c_global should be used instead])
2394 AC_MSG_WARN([if you are unable to use c_global please report a bug or inform libstdc++@gcc.gnu.org])
2395 if test $enable_cheaders_obsolete != yes ; then
2396 AC_MSG_ERROR(use --enable-cheaders-obsolete to use c_std "C" headers)
2397 fi
2398 fi
2400 C_INCLUDE_DIR='${glibcxx_srcdir}/include/'$enable_cheaders
2402 # Allow overrides to configure.host here.
2403 if test $enable_cheaders = c_global; then
2404 c_compatibility=yes
2405 fi
2407 AC_SUBST(C_INCLUDE_DIR)
2408 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C, test $enable_cheaders = c)
2409 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_STD, test $enable_cheaders = c_std)
2410 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_GLOBAL, test $enable_cheaders = c_global)
2411 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_COMPATIBILITY, test $c_compatibility = yes)
2412 ])
2415 dnl
2416 dnl Check for which locale library to use. The choice is mapped to
2417 dnl a subdirectory of config/locale.
2418 dnl
2419 dnl Default is generic.
2420 dnl
2421 AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
2422 GLIBCXX_ENABLE(clocale,auto,[[[=MODEL]]],
2423 [use MODEL for target locale package],
2424 [permit generic|gnu|ieee_1003.1-2001|newlib|yes|no|auto])
2426 # Deal with gettext issues. Default to not using it (=no) until we detect
2427 # support for it later. Let the user turn it off via --e/d, but let that
2428 # default to on for easier handling.
2429 USE_NLS=no
2430 AC_ARG_ENABLE(nls,
2431 AC_HELP_STRING([--enable-nls],[use Native Language Support (default)]),
2432 [],
2433 [enable_nls=yes])
2435 # Either a known package, or "auto"
2436 if test $enable_clocale = no || test $enable_clocale = yes; then
2437 enable_clocale=auto
2438 fi
2439 enable_clocale_flag=$enable_clocale
2441 # Probe for locale model to use if none specified.
2442 # Default to "generic".
2443 if test $enable_clocale_flag = auto; then
2444 case ${target_os} in
2445 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2446 enable_clocale_flag=gnu
2447 ;;
2448 darwin*)
2449 enable_clocale_flag=darwin
2450 ;;
2451 dragonfly* | freebsd*)
2452 enable_clocale_flag=dragonfly
2453 ;;
2454 openbsd*)
2455 enable_clocale_flag=newlib
2456 ;;
2457 *)
2458 if test x"$with_newlib" = x"yes"; then
2459 enable_clocale_flag=newlib
2460 else
2461 enable_clocale_flag=generic
2462 fi
2463 ;;
2464 esac
2465 fi
2467 # Sanity check model, and test for special functionality.
2468 if test $enable_clocale_flag = gnu; then
2469 AC_EGREP_CPP([_GLIBCXX_ok], [
2470 #include <features.h>
2471 #if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined(__UCLIBC__)
2472 _GLIBCXX_ok
2473 #endif
2474 ], enable_clocale_flag=gnu, enable_clocale_flag=generic)
2476 # Set it to scream when it hurts.
2477 ac_save_CFLAGS="$CFLAGS"
2478 CFLAGS="-Wimplicit-function-declaration -Werror"
2480 # Use strxfrm_l if available.
2481 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2482 #include <string.h>
2483 #include <locale.h>],
2484 [char s[128]; __locale_t loc; strxfrm_l(s, "C", 5, loc);],
2485 AC_DEFINE(HAVE_STRXFRM_L, 1,
2486 [Define if strxfrm_l is available in <string.h>.]),)
2488 # Use strerror_l if available.
2489 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2490 #include <string.h>
2491 #include <locale.h>],
2492 [__locale_t loc; strerror_l(5, loc);],
2493 AC_DEFINE(HAVE_STRERROR_L, 1,
2494 [Define if strerror_l is available in <string.h>.]),)
2496 CFLAGS="$ac_save_CFLAGS"
2497 fi
2499 # Perhaps use strerror_r if available, and strerror_l isn't.
2500 ac_save_CFLAGS="$CFLAGS"
2501 CFLAGS="-Wimplicit-function-declaration -Werror"
2502 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2503 #include <string.h>
2504 #include <locale.h>],
2505 [char s[128]; strerror_r(5, s, 128);],
2506 AC_DEFINE(HAVE_STRERROR_R, 1,
2507 [Define if strerror_r is available in <string.h>.]),)
2508 CFLAGS="$ac_save_CFLAGS"
2510 # Set configure bits for specified locale package
2511 AC_MSG_CHECKING([for C locale to use])
2512 case ${enable_clocale_flag} in
2513 generic)
2514 AC_MSG_RESULT(generic)
2516 CLOCALE_H=config/locale/generic/c_locale.h
2517 CLOCALE_CC=config/locale/generic/c_locale.cc
2518 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2519 CCOLLATE_CC=config/locale/generic/collate_members.cc
2520 CCTYPE_CC=config/locale/generic/ctype_members.cc
2521 CMESSAGES_H=config/locale/generic/messages_members.h
2522 CMESSAGES_CC=config/locale/generic/messages_members.cc
2523 CMONEY_CC=config/locale/generic/monetary_members.cc
2524 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2525 CTIME_H=config/locale/generic/time_members.h
2526 CTIME_CC=config/locale/generic/time_members.cc
2527 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2528 ;;
2529 darwin)
2530 AC_MSG_RESULT(darwin)
2532 CLOCALE_H=config/locale/generic/c_locale.h
2533 CLOCALE_CC=config/locale/generic/c_locale.cc
2534 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2535 CCOLLATE_CC=config/locale/generic/collate_members.cc
2536 CCTYPE_CC=config/locale/darwin/ctype_members.cc
2537 CMESSAGES_H=config/locale/generic/messages_members.h
2538 CMESSAGES_CC=config/locale/generic/messages_members.cc
2539 CMONEY_CC=config/locale/generic/monetary_members.cc
2540 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2541 CTIME_H=config/locale/generic/time_members.h
2542 CTIME_CC=config/locale/generic/time_members.cc
2543 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2544 ;;
2546 dragonfly)
2547 AC_MSG_RESULT(dragonfly or freebsd)
2549 CLOCALE_H=config/locale/dragonfly/c_locale.h
2550 CLOCALE_CC=config/locale/dragonfly/c_locale.cc
2551 CCODECVT_CC=config/locale/dragonfly/codecvt_members.cc
2552 CCOLLATE_CC=config/locale/dragonfly/collate_members.cc
2553 CCTYPE_CC=config/locale/dragonfly/ctype_members.cc
2554 CMESSAGES_H=config/locale/generic/messages_members.h
2555 CMESSAGES_CC=config/locale/generic/messages_members.cc
2556 CMONEY_CC=config/locale/dragonfly/monetary_members.cc
2557 CNUMERIC_CC=config/locale/dragonfly/numeric_members.cc
2558 CTIME_H=config/locale/dragonfly/time_members.h
2559 CTIME_CC=config/locale/dragonfly/time_members.cc
2560 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2561 ;;
2563 gnu)
2564 AC_MSG_RESULT(gnu)
2566 # Declare intention to use gettext, and add support for specific
2567 # languages.
2568 # For some reason, ALL_LINGUAS has to be before AM-GNU-GETTEXT
2569 ALL_LINGUAS="de fr"
2571 # Don't call AM-GNU-GETTEXT here. Instead, assume glibc.
2572 AC_CHECK_PROG(check_msgfmt, msgfmt, yes, no)
2573 if test x"$check_msgfmt" = x"yes" && test x"$enable_nls" = x"yes"; then
2574 USE_NLS=yes
2575 fi
2576 # Export the build objects.
2577 for ling in $ALL_LINGUAS; do \
2578 glibcxx_MOFILES="$glibcxx_MOFILES $ling.mo"; \
2579 glibcxx_POFILES="$glibcxx_POFILES $ling.po"; \
2580 done
2581 AC_SUBST(glibcxx_MOFILES)
2582 AC_SUBST(glibcxx_POFILES)
2584 CLOCALE_H=config/locale/gnu/c_locale.h
2585 CLOCALE_CC=config/locale/gnu/c_locale.cc
2586 CCODECVT_CC=config/locale/gnu/codecvt_members.cc
2587 CCOLLATE_CC=config/locale/gnu/collate_members.cc
2588 CCTYPE_CC=config/locale/gnu/ctype_members.cc
2589 CMESSAGES_H=config/locale/gnu/messages_members.h
2590 CMESSAGES_CC=config/locale/gnu/messages_members.cc
2591 CMONEY_CC=config/locale/gnu/monetary_members.cc
2592 CNUMERIC_CC=config/locale/gnu/numeric_members.cc
2593 CTIME_H=config/locale/gnu/time_members.h
2594 CTIME_CC=config/locale/gnu/time_members.cc
2595 CLOCALE_INTERNAL_H=config/locale/gnu/c++locale_internal.h
2596 ;;
2597 ieee_1003.1-2001)
2598 AC_MSG_RESULT(IEEE 1003.1)
2600 CLOCALE_H=config/locale/ieee_1003.1-2001/c_locale.h
2601 CLOCALE_CC=config/locale/ieee_1003.1-2001/c_locale.cc
2602 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2603 CCOLLATE_CC=config/locale/generic/collate_members.cc
2604 CCTYPE_CC=config/locale/generic/ctype_members.cc
2605 CMESSAGES_H=config/locale/ieee_1003.1-2001/messages_members.h
2606 CMESSAGES_CC=config/locale/ieee_1003.1-2001/messages_members.cc
2607 CMONEY_CC=config/locale/generic/monetary_members.cc
2608 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2609 CTIME_H=config/locale/generic/time_members.h
2610 CTIME_CC=config/locale/generic/time_members.cc
2611 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2612 ;;
2613 newlib)
2614 AC_MSG_RESULT(newlib)
2616 CLOCALE_H=config/locale/generic/c_locale.h
2617 CLOCALE_CC=config/locale/generic/c_locale.cc
2618 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2619 CCOLLATE_CC=config/locale/generic/collate_members.cc
2620 CCTYPE_CC=config/locale/newlib/ctype_members.cc
2621 CMESSAGES_H=config/locale/generic/messages_members.h
2622 CMESSAGES_CC=config/locale/generic/messages_members.cc
2623 CMONEY_CC=config/locale/generic/monetary_members.cc
2624 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2625 CTIME_H=config/locale/generic/time_members.h
2626 CTIME_CC=config/locale/generic/time_members.cc
2627 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2628 ;;
2629 esac
2631 # This is where the testsuite looks for locale catalogs, using the
2632 # -DLOCALEDIR define during testsuite compilation.
2633 glibcxx_localedir=${glibcxx_builddir}/po/share/locale
2634 AC_SUBST(glibcxx_localedir)
2636 # A standalone libintl (e.g., GNU libintl) may be in use.
2637 if test $USE_NLS = yes; then
2638 AC_CHECK_HEADERS([libintl.h], [], USE_NLS=no)
2639 AC_SEARCH_LIBS(gettext, intl, [], USE_NLS=no)
2640 fi
2641 if test $USE_NLS = yes; then
2642 AC_DEFINE(_GLIBCXX_USE_NLS, 1,
2643 [Define if NLS translations are to be used.])
2644 fi
2646 AC_SUBST(USE_NLS)
2647 AC_SUBST(CLOCALE_H)
2648 AC_SUBST(CMESSAGES_H)
2649 AC_SUBST(CCODECVT_CC)
2650 AC_SUBST(CCOLLATE_CC)
2651 AC_SUBST(CCTYPE_CC)
2652 AC_SUBST(CMESSAGES_CC)
2653 AC_SUBST(CMONEY_CC)
2654 AC_SUBST(CNUMERIC_CC)
2655 AC_SUBST(CTIME_H)
2656 AC_SUBST(CTIME_CC)
2657 AC_SUBST(CLOCALE_CC)
2658 AC_SUBST(CLOCALE_INTERNAL_H)
2659 ])
2662 dnl
2663 dnl Check for which std::allocator base class to use. The choice is
2664 dnl mapped from a subdirectory of include/ext.
2665 dnl
2666 dnl Default is new.
2667 dnl
2668 AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
2669 AC_MSG_CHECKING([for std::allocator base class])
2670 GLIBCXX_ENABLE(libstdcxx-allocator,auto,[[[=KIND]]],
2671 [use KIND for target std::allocator base],
2672 [permit new|malloc|mt|bitmap|pool|yes|no|auto])
2674 # If they didn't use this option switch, or if they specified --enable
2675 # with no specific model, we'll have to look for one. If they
2676 # specified --disable (???), do likewise.
2677 if test $enable_libstdcxx_allocator = no ||
2678 test $enable_libstdcxx_allocator = yes;
2679 then
2680 enable_libstdcxx_allocator=auto
2681 fi
2683 # Either a known package, or "auto". Auto implies the default choice
2684 # for a particular platform.
2685 enable_libstdcxx_allocator_flag=$enable_libstdcxx_allocator
2687 # Probe for host-specific support if no specific model is specified.
2688 # Default to "new".
