| blob | 016b0c583d050804af5d7192ef9f81dac57b0522 |
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 $host.
32 dnl
33 dnl Sets:
34 dnl SUBDIRS
35 dnl Substs:
36 dnl glibcxx_builddir (absolute path)
37 dnl glibcxx_srcdir (absolute path)
38 dnl toplevel_builddir (absolute path)
39 dnl toplevel_srcdir (absolute path)
40 dnl with_cross_host
41 dnl with_newlib
42 dnl with_target_subdir
43 dnl plus
44 dnl - the variables in GLIBCXX_CHECK_HOST / configure.host
45 dnl - default settings for all AM_CONFITIONAL test variables
46 dnl - lots of tools, like CC and CXX
47 dnl
48 AC_DEFUN([GLIBCXX_CONFIGURE], [
49 # Keep these sync'd with the list in Makefile.am. The first provides an
50 # expandable list at autoconf time; the second provides an expandable list
51 # (i.e., shell variable) at configure time.
52 m4_define([glibcxx_SUBDIRS],[include libsupc++ src src/c++98 src/c++11 src/c++17 src/filesystem doc po testsuite python])
53 SUBDIRS='glibcxx_SUBDIRS'
55 # These need to be absolute paths, yet at the same time need to
56 # canonicalize only relative paths, because then amd will not unmount
57 # drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
58 glibcxx_builddir=`${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"$with_gnu_ld" = x"yes"; then
276 AC_MSG_CHECKING([for ld that supports -Wl,-z,relro])
277 cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
278 if test -n "$cxx_z_relo"; then
279 OPT_LDFLAGS="-Wl,-z,relro"
280 ac_ld_relro=yes
281 fi
282 AC_MSG_RESULT($ac_ld_relro)
283 fi
285 # Set linker optimization flags.
286 if test x"$with_gnu_ld" = x"yes"; then
287 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
288 fi
290 AC_SUBST(SECTION_LDFLAGS)
291 AC_SUBST(OPT_LDFLAGS)
292 ])
295 dnl
296 dnl Check for headers for, and arguments to, the setrlimit() function.
297 dnl Used only in testsuite_hooks.h. Called from GLIBCXX_CONFIGURE_TESTSUITE.
298 dnl
299 dnl Defines:
300 dnl _GLIBCXX_RES_LIMITS if we can set artificial resource limits
301 dnl various HAVE_LIMIT_* for individual limit names
302 dnl
303 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT_ancilliary], [
304 AC_MSG_CHECKING([for RLIMIT_$1])
305 AC_TRY_COMPILE(
306 [#include <unistd.h>
307 #include <sys/time.h>
308 #include <sys/resource.h>
309 ],
310 [ int f = RLIMIT_$1 ; ],
311 [glibcxx_mresult=1], [glibcxx_mresult=0])
312 AC_DEFINE_UNQUOTED(HAVE_LIMIT_$1, $glibcxx_mresult,
313 [Only used in build directory testsuite_hooks.h.])
314 if test $glibcxx_mresult = 1 ; then res=yes ; else res=no ; fi
315 AC_MSG_RESULT($res)
316 ])
318 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT], [
319 setrlimit_have_headers=yes
320 AC_CHECK_HEADERS(unistd.h sys/time.h sys/resource.h,
321 [],
322 [setrlimit_have_headers=no])
323 # If don't have the headers, then we can't run the tests now, and we
324 # won't be seeing any of these during testsuite compilation.
325 if test $setrlimit_have_headers = yes; then
326 # Can't do these in a loop, else the resulting syntax is wrong.
327 GLIBCXX_CHECK_SETRLIMIT_ancilliary(DATA)
328 GLIBCXX_CHECK_SETRLIMIT_ancilliary(RSS)
329 GLIBCXX_CHECK_SETRLIMIT_ancilliary(VMEM)
330 GLIBCXX_CHECK_SETRLIMIT_ancilliary(AS)
331 GLIBCXX_CHECK_SETRLIMIT_ancilliary(FSIZE)
333 # Check for rlimit, setrlimit.
334 AC_CACHE_VAL(glibcxx_cv_setrlimit, [
335 AC_TRY_COMPILE(
336 [#include <unistd.h>
337 #include <sys/time.h>
338 #include <sys/resource.h>
339 ],
340 [struct rlimit r;
341 setrlimit(0, &r);],
342 [glibcxx_cv_setrlimit=yes], [glibcxx_cv_setrlimit=no])
343 ])
344 fi
346 AC_MSG_CHECKING([for testsuite resource limits support])
347 if test $setrlimit_have_headers = yes && test $glibcxx_cv_setrlimit = yes; then
348 ac_res_limits=yes
349 AC_DEFINE(_GLIBCXX_RES_LIMITS, 1,
350 [Define if using setrlimit to set resource limits during
351 "make check"])
352 else
353 ac_res_limits=no
354 fi
355 AC_MSG_RESULT($ac_res_limits)
356 ])
359 dnl
360 dnl Check whether S_ISREG (Posix) or S_IFREG is available in <sys/stat.h>.
361 dnl Define HAVE_S_ISREG / HAVE_S_IFREG appropriately.
362 dnl
363 AC_DEFUN([GLIBCXX_CHECK_S_ISREG_OR_S_IFREG], [
365 AC_LANG_SAVE
366 AC_LANG_CPLUSPLUS
367 ac_save_CXXFLAGS="$CXXFLAGS"
368 CXXFLAGS="$CXXFLAGS -fno-exceptions"
370 AC_MSG_CHECKING([for S_ISREG or S_IFREG])
371 AC_CACHE_VAL(glibcxx_cv_S_ISREG, [
372 GCC_TRY_COMPILE_OR_LINK(
373 [#include <sys/stat.h>],
374 [struct stat buffer;
375 fstat(0, &buffer);
376 S_ISREG(buffer.st_mode);],
377 [glibcxx_cv_S_ISREG=yes],
378 [glibcxx_cv_S_ISREG=no])
379 ])
380 AC_CACHE_VAL(glibcxx_cv_S_IFREG, [
381 GCC_TRY_COMPILE_OR_LINK(
382 [#include <sys/stat.h>],
383 [struct stat buffer;
384 fstat(0, &buffer);
385 S_IFREG & buffer.st_mode;],
386 [glibcxx_cv_S_IFREG=yes],
387 [glibcxx_cv_S_IFREG=no])
388 ])
389 res=no
390 if test $glibcxx_cv_S_ISREG = yes; then
391 AC_DEFINE(HAVE_S_ISREG, 1,
392 [Define if S_ISREG is available in <sys/stat.h>.])
393 res=S_ISREG
394 elif test $glibcxx_cv_S_IFREG = yes; then
395 AC_DEFINE(HAVE_S_IFREG, 1,
396 [Define if S_IFREG is available in <sys/stat.h>.])
397 res=S_IFREG
398 fi
399 AC_MSG_RESULT($res)
401 CXXFLAGS="$ac_save_CXXFLAGS"
402 AC_LANG_RESTORE
403 ])
406 dnl
407 dnl Check whether poll is available in <poll.h>, and define HAVE_POLL.
408 dnl
409 AC_DEFUN([GLIBCXX_CHECK_POLL], [
411 AC_LANG_SAVE
412 AC_LANG_CPLUSPLUS
413 ac_save_CXXFLAGS="$CXXFLAGS"
414 CXXFLAGS="$CXXFLAGS -fno-exceptions"
416 AC_MSG_CHECKING([for poll])
417 AC_CACHE_VAL(glibcxx_cv_POLL, [
418 GCC_TRY_COMPILE_OR_LINK(
419 [#include <poll.h>],
420 [struct pollfd pfd[1];
421 pfd[0].events = POLLIN;
422 poll(pfd, 1, 0);],
423 [glibcxx_cv_POLL=yes],
424 [glibcxx_cv_POLL=no])
425 ])
426 if test $glibcxx_cv_POLL = yes; then
427 AC_DEFINE(HAVE_POLL, 1, [Define if poll is available in <poll.h>.])
428 fi
429 AC_MSG_RESULT($glibcxx_cv_POLL)
431 CXXFLAGS="$ac_save_CXXFLAGS"
432 AC_LANG_RESTORE
433 ])
436 dnl
437 dnl Check whether writev is available in <sys/uio.h>, and define HAVE_WRITEV.
438 dnl
439 AC_DEFUN([GLIBCXX_CHECK_WRITEV], [
441 AC_LANG_SAVE
442 AC_LANG_CPLUSPLUS
443 ac_save_CXXFLAGS="$CXXFLAGS"
444 CXXFLAGS="$CXXFLAGS -fno-exceptions"
446 AC_MSG_CHECKING([for writev])
447 AC_CACHE_VAL(glibcxx_cv_WRITEV, [
448 GCC_TRY_COMPILE_OR_LINK(
449 [#include <sys/uio.h>],
450 [struct iovec iov[2];
451 writev(0, iov, 0);],
452 [glibcxx_cv_WRITEV=yes],
453 [glibcxx_cv_WRITEV=no])
454 ])
455 if test $glibcxx_cv_WRITEV = yes; then
456 AC_DEFINE(HAVE_WRITEV, 1, [Define if writev is available in <sys/uio.h>.])
457 fi
458 AC_MSG_RESULT($glibcxx_cv_WRITEV)
460 CXXFLAGS="$ac_save_CXXFLAGS"
461 AC_LANG_RESTORE
462 ])
465 dnl
466 dnl Check whether int64_t is available in <stdint.h>, and define HAVE_INT64_T.
467 dnl Also check whether int64_t is actually a typedef to long or long long.