2689 if test $enable_libstdcxx_allocator_flag = auto; then
2690 case ${target_os} in
2691 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2692 enable_libstdcxx_allocator_flag=new
2693 ;;
2694 *)
2695 enable_libstdcxx_allocator_flag=new
2696 ;;
2697 esac
2698 fi
2699 AC_MSG_RESULT($enable_libstdcxx_allocator_flag)
2702 # Set configure bits for specified locale package
2703 case ${enable_libstdcxx_allocator_flag} in
2704 bitmap)
2705 ALLOCATOR_H=config/allocator/bitmap_allocator_base.h
2706 ALLOCATOR_NAME=__gnu_cxx::bitmap_allocator
2707 ;;
2708 malloc)
2709 ALLOCATOR_H=config/allocator/malloc_allocator_base.h
2710 ALLOCATOR_NAME=__gnu_cxx::malloc_allocator
2711 ;;
2712 mt)
2713 ALLOCATOR_H=config/allocator/mt_allocator_base.h
2714 ALLOCATOR_NAME=__gnu_cxx::__mt_alloc
2715 ;;
2716 new)
2717 ALLOCATOR_H=config/allocator/new_allocator_base.h
2718 ALLOCATOR_NAME=__gnu_cxx::new_allocator
2719 ;;
2720 pool)
2721 ALLOCATOR_H=config/allocator/pool_allocator_base.h
2722 ALLOCATOR_NAME=__gnu_cxx::__pool_alloc
2723 ;;
2724 esac
2726 GLIBCXX_CONDITIONAL(ENABLE_ALLOCATOR_NEW,
2727 test $enable_libstdcxx_allocator_flag = new)
2728 AC_SUBST(ALLOCATOR_H)
2729 AC_SUBST(ALLOCATOR_NAME)
2730 ])
2733 dnl
2734 dnl Check for whether the Boost-derived checks should be turned on.
2735 dnl
2736 dnl --enable-concept-checks turns them on.
2737 dnl --disable-concept-checks leaves them off.
2738 dnl + Usage: GLIBCXX_ENABLE_CONCEPT_CHECKS[(DEFAULT)]
2739 dnl Where DEFAULT is either `yes' or `no'.
2740 dnl
2741 AC_DEFUN([GLIBCXX_ENABLE_CONCEPT_CHECKS], [
2742 GLIBCXX_ENABLE(concept-checks,$1,,[use Boost-derived template checks])
2743 if test $enable_concept_checks = yes; then
2744 AC_DEFINE(_GLIBCXX_CONCEPT_CHECKS, 1,
2745 [Define to use concept checking code from the boost libraries.])
2746 fi
2747 ])
2749 dnl
2750 dnl Use extern templates.
2751 dnl
2752 dnl --enable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 1
2753 dnl --disable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 0
2755 dnl + Usage: GLIBCXX_ENABLE_TEMPLATE[(DEFAULT)]
2756 dnl Where DEFAULT is `yes' or `no'.
2757 dnl
2758 AC_DEFUN([GLIBCXX_ENABLE_EXTERN_TEMPLATE], [
2760 GLIBCXX_ENABLE(extern-template,$1,,[enable extern template])
2762 AC_MSG_CHECKING([for extern template support])
2763 AC_MSG_RESULT([$enable_extern_template])
2765 GLIBCXX_CONDITIONAL(ENABLE_EXTERN_TEMPLATE, test $enable_extern_template = yes)
2766 ])
2768 dnl
2769 dnl Use vtable verification.
2770 dnl
2771 dnl --enable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 1
2772 dnl --disable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 0
2774 dnl + Usage: GLIBCXX_ENABLE_VTABLE_VERIFY[(DEFAULT)]
2775 dnl Where DEFAULT is `yes' or `no'.
2776 dnl
2777 AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY], [
2779 GLIBCXX_ENABLE(vtable-verify,$1,,[enable vtable verify])
2781 AC_MSG_CHECKING([for vtable verify support])
2782 AC_MSG_RESULT([$enable_vtable_verify])
2784 vtv_cygmin=no
2785 if test $enable_vtable_verify = yes; then
2786 case ${target_os} in
2787 cygwin*|mingw32*)
2788 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2789 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2790 vtv_cygmin=yes
2791 ;;
2792 darwin*)
2793 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u,_vtable_map_vars_start -Wl,-u,_vtable_map_vars_end"
2794 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-rpath,${toplevel_builddir}/libvtv/.libs"
2795 ;;
2796 solaris2*)
2797 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2798 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-R -Wl,${toplevel_builddir}/libvtv/.libs"
2799 ;;
2800 *)
2801 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2802 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2803 ;;
2804 esac
2805 VTV_PCH_CXXFLAGS="-fvtable-verify=std"
2806 else
2807 VTV_CXXFLAGS=
2808 VTV_PCH_CXXFLAGS=
2809 VTV_CXXLINKFLAGS=
2810 fi
2812 AC_SUBST(VTV_CXXFLAGS)
2813 AC_SUBST(VTV_PCH_CXXFLAGS)
2814 AC_SUBST(VTV_CXXLINKFLAGS)
2815 AM_CONDITIONAL(VTV_CYGMIN, test x$vtv_cygmin = xyes)
2816 GLIBCXX_CONDITIONAL(ENABLE_VTABLE_VERIFY, test $enable_vtable_verify = yes)
2817 ])
2819 dnl
2820 dnl Check for parallel mode pre-requisites, including OpenMP support.
2821 dnl
2822 dnl + Usage: GLIBCXX_ENABLE_PARALLEL
2823 dnl
2824 AC_DEFUN([GLIBCXX_ENABLE_PARALLEL], [
2826 enable_parallel=no;
2828 # See if configured libgomp/omp.h exists. (libgomp may be in
2829 # noconfigdirs but not explicitly disabled.)
2830 if echo " ${TARGET_CONFIGDIRS} " | grep " libgomp " > /dev/null 2>&1 ; then
2831 enable_parallel=yes;
2832 else
2833 AC_MSG_NOTICE([target-libgomp not built])
2834 fi
2836 AC_MSG_CHECKING([for parallel mode support])
2837 AC_MSG_RESULT([$enable_parallel])
2838 ])
2841 dnl
2842 dnl Check for which I/O library to use: stdio and POSIX, or pure stdio.
2843 dnl
2844 dnl Default is stdio_posix.
2845 dnl
2846 AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
2847 AC_MSG_CHECKING([for underlying I/O to use])
2848 GLIBCXX_ENABLE(cstdio,stdio,[[[=PACKAGE]]],
2849 [use target-specific I/O package], [permit stdio|stdio_posix|stdio_pure])
2851 # The only available I/O model is based on stdio, via basic_file_stdio.
2852 # The default "stdio" is actually "stdio + POSIX" because it uses fdopen(3)
2853 # to get a file descriptor and then uses read(3) and write(3) with it.
2854 # The "stdio_pure" model doesn't use fdopen and only uses FILE* for I/O.
2855 case ${enable_cstdio} in
2856 stdio*)
2857 CSTDIO_H=config/io/c_io_stdio.h
2858 BASIC_FILE_H=config/io/basic_file_stdio.h
2859 BASIC_FILE_CC=config/io/basic_file_stdio.cc
2860 AC_MSG_RESULT(stdio)
2862 if test "x$enable_cstdio" = "xstdio_pure" ; then
2863 AC_DEFINE(_GLIBCXX_USE_STDIO_PURE, 1,
2864 [Define to restrict std::__basic_file<> to stdio APIs.])
2865 fi
2866 ;;
2867 esac
2869 AC_SUBST(CSTDIO_H)
2870 AC_SUBST(BASIC_FILE_H)
2871 AC_SUBST(BASIC_FILE_CC)
2872 ])
2875 dnl
2876 dnl Check for "unusual" flags to pass to the compiler while building.
2877 dnl
2878 dnl --enable-cxx-flags='-foo -bar -baz' is a general method for passing
2879 dnl experimental flags such as -fpch, -fIMI, -Dfloat=char, etc.
2880 dnl --disable-cxx-flags passes nothing.
2881 dnl + See http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00131.html
2882 dnl http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00284.html
2883 dnl http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00035.html
2884 dnl + Usage: GLIBCXX_ENABLE_CXX_FLAGS(default flags)
2885 dnl If "default flags" is an empty string, the effect is the same
2886 dnl as --disable or --enable=no.
2887 dnl
2888 AC_DEFUN([GLIBCXX_ENABLE_CXX_FLAGS], [dnl
2889 AC_MSG_CHECKING([for extra compiler flags for building])
2890 GLIBCXX_ENABLE(cxx-flags,$1,[=FLAGS],
2891 [pass compiler FLAGS when building library],
2892 [case "x$enable_cxx_flags" in
2893 xno | x) enable_cxx_flags= ;;
2894 x-*) ;;
2895 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2896 esac])
2898 # Run through flags (either default or command-line) and set anything
2899 # extra (e.g., #defines) that must accompany particular g++ options.
2900 if test -n "$enable_cxx_flags"; then
2901 for f in $enable_cxx_flags; do
2902 case "$f" in
2903 -fhonor-std) ;;
2904 -*) ;;
2905 *) # and we're trying to pass /what/ exactly?
2906 AC_MSG_ERROR([compiler flags start with a -]) ;;
2907 esac
2908 done
2909 fi
2911 EXTRA_CXX_FLAGS="$enable_cxx_flags"
2912 AC_MSG_RESULT($EXTRA_CXX_FLAGS)
2913 AC_SUBST(EXTRA_CXX_FLAGS)
2914 ])
2917 dnl
2918 dnl Check to see if debugging libraries are to be built.
2919 dnl
2920 dnl --enable-libstdcxx-debug
2921 dnl builds a separate set of debugging libraries in addition to the
2922 dnl normal (shared, static) libstdc++ binaries.
2923 dnl
2924 dnl --disable-libstdcxx-debug
2925 dnl builds only one (non-debug) version of libstdc++.
2926 dnl
2927 dnl --enable-libstdcxx-debug-flags=FLAGS
2928 dnl iff --enable-debug == yes, then use FLAGS to build the debug library.
2929 dnl
2930 dnl + Usage: GLIBCXX_ENABLE_DEBUG[(DEFAULT)]
2931 dnl Where DEFAULT is either `yes' or `no'.
2932 dnl
2933 AC_DEFUN([GLIBCXX_ENABLE_DEBUG], [
2934 AC_MSG_CHECKING([for additional debug build])
2935 skip_debug_build=
2936 GLIBCXX_ENABLE(libstdcxx-debug,$1,,[build extra debug library])
2937 if test x$enable_libstdcxx_debug = xyes; then
2938 if test -f $toplevel_builddir/../stage_final \
2939 && test -f $toplevel_builddir/../stage_current; then
2940 stage_final=`cat $toplevel_builddir/../stage_final`
2941 stage_current=`cat $toplevel_builddir/../stage_current`
2942 if test x$stage_current != x$stage_final ; then
2943 skip_debug_build=" (skipped for bootstrap stage $stage_current)"
2944 enable_libstdcxx_debug=no
2945 fi
2946 fi
2947 fi
2948 AC_MSG_RESULT($enable_libstdcxx_debug$skip_debug_build)
2949 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_DEBUG, test $enable_libstdcxx_debug = yes)
2950 ])
2953 dnl
2954 dnl Check for explicit debug flags.
2955 dnl
2956 dnl --enable-libstdcxx-debug-flags='-O1'
2957 dnl is a general method for passing flags to be used when
2958 dnl building debug libraries with --enable-libstdcxx-debug.
2959 dnl
2960 dnl --disable-libstdcxx-debug-flags does nothing.
2961 dnl + Usage: GLIBCXX_ENABLE_DEBUG_FLAGS(default flags)
2962 dnl If "default flags" is an empty string, the effect is the same
2963 dnl as --disable or --enable=no.
2964 dnl
2965 AC_DEFUN([GLIBCXX_ENABLE_DEBUG_FLAGS], [
2966 GLIBCXX_ENABLE(libstdcxx-debug-flags,[$1],[=FLAGS],
2967 [pass compiler FLAGS when building debug library],
2968 [case "x$enable_libstdcxx_debug_flags" in
2969 xno | x) enable_libstdcxx_debug_flags= ;;
2970 x-*) ;;
2971 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2972 esac])
2974 # Option parsed, now set things appropriately
2975 DEBUG_FLAGS="$enable_libstdcxx_debug_flags"
2976 AC_SUBST(DEBUG_FLAGS)
2978 AC_MSG_NOTICE([Debug build flags set to $DEBUG_FLAGS])
2979 ])
2982 dnl
2983 dnl Check if the user only wants a freestanding library implementation.
2984 dnl
2985 dnl --disable-hosted-libstdcxx will turn off most of the library build,
2986 dnl installing only the headers required by [17.4.1.3] and the language
2987 dnl support library. More than that will be built (to keep the Makefiles
2988 dnl conveniently clean), but not installed.
2989 dnl
2990 dnl Sets:
2991 dnl is_hosted (yes/no)
2992 dnl
2993 dnl Defines:
2994 dnl _GLIBCXX_HOSTED (always defined, either to 1 or 0)
2995 dnl
2996 AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
2997 AC_ARG_ENABLE([hosted-libstdcxx],
2998 AC_HELP_STRING([--disable-hosted-libstdcxx],
2999 [only build freestanding C++ runtime support]),,
3000 [case "$host" in
3001 arm*-*-symbianelf*)
3002 enable_hosted_libstdcxx=no
3003 ;;
3004 *)
3005 enable_hosted_libstdcxx=yes
3006 ;;
3007 esac])
3008 if test "$enable_hosted_libstdcxx" = no; then
3009 AC_MSG_NOTICE([Only freestanding libraries will be built])
3010 is_hosted=no
3011 hosted_define=0
3012 enable_abi_check=no
3013 enable_libstdcxx_pch=no
3014 else
3015 is_hosted=yes
3016 hosted_define=1
3017 fi
3018 GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
3019 AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
3020 [Define to 1 if a full hosted library is built, or 0 if freestanding.])
3021 ])
3024 dnl
3025 dnl Check if the user wants a non-verbose library implementation.
3026 dnl
3027 dnl --disable-libstdcxx-verbose will turn off descriptive messages to
3028 dnl standard error on termination.
3029 dnl
3030 dnl Defines:
3031 dnl _GLIBCXX_VERBOSE (always defined, either to 1 or 0)
3032 dnl
3033 AC_DEFUN([GLIBCXX_ENABLE_VERBOSE], [
3034 AC_ARG_ENABLE([libstdcxx-verbose],
3035 AC_HELP_STRING([--disable-libstdcxx-verbose],
3036 [disable termination messages to standard error]),,
3037 [enable_libstdcxx_verbose=yes])
3038 if test x"$enable_libstdcxx_verbose" = xyes; then
3039 verbose_define=1
3040 else
3041 AC_MSG_NOTICE([verbose termination messages are disabled])
3042 verbose_define=0
3043 fi
3044 AC_DEFINE_UNQUOTED(_GLIBCXX_VERBOSE, $verbose_define,
3045 [Define to 1 if a verbose library is built, or 0 otherwise.])
3046 ])
3049 dnl
3050 dnl Check for template specializations for the 'long long' type.
3051 dnl The result determines only whether 'long long' I/O is enabled; things
3052 dnl like numeric_limits<> specializations are always available.
3053 dnl
3054 dnl --enable-long-long defines _GLIBCXX_USE_LONG_LONG
3055 dnl --disable-long-long leaves _GLIBCXX_USE_LONG_LONG undefined
3056 dnl + Usage: GLIBCXX_ENABLE_LONG_LONG[(DEFAULT)]
3057 dnl Where DEFAULT is either `yes' or `no'.
3058 dnl
3059 AC_DEFUN([GLIBCXX_ENABLE_LONG_LONG], [
3060 GLIBCXX_ENABLE(long-long,$1,,[enable template specializations for 'long long'])
3061 if test $enable_long_long = yes; then
3062 AC_DEFINE(_GLIBCXX_USE_LONG_LONG, 1,
3063 [Define if code specialized for long long should be used.])
3064 fi
3065 AC_MSG_CHECKING([for enabled long long specializations])
3066 AC_MSG_RESULT([$enable_long_long])
3067 ])
3070 dnl
3071 dnl Check for decimal floating point.
3072 dnl See:
3073 dnl http://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float
3074 dnl
3075 dnl This checks to see if the host supports decimal floating point types.
3076 dnl
3077 dnl Defines:
3078 dnl _GLIBCXX_USE_DECIMAL_FLOAT
3079 dnl
3080 AC_DEFUN([GLIBCXX_ENABLE_DECIMAL_FLOAT], [
3082 # Fake what AC_TRY_COMPILE does, without linking as this is
3083 # unnecessary for this test.
3085 cat > conftest.$ac_ext << EOF
3086 [#]line __oline__ "configure"
3087 int main()
3088 {
3089 _Decimal32 d1;
3090 _Decimal64 d2;
3091 _Decimal128 d3;
3092 return 0;
3093 }
3094 EOF
3096 AC_MSG_CHECKING([for ISO/IEC TR 24733 ])
3097 if AC_TRY_EVAL(ac_compile); then
3098 AC_DEFINE(_GLIBCXX_USE_DECIMAL_FLOAT, 1,
3099 [Define if ISO/IEC TR 24733 decimal floating point types are supported on this host.])
3100 enable_dfp=yes
3101 else
3102 enable_dfp=no
3103 fi
3104 AC_MSG_RESULT($enable_dfp)
3105 rm -f conftest*
3106 ])
3108 dnl
3109 dnl Check for GNU 128-bit integer and floating point types.
3110 dnl
3111 dnl Note: also checks that the types aren't standard types.
3112 dnl
3113 dnl Defines:
3114 dnl _GLIBCXX_USE_INT128
3115 dnl ENABLE_FLOAT128
3116 dnl
3117 AC_DEFUN([GLIBCXX_ENABLE_INT128_FLOAT128], [
3119 AC_LANG_SAVE
3120 AC_LANG_CPLUSPLUS
3122 # Fake what AC_TRY_COMPILE does, without linking as this is
3123 # unnecessary for this test.
3125 cat > conftest.$ac_ext << EOF
3126 [#]line __oline__ "configure"
3127 template<typename T1, typename T2>
3128 struct same
3129 { typedef T2 type; };
3131 template<typename T>
3132 struct same<T, T>;
3134 int main()
3135 {
3136 typename same<long, __int128>::type i1;
3137 typename same<long long, __int128>::type i2;
3138 }
3139 EOF
3141 AC_MSG_CHECKING([for __int128])
3142 if AC_TRY_EVAL(ac_compile); then
3143 AC_DEFINE(_GLIBCXX_USE_INT128, 1,
3144 [Define if __int128 is supported on this host.])
3145 enable_int128=yes
3146 else
3147 enable_int128=no
3148 fi
3149 AC_MSG_RESULT($enable_int128)
3150 rm -f conftest*
3152 cat > conftest.$ac_ext << EOF
3153 [#]line __oline__ "configure"
3154 template<typename T1, typename T2>
3155 struct same
3156 { typedef T2 type; };
3158 template<typename T>
3159 struct same<T, T>;
3161 int main()
3162 {
3163 typename same<double, __float128>::type f1;
3164 typename same<long double, __float128>::type f2;
3165 }
3166 EOF
3168 AC_MSG_CHECKING([for __float128])
3169 if AC_TRY_EVAL(ac_compile); then
3170 enable_float128=yes
3171 else
3172 enable_float128=no
3173 fi
3174 AC_MSG_RESULT($enable_float128)
3175 GLIBCXX_CONDITIONAL(ENABLE_FLOAT128, test $enable_float128 = yes)
3176 rm -f conftest*
3178 AC_LANG_RESTORE
3179 ])
3181 dnl
3182 dnl Check for template specializations for the 'wchar_t' type.
3183 dnl
3184 dnl --enable-wchar_t defines _GLIBCXX_USE_WCHAR_T
3185 dnl --disable-wchar_t leaves _GLIBCXX_USE_WCHAR_T undefined
3186 dnl + Usage: GLIBCXX_ENABLE_WCHAR_T[(DEFAULT)]
3187 dnl Where DEFAULT is either `yes' or `no'.
3188 dnl
3189 dnl Necessary support must also be present.
3190 dnl
3191 AC_DEFUN([GLIBCXX_ENABLE_WCHAR_T], [
3192 GLIBCXX_ENABLE(wchar_t,$1,,[enable template specializations for 'wchar_t'])
3194 # Test wchar.h for mbstate_t, which is needed for char_traits and fpos.
3195 AC_CHECK_HEADERS(wchar.h, ac_has_wchar_h=yes, ac_has_wchar_h=no)
3196 AC_MSG_CHECKING([for mbstate_t])
3197 AC_TRY_COMPILE([#include <wchar.h>],
3198 [mbstate_t teststate;],
3199 have_mbstate_t=yes, have_mbstate_t=no)
3200 AC_MSG_RESULT($have_mbstate_t)
3201 if test x"$have_mbstate_t" = xyes; then
3202 AC_DEFINE(HAVE_MBSTATE_T,1,[Define if mbstate_t exists in wchar.h.])
3203 fi
3205 # Test it always, for use in GLIBCXX_ENABLE_C99, together with
3206 # ac_has_wchar_h.
3207 AC_CHECK_HEADERS(wctype.h, ac_has_wctype_h=yes, ac_has_wctype_h=no)
3209 if test x"$enable_wchar_t" = x"yes"; then
3211 AC_LANG_SAVE
3212 AC_LANG_CPLUSPLUS
3214 if test x"$ac_has_wchar_h" = xyes &&
3215 test x"$ac_has_wctype_h" = xyes; then
3216 AC_TRY_COMPILE([#include <wchar.h>
3217 #include <stddef.h>
3218 wint_t i;
3219 long l = WEOF;
3220 long j = WCHAR_MIN;
3221 long k = WCHAR_MAX;
3222 namespace test
3223 {
3224 using ::btowc;
3225 using ::fgetwc;
3226 using ::fgetws;
3227 using ::fputwc;
3228 using ::fputws;
3229 using ::fwide;
3230 using ::fwprintf;
3231 using ::fwscanf;
3232 using ::getwc;
3233 using ::getwchar;
3234 using ::mbrlen;
3235 using ::mbrtowc;
3236 using ::mbsinit;
3237 using ::mbsrtowcs;
3238 using ::putwc;
3239 using ::putwchar;
3240 using ::swprintf;
3241 using ::swscanf;
3242 using ::ungetwc;
3243 using ::vfwprintf;
3244 using ::vswprintf;
3245 using ::vwprintf;
3246 using ::wcrtomb;
3247 using ::wcscat;
3248 using ::wcschr;
3249 using ::wcscmp;
3250 using ::wcscoll;
3251 using ::wcscpy;
3252 using ::wcscspn;
3253 using ::wcsftime;
3254 using ::wcslen;
3255 using ::wcsncat;
3256 using ::wcsncmp;
3257 using ::wcsncpy;
3258 using ::wcspbrk;
3259 using ::wcsrchr;
3260 using ::wcsrtombs;
3261 using ::wcsspn;
3262 using ::wcsstr;
3263 using ::wcstod;
3264 using ::wcstok;
3265 using ::wcstol;
3266 using ::wcstoul;
3267 using ::wcsxfrm;
3268 using ::wctob;
3269 using ::wmemchr;
3270 using ::wmemcmp;
3271 using ::wmemcpy;
3272 using ::wmemmove;
3273 using ::wmemset;
3274 using ::wprintf;
3275 using ::wscanf;
3276 }
3277 ],[],[], [enable_wchar_t=no])
3278 else
3279 enable_wchar_t=no
3280 fi
3282 AC_LANG_RESTORE
3283 fi
3285 if test x"$enable_wchar_t" = x"yes"; then
3286 AC_DEFINE(_GLIBCXX_USE_WCHAR_T, 1,
3287 [Define if code specialized for wchar_t should be used.])
3288 fi
3290 AC_MSG_CHECKING([for enabled wchar_t specializations])
3291 AC_MSG_RESULT([$enable_wchar_t])
3292 ])
3295 dnl
3296 dnl Check to see if building and using a C++ precompiled header can be done.
3297 dnl
3298 dnl --enable-libstdcxx-pch=yes
3299 dnl default, this shows intent to use stdc++.h.gch If it looks like it
3300 dnl may work, after some light-hearted attempts to puzzle out compiler
3301 dnl support, flip bits on in include/Makefile.am
3302 dnl
3303 dnl --disable-libstdcxx-pch
3304 dnl turns off attempts to use or build stdc++.h.gch.
3305 dnl
3306 dnl Substs:
3307 dnl glibcxx_PCHFLAGS
3308 dnl
3309 AC_DEFUN([GLIBCXX_ENABLE_PCH], [
3310 GLIBCXX_ENABLE(libstdcxx-pch,$1,,[build pre-compiled libstdc++ headers])
3311 if test $enable_libstdcxx_pch = yes; then
3312 AC_CACHE_CHECK([for compiler with PCH support],
3313 [glibcxx_cv_prog_CXX_pch],
3314 [ac_save_CXXFLAGS="$CXXFLAGS"
3315 CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
3316 AC_LANG_SAVE
3317 AC_LANG_CPLUSPLUS
3318 echo '#include <math.h>' > conftest.h
3319 if $CXX $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
3320 -o conftest.h.gch 1>&5 2>&1 &&
3321 echo '#error "pch failed"' > conftest.h &&
3322 echo '#include "conftest.h"' > conftest.cc &&
3323 $CXX -c $CXXFLAGS $CPPFLAGS conftest.cc 1>&5 2>&1 ;
3324 then
3325 glibcxx_cv_prog_CXX_pch=yes
3326 else
3327 glibcxx_cv_prog_CXX_pch=no
3328 fi
3329 rm -f conftest*
3330 CXXFLAGS=$ac_save_CXXFLAGS
3331 AC_LANG_RESTORE
3332 ])
3333 enable_libstdcxx_pch=$glibcxx_cv_prog_CXX_pch
3334 fi
3336 AC_MSG_CHECKING([for enabled PCH])
3337 AC_MSG_RESULT([$enable_libstdcxx_pch])
3339 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_PCH, test $enable_libstdcxx_pch = yes)
3340 if test $enable_libstdcxx_pch = yes; then
3341 glibcxx_PCHFLAGS="-include bits/stdc++.h"
3342 else
3343 glibcxx_PCHFLAGS=""
3344 fi
3345 AC_SUBST(glibcxx_PCHFLAGS)
3346 ])
3349 dnl
3350 dnl Check for atomic builtins.