468 dnl
469 AC_DEFUN([GLIBCXX_CHECK_INT64_T], [
471 AC_LANG_SAVE
472 AC_LANG_CPLUSPLUS
474 AC_MSG_CHECKING([for int64_t])
475 AC_CACHE_VAL(glibcxx_cv_INT64_T, [
476 AC_TRY_COMPILE(
477 [#include <stdint.h>],
478 [int64_t var;],
479 [glibcxx_cv_INT64_T=yes],
480 [glibcxx_cv_INT64_T=no])
481 ])
483 if test $glibcxx_cv_INT64_T = yes; then
484 AC_DEFINE(HAVE_INT64_T, 1, [Define if int64_t is available in <stdint.h>.])
485 AC_MSG_RESULT($glibcxx_cv_INT64_T)
487 AC_MSG_CHECKING([for int64_t as long])
488 AC_CACHE_VAL(glibcxx_cv_int64_t_long, [
489 AC_TRY_COMPILE(
490 [#include <stdint.h>
491 template<typename, typename> struct same { enum { value = -1 }; };
492 template<typename Tp> struct same<Tp, Tp> { enum { value = 1 }; };
493 int array[same<int64_t, long>::value];], [],
494 [glibcxx_cv_int64_t_long=yes], [glibcxx_cv_int64_t_long=no])
495 ])
497 if test $glibcxx_cv_int64_t_long = yes; then
498 AC_DEFINE(HAVE_INT64_T_LONG, 1, [Define if int64_t is a long.])
499 AC_MSG_RESULT($glibcxx_cv_int64_t_long)
500 fi
502 AC_MSG_CHECKING([for int64_t as long long])
503 AC_CACHE_VAL(glibcxx_cv_int64_t_long_long, [
504 AC_TRY_COMPILE(
505 [#include <stdint.h>
506 template<typename, typename> struct same { enum { value = -1 }; };
507 template<typename Tp> struct same<Tp, Tp> { enum { value = 1 }; };
508 int array[same<int64_t, long long>::value];], [],
509 [glibcxx_cv_int64_t_long_long=yes], [glibcxx_cv_int64_t_long_long=no])
510 ])
512 if test $glibcxx_cv_int64_t_long_long = yes; then
513 AC_DEFINE(HAVE_INT64_T_LONG_LONG, 1, [Define if int64_t is a long long.])
514 AC_MSG_RESULT($glibcxx_cv_int64_t_long_long)
515 fi
516 fi
518 AC_LANG_RESTORE
519 ])
522 dnl
523 dnl Check whether LFS support is available.
524 dnl
525 AC_DEFUN([GLIBCXX_CHECK_LFS], [
526 AC_LANG_SAVE
527 AC_LANG_CPLUSPLUS
528 ac_save_CXXFLAGS="$CXXFLAGS"
529 CXXFLAGS="$CXXFLAGS -fno-exceptions"
530 AC_MSG_CHECKING([for LFS support])
531 AC_CACHE_VAL(glibcxx_cv_LFS, [
532 GCC_TRY_COMPILE_OR_LINK(
533 [#include <unistd.h>
534 #include <stdio.h>
535 #include <sys/stat.h>
536 ],
537 [FILE* fp;
538 fopen64("t", "w");
539 fseeko64(fp, 0, SEEK_CUR);
540 ftello64(fp);
541 lseek64(1, 0, SEEK_CUR);
542 struct stat64 buf;
543 fstat64(1, &buf);],
544 [glibcxx_cv_LFS=yes],
545 [glibcxx_cv_LFS=no])
546 ])
547 if test $glibcxx_cv_LFS = yes; then
548 AC_DEFINE(_GLIBCXX_USE_LFS, 1, [Define if LFS support is available.])
549 fi
550 AC_MSG_RESULT($glibcxx_cv_LFS)
551 CXXFLAGS="$ac_save_CXXFLAGS"
552 AC_LANG_RESTORE
553 ])
556 dnl
557 dnl Check for whether a fully dynamic basic_string implementation should
558 dnl be turned on, that does not put empty objects in per-process static
559 dnl memory (mostly useful together with shared memory allocators, see PR
560 dnl libstdc++/16612 for details).
561 dnl
562 dnl --enable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 1
563 dnl --disable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 0
564 dnl otherwise undefined
565 dnl + Usage: GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING[(DEFAULT)]
566 dnl Where DEFAULT is either `yes' or `no'.
567 dnl
568 AC_DEFUN([GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING], [
569 GLIBCXX_ENABLE(fully-dynamic-string,$1,,[do not put empty strings in per-process static memory])
570 if test $enable_fully_dynamic_string = yes; then
571 enable_fully_dynamic_string_def=1
572 else
573 enable_fully_dynamic_string_def=0
574 fi
575 AC_DEFINE_UNQUOTED([_GLIBCXX_FULLY_DYNAMIC_STRING], [${enable_fully_dynamic_string_def}],
576 [Define to 1 if a fully dynamic basic_string is wanted, 0 to disable, undefined for platform defaults])
577 ])
580 dnl
581 dnl Does any necessary configuration of the testsuite directory. Generates
582 dnl the testsuite_hooks.h header.
583 dnl
584 dnl GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE must be done before this.
585 dnl
586 dnl Sets:
587 dnl enable_abi_check
588 dnl GLIBCXX_TEST_WCHAR_T
589 dnl GLIBCXX_TEST_THREAD
590 dnl Substs:
591 dnl baseline_dir
592 dnl baseline_subdir_switch
593 dnl
594 AC_DEFUN([GLIBCXX_CONFIGURE_TESTSUITE], [
595 # Do checks for resource limit functions.
596 GLIBCXX_CHECK_SETRLIMIT
598 if $GLIBCXX_IS_NATIVE ; then
599 # Look for setenv, so that extended locale tests can be performed.
600 GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_3(setenv)
601 fi
603 if $GLIBCXX_IS_NATIVE && test $is_hosted = yes &&
604 test $enable_symvers != no; then
605 case "$host" in
606 *-*-cygwin*)
607 enable_abi_check=no ;;
608 *)
609 enable_abi_check=yes ;;
610 esac
611 else
612 # Only build this as native, since automake does not understand
613 # CXX_FOR_BUILD.
614 enable_abi_check=no
615 fi
617 # Export file names for ABI checking.
618 baseline_dir="$glibcxx_srcdir/config/abi/post/${abi_baseline_pair}"
619 AC_SUBST(baseline_dir)
620 baseline_subdir_switch="$abi_baseline_subdir_switch"
621 AC_SUBST(baseline_subdir_switch)
622 ])
625 dnl
626 dnl Does any necessary configuration for docbook in the docs directory.
627 dnl
628 dnl XSLTPROC must be set before this
629 dnl
630 dnl Sets:
631 dnl glibcxx_stylesheets
632 dnl Substs:
633 dnl XSL_STYLE_DIR
634 dnl
635 AC_DEFUN([GLIBCXX_CONFIGURE_DOCBOOK], [
637 glibcxx_docbook_url=http://docbook.sourceforge.net/release/xsl-ns/current/
639 AC_MSG_CHECKING([for local stylesheet directory])
640 glibcxx_local_stylesheets=no
641 if test x${XMLCATALOG} = xyes && xsl_style_dir=`xmlcatalog "" $glibcxx_docbook_url 2>/dev/null`
642 then
643 XSL_STYLE_DIR=`echo $xsl_style_dir | sed -n 's;^file://;;p'`
644 glibcxx_local_stylesheets=yes
645 else
646 for dir in \
647 /usr/share/sgml/docbook/xsl-ns-stylesheets \
648 /usr/share/xml/docbook/stylesheet/docbook-xsl-ns \
649 /usr/share/xml/docbook/stylesheet/nwalsh5/current \
650 /usr/share/xml/docbook/stylesheet/nwalsh/current
651 do
652 if test -d $dir; then
653 glibcxx_local_stylesheets=yes
654 XSL_STYLE_DIR=$dir
655 break
656 fi
657 done
658 fi
659 AC_MSG_RESULT($glibcxx_local_stylesheets)
661 if test x"$glibcxx_local_stylesheets" = x"yes"; then
662 AC_SUBST(XSL_STYLE_DIR)
663 AC_MSG_NOTICE($XSL_STYLE_DIR)
665 AC_MSG_CHECKING([for docbook stylesheets for documentation creation])
666 glibcxx_stylesheets=no
667 if test x${XMLCATALOG} = xno || xmlcatalog "" $glibcxx_docbook_url/xhtml/docbook.xsl >/dev/null 2>&1; then
668 if test x${XSLTPROC} = xyes && echo '<title/>' | xsltproc --noout --nonet --xinclude $glibcxx_docbook_url/xhtml/docbook.xsl - 2>/dev/null; then
669 glibcxx_stylesheets=yes
670 fi
671 fi
672 AC_MSG_RESULT($glibcxx_stylesheets)
674 else
675 glibcxx_stylesheets=no
676 fi
678 # Check for epub3 dependencies.
679 AC_MSG_CHECKING([for epub3 stylesheets for documentation creation])
680 glibcxx_epub_stylesheets=no
681 if test x"$glibcxx_local_stylesheets" = x"yes"; then
682 if test -f "$XSL_STYLE_DIR/epub3/chunk.xsl"; then
683 glibcxx_epub_stylesheets=yes
684 fi
685 fi
686 AC_MSG_RESULT($glibcxx_epub_stylesheets)
687 AM_CONDITIONAL(BUILD_EPUB, test x"$glibcxx_epub_stylesheets" = x"yes")
689 ])
692 dnl
693 dnl Set up *_INCLUDES variables for all sundry Makefile.am's.
694 dnl
695 dnl Substs:
696 dnl GLIBCXX_INCLUDES
697 dnl TOPLEVEL_INCLUDES
698 dnl
699 AC_DEFUN([GLIBCXX_EXPORT_INCLUDES], [
700 # Used for every C++ compile we perform.
701 GLIBCXX_INCLUDES="\
702 -I$glibcxx_builddir/include/$host_alias \
703 -I$glibcxx_builddir/include \
704 -I$glibcxx_srcdir/libsupc++"
706 # For Canadian crosses, pick this up too.
707 if test $CANADIAN = yes; then
708 GLIBCXX_INCLUDES="$GLIBCXX_INCLUDES -I\${includedir}"
709 fi
711 # Stuff in the actual top level. Currently only used by libsupc++ to
712 # get unwind* headers from the libgcc dir.
713 #TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc -I$(toplevel_srcdir)/include'
714 TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc'
716 # Now, export this to all the little Makefiles....