3351 dnl See:
3352 dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
3353 dnl
3354 dnl This checks to see if the host supports the compiler-generated
3355 dnl builtins for atomic operations for various integral sizes. Note, this
3356 dnl is intended to be an all-or-nothing switch, so all the atomic operations
3357 dnl that are used should be checked.
3358 dnl
3359 dnl Note:
3360 dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
3361 dnl
3362 AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
3363 AC_LANG_SAVE
3364 AC_LANG_CPLUSPLUS
3365 old_CXXFLAGS="$CXXFLAGS"
3367 # Do link tests if possible, instead asm tests, limited to some platforms
3368 # see discussion in PR target/40134, PR libstdc++/40133 and the thread
3369 # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
3370 atomic_builtins_link_tests=no
3371 if test x$gcc_no_link != xyes; then
3372 # Can do link tests. Limit to some tested platforms
3373 case "$host" in
3374 *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
3375 atomic_builtins_link_tests=yes
3376 ;;
3377 esac
3378 fi
3380 if test x$atomic_builtins_link_tests = xyes; then
3382 # Do link tests.
3384 CXXFLAGS="$CXXFLAGS -fno-exceptions"
3386 AC_MSG_CHECKING([for atomic builtins for bool])
3387 AC_CACHE_VAL(glibcxx_cv_atomic_bool, [
3388 AC_TRY_LINK(
3389 [ ],
3390 [typedef bool atomic_type;
3391 atomic_type c1;
3392 atomic_type c2;
3393 atomic_type c3(0);
3394 // N.B. __atomic_fetch_add is not supported for bool.
3395 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3396 __ATOMIC_RELAXED);
3397 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3398 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3399 ],
3400 [glibcxx_cv_atomic_bool=yes],
3401 [glibcxx_cv_atomic_bool=no])
3402 ])
3403 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3405 AC_MSG_CHECKING([for atomic builtins for short])
3406 AC_CACHE_VAL(glibcxx_cv_atomic_short, [
3407 AC_TRY_LINK(
3408 [ ],
3409 [typedef short atomic_type;
3410 atomic_type c1;
3411 atomic_type c2;
3412 atomic_type c3(0);
3413 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3414 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3415 __ATOMIC_RELAXED);
3416 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3417 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3418 ],
3419 [glibcxx_cv_atomic_short=yes],
3420 [glibcxx_cv_atomic_short=no])
3421 ])
3422 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3424 AC_MSG_CHECKING([for atomic builtins for int])
3425 AC_CACHE_VAL(glibcxx_cv_atomic_int, [
3426 AC_TRY_LINK(
3427 [ ],
3428 [typedef int atomic_type;
3429 atomic_type c1;
3430 atomic_type c2;
3431 atomic_type c3(0);
3432 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3433 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3434 __ATOMIC_RELAXED);
3435 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3436 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3437 ],
3438 [glibcxx_cv_atomic_int=yes],
3439 [glibcxx_cv_atomic_int=no])
3440 ])
3441 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3443 AC_MSG_CHECKING([for atomic builtins for long long])
3444 AC_CACHE_VAL(glibcxx_cv_atomic_long_long, [
3445 AC_TRY_LINK(
3446 [ ],
3447 [typedef long long atomic_type;
3448 atomic_type c1;
3449 atomic_type c2;
3450 atomic_type c3(0);
3451 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3452 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3453 __ATOMIC_RELAXED);
3454 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3455 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3456 ],
3457 [glibcxx_cv_atomic_long_long=yes],
3458 [glibcxx_cv_atomic_long_long=no])
3459 ])
3460 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3462 else
3464 # Do asm tests.
3466 # Compile unoptimized.
3467 CXXFLAGS='-O0 -S'
3469 # Fake what AC_TRY_COMPILE does.
3471 cat > conftest.$ac_ext << EOF
3472 [#]line __oline__ "configure"
3473 int main()
3474 {
3475 typedef bool atomic_type;
3476 atomic_type c1;
3477 atomic_type c2;
3478 atomic_type c3(0);
3479 // N.B. __atomic_fetch_add is not supported for bool.
3480 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3481 __ATOMIC_RELAXED);
3482 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3483 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3485 return 0;
3486 }
3487 EOF
3489 AC_MSG_CHECKING([for atomic builtins for bool])
3490 if AC_TRY_EVAL(ac_compile); then
3491 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3492 glibcxx_cv_atomic_bool=no
3493 else
3494 glibcxx_cv_atomic_bool=yes
3495 fi
3496 fi
3497 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3498 rm -f conftest*
3500 cat > conftest.$ac_ext << EOF
3501 [#]line __oline__ "configure"
3502 int main()
3503 {
3504 typedef short atomic_type;
3505 atomic_type c1;
3506 atomic_type c2;
3507 atomic_type c3(0);
3508 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3509 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3510 __ATOMIC_RELAXED);
3511 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3512 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3514 return 0;
3515 }
3516 EOF
3518 AC_MSG_CHECKING([for atomic builtins for short])
3519 if AC_TRY_EVAL(ac_compile); then
3520 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3521 glibcxx_cv_atomic_short=no
3522 else
3523 glibcxx_cv_atomic_short=yes
3524 fi
3525 fi
3526 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3527 rm -f conftest*
3529 cat > conftest.$ac_ext << EOF
3530 [#]line __oline__ "configure"
3531 int main()
3532 {
3533 // NB: _Atomic_word not necessarily int.
3534 typedef int atomic_type;
3535 atomic_type c1;
3536 atomic_type c2;
3537 atomic_type c3(0);
3538 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3539 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3540 __ATOMIC_RELAXED);
3541 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3542 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3544 return 0;
3545 }
3546 EOF
3548 AC_MSG_CHECKING([for atomic builtins for int])
3549 if AC_TRY_EVAL(ac_compile); then
3550 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3551 glibcxx_cv_atomic_int=no
3552 else
3553 glibcxx_cv_atomic_int=yes
3554 fi
3555 fi
3556 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3557 rm -f conftest*
3559 cat > conftest.$ac_ext << EOF
3560 [#]line __oline__ "configure"
3561 int main()
3562 {
3563 typedef long long atomic_type;
3564 atomic_type c1;
3565 atomic_type c2;
3566 atomic_type c3(0);
3567 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3568 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3569 __ATOMIC_RELAXED);
3570 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3571 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3573 return 0;
3574 }
3575 EOF
3577 AC_MSG_CHECKING([for atomic builtins for long long])
3578 if AC_TRY_EVAL(ac_compile); then
3579 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3580 glibcxx_cv_atomic_long_long=no
3581 else
3582 glibcxx_cv_atomic_long_long=yes
3583 fi
3584 fi
3585 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3586 rm -f conftest*
3588 fi
3590 CXXFLAGS="$old_CXXFLAGS"
3591 AC_LANG_RESTORE
3593 # Set atomicity_dir to builtins if all but the long long test above passes,
3594 # or if the builtins were already chosen (e.g. by configure.host).
3595 if { test "$glibcxx_cv_atomic_bool" = yes \
3596 && test "$glibcxx_cv_atomic_short" = yes \
3597 && test "$glibcxx_cv_atomic_int" = yes; } \
3598 || test "$atomicity_dir" = "cpu/generic/atomicity_builtins"; then
3599 AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS, 1,
3600 [Define if the compiler supports C++11 atomics.])
3601 atomicity_dir=cpu/generic/atomicity_builtins
3602 fi
3604 # If still generic, set to mutex.
3605 if test $atomicity_dir = "cpu/generic" ; then
3606 atomicity_dir=cpu/generic/atomicity_mutex
3607 AC_MSG_WARN([No native atomic operations are provided for this platform.])
3608 if test "x$target_thread_file" = xsingle; then
3609 AC_MSG_WARN([They cannot be faked when thread support is disabled.])
3610 AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
3611 else
3612 AC_MSG_WARN([They will be faked using a mutex.])
3613 AC_MSG_WARN([Performance of certain classes will degrade as a result.])
3614 fi
3615 fi
3617 ])
3619 dnl
3620 dnl Set default lock policy for synchronizing shared_ptr reference counting.
3621 dnl
3622 dnl --with-libstdcxx-lock-policy=auto
3623 dnl Use atomic operations for shared_ptr reference counting only if
3624 dnl the default target supports atomic compare-and-swap.
3625 dnl --with-libstdcxx-lock-policy=atomic
3626 dnl Use atomic operations for shared_ptr reference counting.
3627 dnl --with-libstdcxx-lock-policy=mutex
3628 dnl Use a mutex to synchronize shared_ptr reference counting.
3629 dnl
3630 dnl This controls the value of __gnu_cxx::__default_lock_policy, which
3631 dnl determines how shared_ptr reference counts are synchronized.
3632 dnl The option "atomic" means that atomic operations should be used,
3633 dnl "mutex" means that a mutex will be used. The default option, "auto",
3634 dnl will check if the target supports the compiler-generated builtins
3635 dnl for atomic compare-and-swap operations for 2-byte and 4-byte integers,
3636 dnl and will use "atomic" if supported, "mutex" otherwise.
3637 dnl This option is ignored if the thread model used by GCC is "single",
3638 dnl as no synchronization is used at all in that case.
3639 dnl This option affects the library ABI (except in the "single" thread model).
3640 dnl
3641 dnl Defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY to 1 if atomics should be used.
3642 dnl
3643 AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [
3645 AC_ARG_WITH([libstdcxx-lock-policy],
3646 AC_HELP_STRING([--with-libstdcxx-lock-policy={atomic,mutex,auto}],
3647 [synchronization policy for shared_ptr reference counting [default=auto]]),
3648 [libstdcxx_atomic_lock_policy=$withval],
3649 [libstdcxx_atomic_lock_policy=auto])
3651 case "$libstdcxx_atomic_lock_policy" in
3652 atomic|mutex|auto) ;;
3653 *) AC_MSG_ERROR([Invalid argument for --with-libstdcxx-lock-policy]) ;;
3654 esac
3655 AC_MSG_CHECKING([for lock policy for shared_ptr reference counts])
3657 if test x"$libstdcxx_atomic_lock_policy" = x"auto"; then
3658 AC_LANG_SAVE
3659 AC_LANG_CPLUSPLUS
3660 ac_save_CXXFLAGS="$CXXFLAGS"
3662 dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?!
3663 AC_TRY_COMPILE([
3664 #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
3665 # error "No 2-byte compare-and-swap"
3666 #elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
3667 # error "No 4-byte compare-and-swap"
3668 #endif
3669 ],,
3670 [libstdcxx_atomic_lock_policy=atomic],
3671 [libstdcxx_atomic_lock_policy=mutex])
3672 AC_LANG_RESTORE
3673 CXXFLAGS="$ac_save_CXXFLAGS"
3674 fi
3676 if test x"$libstdcxx_atomic_lock_policy" = x"atomic"; then
3677 AC_MSG_RESULT(atomic)
3678 AC_DEFINE(HAVE_ATOMIC_LOCK_POLICY,1,
3679 [Defined if shared_ptr reference counting should use atomic operations.])
3680 else
3681 AC_MSG_RESULT(mutex)
3682 fi
3684 ])
3686 dnl
3687 dnl Allow visibility attributes to be used on namespaces, objects, etc.
3688 dnl
3689 dnl --enable-libstdcxx-visibility enables attempt to use visibility attributes.
3690 dnl --disable-libstdcxx-visibility turns off all use of visibility attributes.
3691 dnl + Usage: GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY[(DEFAULT)]
3692 dnl Where DEFAULT is 'yes'.
3693 dnl
3694 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY], [
3695 GLIBCXX_ENABLE(libstdcxx-visibility,$1,,[enables visibility safe usage])
3697 if test x$enable_libstdcxx_visibility = xyes ; then
3698 dnl all hail libgfortran
3699 dnl Check whether the target supports hidden visibility.
3700 AC_CACHE_CHECK([whether the target supports hidden visibility],
3701 glibcxx_cv_have_attribute_visibility, [
3702 save_CFLAGS="$CFLAGS"
3703 CFLAGS="$CFLAGS -Werror"
3704 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
3705 [], glibcxx_cv_have_attribute_visibility=yes,
3706 glibcxx_cv_have_attribute_visibility=no)
3707 CFLAGS="$save_CFLAGS"])
3708 if test $glibcxx_cv_have_attribute_visibility = no; then
3709 enable_libstdcxx_visibility=no
3710 fi
3711 fi
3713 GLIBCXX_CONDITIONAL(ENABLE_VISIBILITY, test $enable_libstdcxx_visibility = yes)
3714 AC_MSG_NOTICE([visibility supported: $enable_libstdcxx_visibility])
3715 ])
3718 dnl
3719 dnl Add version tags to symbols in shared library (or not), additionally
3720 dnl marking other symbols as private/local (or not).
3721 dnl
3722 dnl Sets libtool_VERSION, and determines shared library SONAME.
3723 dnl
3724 dnl This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
3725 dnl
3726 dnl --enable-symvers=style adds a version script to the linker call when
3727 dnl creating the shared library. The choice of version script is
3728 dnl controlled by 'style'.
3729 dnl --disable-symvers does not.
3730 dnl
3731 dnl + Usage: GLIBCXX_ENABLE_SYMVERS[(DEFAULT)]
3732 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
3733 dnl choose a default style based on linker characteristics. Passing
3734 dnl 'no' disables versioning.
3735 dnl
3736 AC_DEFUN([GLIBCXX_ENABLE_SYMVERS], [
3738 GLIBCXX_ENABLE(symvers,$1,[[[=STYLE]]],
3739 [enables symbol versioning of the shared library],
3740 [permit yes|no|gnu|gnu-versioned-namespace|darwin|darwin-export|sun])
3742 # If we never went through the GLIBCXX_CHECK_LINKER_FEATURES macro, then we
3743 # don't know enough about $LD to do tricks...
3744 AC_REQUIRE([GLIBCXX_CHECK_LINKER_FEATURES])
3745 # Sun style symbol versions needs GNU c++filt for make_sunver.pl to work
3746 # with extern "C++" in version scripts.
3747 AC_REQUIRE([GCC_PROG_GNU_CXXFILT])
3749 # Turn a 'yes' into a suitable default.
3750 if test x$enable_symvers = xyes ; then
3751 if test $enable_shared = no || test "x$LD" = x || test x$gcc_no_link = xyes; then
3752 enable_symvers=no
3753 else
3754 if test $with_gnu_ld = yes ; then
3755 case ${target_os} in
3756 hpux*)
3757 enable_symvers=no ;;
3758 *)
3759 enable_symvers=gnu ;;
3760 esac
3761 else
3762 case ${target_os} in
3763 darwin*)
3764 enable_symvers=darwin ;;
3765 # Sun symbol versioning exists since Solaris 2.5.
3766 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
3767 # make_sunver.pl needs GNU c++filt to support extern "C++" in
3768 # version scripts, so disable symbol versioning if none can be
3769 # found.
3770 if test -z "$ac_cv_path_CXXFILT"; then
3771 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3772 AC_MSG_WARN([=== no GNU c++filt could be found.])
3773 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3774 enable_symvers=no
3775 else
3776 enable_symvers=sun
3777 fi
3778 ;;
3779 *)
3780 enable_symvers=no ;;
3781 esac
3782 fi
3783 fi
3784 fi
3786 # Check to see if 'darwin' or 'darwin-export' can win.
3787 if test x$enable_symvers = xdarwin-export ; then
3788 enable_symvers=darwin
3789 fi
3791 # Check if 'sun' was requested on non-Solaris 2 platforms.
3792 if test x$enable_symvers = xsun ; then
3793 case ${target_os} in
3794 solaris2*)
3795 # All fine.
3796 ;;
3797 *)
3798 # Unlikely to work.
3799 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3800 AC_MSG_WARN([=== you are not targetting Solaris 2.])
3801 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3802 enable_symvers=no
3803 ;;
3804 esac
3805 fi
3807 # Check to see if 'gnu' can win.
3808 if test $enable_symvers = gnu ||
3809 test $enable_symvers = gnu-versioned-namespace ||
3810 test $enable_symvers = sun; then
3811 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
3812 AC_MSG_CHECKING([for shared libgcc])
3813 ac_save_CFLAGS="$CFLAGS"
3814 CFLAGS=' -lgcc_s'
3815 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes, glibcxx_shared_libgcc=no)
3816 CFLAGS="$ac_save_CFLAGS"
3817 if test $glibcxx_shared_libgcc = no; then
3818 cat > conftest.c <<EOF
3819 int main (void) { return 0; }
3820 EOF
3821 changequote(,)dnl
3822 glibcxx_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
3823 -shared -shared-libgcc -o conftest.so \
3824 conftest.c -v 2>&1 >/dev/null \
3825 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
3826 changequote([,])dnl
3827 rm -f conftest.c conftest.so
3828 if test x${glibcxx_libgcc_s_suffix+set} = xset; then
3829 CFLAGS=" -lgcc_s$glibcxx_libgcc_s_suffix"
3830 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes)
3831 CFLAGS="$ac_save_CFLAGS"
3832 fi
3833 fi
3834 AC_MSG_RESULT($glibcxx_shared_libgcc)
3836 # For GNU ld, we need at least this version. The format is described in
3837 # GLIBCXX_CHECK_LINKER_FEATURES above.
3838 glibcxx_min_gnu_ld_version=21400
3840 # If no shared libgcc, can't win.
3841 if test $glibcxx_shared_libgcc != yes; then
3842 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3843 AC_MSG_WARN([=== you are not building a shared libgcc_s.])
3844 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3845 enable_symvers=no
3846 elif test $with_gnu_ld != yes && test $enable_symvers = sun; then
3847 : All interesting versions of Sun ld support sun style symbol versioning.
3848 elif test $with_gnu_ld != yes ; then
3849 # just fail for now
3850 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3851 AC_MSG_WARN([=== you are not using the GNU linker.])
3852 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3853 enable_symvers=no
3854 elif test $glibcxx_ld_is_gold = yes ; then
3855 : All versions of gold support symbol versioning.
3856 elif test $glibcxx_gnu_ld_version -lt $glibcxx_min_gnu_ld_version ; then
3857 # The right tools, the right setup, but too old. Fallbacks?
3858 AC_MSG_WARN(=== Linker version $glibcxx_gnu_ld_version is too old for)
3859 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
3860 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
3861 AC_MSG_WARN(=== $glibcxx_min_gnu_ld_version or later and rebuild GCC.)
3862 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3863 enable_symvers=no
3864 fi
3865 fi
3867 # For libtool versioning info, format is CURRENT:REVISION:AGE
3868 libtool_VERSION=6:29:0
3870 # Everything parsed; figure out what files and settings to use.
3871 case $enable_symvers in
3872 no)
3873 SYMVER_FILE=config/abi/pre/none.ver
3874 ;;
3875 gnu)
3876 SYMVER_FILE=config/abi/pre/gnu.ver
3877 AC_DEFINE(_GLIBCXX_SYMVER_GNU, 1,
3878 [Define to use GNU versioning in the shared library.])
3879 ;;
3880 gnu-versioned-namespace)
3881 libtool_VERSION=8:0:0
3882 SYMVER_FILE=config/abi/pre/gnu-versioned-namespace.ver
3883 AC_DEFINE(_GLIBCXX_SYMVER_GNU_NAMESPACE, 1,
3884 [Define to use GNU namespace versioning in the shared library.])
3885 ;;
3886 darwin)
3887 SYMVER_FILE=config/abi/pre/gnu.ver
3888 AC_DEFINE(_GLIBCXX_SYMVER_DARWIN, 1,
3889 [Define to use darwin versioning in the shared library.])
3890 ;;
3891 sun)
3892 SYMVER_FILE=config/abi/pre/gnu.ver
3893 AC_DEFINE(_GLIBCXX_SYMVER_SUN, 1,
3894 [Define to use Sun versioning in the shared library.])
3895 ;;
3896 esac
3898 if test x$enable_symvers != xno ; then
3899 AC_DEFINE(_GLIBCXX_SYMVER, 1,
3900 [Define to use symbol versioning in the shared library.])
3901 fi
3903 AC_CACHE_CHECK([whether the target supports .symver directive],
3904 glibcxx_cv_have_as_symver_directive, [
3905 AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
3906 [], glibcxx_cv_have_as_symver_directive=yes,
3907 glibcxx_cv_have_as_symver_directive=no)])
3908 if test $glibcxx_cv_have_as_symver_directive = yes; then
3909 AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
3910 [Define to 1 if the target assembler supports .symver directive.])
3911 fi
3913 AC_SUBST(SYMVER_FILE)
3914 AC_SUBST(port_specific_symbol_files)
3915 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS, test $enable_symvers != no)
3916 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU, test $enable_symvers = gnu)
3917 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU_NAMESPACE, test $enable_symvers = gnu-versioned-namespace)
3918 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_DARWIN, test $enable_symvers = darwin)
3919 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_SUN, test $enable_symvers = sun)
3920 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
3922 if test $enable_symvers != no ; then
3923 case ${target_os} in
3924 # The Solaris 2 runtime linker doesn't support the GNU extension of
3925 # binding the same symbol to different versions
3926 solaris2*)
3927 ;;
3928 # Other platforms with GNU symbol versioning (GNU/Linux, more?) do.
3929 *)
3930 AC_DEFINE(HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT, 1,
3931 [Define to 1 if the target runtime linker supports binding the same symbol to different versions.])
3932 ;;
3933 esac
3934 fi
3936 # Now, set up compatibility support, if any.
3937 # In addition, need this to deal with std::size_t mangling in
3938 # src/compatibility.cc. In a perfect world, could use
3939 # typeid(std::size_t).name()[0] to do direct substitution.
3940 AC_MSG_CHECKING([for size_t as unsigned int])
3941 ac_save_CFLAGS="$CFLAGS"
3942 CFLAGS="-Werror"
3943 AC_TRY_COMPILE(, [__SIZE_TYPE__* stp; unsigned int* uip; stp = uip;],
3944 [glibcxx_size_t_is_i=yes], [glibcxx_size_t_is_i=no])
3945 CFLAGS=$ac_save_CFLAGS
3946 if test "$glibcxx_size_t_is_i" = yes; then
3947 AC_DEFINE(_GLIBCXX_SIZE_T_IS_UINT, 1, [Define if size_t is unsigned int.])
3948 fi
3949 AC_MSG_RESULT([$glibcxx_size_t_is_i])
3951 AC_MSG_CHECKING([for ptrdiff_t as int])
3952 ac_save_CFLAGS="$CFLAGS"
3953 CFLAGS="-Werror"
3954 AC_TRY_COMPILE(, [__PTRDIFF_TYPE__* ptp; int* ip; ptp = ip;],
3955 [glibcxx_ptrdiff_t_is_i=yes], [glibcxx_ptrdiff_t_is_i=no])
3956 CFLAGS=$ac_save_CFLAGS
3957 if test "$glibcxx_ptrdiff_t_is_i" = yes; then
3958 AC_DEFINE(_GLIBCXX_PTRDIFF_T_IS_INT, 1, [Define if ptrdiff_t is int.])
3959 fi
3960 AC_MSG_RESULT([$glibcxx_ptrdiff_t_is_i])
3961 ])
3964 dnl
3965 dnl Setup to use the gcc gthr.h thread-specific memory and mutex model.
3966 dnl We must stage the required headers so that they will be installed
3967 dnl with the library (unlike libgcc, the STL implementation is provided
3968 dnl solely within headers). Since we must not inject random user-space
3969 dnl macro names into user-provided C++ code, we first stage into <file>-in
3970 dnl and process to <file> with an output command. The reason for a two-
3971 dnl stage process here is to correctly handle $srcdir!=$objdir without
3972 dnl having to write complex code (the sed commands to clean the macro
3973 dnl namespace are complex and fragile enough as it is). We must also
3974 dnl add a relative path so that -I- is supported properly.
3975 dnl
3976 dnl Substs:
3977 dnl thread_header
3978 dnl
3979 AC_DEFUN([GLIBCXX_ENABLE_THREADS], [
3980 AC_MSG_CHECKING([for thread model used by GCC])
3981 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3982 AC_MSG_RESULT([$target_thread_file])
3983 GCC_AC_THREAD_HEADER([$target_thread_file])
3984 ])
3987 dnl
3988 dnl Check if gthread implementation defines the types and functions
3989 dnl required by the c++0x thread library. Conforming gthread
3990 dnl implementations can define __GTHREADS_CXX0X to enable use with c++0x.
3991 dnl
3992 dnl GLIBCXX_ENABLE_SYMVERS must be done before this.
3993 dnl
3994 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
3995 GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
3997 if test x$enable_libstdcxx_threads = xauto ||
3998 test x$enable_libstdcxx_threads = xyes; then
4000 AC_LANG_SAVE
4001 AC_LANG_CPLUSPLUS
4003 ac_save_CXXFLAGS="$CXXFLAGS"
4004 CXXFLAGS="$CXXFLAGS -fno-exceptions \
4005 -I${toplevel_srcdir}/libgcc -I${toplevel_builddir}/libgcc"
4007 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
4008 case $target_thread_file in
4009 posix)
4010 CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
4011 esac
4013 AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
4015 AC_TRY_COMPILE([#include <unistd.h>],
4016 [
4017 // In case of POSIX threads check _POSIX_TIMEOUTS.
4018 #if (defined(_PTHREADS) \
4019 && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
4020 #error
4021 #endif
4022 ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
4024 AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
4025 [Define to 1 if mutex_timedlock is available.])