717 AC_SUBST(GLIBCXX_INCLUDES)
718 AC_SUBST(TOPLEVEL_INCLUDES)
719 ])
722 dnl
723 dnl Set up *_FLAGS and *FLAGS variables for all sundry Makefile.am's.
724 dnl (SECTION_FLAGS is done under CHECK_COMPILER_FEATURES.)
725 dnl
726 dnl Substs:
727 dnl OPTIMIZE_CXXFLAGS
728 dnl WARN_FLAGS
729 dnl
730 AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
731 # Optimization flags that are probably a good idea for thrill-seekers. Just
732 # uncomment the lines below and make, everything else is ready to go...
733 # Alternatively OPTIMIZE_CXXFLAGS can be set in configure.host.
734 # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
735 AC_SUBST(OPTIMIZE_CXXFLAGS)
737 WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
738 AC_SUBST(WARN_FLAGS)
739 ])
742 dnl
743 dnl All installation directory information is determined here.
744 dnl
745 dnl Substs:
746 dnl gxx_install_dir
747 dnl glibcxx_prefixdir
748 dnl glibcxx_toolexecdir
749 dnl glibcxx_toolexeclibdir
750 dnl
751 dnl Assumes cross_compiling bits already done, and with_cross_host in
752 dnl particular.
753 dnl
754 dnl This logic must match gcc/configure.ac's setting of gcc_gxx_include_dir.
755 dnl config/gxx-include-dir.m4 must be kept consistant with this as well.
756 AC_DEFUN([GLIBCXX_EXPORT_INSTALL_INFO], [
757 glibcxx_toolexecdir=no
758 glibcxx_toolexeclibdir=no
759 glibcxx_prefixdir=$prefix
761 AC_MSG_CHECKING([for gxx-include-dir])
762 AC_ARG_WITH([gxx-include-dir],
763 AC_HELP_STRING([--with-gxx-include-dir=DIR],
764 [installation directory for include files]),
765 [case "$withval" in
766 yes) AC_MSG_ERROR([Missing directory for --with-gxx-include-dir]) ;;
767 no) gxx_include_dir=no ;;
768 *) gxx_include_dir=$withval ;;
769 esac],
770 [gxx_include_dir=no])
771 AC_MSG_RESULT($gxx_include_dir)
773 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
774 AC_ARG_ENABLE([version-specific-runtime-libs],
775 AC_HELP_STRING([--enable-version-specific-runtime-libs],
776 [Specify that runtime libraries should be installed in a compiler-specific directory]),
777 [case "$enableval" in
778 yes) version_specific_libs=yes ;;
779 no) version_specific_libs=no ;;
780 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
781 esac],
782 [version_specific_libs=no])
783 AC_MSG_RESULT($version_specific_libs)
785 # Default case for install directory for include files.
786 if test $version_specific_libs = no && test $gxx_include_dir = no; then
787 gxx_include_dir='include/c++/${gcc_version}'
788 if test -n "$with_cross_host" &&
789 test x"$with_cross_host" != x"no"; then
790 gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"
791 else
792 gxx_include_dir='${prefix}/'"$gxx_include_dir"
793 fi
794 fi
796 # Version-specific runtime libs processing.
797 if test $version_specific_libs = yes; then
798 # Need the gcc compiler version to know where to install libraries
799 # and header files if --enable-version-specific-runtime-libs option
800 # is selected. FIXME: these variables are misnamed, there are
801 # no executables installed in _toolexecdir or _toolexeclibdir.
802 if test x"$gxx_include_dir" = x"no"; then
803 gxx_include_dir='${libdir}/gcc/${host_alias}/${gcc_version}/include/c++'
804 fi
805 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
806 glibcxx_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
807 fi
809 # Calculate glibcxx_toolexecdir, glibcxx_toolexeclibdir
810 # Install a library built with a cross compiler in tooldir, not libdir.
811 if test x"$glibcxx_toolexecdir" = x"no"; then
812 if test -n "$with_cross_host" &&
813 test x"$with_cross_host" != x"no"; then
814 glibcxx_toolexecdir='${exec_prefix}/${host_alias}'
815 glibcxx_toolexeclibdir='${toolexecdir}/lib'
816 else
817 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
818 glibcxx_toolexeclibdir='${libdir}'
819 fi
820 multi_os_directory=`$CXX -print-multi-os-directory`
821 case $multi_os_directory in
822 .) ;; # Avoid trailing /.
823 *) glibcxx_toolexeclibdir=$glibcxx_toolexeclibdir/$multi_os_directory ;;
824 esac
825 fi
827 AC_MSG_CHECKING([for install location])
828 AC_MSG_RESULT($gxx_include_dir)
830 AC_SUBST(glibcxx_prefixdir)
831 AC_SUBST(gxx_include_dir)
832 AC_SUBST(glibcxx_toolexecdir)
833 AC_SUBST(glibcxx_toolexeclibdir)
834 ])
837 dnl
838 dnl GLIBCXX_ENABLE
839 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
840 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
841 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
842 dnl
843 dnl See manual/appendix_porting.html#appendix.porting.build_hacking for
844 dnl documentation.
845 dnl
846 m4_define([GLIBCXX_ENABLE],[dnl
847 m4_define([_g_switch],[--enable-$1])dnl
848 m4_define([_g_help],[AC_HELP_STRING([_g_switch$3],[$4 @<:@default=$2@:>@])])dnl
849 AC_ARG_ENABLE([$1],m4_dquote(_g_help),
850 m4_bmatch([$5],
851 [^permit ],
852 [[
853 case "$enableval" in
854 m4_bpatsubst([$5],[permit ])) ;;
855 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
856 dnl Idea for future: generate a URL pointing to
857 dnl "onlinedocs/configopts.html#whatever"
858 esac
859 ]],
860 [^$],
861 [[
862 case "$enableval" in
863 yes|no) ;;
864 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
865 esac
866 ]],
867 [[$5]]),
868 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
869 m4_undefine([_g_switch])dnl
870 m4_undefine([_g_help])dnl
871 ])
874 dnl
875 dnl Check for ISO/IEC 9899:1999 "C99" support.
876 dnl
877 dnl --enable-c99 defines _GLIBCXX_USE_C99
878 dnl --disable-c99 leaves _GLIBCXX_USE_C99 undefined
879 dnl + Usage: GLIBCXX_ENABLE_C99[(DEFAULT)]
880 dnl Where DEFAULT is either `yes' or `no'.
881 dnl + If 'C99' stuff is not available, ignores DEFAULT and sets `no'.
882 dnl
883 AC_DEFUN([GLIBCXX_ENABLE_C99], [
884 GLIBCXX_ENABLE(c99,$1,,[turns on ISO/IEC 9899:1999 support])
886 if test x"$enable_c99" = x"yes"; then
887 AC_LANG_SAVE
888 AC_LANG_CPLUSPLUS
890 # Use -std=c++98 (instead of -std=gnu++98) because leaving __STRICT_ANSI__
891 # undefined may cause fake C99 facilities, like pre-standard snprintf,
892 # to be spuriously enabled.
893 ac_save_CXXFLAGS="$CXXFLAGS"
894 CXXFLAGS="$CXXFLAGS -std=c++98"
895 ac_save_LIBS="$LIBS"
896 ac_save_gcc_no_link="$gcc_no_link"
898 if test x$gcc_no_link != xyes; then
899 # Use -fno-exceptions to that the C driver can link these tests without
900 # hitting undefined references to personality routines.
901 CXXFLAGS="$CXXFLAGS -fno-exceptions"
902 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
903 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
904 gcc_no_link=yes
905 ])
906 fi
908 # Check for the existence of <math.h> functions used if C99 is enabled.
909 AC_MSG_CHECKING([for ISO C99 support in <math.h> for C++98])
910 AC_CACHE_VAL(glibcxx_cv_c99_math_cxx98, [
911 GCC_TRY_COMPILE_OR_LINK(
912 [#include <math.h>
913 volatile double d1, d2;
914 volatile int i;],
915 [i = fpclassify(d1);
916 i = isfinite(d1);
917 i = isinf(d1);
918 i = isnan(d1);
919 i = isnormal(d1);
920 i = signbit(d1);
921 i = isgreater(d1, d2);
922 i = isgreaterequal(d1, d2);
923 i = isless(d1, d2);
924 i = islessequal(d1, d2);
925 i = islessgreater(d1, d2);
926 i = islessgreater(d1, d2);
927 i = isunordered(d1, d2);
928 ], [glibcxx_cv_c99_math_cxx98=yes], [glibcxx_cv_c99_math_cxx98=no])
929 ])
930 AC_MSG_RESULT($glibcxx_cv_c99_math_cxx98)
931 if test x"$glibcxx_cv_c99_math_cxx98" = x"yes"; then
932 AC_DEFINE(_GLIBCXX98_USE_C99_MATH, 1,
933 [Define if C99 functions or macros in <math.h> should be imported
934 in <cmath> in namespace std for C++98.])
935 fi
937 # Check for the existence of <complex.h> complex math functions.
938 # This is necessary even though libstdc++ uses the builtin versions
939 # of these functions, because if the builtin cannot be used, a reference
940 # to the library function is emitted.