4027 if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
4028 else res_mutex_timedlock=no ; fi
4029 AC_MSG_RESULT([$res_mutex_timedlock])
4031 AC_MSG_CHECKING([for gthreads library])
4033 AC_TRY_COMPILE([#include "gthr.h"],
4034 [
4035 #ifndef __GTHREADS_CXX0X
4036 #error
4037 #endif
4038 ], [ac_has_gthreads=yes], [ac_has_gthreads=no])
4039 else
4040 ac_has_gthreads=no
4041 fi
4043 AC_MSG_RESULT([$ac_has_gthreads])
4045 if test x"$ac_has_gthreads" = x"yes"; then
4046 AC_DEFINE(_GLIBCXX_HAS_GTHREADS, 1,
4047 [Define if gthreads library is available.])
4049 # Also check for pthread_rwlock_t for std::shared_timed_mutex in C++14
4050 # but only do so if we're using pthread in the gthread library.
4051 # On VxWorks for example, pthread_rwlock_t is defined in sys/types.h
4052 # but the pthread library is not there by default and the gthread library
4053 # does not use it.
4054 AC_TRY_COMPILE([#include "gthr.h"],
4055 [
4056 #if (!defined(_PTHREADS))
4057 #error
4058 #endif
4059 ], [ac_gthread_use_pthreads=yes], [ac_gthread_use_pthreads=no])
4060 if test x"$ac_gthread_use_pthreads" = x"yes"; then
4061 AC_CHECK_TYPE([pthread_rwlock_t],
4062 [AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
4063 [Define if POSIX read/write locks are available in <gthr.h>.])],
4064 [],
4065 [#include "gthr.h"])
4066 fi
4067 fi
4069 AC_CHECK_HEADER(semaphore.h, [
4070 AC_MSG_CHECKING([for POSIX Semaphores and sem_timedwait])
4071 AC_TRY_COMPILE([
4072 #include <unistd.h>
4073 #include <semaphore.h>
4074 #include <limits.h>
4075 ],
4076 [
4077 #if !defined _POSIX_TIMEOUTS || _POSIX_TIMEOUTS <= 0
4078 # error "POSIX Timeouts option not supported"
4079 #elif !defined _POSIX_SEMAPHORES || _POSIX_SEMAPHORES <= 0
4080 # error "POSIX Semaphores option not supported"
4081 #else
4082 #if defined SEM_VALUE_MAX
4083 constexpr int sem_value_max = SEM_VALUE_MAX;
4084 #elif defined _POSIX_SEM_VALUE_MAX
4085 constexpr int sem_value_max = _POSIX_SEM_VALUE_MAX;
4086 #else
4087 # error "SEM_VALUE_MAX not available"
4088 #endif
4089 sem_t sem;
4090 sem_init(&sem, 0, sem_value_max);
4091 struct timespec ts = { 0 };
4092 sem_timedwait(&sem, &ts);
4093 #endif
4094 ],
4095 [ac_have_posix_semaphore=yes],
4096 [ac_have_posix_semaphore=no])],
4097 [ac_have_posix_semaphore=no])
4099 if test $ac_have_posix_semaphore = yes ; then
4100 AC_DEFINE(HAVE_POSIX_SEMAPHORE,
4101 1,
4102 [Define to 1 if POSIX Semaphores with sem_timedwait are available in <semaphore.h>.])
4103 fi
4104 AC_MSG_RESULT([$ac_have_posix_semaphore])
4106 CXXFLAGS="$ac_save_CXXFLAGS"
4107 AC_LANG_RESTORE
4108 ])
4111 # Check whether LC_MESSAGES is available in <locale.h>.
4112 # Ulrich Drepper <drepper@cygnus.com>, 1995.
4113 #
4114 # This file file be copied and used freely without restrictions. It can
4115 # be used in projects which are not available under the GNU Public License
4116 # but which still want to provide support for the GNU gettext functionality.
4117 # Please note that the actual code is *not* freely available.
4118 AC_DEFUN([AC_LC_MESSAGES], [
4119 AC_CHECK_HEADER(locale.h, [
4120 AC_CACHE_CHECK([for LC_MESSAGES], ac_cv_val_LC_MESSAGES,
4121 [AC_TRY_COMPILE([#include <locale.h>], [return LC_MESSAGES],
4122 ac_cv_val_LC_MESSAGES=yes, ac_cv_val_LC_MESSAGES=no)])
4123 if test $ac_cv_val_LC_MESSAGES = yes; then
4124 AC_DEFINE(HAVE_LC_MESSAGES, 1,
4125 [Define if LC_MESSAGES is available in <locale.h>.])
4126 fi
4127 ])
4128 ])
4130 dnl
4131 dnl Check whether rdrand is supported in the assembler.
4132 AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [
4133 AC_MSG_CHECKING([for rdrand support in assembler])
4134 AC_CACHE_VAL(ac_cv_x86_rdrand, [
4135 ac_cv_x86_rdrand=no
4136 case "$target" in
4137 i?86-*-* | \
4138 x86_64-*-*)
4139 AC_TRY_COMPILE(, [asm("rdrand %eax");],
4140 [ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no])
4141 esac
4142 ])
4143 if test $ac_cv_x86_rdrand = yes; then
4144 AC_DEFINE(_GLIBCXX_X86_RDRAND, 1,
4145 [ Defined if as can handle rdrand. ])
4146 fi
4147 AC_MSG_RESULT($ac_cv_x86_rdrand)
4148 ])
4150 dnl
4151 dnl Check whether rdseed is supported in the assembler.
4152 AC_DEFUN([GLIBCXX_CHECK_X86_RDSEED], [
4153 AC_MSG_CHECKING([for rdseed support in assembler])
4154 AC_CACHE_VAL(ac_cv_x86_rdseed, [
4155 ac_cv_x86_rdseed=no
4156 case "$target" in
4157 i?86-*-* | \
4158 x86_64-*-*)
4159 AC_TRY_COMPILE(, [asm("rdseed %eax");],
4160 [ac_cv_x86_rdseed=yes], [ac_cv_x86_rdseed=no])
4161 esac
4162 ])
4163 if test $ac_cv_x86_rdseed = yes; then
4164 AC_DEFINE(_GLIBCXX_X86_RDSEED, 1,
4165 [ Defined if as can handle rdseed. ])
4166 fi
4167 AC_MSG_RESULT($ac_cv_x86_rdseed)
4168 ])
4170 dnl
4171 dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS.
4172 dnl
4173 AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [
4175 AC_LANG_SAVE
4176 AC_LANG_CPLUSPLUS
4177 ac_save_CXXFLAGS="$CXXFLAGS"
4178 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4180 AC_MSG_CHECKING([for get_nprocs])
4181 AC_CACHE_VAL(glibcxx_cv_GET_NPROCS, [
4182 GCC_TRY_COMPILE_OR_LINK(
4183 [#include <sys/sysinfo.h>],
4184 [int n = get_nprocs();],
4185 [glibcxx_cv_GET_NPROCS=yes],
4186 [glibcxx_cv_GET_NPROCS=no])
4187 ])
4188 if test $glibcxx_cv_GET_NPROCS = yes; then
4189 AC_DEFINE(_GLIBCXX_USE_GET_NPROCS, 1, [Define if get_nprocs is available in <sys/sysinfo.h>.])
4190 fi
4191 AC_MSG_RESULT($glibcxx_cv_GET_NPROCS)
4193 CXXFLAGS="$ac_save_CXXFLAGS"
4194 AC_LANG_RESTORE
4195 ])
4197 dnl
4198 dnl Check whether sysconf(_SC_NPROCESSORS_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROCESSORS_ONLN.
4199 dnl
4200 AC_DEFUN([GLIBCXX_CHECK_SC_NPROCESSORS_ONLN], [
4202 AC_LANG_SAVE
4203 AC_LANG_CPLUSPLUS
4204 ac_save_CXXFLAGS="$CXXFLAGS"
4205 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4207 AC_MSG_CHECKING([for _SC_NPROCESSORS_ONLN])
4208 AC_CACHE_VAL(glibcxx_cv_SC_NPROCESSORS_ONLN, [
4209 GCC_TRY_COMPILE_OR_LINK(
4210 [#include <unistd.h>],
4211 [int n = sysconf(_SC_NPROCESSORS_ONLN);],
4212 [glibcxx_cv_SC_NPROCESSORS_ONLN=yes],
4213 [glibcxx_cv_SC_NPROCESSORS_ONLN=no])
4214 ])
4215 if test $glibcxx_cv_SC_NPROCESSORS_ONLN = yes; then
4216 AC_DEFINE(_GLIBCXX_USE_SC_NPROCESSORS_ONLN, 1, [Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>.])
4217 fi
4218 AC_MSG_RESULT($glibcxx_cv_SC_NPROCESSORS_ONLN)
4220 CXXFLAGS="$ac_save_CXXFLAGS"
4221 AC_LANG_RESTORE
4222 ])
4224 dnl
4225 dnl Check whether sysconf(_SC_NPROC_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROC_ONLN.
4226 dnl
4227 AC_DEFUN([GLIBCXX_CHECK_SC_NPROC_ONLN], [
4229 AC_LANG_SAVE
4230 AC_LANG_CPLUSPLUS
4231 ac_save_CXXFLAGS="$CXXFLAGS"
4232 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4234 AC_MSG_CHECKING([for _SC_NPROC_ONLN])
4235 AC_CACHE_VAL(glibcxx_cv_SC_NPROC_ONLN, [
4236 GCC_TRY_COMPILE_OR_LINK(
4237 [#include <unistd.h>],
4238 [int n = sysconf(_SC_NPROC_ONLN);],
4239 [glibcxx_cv_SC_NPROC_ONLN=yes],
4240 [glibcxx_cv_SC_NPROC_ONLN=no])
4241 ])
4242 if test $glibcxx_cv_SC_NPROC_ONLN = yes; then
4243 AC_DEFINE(_GLIBCXX_USE_SC_NPROC_ONLN, 1, [Define if _SC_NPROC_ONLN is available in <unistd.h>.])
4244 fi
4245 AC_MSG_RESULT($glibcxx_cv_SC_NPROC_ONLN)
4247 CXXFLAGS="$ac_save_CXXFLAGS"
4248 AC_LANG_RESTORE
4249 ])
4251 dnl
4252 dnl Check whether pthread_num_processors_np is available in <pthread.h>, and define _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP.
4253 dnl
4254 AC_DEFUN([GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP], [
4256 AC_LANG_SAVE
4257 AC_LANG_CPLUSPLUS
4258 ac_save_CXXFLAGS="$CXXFLAGS"
4259 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4261 AC_MSG_CHECKING([for pthreads_num_processors_np])
4262 AC_CACHE_VAL(glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP, [
4263 GCC_TRY_COMPILE_OR_LINK(
4264 [#include <pthread.h>],
4265 [int n = pthread_num_processors_np();],
4266 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=yes],
4267 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=no])
4268 ])
4269 if test $glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP = yes; then
4270 AC_DEFINE(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP, 1, [Define if pthreads_num_processors_np is available in <pthread.h>.])
4271 fi
4272 AC_MSG_RESULT($glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP)
4274 CXXFLAGS="$ac_save_CXXFLAGS"
4275 AC_LANG_RESTORE
4276 ])
4278 dnl
4279 dnl Check whether pthread_cond_clockwait is available in <pthread.h> for std::condition_variable to use,
4280 dnl and define _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT.
4281 dnl
4282 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT], [
4284 AC_LANG_SAVE
4285 AC_LANG_CPLUSPLUS
4286 ac_save_CXXFLAGS="$CXXFLAGS"
4287 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4288 ac_save_LIBS="$LIBS"
4289 LIBS="$LIBS -lpthread"
4291 AC_MSG_CHECKING([for pthread_cond_clockwait])
4292 AC_CACHE_VAL(glibcxx_cv_PTHREAD_COND_CLOCKWAIT, [
4293 GCC_TRY_COMPILE_OR_LINK(
4294 [#include <pthread.h>],
4295 [pthread_mutex_t mutex; pthread_cond_t cond; struct timespec ts; int n = pthread_cond_clockwait(&cond, &mutex, 0, &ts);],
4296 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=yes],
4297 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=no])
4298 ])
4299 if test $glibcxx_cv_PTHREAD_COND_CLOCKWAIT = yes; then
4300 AC_DEFINE(_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT, 1, [Define if pthread_cond_clockwait is available in <pthread.h>.])
4301 fi
4302 AC_MSG_RESULT($glibcxx_cv_PTHREAD_COND_CLOCKWAIT)
4304 CXXFLAGS="$ac_save_CXXFLAGS"
4305 LIBS="$ac_save_LIBS"
4306 AC_LANG_RESTORE
4307 ])
4309 dnl
4310 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4311 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4312 dnl
4313 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK], [
4315 AC_LANG_SAVE
4316 AC_LANG_CPLUSPLUS
4317 ac_save_CXXFLAGS="$CXXFLAGS"
4318 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4319 ac_save_LIBS="$LIBS"
4320 LIBS="$LIBS -lpthread"
4322 AC_MSG_CHECKING([for pthread_mutex_clocklock])
4323 AC_CACHE_VAL(glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK, [
4324 GCC_TRY_COMPILE_OR_LINK(
4325 [#include <pthread.h>],
4326 [pthread_mutex_t mutex; struct timespec ts; int n = pthread_mutex_clocklock(&mutex, CLOCK_REALTIME, &ts);],
4327 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=yes],
4328 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=no])
4329 ])
4330 if test $glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK = yes; then
4331 AC_DEFINE(_GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK, 1, [Define if pthread_mutex_clocklock is available in <pthread.h>.])
4332 fi
4333 AC_MSG_RESULT($glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK)
4335 CXXFLAGS="$ac_save_CXXFLAGS"
4336 LIBS="$ac_save_LIBS"
4337 AC_LANG_RESTORE
4338 ])
4340 dnl
4341 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4342 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4343 dnl
4344 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK], [
4346 AC_LANG_SAVE
4347 AC_LANG_CPLUSPLUS
4348 ac_save_CXXFLAGS="$CXXFLAGS"
4349 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4350 ac_save_LIBS="$LIBS"
4351 LIBS="$LIBS -lpthread"
4353 AC_MSG_CHECKING([for pthread_rwlock_clockrdlock, pthread_wlock_clockwrlock])
4354 AC_CACHE_VAL(glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK, [
4355 GCC_TRY_COMPILE_OR_LINK(
4356 [#include <pthread.h>],
4357 [pthread_rwlock_t rwl; struct timespec ts;]
4358 [int n = pthread_rwlock_clockrdlock(&rwl, CLOCK_REALTIME, &ts);]
4359 [int m = pthread_rwlock_clockwrlock(&rwl, CLOCK_REALTIME, &ts);],
4360 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=yes],
4361 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=no])
4362 ])
4363 if test $glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK = yes; then
4364 AC_DEFINE(_GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK, 1, [Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are available in <pthread.h>.])
4365 fi
4366 AC_MSG_RESULT($glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK)
4368 CXXFLAGS="$ac_save_CXXFLAGS"
4369 LIBS="$ac_save_LIBS"
4370 AC_LANG_RESTORE
4371 ])
4373 dnl
4374 dnl Check whether sysctl is available in <pthread.h>, and define _GLIBCXX_USE_SYSCTL_HW_NCPU.
4375 dnl
4376 AC_DEFUN([GLIBCXX_CHECK_SYSCTL_HW_NCPU], [
4378 AC_LANG_SAVE
4379 AC_LANG_CPLUSPLUS
4380 ac_save_CXXFLAGS="$CXXFLAGS"
4381 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4383 AC_MSG_CHECKING([for hw.ncpu sysctl])
4384 AC_CACHE_VAL(glibcxx_cv_SYSCTL_HW_NCPU, [
4385 GCC_TRY_COMPILE_OR_LINK(
4386 [
4387 #include <stddef.h>
4388 #include <sys/sysctl.h>
4389 ],
4390 [
4391 int count;
4392 size_t size = sizeof(count);
4393 int mib[] = { CTL_HW, HW_NCPU };
4394 sysctl(mib, 2, &count, &size, NULL, 0);
4395 ],
4396 [glibcxx_cv_SYSCTL_HW_NCPU=yes],
4397 [glibcxx_cv_SYSCTL_HW_NCPU=no])
4398 ])
4399 if test $glibcxx_cv_SYSCTL_HW_NCPU = yes; then
4400 AC_DEFINE(_GLIBCXX_USE_SYSCTL_HW_NCPU, 1, [Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>.])
4401 fi
4402 AC_MSG_RESULT($glibcxx_cv_SYSCTL_HW_NCPU)
4404 CXXFLAGS="$ac_save_CXXFLAGS"
4405 AC_LANG_RESTORE
4406 ])
4408 dnl
4409 dnl Check to see if python pretty printing can be activated.
4410 dnl
4411 dnl --with-python-dir=dir
4412 dnl installs directory into $prefix/dir
4413 AC_DEFUN([GLIBCXX_ENABLE_PYTHON], [
4415 AC_MSG_CHECKING([for custom python install directory])
4416 AC_ARG_WITH([python-dir],
4417 AS_HELP_STRING([--with-python-dir],
4418 [the location to install Python modules. This path is relative starting from the prefix.]),
4419 [with_python_dir=$withval], [with_python_dir="no"])
4420 AC_MSG_RESULT(${with_python_dir})
4422 # Needed for installing Python modules during make install.
4423 python_mod_dir="${with_python_dir}"
4424 AC_SUBST(python_mod_dir)
4425 GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
4426 ])
4428 dnl
4429 dnl Check to see if -Werror is disabled.
4430 dnl
4431 dnl --enable-werror/--disable-werror
4432 AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
4433 AC_MSG_CHECKING([for -Werror])
4434 GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
4435 AC_MSG_RESULT($enable_werror)
4436 GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
4437 ])
4439 dnl
4440 dnl Check whether obsolescent tmpnam is available in <stdio.h>,
4441 dnl and define _GLIBCXX_USE_TMPNAM.
4442 dnl
4443 AC_DEFUN([GLIBCXX_CHECK_TMPNAM], [dnl
4444 dnl
4445 AC_LANG_SAVE
4446 AC_LANG_CPLUSPLUS
4447 ac_save_CXXFLAGS="$CXXFLAGS"
4448 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4449 dnl
4450 AC_MSG_CHECKING([for tmpnam])
4451 AC_CACHE_VAL(glibcxx_cv_TMPNAM, [dnl
4452 GCC_TRY_COMPILE_OR_LINK(
4453 [#include <stdio.h>],
4454 [char *tmp = tmpnam(NULL);],
4455 [glibcxx_cv_TMPNAM=yes],
4456 [glibcxx_cv_TMPNAM=no])
4457 ])
4458 if test $glibcxx_cv_TMPNAM = yes; then
4459 AC_DEFINE(_GLIBCXX_USE_TMPNAM, 1, [Define if obsolescent tmpnam is available in <stdio.h>.])
4460 fi
4461 AC_MSG_RESULT($glibcxx_cv_TMPNAM)
4462 dnl
4463 CXXFLAGS="$ac_save_CXXFLAGS"
4464 AC_LANG_RESTORE
4465 ])
4467 dnl
4468 dnl Check to see if sys/sdt.h exists and that it is suitable for use.
4469 dnl Some versions of sdt.h were not compatible with C++11.
4470 dnl
4471 AC_DEFUN([GLIBCXX_CHECK_SDT_H], [
4472 AC_MSG_CHECKING([for suitable sys/sdt.h])
4473 # Note that this test has to be run with the C language.
4474 # Otherwise, sdt.h will try to include some headers from
4475 # libstdc++ itself.
4476 AC_LANG_SAVE
4477 AC_LANG_C
4478 AC_CACHE_VAL(glibcxx_cv_sys_sdt_h, [
4479 # Because we have to run the test in C, we use grep rather
4480 # than the compiler to check for the bug. The bug is that
4481 # were strings without trailing whitespace, causing g++
4482 # to look for operator"". The pattern searches for the fixed
4483 # output.
4484 AC_EGREP_CPP([ \",\" ], [
4485 #include <sys/sdt.h>
4486 int f() { STAP_PROBE(hi, bob); }
4487 ], [glibcxx_cv_sys_sdt_h=yes], [glibcxx_cv_sys_sdt_h=no])
4488 ])
4489 AC_LANG_RESTORE
4490 if test $glibcxx_cv_sys_sdt_h = yes; then
4491 AC_DEFINE(HAVE_SYS_SDT_H, 1,
4492 [Define to 1 if you have a suitable <sys/sdt.h> header file])
4493 fi
4494 AC_MSG_RESULT($glibcxx_cv_sys_sdt_h)
4495 ])
4497 dnl
4498 dnl Control whether the library should define symbols for old and new ABIs.
4499 dnl This affects definitions of strings, stringstreams and locale facets.
4500 dnl
4501 dnl --disable-libstdcxx-dual-abi will use old ABI for all types.
4502 dnl
4503 dnl Defines:
4504 dnl _GLIBCXX_USE_DUAL_ABI (always defined, either to 1 or 0)
4505 dnl
4506 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_DUAL_ABI], [
4507 GLIBCXX_ENABLE(libstdcxx-dual-abi,$1,,[support two versions of std::string])
4508 if test x$enable_symvers = xgnu-versioned-namespace; then
4509 # gnu-versioned-namespace is incompatible with the dual ABI.
4510 enable_libstdcxx_dual_abi="no"
4511 fi
4512 if test x"$enable_libstdcxx_dual_abi" != xyes; then
4513 AC_MSG_NOTICE([dual ABI is disabled])
4514 default_libstdcxx_abi="gcc4-compatible"
4515 fi
4516 GLIBCXX_CONDITIONAL(ENABLE_DUAL_ABI, test $enable_libstdcxx_dual_abi = yes)
4517 ])
4519 dnl
4520 dnl Check to see which ABI should be enabled by default.
4521 dnl
4522 dnl --with-default-libstdcxx-abi={gcc4-compatible,new}
4523 dnl
4524 dnl Defines:
4525 dnl _GLIBCXX_USE_CXX11_ABI (always defined, either to 1 or 0)
4526 dnl
4527 AC_DEFUN([GLIBCXX_DEFAULT_ABI], [
4528 if test x$enable_libstdcxx_dual_abi = xyes; then
4529 AC_MSG_CHECKING([for default std::string ABI to use])
4530 AC_ARG_WITH([default-libstdcxx-abi],
4531 AS_HELP_STRING([--with-default-libstdcxx-abi],
4532 [set the std::string ABI to use by default]),
4533 [case "$withval" in
4534 gcc4-compatible) default_libstdcxx_abi="gcc4-compatible" ;;
4535 new|cxx11) default_libstdcxx_abi="new" ;;
4536 c++*|gnu++*) AC_MSG_ERROR([Supported arguments for --with-default-libstdcxx-abi have changed, use "new" or "gcc4-compatible"]) ;;
4537 *) AC_MSG_ERROR([Invalid argument for --with-default-libstdcxx-abi]) ;;
4538 esac
4539 ],
4540 [default_libstdcxx_abi="new"])
4541 AC_MSG_RESULT(${default_libstdcxx_abi})
4542 fi
4543 if test $default_libstdcxx_abi = "new"; then
4544 glibcxx_cxx11_abi=1
4545 glibcxx_cxx98_abi=0
4546 else
4547 glibcxx_cxx11_abi=0
4548 glibcxx_cxx98_abi=1
4549 fi
4550 AC_SUBST(glibcxx_cxx98_abi)
4551 GLIBCXX_CONDITIONAL(ENABLE_CXX11_ABI, test $glibcxx_cxx11_abi = 1)
4552 ])
4554 dnl
4555 dnl Check to see whether to build libstdc++fs.a
4556 dnl
4557 dnl --enable-libstdcxx-filesystem-ts
4558 dnl
4559 AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
4560 GLIBCXX_ENABLE(libstdcxx-filesystem-ts,auto,,
4561 [turns on ISO/IEC TS 18822 support],
4562 [permit yes|no|auto])
4564 AC_MSG_CHECKING([whether to build Filesystem TS support])
4565 if test x"$ac_cv_header_dirent_h" != x"yes"; then
4566 enable_libstdcxx_filesystem_ts=no
4567 fi
4568 if test x"$enable_libstdcxx_filesystem_ts" = x"auto"; then
4569 case "${target_os}" in
4570 freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
4571 enable_libstdcxx_filesystem_ts=yes
4572 ;;
4573 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
4574 enable_libstdcxx_filesystem_ts=yes
4575 ;;
4576 rtems*)
4577 enable_libstdcxx_filesystem_ts=yes
4578 ;;
4579 solaris*)
4580 enable_libstdcxx_filesystem_ts=yes
4581 ;;
4582 mingw*)
4583 enable_libstdcxx_filesystem_ts=yes
4584 ;;
4585 *)
4586 enable_libstdcxx_filesystem_ts=no
4587 ;;
4588 esac
4589 fi
4590 AC_MSG_RESULT($enable_libstdcxx_filesystem_ts)
4591 GLIBCXX_CONDITIONAL(ENABLE_FILESYSTEM_TS, test $enable_libstdcxx_filesystem_ts = yes)
4592 ])
4594 dnl
4595 dnl Check whether the library calls required by the C++17 Filesystem library
4596 dnl and the Filesystem TS are present.
4597 dnl Defines:
4598 dnl HAVE_STRUCT_DIRENT_D_TYPE
4599 dnl _GLIBCXX_USE_REALPATH
4600 dnl _GLIBCXX_USE_UTIMENSAT
4601 dnl _GLIBCXX_USE_ST_MTIM
4602 dnl _GLIBCXX_USE_FCHMOD
4603 dnl _GLIBCXX_USE_FCHMODAT
4604 dnl _GLIBCXX_USE_SENDFILE
4605 dnl HAVE_LINK
4606 dnl HAVE_READLINK
4607 dnl HAVE_SYMLINK
4608 dnl
4609 AC_DEFUN([GLIBCXX_CHECK_FILESYSTEM_DEPS], [dnl
4610 dnl
4611 AC_LANG_SAVE
4612 AC_LANG_CPLUSPLUS
4613 ac_save_CXXFLAGS="$CXXFLAGS"
4614 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4615 dnl
4616 AC_MSG_CHECKING([for struct dirent.d_type])
4617 AC_CACHE_VAL(glibcxx_cv_dirent_d_type, [dnl
4618 GCC_TRY_COMPILE_OR_LINK(
4619 [#include <dirent.h>],
4620 [
4621 struct dirent d;
4622 if (sizeof d.d_type) return 0;
4623 ],
4624 [glibcxx_cv_dirent_d_type=yes],
4625 [glibcxx_cv_dirent_d_type=no])
4626 ])
4627 if test $glibcxx_cv_dirent_d_type = yes; then
4628 AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE, 1, [Define to 1 if `d_type' is a member of `struct dirent'.])