941 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
942 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
943 if test x"$ac_has_complex_h" = x"yes"; then
944 AC_MSG_CHECKING([for ISO C99 support in <complex.h> for C++98])
945 AC_CACHE_VAL(glibcxx_cv_c99_complex_cxx98, [
946 GCC_TRY_COMPILE_OR_LINK(
947 [#include <complex.h>
948 typedef __complex__ float float_type;
949 typedef __complex__ double double_type;
950 typedef __complex__ long double ld_type;
951 volatile float_type tmpf;
952 volatile double_type tmpd;
953 volatile ld_type tmpld;
954 volatile float f;
955 volatile double d;
956 volatile long double ld;],
957 [f = cabsf(tmpf);
958 f = cargf(tmpf);
959 tmpf = ccosf(tmpf);
960 tmpf = ccoshf(tmpf);
961 tmpf = cexpf(tmpf);
962 tmpf = clogf(tmpf);
963 tmpf = csinf(tmpf);
964 tmpf = csinhf(tmpf);
965 tmpf = csqrtf(tmpf);
966 tmpf = ctanf(tmpf);
967 tmpf = ctanhf(tmpf);
968 tmpf = cpowf(tmpf, tmpf);
969 tmpf = cprojf(tmpf);
970 d = cabs(tmpd);
971 d = carg(tmpd);
972 tmpd = ccos(tmpd);
973 tmpd = ccosh(tmpd);
974 tmpd = cexp(tmpd);
975 tmpd = clog(tmpd);
976 tmpd = csin(tmpd);
977 tmpd = csinh(tmpd);
978 tmpd = csqrt(tmpd);
979 tmpd = ctan(tmpd);
980 tmpd = ctanh(tmpd);
981 tmpd = cpow(tmpd, tmpd);
982 tmpd = cproj(tmpd);
983 ld = cabsl(tmpld);
984 ld = cargl(tmpld);
985 tmpld = ccosl(tmpld);
986 tmpld = ccoshl(tmpld);
987 tmpld = cexpl(tmpld);
988 tmpld = clogl(tmpld);
989 tmpld = csinl(tmpld);
990 tmpld = csinhl(tmpld);
991 tmpld = csqrtl(tmpld);
992 tmpld = ctanl(tmpld);
993 tmpld = ctanhl(tmpld);
994 tmpld = cpowl(tmpld, tmpld);
995 tmpld = cprojl(tmpld);
996 ], [glibcxx_cv_c99_complex_cxx98=yes], [glibcxx_cv_c99_complex_cxx98=no])
997 ])
998 fi
999 AC_MSG_RESULT($glibcxx_cv_c99_complex_cxx98)
1000 if test x"$glibcxx_cv_c99_complex_cxx98" = x"yes"; then
1001 AC_DEFINE(_GLIBCXX98_USE_C99_COMPLEX, 1,
1002 [Define if C99 functions in <complex.h> should be used in
1003 <complex> for C++98. Using compiler builtins for these functions
1004 requires corresponding C99 library functions to be present.])
1005 fi
1007 # Check for the existence in <stdio.h> of vscanf, et. al.
1008 AC_MSG_CHECKING([for ISO C99 support in <stdio.h> for C++98])
1009 AC_CACHE_VAL(glibcxx_cv_c99_stdio_cxx98, [
1010 GCC_TRY_COMPILE_OR_LINK(
1011 [#include <stdio.h>
1012 #include <stdarg.h>
1013 void foo(char* fmt, ...)
1014 {
1015 va_list args; va_start(args, fmt);
1016 vfscanf(stderr, "%i", args);
1017 vscanf("%i", args);
1018 vsnprintf(fmt, 0, "%i", args);
1019 vsscanf(fmt, "%i", args);
1020 snprintf(fmt, 0, "%i");
1021 }], [],
1022 [glibcxx_cv_c99_stdio_cxx98=yes], [glibcxx_cv_c99_stdio_cxx98=no])
1023 ])
1024 AC_MSG_RESULT($glibcxx_cv_c99_stdio_cxx98)
1025 if test x"$glibcxx_cv_c99_stdio_cxx98" = x"yes"; then
1026 AC_DEFINE(_GLIBCXX98_USE_C99_STDIO, 1,
1027 [Define if C99 functions or macros in <stdio.h> should be imported
1028 in <cstdio> in namespace std for C++98.])
1029 fi
1031 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
1032 AC_MSG_CHECKING([for ISO C99 support in <stdlib.h> for C++98])
1033 AC_CACHE_VAL(glibcxx_cv_c99_stdlib_cxx98, [
1034 GCC_TRY_COMPILE_OR_LINK(
1035 [#include <stdlib.h>
1036 volatile float f;
1037 volatile long double ld;
1038 volatile unsigned long long ll;
1039 lldiv_t mydivt;],
1040 [char* tmp;
1041 f = strtof("gnu", &tmp);
1042 ld = strtold("gnu", &tmp);
1043 ll = strtoll("gnu", &tmp, 10);
1044 ll = strtoull("gnu", &tmp, 10);
1045 ll = llabs(10);
1046 mydivt = lldiv(10,1);
1047 ll = mydivt.quot;
1048 ll = mydivt.rem;
1049 ll = atoll("10");
1050 _Exit(0);
1051 ], [glibcxx_cv_c99_stdlib_cxx98=yes], [glibcxx_cv_c99_stdlib_cxx98=no])
1052 ])
1053 AC_MSG_RESULT($glibcxx_cv_c99_stdlib_cxx98)
1054 if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
1055 AC_DEFINE(_GLIBCXX98_USE_C99_STDLIB, 1,
1056 [Define if C99 functions or macros in <stdlib.h> should be imported
1057 in <cstdlib> in namespace std for C++98.])
1058 fi
1060 # Check for the existence in <wchar.h> of wcstold, etc.
1061 if test x"$ac_has_wchar_h" = xyes &&
1062 test x"$ac_has_wctype_h" = xyes; then
1063 AC_MSG_CHECKING([for ISO C99 support in <wchar.h> for C++98])
1064 AC_CACHE_VAL(glibcxx_cv_c99_wchar_cxx98, [
1065 AC_TRY_COMPILE([#include <wchar.h>
1066 namespace test
1067 {
1068 using ::wcstold;
1069 using ::wcstoll;
1070 using ::wcstoull;
1071 }
1072 ], [], [glibcxx_cv_c99_wchar_cxx98=yes], [glibcxx_cv_c99_wchar_cxx98=no])
1073 ])
1075 # Checks for wide character functions that may not be present.
1076 # Injection of these is wrapped with guard macros.
1077 # NB: only put functions here, instead of immediately above, if
1078 # absolutely necessary.
1079 AC_TRY_COMPILE([#include <wchar.h>
1080 namespace test { using ::vfwscanf; }], [],
1081 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1083 AC_TRY_COMPILE([#include <wchar.h>
1084 namespace test { using ::vswscanf; }], [],
1085 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1087 AC_TRY_COMPILE([#include <wchar.h>
1088 namespace test { using ::vwscanf; }], [],
1089 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1091 AC_TRY_COMPILE([#include <wchar.h>
1092 namespace test { using ::wcstof; }], [],
1093 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1095 AC_TRY_COMPILE([#include <wctype.h>],
1096 [wint_t t; int i = iswblank(t);],
1097 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1099 AC_MSG_RESULT($glibcxx_cv_c99_wchar_cxx98)
1100 if test x"$glibcxx_cv_c99_wchar_cxx98" = x"yes"; then
1101 AC_DEFINE(_GLIBCXX98_USE_C99_WCHAR, 1,
1102 [Define if C99 functions or macros in <wchar.h> should be imported
1103 in <cwchar> in namespace std for C++98.])
1104 fi
1105 fi
1107 # Option parsed, now set things appropriately.
1108 if test x"$glibcxx_cv_c99_math_cxx98" = x"no" ||
1109 test x"$glibcxx_cv_c99_complex_cxx98" = x"no" ||
1110 test x"$glibcxx_cv_c99_stdio_cxx98" = x"no" ||
1111 test x"$glibcxx_cv_c99_stdlib_cxx98" = x"no" ||
1112 test x"$glibcxx_cv_c99_wchar_cxx98" = x"no"; then
1113 enable_c99=no;
1114 else
1115 AC_DEFINE(_GLIBCXX_USE_C99, 1,
1116 [Define if C99 functions or macros from <wchar.h>, <math.h>,
1117 <complex.h>, <stdio.h>, and <stdlib.h> can be used or exposed.])
1118 fi
1120 gcc_no_link="$ac_save_gcc_no_link"
1121 LIBS="$ac_save_LIBS"
1122 CXXFLAGS="$ac_save_CXXFLAGS"
1123 AC_LANG_RESTORE
1125 AC_LANG_SAVE
1126 AC_LANG_CPLUSPLUS
1128 # Use -std=c++11 and test again for C99 library feature in C++11 mode.
1129 # For the reasons given above we use -std=c++11 not -std=gnu++11.
1130 ac_save_CXXFLAGS="$CXXFLAGS"
1131 CXXFLAGS="$CXXFLAGS -std=c++11"
1132 ac_save_LIBS="$LIBS"
1133 ac_save_gcc_no_link="$gcc_no_link"
1135 if test x$gcc_no_link != xyes; then
1136 # Use -fno-exceptions to that the C driver can link these tests without
1137 # hitting undefined references to personality routines.
1138 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1139 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
1140 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
1141 gcc_no_link=yes
1142 ])
1143 fi
1145 # Check for the existence of <math.h> functions used if C99 is enabled.
1146 AC_MSG_CHECKING([for ISO C99 support in <math.h> for C++11])
1147 AC_CACHE_VAL(glibcxx_cv_c99_math_cxx11, [
1148 GCC_TRY_COMPILE_OR_LINK(
1149 [#include <math.h>
1150 volatile double d1, d2;
1151 volatile int i;],
1152 [i = fpclassify(d1);
1153 i = isfinite(d1);
1154 i = isinf(d1);
1155 i = isnan(d1);
1156 i = isnormal(d1);
1157 i = signbit(d1);
1158 i = isgreater(d1, d2);
1159 i = isgreaterequal(d1, d2);
1160 i = isless(d1, d2);
1161 i = islessequal(d1, d2);
1162 i = islessgreater(d1, d2);
1163 i = islessgreater(d1, d2);
1164 i = isunordered(d1, d2);
1165 ], [glibcxx_cv_c99_math_cxx11=yes], [glibcxx_cv_c99_math_cxx11=no])
1166 ])
1167 AC_MSG_RESULT($glibcxx_cv_c99_math_cxx11)
1168 if test x"$glibcxx_cv_c99_math_cxx11" = x"yes"; then
1169 AC_DEFINE(_GLIBCXX11_USE_C99_MATH, 1,
1170 [Define if C99 functions or macros in <math.h> should be imported
1171 in <cmath> in namespace std for C++11.])
1172 fi
1174 # Check for the existence of <complex.h> complex math functions.
1175 # This is necessary even though libstdc++ uses the builtin versions
1176 # of these functions, because if the builtin cannot be used, a reference
1177 # to the library function is emitted.