4629 fi
4630 AC_MSG_RESULT($glibcxx_cv_dirent_d_type)
4631 dnl
4632 AC_MSG_CHECKING([for realpath])
4633 AC_CACHE_VAL(glibcxx_cv_realpath, [dnl
4634 GCC_TRY_COMPILE_OR_LINK(
4635 [
4636 #include <limits.h>
4637 #include <stdlib.h>
4638 #include <unistd.h>
4639 ],
4640 [
4641 #if _XOPEN_VERSION < 500
4642 #error
4643 #elif _XOPEN_VERSION >= 700 || defined(PATH_MAX)
4644 char *tmp = realpath((const char*)NULL, (char*)NULL);
4645 #else
4646 #error
4647 #endif
4648 ],
4649 [glibcxx_cv_realpath=yes],
4650 [glibcxx_cv_realpath=no])
4651 ])
4652 if test $glibcxx_cv_realpath = yes; then
4653 AC_DEFINE(_GLIBCXX_USE_REALPATH, 1, [Define if usable realpath is available in <stdlib.h>.])
4654 fi
4655 AC_MSG_RESULT($glibcxx_cv_realpath)
4656 dnl
4657 AC_MSG_CHECKING([for utimensat])
4658 AC_CACHE_VAL(glibcxx_cv_utimensat, [dnl
4659 GCC_TRY_COMPILE_OR_LINK(
4660 [
4661 #include <fcntl.h>
4662 #include <sys/stat.h>
4663 ],
4664 [
4665 struct timespec ts[2] = { { 0, UTIME_OMIT }, { 1, 1 } };
4666 int i = utimensat(AT_FDCWD, "path", ts, 0);
4667 ],
4668 [glibcxx_cv_utimensat=yes],
4669 [glibcxx_cv_utimensat=no])
4670 ])
4671 if test $glibcxx_cv_utimensat = yes; then
4672 AC_DEFINE(_GLIBCXX_USE_UTIMENSAT, 1, [Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and AT_FDCWD in <fcntl.h>.])
4673 fi
4674 AC_MSG_RESULT($glibcxx_cv_utimensat)
4675 dnl
4676 AC_MSG_CHECKING([for utime])
4677 AC_CACHE_VAL(glibcxx_cv_utime, [dnl
4678 GCC_TRY_COMPILE_OR_LINK(
4679 [
4680 #include <utime.h>
4681 ],
4682 [
4683 struct utimbuf t = { 1, 1 };
4684 int i = utime("path", &t);
4685 ],
4686 [glibcxx_cv_utime=yes],
4687 [glibcxx_cv_utime=no])
4688 ])
4689 if test $glibcxx_cv_utime = yes; then
4690 AC_DEFINE(_GLIBCXX_USE_UTIME, 1, [Define if utime is available in <utime.h>.])
4691 fi
4692 AC_MSG_RESULT($glibcxx_cv_utime)
4693 dnl
4694 AC_MSG_CHECKING([for lstat])
4695 AC_CACHE_VAL(glibcxx_cv_lstat, [dnl
4696 GCC_TRY_COMPILE_OR_LINK(
4697 [ #include <sys/stat.h> ],
4698 [
4699 struct stat st;
4700 int i = lstat("path", &st);
4701 ],
4702 [glibcxx_cv_lstat=yes],
4703 [glibcxx_cv_lstat=no])
4704 ])
4705 if test $glibcxx_cv_lstat = yes; then
4706 AC_DEFINE(_GLIBCXX_USE_LSTAT, 1, [Define if lstat is available in <sys/stat.h>.])
4707 fi
4708 AC_MSG_RESULT($glibcxx_cv_lstat)
4709 dnl
4710 AC_MSG_CHECKING([for struct stat.st_mtim.tv_nsec])
4711 AC_CACHE_VAL(glibcxx_cv_st_mtim, [dnl
4712 GCC_TRY_COMPILE_OR_LINK(
4713 [ #include <sys/stat.h> ],
4714 [
4715 struct stat st;
4716 return st.st_mtim.tv_nsec;
4717 ],
4718 [glibcxx_cv_st_mtim=yes],
4719 [glibcxx_cv_st_mtim=no])
4720 ])
4721 if test $glibcxx_cv_st_mtim = yes; then
4722 AC_DEFINE(_GLIBCXX_USE_ST_MTIM, 1, [Define if struct stat has timespec members.])
4723 fi
4724 AC_MSG_RESULT($glibcxx_cv_st_mtim)
4725 dnl
4726 AC_MSG_CHECKING([for fchmod])
4727 AC_CACHE_VAL(glibcxx_cv_fchmod, [dnl
4728 GCC_TRY_COMPILE_OR_LINK(
4729 [#include <sys/stat.h>],
4730 [fchmod(1, S_IWUSR);],
4731 [glibcxx_cv_fchmod=yes],
4732 [glibcxx_cv_fchmod=no])
4733 ])
4734 if test $glibcxx_cv_fchmod = yes; then
4735 AC_DEFINE(_GLIBCXX_USE_FCHMOD, 1, [Define if fchmod is available in <sys/stat.h>.])
4736 fi
4737 AC_MSG_RESULT($glibcxx_cv_fchmod)
4738 dnl
4739 AC_MSG_CHECKING([for fchmodat])
4740 AC_CACHE_VAL(glibcxx_cv_fchmodat, [dnl
4741 GCC_TRY_COMPILE_OR_LINK(
4742 [
4743 #include <fcntl.h>
4744 #include <sys/stat.h>
4745 ],
4746 [fchmodat(AT_FDCWD, "", 0, AT_SYMLINK_NOFOLLOW);],
4747 [glibcxx_cv_fchmodat=yes],
4748 [glibcxx_cv_fchmodat=no])
4749 ])
4750 if test $glibcxx_cv_fchmodat = yes; then
4751 AC_DEFINE(_GLIBCXX_USE_FCHMODAT, 1, [Define if fchmodat is available in <sys/stat.h>.])
4752 fi
4753 AC_MSG_RESULT($glibcxx_cv_fchmodat)
4754 dnl
4755 AC_MSG_CHECKING([for sendfile that can copy files])
4756 AC_CACHE_VAL(glibcxx_cv_sendfile, [dnl
4757 case "${target_os}" in
4758 gnu* | linux* | solaris* | uclinux*)
4759 GCC_TRY_COMPILE_OR_LINK(
4760 [#include <sys/sendfile.h>],
4761 [sendfile(1, 2, (off_t*)0, sizeof 1);],
4762 [glibcxx_cv_sendfile=yes],
4763 [glibcxx_cv_sendfile=no])
4764 ;;
4765 *)
4766 glibcxx_cv_sendfile=no
4767 ;;
4768 esac
4769 ])
4770 if test $glibcxx_cv_sendfile = yes; then
4771 AC_DEFINE(_GLIBCXX_USE_SENDFILE, 1, [Define if sendfile is available in <sys/sendfile.h>.])
4772 fi
4773 AC_MSG_RESULT($glibcxx_cv_sendfile)
4774 dnl
4775 AC_MSG_CHECKING([for link])
4776 AC_CACHE_VAL(glibcxx_cv_link, [dnl
4777 GCC_TRY_COMPILE_OR_LINK(
4778 [#include <unistd.h>],
4779 [link("", "");],
4780 [glibcxx_cv_link=yes],
4781 [glibcxx_cv_link=no])
4782 ])
4783 if test $glibcxx_cv_link = yes; then
4784 AC_DEFINE(HAVE_LINK, 1, [Define if link is available in <unistd.h>.])
4785 fi
4786 AC_MSG_RESULT($glibcxx_cv_link)
4787 dnl
4788 AC_MSG_CHECKING([for readlink])
4789 AC_CACHE_VAL(glibcxx_cv_readlink, [dnl
4790 GCC_TRY_COMPILE_OR_LINK(
4791 [#include <unistd.h>],
4792 [char buf[32]; readlink("", buf, sizeof(buf));],
4793 [glibcxx_cv_readlink=yes],
4794 [glibcxx_cv_readlink=no])
4795 ])
4796 if test $glibcxx_cv_readlink = yes; then
4797 AC_DEFINE(HAVE_READLINK, 1, [Define if readlink is available in <unistd.h>.])
4798 fi
4799 AC_MSG_RESULT($glibcxx_cv_readlink)
4800 dnl
4801 AC_MSG_CHECKING([for symlink])
4802 AC_CACHE_VAL(glibcxx_cv_symlink, [dnl
4803 GCC_TRY_COMPILE_OR_LINK(
4804 [#include <unistd.h>],
4805 [symlink("", "");],
4806 [glibcxx_cv_symlink=yes],
4807 [glibcxx_cv_symlink=no])
4808 ])
4809 if test $glibcxx_cv_symlink = yes; then
4810 AC_DEFINE(HAVE_SYMLINK, 1, [Define if symlink is available in <unistd.h>.])
4811 fi
4812 AC_MSG_RESULT($glibcxx_cv_symlink)
4813 dnl
4814 AC_MSG_CHECKING([for truncate])
4815 AC_CACHE_VAL(glibcxx_cv_truncate, [dnl
4816 GCC_TRY_COMPILE_OR_LINK(
4817 [#include <unistd.h>],
4818 [truncate("", 99);],
4819 [glibcxx_cv_truncate=yes],
4820 [glibcxx_cv_truncate=no])
4821 ])
4822 if test $glibcxx_cv_truncate = yes; then
4823 AC_DEFINE(HAVE_TRUNCATE, 1, [Define if truncate is available in <unistd.h>.])
4824 fi
4825 AC_MSG_RESULT($glibcxx_cv_truncate)
4826 dnl
4827 CXXFLAGS="$ac_save_CXXFLAGS"
4828 AC_LANG_RESTORE
4829 ])
4831 dnl
4832 dnl Check how size_t is mangled. Copied from libitm.
4833 dnl
4834 AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
4835 AC_CACHE_CHECK([how size_t is mangled],
4836 glibcxx_cv_size_t_mangling, [
4837 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
4838 [glibcxx_cv_size_t_mangling=m], [
4839 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
4840 [glibcxx_cv_size_t_mangling=j], [
4841 AC_TRY_COMPILE([],
4842 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
4843 [glibcxx_cv_size_t_mangling=y], [
4844 AC_TRY_COMPILE([],
4845 [extern __SIZE_TYPE__ x; extern unsigned short x;],
4846 [glibcxx_cv_size_t_mangling=t], [
4847 AC_TRY_COMPILE([],
4848 [extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
4849 [glibcxx_cv_size_t_mangling=u6uint20],
4850 [glibcxx_cv_size_t_mangling=x])
4851 ])
4852 ])
4853 ])
4854 ])
4855 ])
4856 if test $glibcxx_cv_size_t_mangling = x; then
4857 AC_MSG_ERROR([Unknown underlying type for size_t])
4858 fi
4859 AC_DEFINE_UNQUOTED(_GLIBCXX_MANGLE_SIZE_T, [$glibcxx_cv_size_t_mangling],
4860 [Define to the letter to which size_t is mangled.])
4861 ])
4863 dnl
4864 dnl Determine whether std::exception_ptr symbols should be exported with
4865 dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
4866 dnl release first added support for std::exception_ptr. Originally it was
4867 dnl only supported for targets with always-lock-free atomics for int, but
4868 dnl since GCC 7.1 it is supported for all targets.
4869 dnl
4870 AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
4871 if test $enable_symvers != no; then
4872 AC_MSG_CHECKING([for first version to support std::exception_ptr])
4873 case ${target} in
4874 aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
4875 m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
4876 ac_exception_ptr_since_gcc46=yes
4877 ;;
4878 *)
4879 # If the value of this macro changes then we will need to hardcode
4880 # yes/no here for additional targets based on the original value.
4881 AC_TRY_COMPILE([], [
4882 #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
4883 # error atomic int not always lock free
4884 #endif
4885 ],
4886 [ac_exception_ptr_since_gcc46=yes],
4887 [ac_exception_ptr_since_gcc46=no])
4888 ;;
4889 esac
4890 if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
4891 AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
4892 [Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
4893 AC_MSG_RESULT([4.6.0])
4894 else
4895 AC_MSG_RESULT([7.1.0])
4896 fi
4897 fi
4898 ])
4900 # Macros from the top-level gcc directory.
4901 m4_include([../config/gc++filt.m4])
4902 m4_include([../config/tls.m4])
4903 m4_include([../config/gthr.m4])
4904 m4_include([../config/cet.m4])