1178 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
1179 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1180 if test x"$ac_has_complex_h" = x"yes"; then
1181 AC_MSG_CHECKING([for ISO C99 support in <complex.h> for C++11])
1182 AC_CACHE_VAL(glibcxx_cv_c99_complex_cxx11, [
1183 GCC_TRY_COMPILE_OR_LINK(
1184 [#include <complex.h>
1185 typedef __complex__ float float_type;
1186 typedef __complex__ double double_type;
1187 typedef __complex__ long double ld_type;
1188 volatile float_type tmpf;
1189 volatile double_type tmpd;
1190 volatile ld_type tmpld;
1191 volatile float f;
1192 volatile double d;
1193 volatile long double ld;],
1194 [f = cabsf(tmpf);
1195 f = cargf(tmpf);
1196 tmpf = ccosf(tmpf);
1197 tmpf = ccoshf(tmpf);
1198 tmpf = cexpf(tmpf);
1199 tmpf = clogf(tmpf);
1200 tmpf = csinf(tmpf);
1201 tmpf = csinhf(tmpf);
1202 tmpf = csqrtf(tmpf);
1203 tmpf = ctanf(tmpf);
1204 tmpf = ctanhf(tmpf);
1205 tmpf = cpowf(tmpf, tmpf);
1206 tmpf = cprojf(tmpf);
1207 d = cabs(tmpd);
1208 d = carg(tmpd);
1209 tmpd = ccos(tmpd);
1210 tmpd = ccosh(tmpd);
1211 tmpd = cexp(tmpd);
1212 tmpd = clog(tmpd);
1213 tmpd = csin(tmpd);
1214 tmpd = csinh(tmpd);
1215 tmpd = csqrt(tmpd);
1216 tmpd = ctan(tmpd);
1217 tmpd = ctanh(tmpd);
1218 tmpd = cpow(tmpd, tmpd);
1219 tmpd = cproj(tmpd);
1220 ld = cabsl(tmpld);
1221 ld = cargl(tmpld);
1222 tmpld = ccosl(tmpld);
1223 tmpld = ccoshl(tmpld);
1224 tmpld = cexpl(tmpld);
1225 tmpld = clogl(tmpld);
1226 tmpld = csinl(tmpld);
1227 tmpld = csinhl(tmpld);
1228 tmpld = csqrtl(tmpld);
1229 tmpld = ctanl(tmpld);
1230 tmpld = ctanhl(tmpld);
1231 tmpld = cpowl(tmpld, tmpld);
1232 tmpld = cprojl(tmpld);
1233 ], [glibcxx_cv_c99_complex_cxx11=yes], [glibcxx_cv_c99_complex_cxx11=no])
1234 ])
1235 fi
1236 AC_MSG_RESULT($glibcxx_cv_c99_complex_cxx11)
1237 if test x"$glibcxx_cv_c99_complex_cxx11" = x"yes"; then
1238 AC_DEFINE(_GLIBCXX11_USE_C99_COMPLEX, 1,
1239 [Define if C99 functions in <complex.h> should be used in
1240 <complex> for C++11. Using compiler builtins for these functions
1241 requires corresponding C99 library functions to be present.])
1242 fi
1244 # Check for the existence in <stdio.h> of vscanf, et. al.
1245 AC_MSG_CHECKING([for ISO C99 support in <stdio.h> for C++11])
1246 AC_CACHE_VAL(glibcxx_cv_c99_stdio_cxx11, [
1247 GCC_TRY_COMPILE_OR_LINK(
1248 [#include <stdio.h>
1249 #include <stdarg.h>
1250 void foo(char* fmt, ...)
1251 {
1252 va_list args; va_start(args, fmt);
1253 vfscanf(stderr, "%i", args);
1254 vscanf("%i", args);
1255 vsnprintf(fmt, 0, "%i", args);
1256 vsscanf(fmt, "%i", args);
1257 snprintf(fmt, 0, "%i");
1258 }], [],
1259 [glibcxx_cv_c99_stdio_cxx11=yes], [glibcxx_cv_c99_stdio_cxx11=no])
1260 ])
1261 AC_MSG_RESULT($glibcxx_cv_c99_stdio_cxx11)
1262 if test x"$glibcxx_cv_c99_stdio_cxx11" = x"yes"; then
1263 AC_DEFINE(_GLIBCXX11_USE_C99_STDIO, 1,
1264 [Define if C99 functions or macros in <stdio.h> should be imported
1265 in <cstdio> in namespace std for C++11.])
1266 fi
1268 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
1269 AC_MSG_CHECKING([for ISO C99 support in <stdlib.h> for C++11])
1270 AC_CACHE_VAL(glibcxx_cv_c99_stdlib_cxx11, [
1271 GCC_TRY_COMPILE_OR_LINK(
1272 [#include <stdlib.h>
1273 volatile float f;
1274 volatile long double ld;
1275 volatile unsigned long long ll;
1276 lldiv_t mydivt;],
1277 [char* tmp;
1278 f = strtof("gnu", &tmp);
1279 ld = strtold("gnu", &tmp);
1280 ll = strtoll("gnu", &tmp, 10);
1281 ll = strtoull("gnu", &tmp, 10);
1282 ll = llabs(10);
1283 mydivt = lldiv(10,1);
1284 ll = mydivt.quot;
1285 ll = mydivt.rem;
1286 ll = atoll("10");
1287 _Exit(0);
1288 ], [glibcxx_cv_c99_stdlib_cxx11=yes], [glibcxx_cv_c99_stdlib_cxx11=no])
1289 ])
1290 AC_MSG_RESULT($glibcxx_cv_c99_stdlib_cxx11)
1291 if test x"$glibcxx_cv_c99_stdlib_cxx11" = x"yes"; then
1292 AC_DEFINE(_GLIBCXX11_USE_C99_STDLIB, 1,
1293 [Define if C99 functions or macros in <stdlib.h> should be imported
1294 in <cstdlib> in namespace std for C++11.])
1295 fi
1297 # Check for the existence in <wchar.h> of wcstold, etc.
1298 if test x"$ac_has_wchar_h" = xyes &&
1299 test x"$ac_has_wctype_h" = xyes; then
1300 AC_MSG_CHECKING([for ISO C99 support in <wchar.h> for C++11])
1301 AC_CACHE_VAL(glibcxx_cv_c99_wchar_cxx11, [
1302 AC_TRY_COMPILE([#include <wchar.h>
1303 namespace test
1304 {
1305 using ::wcstold;
1306 using ::wcstoll;
1307 using ::wcstoull;
1308 }
1309 ], [], [glibcxx_cv_c99_wchar_cxx11=yes], [glibcxx_cv_c99_wchar_cxx11=no])
1310 ])
1312 # Checks for wide character functions that may not be present.
1313 # Injection of these is wrapped with guard macros.
1314 # NB: only put functions here, instead of immediately above, if
1315 # absolutely necessary.
1316 AC_TRY_COMPILE([#include <wchar.h>
1317 namespace test { using ::vfwscanf; }], [],
1318 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1320 AC_TRY_COMPILE([#include <wchar.h>
1321 namespace test { using ::vswscanf; }], [],
1322 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1324 AC_TRY_COMPILE([#include <wchar.h>
1325 namespace test { using ::vwscanf; }], [],
1326 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1328 AC_TRY_COMPILE([#include <wchar.h>
1329 namespace test { using ::wcstof; }], [],
1330 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1332 AC_TRY_COMPILE([#include <wctype.h>],
1333 [wint_t t; int i = iswblank(t);],
1334 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1336 AC_MSG_RESULT($glibcxx_cv_c99_wchar_cxx11)
1337 if test x"$glibcxx_cv_c99_wchar_cxx11" = x"yes"; then
1338 AC_DEFINE(_GLIBCXX11_USE_C99_WCHAR, 1,
1339 [Define if C99 functions or macros in <wchar.h> should be imported
1340 in <cwchar> in namespace std for C++11.])
1341 fi
1342 fi
1344 gcc_no_link="$ac_save_gcc_no_link"
1345 LIBS="$ac_save_LIBS"
1346 CXXFLAGS="$ac_save_CXXFLAGS"
1347 AC_LANG_RESTORE
1348 fi
1350 AC_MSG_CHECKING([for fully enabled ISO C99 support])
1351 AC_MSG_RESULT($enable_c99)
1352 ])
1355 dnl
1356 dnl Check for clock_gettime, nanosleep and sched_yield, used in the
1357 dnl implementation of 20.11.7 [time.clock], and 30.3.2 [thread.thread.this]
1358 dnl in the C++11 standard.
1359 dnl
1360 dnl --enable-libstdcxx-time
1361 dnl --enable-libstdcxx-time=yes
1362 dnl checks for the availability of monotonic and realtime clocks,
1363 dnl nanosleep and sched_yield in libc and libposix4 and, if needed,
1364 dnl links in the latter.
1365 dnl --enable-libstdcxx-time=rt
1366 dnl also searches (and, if needed, links) librt. Note that this is
1367 dnl not always desirable because, in glibc 2.16 and earlier, for
1368 dnl example, in turn it triggers the linking of libpthread too,
1369 dnl which activates locking,
1370 dnl a large overhead for single-thread programs.
1371 dnl --enable-libstdcxx-time=no
1372 dnl --disable-libstdcxx-time
1373 dnl disables the checks completely
1374 dnl
1375 dnl N.B. Darwin provides nanosleep but doesn't support the whole POSIX
1376 dnl Timers option, so doesn't define _POSIX_TIMERS. Because the test
1377 dnl below fails Darwin unconditionally defines _GLIBCXX_USE_NANOSLEEP in
1378 dnl os_defines.h and also defines _GLIBCXX_USE_SCHED_YIELD.
1379 dnl
1380 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
1382 GLIBCXX_ENABLE(libstdcxx-time,auto,[[[=KIND]]],
1383 [use KIND for check type],
1384 [permit yes|no|rt])
1386 AC_LANG_SAVE
1387 AC_LANG_CPLUSPLUS
1388 ac_save_CXXFLAGS="$CXXFLAGS"
1389 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1390 ac_save_LIBS="$LIBS"
1392 ac_has_clock_monotonic=no
1393 ac_has_clock_realtime=no
1394 ac_has_nanosleep=no
1395 ac_has_sched_yield=no
1397 if test x"$enable_libstdcxx_time" = x"auto"; then
1399 case "${target_os}" in
1400 cygwin*)
1401 ac_has_nanosleep=yes
1402 ;;
1403 darwin*)
1404 ac_has_nanosleep=yes
1405 ac_has_sched_yield=yes
1406 ;;
1407 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
1408 AC_MSG_CHECKING([for at least GNU libc 2.17])
1409 AC_TRY_COMPILE(
1410 [#include <features.h>],
1411 [
1412 #if ! __GLIBC_PREREQ(2, 17)
1413 #error
1414 #endif
1415 ],
1416 [glibcxx_glibc217=yes], [glibcxx_glibc217=no])
1417 AC_MSG_RESULT($glibcxx_glibc217)
1419 if test x"$glibcxx_glibc217" = x"yes"; then
1420 ac_has_clock_monotonic=yes
1421 ac_has_clock_realtime=yes
1422 fi
1423 ac_has_nanosleep=yes
1424 ac_has_sched_yield=yes
1425 ;;
1426 freebsd*|netbsd*|dragonfly*|rtems*)
1427 ac_has_clock_monotonic=yes
1428 ac_has_clock_realtime=yes
1429 ac_has_nanosleep=yes
1430 ac_has_sched_yield=yes
1431 ;;
1432 openbsd*)
1433 ac_has_clock_monotonic=yes
1434 ac_has_clock_realtime=yes
1435 ac_has_nanosleep=yes
1436 ;;
1437 solaris*)
1438 GLIBCXX_LIBS="$GLIBCXX_LIBS -lrt"
1439 ac_has_clock_monotonic=yes
1440 ac_has_clock_realtime=yes
1441 ac_has_nanosleep=yes
1442 ac_has_sched_yield=yes
1443 ;;
1444 uclinux*)
1445 ac_has_nanosleep=yes
1446 ac_has_sched_yield=yes
1447 esac
1449 elif test x"$enable_libstdcxx_time" != x"no"; then
1451 if test x"$enable_libstdcxx_time" = x"rt"; then
1452 AC_SEARCH_LIBS(clock_gettime, [rt posix4])
1453 AC_SEARCH_LIBS(nanosleep, [rt posix4])
1454 else
1455 AC_SEARCH_LIBS(clock_gettime, [posix4])
1456 AC_SEARCH_LIBS(nanosleep, [posix4])
1457 fi
1459 case "$ac_cv_search_clock_gettime" in
1460 -l*) GLIBCXX_LIBS=$ac_cv_search_clock_gettime
1461 ;;
1462 esac
1463 case "$ac_cv_search_nanosleep" in
1464 -l*) GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_nanosleep"
1465 ;;
1466 esac
1468 AC_SEARCH_LIBS(sched_yield, [rt posix4])
1470 case "$ac_cv_search_sched_yield" in
1471 -lposix4*)
1472 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1473 ac_has_sched_yield=yes
1474 ;;
1475 -lrt*)
1476 if test x"$enable_libstdcxx_time" = x"rt"; then
1477 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1478 ac_has_sched_yield=yes
1479 fi
1480 ;;
1481 *)
1482 ac_has_sched_yield=yes
1483 ;;
1484 esac
1486 AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
1488 if test x"$ac_has_unistd_h" = x"yes"; then
1489 AC_MSG_CHECKING([for monotonic clock])
1490 AC_TRY_LINK(
1491 [#include <unistd.h>
1492 #include <time.h>
1493 ],
1494 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1495 timespec tp;
1496 #endif
1497 clock_gettime(CLOCK_MONOTONIC, &tp);
1498 ], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
1500 AC_MSG_RESULT($ac_has_clock_monotonic)
1502 AC_MSG_CHECKING([for realtime clock])
1503 AC_TRY_LINK(
1504 [#include <unistd.h>
1505 #include <time.h>
1506 ],
1507 [#if _POSIX_TIMERS > 0
1508 timespec tp;
1509 #endif
1510 clock_gettime(CLOCK_REALTIME, &tp);
1511 ], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
1513 AC_MSG_RESULT($ac_has_clock_realtime)
1515 AC_MSG_CHECKING([for nanosleep])
1516 AC_TRY_LINK(
1517 [#include <unistd.h>
1518 #include <time.h>
1519 ],
1520 [#if _POSIX_TIMERS > 0
1521 timespec tp;
1522 #endif
1523 nanosleep(&tp, 0);
1524 ], [ac_has_nanosleep=yes], [ac_has_nanosleep=no])
1526 AC_MSG_RESULT($ac_has_nanosleep)
1527 fi
1528 fi
1530 if test x"$ac_has_clock_monotonic" != x"yes"; then
1531 case ${target_os} in
1532 linux* | uclinux*)
1533 AC_MSG_CHECKING([for clock_gettime syscall])
1534 AC_TRY_COMPILE(
1535 [#include <unistd.h>
1536 #include <time.h>
1537 #include <sys/syscall.h>
1538 ],
1539 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1540 timespec tp;
1541 #endif
1542 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp);
1543 syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);
1544 ], [ac_has_clock_monotonic_syscall=yes], [ac_has_clock_monotonic_syscall=no])
1545 AC_MSG_RESULT($ac_has_clock_monotonic_syscall)
1546 if test x"$ac_has_clock_monotonic_syscall" = x"yes"; then
1547 AC_DEFINE(_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL, 1,
1548 [ Defined if clock_gettime syscall has monotonic and realtime clock support. ])
1549 ac_has_clock_monotonic=yes
1550 ac_has_clock_realtime=yes
1551 fi;;
1552 esac
1553 fi
1555 if test x"$ac_has_clock_monotonic" = x"yes"; then
1556 AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
1557 [ Defined if clock_gettime has monotonic clock support. ])
1558 fi
1560 if test x"$ac_has_clock_realtime" = x"yes"; then
1561 AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
1562 [ Defined if clock_gettime has realtime clock support. ])
1563 fi
1565 if test x"$ac_has_sched_yield" = x"yes"; then
1566 AC_DEFINE(_GLIBCXX_USE_SCHED_YIELD, 1,
1567 [ Defined if sched_yield is available. ])
1568 fi
1570 if test x"$ac_has_nanosleep" = x"yes"; then
1571 AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
1572 [ Defined if nanosleep is available. ])
1573 else
1574 AC_MSG_CHECKING([for sleep])
1575 AC_TRY_COMPILE([#include <unistd.h>],
1576 [sleep(1)],
1577 [ac_has_sleep=yes],[ac_has_sleep=no])
1578 if test x"$ac_has_sleep" = x"yes"; then
1579 AC_DEFINE(HAVE_SLEEP,1, [Defined if sleep exists.])
1580 fi
1581 AC_MSG_RESULT($ac_has_sleep)
1582 AC_MSG_CHECKING([for usleep])
1583 AC_TRY_COMPILE([#include <unistd.h>],
1584 [sleep(1);
1585 usleep(100);],
1586 [ac_has_usleep=yes],[ac_has_usleep=no])
1587 if test x"$ac_has_usleep" = x"yes"; then
1588 AC_DEFINE(HAVE_USLEEP,1, [Defined if usleep exists.])
1589 fi
1590 AC_MSG_RESULT($ac_has_usleep)
1591 fi
1593 if test x"$ac_has_nanosleep$ac_has_sleep" = x"nono"; then
1594 AC_MSG_CHECKING([for Sleep])
1595 AC_TRY_COMPILE([#include <windows.h>],
1596 [Sleep(1)],
1597 [ac_has_win32_sleep=yes],[ac_has_win32_sleep=no])
1598 if test x"$ac_has_win32_sleep" = x"yes"; then
1599 AC_DEFINE(HAVE_WIN32_SLEEP,1, [Defined if Sleep exists.])
1600 fi
1601 AC_MSG_RESULT($ac_has_win32_sleep)
1602 fi
1604 AC_SUBST(GLIBCXX_LIBS)
1606 CXXFLAGS="$ac_save_CXXFLAGS"
1607 LIBS="$ac_save_LIBS"
1608 AC_LANG_RESTORE
1609 ])
1611 dnl
1612 dnl Check for gettimeofday, used in the implementation of 20.11.7
1613 dnl [time.clock] in the C++11 standard.
1614 dnl
1615 AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
1617 AC_MSG_CHECKING([for gettimeofday])
1619 AC_LANG_SAVE
1620 AC_LANG_CPLUSPLUS
1621 ac_save_CXXFLAGS="$CXXFLAGS"
1622 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1624 ac_has_gettimeofday=no;
1625 AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
1626 if test x"$ac_has_sys_time_h" = x"yes"; then
1627 AC_MSG_CHECKING([for gettimeofday])
1628 GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
1629 [timeval tv; gettimeofday(&tv, 0);],
1630 [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
1632 AC_MSG_RESULT($ac_has_gettimeofday)
1633 fi
1635 if test x"$ac_has_gettimeofday" = x"yes"; then
1636 AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
1637 [ Defined if gettimeofday is available. ])
1638 fi
1640 CXXFLAGS="$ac_save_CXXFLAGS"
1641 AC_LANG_RESTORE
1642 ])
1644 dnl
1645 dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
1646 dnl facilities in Chapter 8, "C compatibility".
1647 dnl
1648 AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
1650 AC_LANG_SAVE
1651 AC_LANG_CPLUSPLUS
1653 # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
1654 # undefined and fake C99 facilities may be spuriously enabled.
1655 ac_save_CXXFLAGS="$CXXFLAGS"
1656 CXXFLAGS="$CXXFLAGS -std=c++98"
1658 # Check for the existence of <complex.h> complex math functions used
1659 # by tr1/complex.
1660 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1661 ac_c99_complex_tr1=no;
1662 if test x"$ac_has_complex_h" = x"yes"; then
1663 AC_MSG_CHECKING([for ISO C99 support to TR1 in <complex.h>])
1664 AC_TRY_COMPILE([#include <complex.h>],
1665 [typedef __complex__ float float_type; float_type tmpf;
1666 cacosf(tmpf);
1667 casinf(tmpf);
1668 catanf(tmpf);
1669 cacoshf(tmpf);
1670 casinhf(tmpf);
1671 catanhf(tmpf);
1672 typedef __complex__ double double_type; double_type tmpd;
1673 cacos(tmpd);
1674 casin(tmpd);
1675 catan(tmpd);
1676 cacosh(tmpd);
1677 casinh(tmpd);
1678 catanh(tmpd);
1679 typedef __complex__ long double ld_type; ld_type tmpld;
1680 cacosl(tmpld);
1681 casinl(tmpld);
1682 catanl(tmpld);
1683 cacoshl(tmpld);
1684 casinhl(tmpld);
1685 catanhl(tmpld);
1686 ],[ac_c99_complex_tr1=yes], [ac_c99_complex_tr1=no])
1687 fi
1688 AC_MSG_RESULT($ac_c99_complex_tr1)
1689 if test x"$ac_c99_complex_tr1" = x"yes"; then
1690 AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_TR1, 1,
1691 [Define if C99 functions in <complex.h> should be used in
1692 <tr1/complex>. Using compiler builtins for these functions
1693 requires corresponding C99 library functions to be present.])
1694 fi
1696 # Check for the existence of <ctype.h> functions.
1697 AC_MSG_CHECKING([for ISO C99 support to TR1 in <ctype.h>])
1698 AC_CACHE_VAL(glibcxx_cv_c99_ctype_tr1, [
1699 AC_TRY_COMPILE([#include <ctype.h>],
1700 [int ch;
1701 int ret;
1702 ret = isblank(ch);
1703 ],[glibcxx_cv_c99_ctype_tr1=yes],
1704 [glibcxx_cv_c99_ctype_tr1=no])
1705 ])
1706 AC_MSG_RESULT($glibcxx_cv_c99_ctype_tr1)
1707 if test x"$glibcxx_cv_c99_ctype_tr1" = x"yes"; then
1708 AC_DEFINE(_GLIBCXX_USE_C99_CTYPE_TR1, 1,
1709 [Define if C99 functions in <ctype.h> should be imported in
1710 <tr1/cctype> in namespace std::tr1.])
1711 fi
1713 # Check for the existence of <fenv.h> functions.
1714 AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no)
1715 ac_c99_fenv_tr1=no;
1716 if test x"$ac_has_fenv_h" = x"yes"; then
1717 AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>])
1718 AC_TRY_COMPILE([#include <fenv.h>],
1719 [int except, mode;
1720 fexcept_t* pflag;
1721 fenv_t* penv;
1722 int ret;
1723 ret = feclearexcept(except);
1724 ret = fegetexceptflag(pflag, except);
1725 ret = feraiseexcept(except);
1726 ret = fesetexceptflag(pflag, except);
1727 ret = fetestexcept(except);
1728 ret = fegetround();
1729 ret = fesetround(mode);
1730 ret = fegetenv(penv);
1731 ret = feholdexcept(penv);
1732 ret = fesetenv(penv);
1733 ret = feupdateenv(penv);
1734 ],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no])
1735 fi
1736 AC_MSG_RESULT($ac_c99_fenv_tr1)
1737 if test x"$ac_c99_fenv_tr1" = x"yes"; then
1738 AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1,
1739 [Define if C99 functions in <fenv.h> should be imported in
1740 <tr1/cfenv> in namespace std::tr1.])
1741 fi
1743 # Check for the existence of <stdint.h> types.
1744 AC_MSG_CHECKING([for ISO C99 support to TR1 in <stdint.h>])
1745 AC_CACHE_VAL(glibcxx_cv_c99_stdint_tr1, [
1746 AC_TRY_COMPILE([#define __STDC_LIMIT_MACROS
1747 #define __STDC_CONSTANT_MACROS
1748 #include <stdint.h>],
1749 [typedef int8_t my_int8_t;
1750 my_int8_t i8 = INT8_MIN;
1751 i8 = INT8_MAX;
1752 typedef int16_t my_int16_t;
1753 my_int16_t i16 = INT16_MIN;
1754 i16 = INT16_MAX;
1755 typedef int32_t my_int32_t;
1756 my_int32_t i32 = INT32_MIN;
1757 i32 = INT32_MAX;
1758 typedef int64_t my_int64_t;
1759 my_int64_t i64 = INT64_MIN;
1760 i64 = INT64_MAX;
1761 typedef int_fast8_t my_int_fast8_t;
1762 my_int_fast8_t if8 = INT_FAST8_MIN;
1763 if8 = INT_FAST8_MAX;
1764 typedef int_fast16_t my_int_fast16_t;
1765 my_int_fast16_t if16 = INT_FAST16_MIN;
1766 if16 = INT_FAST16_MAX;
1767 typedef int_fast32_t my_int_fast32_t;
1768 my_int_fast32_t if32 = INT_FAST32_MIN;
1769 if32 = INT_FAST32_MAX;
1770 typedef int_fast64_t my_int_fast64_t;
1771 my_int_fast64_t if64 = INT_FAST64_MIN;
1772 if64 = INT_FAST64_MAX;
1773 typedef int_least8_t my_int_least8_t;
1774 my_int_least8_t il8 = INT_LEAST8_MIN;
1775 il8 = INT_LEAST8_MAX;
1776 typedef int_least16_t my_int_least16_t;
1777 my_int_least16_t il16 = INT_LEAST16_MIN;
1778 il16 = INT_LEAST16_MAX;
1779 typedef int_least32_t my_int_least32_t;
1780 my_int_least32_t il32 = INT_LEAST32_MIN;
1781 il32 = INT_LEAST32_MAX;
1782 typedef int_least64_t my_int_least64_t;
1783 my_int_least64_t il64 = INT_LEAST64_MIN;
1784 il64 = INT_LEAST64_MAX;
1785 typedef intmax_t my_intmax_t;
1786 my_intmax_t im = INTMAX_MAX;
1787 im = INTMAX_MIN;
1788 typedef intptr_t my_intptr_t;
1789 my_intptr_t ip = INTPTR_MAX;
1790 ip = INTPTR_MIN;
1791 typedef uint8_t my_uint8_t;
1792 my_uint8_t ui8 = UINT8_MAX;
1793 ui8 = UINT8_MAX;
1794 typedef uint16_t my_uint16_t;
1795 my_uint16_t ui16 = UINT16_MAX;
1796 ui16 = UINT16_MAX;
1797 typedef uint32_t my_uint32_t;
1798 my_uint32_t ui32 = UINT32_MAX;
1799 ui32 = UINT32_MAX;
1800 typedef uint64_t my_uint64_t;
1801 my_uint64_t ui64 = UINT64_MAX;
1802 ui64 = UINT64_MAX;
1803 typedef uint_fast8_t my_uint_fast8_t;
1804 my_uint_fast8_t uif8 = UINT_FAST8_MAX;
1805 uif8 = UINT_FAST8_MAX;
1806 typedef uint_fast16_t my_uint_fast16_t;
1807 my_uint_fast16_t uif16 = UINT_FAST16_MAX;
1808 uif16 = UINT_FAST16_MAX;
1809 typedef uint_fast32_t my_uint_fast32_t;
1810 my_uint_fast32_t uif32 = UINT_FAST32_MAX;
1811 uif32 = UINT_FAST32_MAX;
1812 typedef uint_fast64_t my_uint_fast64_t;
1813 my_uint_fast64_t uif64 = UINT_FAST64_MAX;
1814 uif64 = UINT_FAST64_MAX;
1815 typedef uint_least8_t my_uint_least8_t;
1816 my_uint_least8_t uil8 = UINT_LEAST8_MAX;
1817 uil8 = UINT_LEAST8_MAX;
1818 typedef uint_least16_t my_uint_least16_t;
1819 my_uint_least16_t uil16 = UINT_LEAST16_MAX;
1820 uil16 = UINT_LEAST16_MAX;
1821 typedef uint_least32_t my_uint_least32_t;
1822 my_uint_least32_t uil32 = UINT_LEAST32_MAX;
1823 uil32 = UINT_LEAST32_MAX;
1824 typedef uint_least64_t my_uint_least64_t;
1825 my_uint_least64_t uil64 = UINT_LEAST64_MAX;
1826 uil64 = UINT_LEAST64_MAX;
1827 typedef uintmax_t my_uintmax_t;
1828 my_uintmax_t uim = UINTMAX_MAX;
1829 uim = UINTMAX_MAX;
1830 typedef uintptr_t my_uintptr_t;
1831 my_uintptr_t uip = UINTPTR_MAX;
1832 uip = UINTPTR_MAX;
1833 ],[glibcxx_cv_c99_stdint_tr1=yes],
1834 [glibcxx_cv_c99_stdint_tr1=no])
1835 ])
1836 AC_MSG_RESULT($glibcxx_cv_c99_stdint_tr1)
1837 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1838 AC_DEFINE(_GLIBCXX_USE_C99_STDINT_TR1, 1,
1839 [Define if C99 types in <stdint.h> should be imported in
1840 <tr1/cstdint> in namespace std::tr1.])
1841 fi
1843 # Check for the existence of <math.h> functions.
1844 AC_MSG_CHECKING([for ISO C99 support to TR1 in <math.h>])
1845 AC_CACHE_VAL(glibcxx_cv_c99_math_tr1, [
1846 AC_TRY_COMPILE([#include <math.h>],
1847 [typedef double_t my_double_t;
1848 typedef float_t my_float_t;
1849 acosh(0.0);
1850 acoshf(0.0f);
1851 acoshl(0.0l);
1852 asinh(0.0);
1853 asinhf(0.0f);
1854 asinhl(0.0l);
1855 atanh(0.0);
1856 atanhf(0.0f);
1857 atanhl(0.0l);
1858 cbrt(0.0);
1859 cbrtf(0.0f);
1860 cbrtl(0.0l);
1861 copysign(0.0, 0.0);
1862 copysignf(0.0f, 0.0f);
1863 copysignl(0.0l, 0.0l);
1864 erf(0.0);
1865 erff(0.0f);
1866 erfl(0.0l);
1867 erfc(0.0);
1868 erfcf(0.0f);
1869 erfcl(0.0l);
1870 exp2(0.0);
1871 exp2f(0.0f);
1872 exp2l(0.0l);
1873 expm1(0.0);
1874 expm1f(0.0f);
1875 expm1l(0.0l);
1876 fdim(0.0, 0.0);
1877 fdimf(0.0f, 0.0f);
1878 fdiml(0.0l, 0.0l);
1879 fma(0.0, 0.0, 0.0);
1880 fmaf(0.0f, 0.0f, 0.0f);
1881 fmal(0.0l, 0.0l, 0.0l);
1882 fmax(0.0, 0.0);
1883 fmaxf(0.0f, 0.0f);
1884 fmaxl(0.0l, 0.0l);
1885 fmin(0.0, 0.0);
1886 fminf(0.0f, 0.0f);
1887 fminl(0.0l, 0.0l);
1888 hypot(0.0, 0.0);
1889 hypotf(0.0f, 0.0f);
1890 hypotl(0.0l, 0.0l);
1891 ilogb(0.0);
1892 ilogbf(0.0f);
1893 ilogbl(0.0l);
1894 lgamma(0.0);
1895 lgammaf(0.0f);
1896 lgammal(0.0l);
1897 #ifndef __APPLE__ /* see below */
1898 llrint(0.0);
1899 llrintf(0.0f);
1900 llrintl(0.0l);
1901 llround(0.0);
1902 llroundf(0.0f);
1903 llroundl(0.0l);
1904 #endif
1905 log1p(0.0);
1906 log1pf(0.0f);
1907 log1pl(0.0l);
1908 log2(0.0);
1909 log2f(0.0f);
1910 log2l(0.0l);
1911 logb(0.0);
1912 logbf(0.0f);
1913 logbl(0.0l);
1914 lrint(0.0);
1915 lrintf(0.0f);
1916 lrintl(0.0l);
1917 lround(0.0);
1918 lroundf(0.0f);
1919 lroundl(0.0l);
1920 nan(0);
1921 nanf(0);
1922 nanl(0);
1923 nearbyint(0.0);
1924 nearbyintf(0.0f);
1925 nearbyintl(0.0l);
1926 nextafter(0.0, 0.0);
1927 nextafterf(0.0f, 0.0f);
1928 nextafterl(0.0l, 0.0l);
1929 nexttoward(0.0, 0.0);
1930 nexttowardf(0.0f, 0.0f);
1931 nexttowardl(0.0l, 0.0l);
1932 remainder(0.0, 0.0);
1933 remainderf(0.0f, 0.0f);
1934 remainderl(0.0l, 0.0l);
1935 remquo(0.0, 0.0, 0);
1936 remquof(0.0f, 0.0f, 0);
1937 remquol(0.0l, 0.0l, 0);
1938 rint(0.0);
1939 rintf(0.0f);
1940 rintl(0.0l);
1941 round(0.0);
1942 roundf(0.0f);
1943 roundl(0.0l);
1944 scalbln(0.0, 0l);
1945 scalblnf(0.0f, 0l);
1946 scalblnl(0.0l, 0l);
1947 scalbn(0.0, 0);
1948 scalbnf(0.0f, 0);
1949 scalbnl(0.0l, 0);
1950 tgamma(0.0);
1951 tgammaf(0.0f);
1952 tgammal(0.0l);
1953 trunc(0.0);
1954 truncf(0.0f);
1955 truncl(0.0l);
1956 ],[glibcxx_cv_c99_math_tr1=yes], [glibcxx_cv_c99_math_tr1=no])
1957 ])
1958 AC_MSG_RESULT($glibcxx_cv_c99_math_tr1)
1959 if test x"$glibcxx_cv_c99_math_tr1" = x"yes"; then
1960 AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
1961 [Define if C99 functions or macros in <math.h> should be imported
1962 in <tr1/cmath> in namespace std::tr1.])
1964 case "${target_os}" in
1965 darwin*)
1966 AC_MSG_CHECKING([for ISO C99 rounding functions in <math.h>])
1967 AC_CACHE_VAL(glibcxx_cv_c99_math_llround, [
1968 AC_TRY_COMPILE([#include <math.h>],
1969 [llrint(0.0);
1970 llrintf(0.0f);
1971 llrintl(0.0l);
1972 llround(0.0);
1973 llroundf(0.0f);
1974 llroundl(0.0l);
1975 ],
1976 [glibcxx_cv_c99_math_llround=yes],
1977 [glibcxx_cv_c99_math_llround=no])
1978 ])
1979 AC_MSG_RESULT($glibcxx_cv_c99_math_llround)
1980 ;;
1981 esac
1982 if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
1983 AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
1984 [Define if C99 llrint and llround functions are missing from <math.h>.])
1985 fi
1986 fi
1988 # Check for the existence of <inttypes.h> functions (NB: doesn't make
1989 # sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1990 ac_c99_inttypes_tr1=no;
1991 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1992 AC_MSG_CHECKING([for ISO C99 support to TR1 in <inttypes.h>])
1993 AC_TRY_COMPILE([#include <inttypes.h>],
1994 [intmax_t i, numer, denom, base;
1995 const char* s;
1996 char** endptr;
1997 intmax_t ret = imaxabs(i);
1998 imaxdiv_t dret = imaxdiv(numer, denom);
1999 ret = strtoimax(s, endptr, base);
2000 uintmax_t uret = strtoumax(s, endptr, base);
2001 ],[ac_c99_inttypes_tr1=yes], [ac_c99_inttypes_tr1=no])
2002 fi
2003 AC_MSG_RESULT($ac_c99_inttypes_tr1)
2004 if test x"$ac_c99_inttypes_tr1" = x"yes"; then
2005 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_TR1, 1,
2006 [Define if C99 functions in <inttypes.h> should be imported in
2007 <tr1/cinttypes> in namespace std::tr1.])
2008 fi
2010 # Check for the existence of wchar_t <inttypes.h> functions (NB: doesn't
2011 # make sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
2012 ac_c99_inttypes_wchar_t_tr1=no;
2013 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
2014 AC_MSG_CHECKING([for wchar_t ISO C99 support to TR1 in <inttypes.h>])
2015 AC_TRY_COMPILE([#include <inttypes.h>],
2016 [intmax_t base;
2017 const wchar_t* s;
2018 wchar_t** endptr;
2019 intmax_t ret = wcstoimax(s, endptr, base);
2020 uintmax_t uret = wcstoumax(s, endptr, base);
2021 ],[ac_c99_inttypes_wchar_t_tr1=yes],
2022 [ac_c99_inttypes_wchar_t_tr1=no])
2023 fi
2024 AC_MSG_RESULT($ac_c99_inttypes_wchar_t_tr1)
2025 if test x"$ac_c99_inttypes_wchar_t_tr1" = x"yes"; then
2026 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1, 1,
2027 [Define if wchar_t C99 functions in <inttypes.h> should be
2028 imported in <tr1/cinttypes> in namespace std::tr1.])
2029 fi
2031 # Check for the existence of the <stdbool.h> header.
2032 AC_CHECK_HEADERS(stdbool.h)
2034 # Check for the existence of the <stdalign.h> header.
2035 AC_CHECK_HEADERS(stdalign.h)
2037 CXXFLAGS="$ac_save_CXXFLAGS"
2038 AC_LANG_RESTORE
2039 ])
2041 dnl
2042 dnl Check for uchar.h and usability.
2043 dnl
2044 AC_DEFUN([GLIBCXX_CHECK_UCHAR_H], [
2046 # Test uchar.h.
2047 AC_CHECK_HEADERS(uchar.h, ac_has_uchar_h=yes, ac_has_uchar_h=no)
2049 AC_LANG_SAVE
2050 AC_LANG_CPLUSPLUS
2051 ac_save_CXXFLAGS="$CXXFLAGS"
2052 CXXFLAGS="$CXXFLAGS -std=c++11"
2054 if test x"$ac_has_uchar_h" = x"yes"; then
2055 AC_MSG_CHECKING([for ISO C11 support for <uchar.h>])
2056 AC_TRY_COMPILE([#include <uchar.h>
2057 #ifdef __STDC_UTF_16__
2058 long i = __STDC_UTF_16__;
2059 #endif
2060 #ifdef __STDC_UTF_32__
2061 long j = __STDC_UTF_32__;
2062 #endif
2063 namespace test
2064 {
2065 using ::c16rtomb;
2066 using ::c32rtomb;
2067 using ::mbrtoc16;
2068 using ::mbrtoc32;
2069 }
2070 ],
2071 [], [ac_c11_uchar_cxx11=yes], [ac_c11_uchar_cxx11=no])
2072 else
2073 ac_c11_uchar_cxx11=no
2074 fi
2075 AC_MSG_RESULT($ac_c11_uchar_cxx11)
2076 if test x"$ac_c11_uchar_cxx11" = x"yes"; then
2077 AC_DEFINE(_GLIBCXX_USE_C11_UCHAR_CXX11, 1,
2078 [Define if C11 functions in <uchar.h> should be imported into
2079 namespace std in <cuchar>.])
2080 fi
2082 CXXFLAGS="$ac_save_CXXFLAGS"
2083 AC_LANG_RESTORE
2084 ])
2087 dnl
2088 dnl Check whether "/dev/random" and "/dev/urandom" are available for
2089 dnl class std::random_device from C++ 2011 [rand.device], and
2090 dnl random_device of "TR1" (Chapter 5.1, "Random number generation").
2091 dnl
2092 AC_DEFUN([GLIBCXX_CHECK_DEV_RANDOM], [
2094 AC_MSG_CHECKING([for "/dev/random" and "/dev/urandom" for std::random_device])
2095 AC_CACHE_VAL(glibcxx_cv_dev_random, [
2096 if test -r /dev/random && test -r /dev/urandom; then
2097 ## For MSys environment the test above is detected as false-positive
2098 ## on mingw-targets. So disable it explicitly for them.
2099 case ${target_os} in
2100 *mingw*) glibcxx_cv_dev_random=no ;;
2101 *) glibcxx_cv_dev_random=yes ;;
2102 esac
2103 else
2104 glibcxx_cv_dev_random=no;
2105 fi
2106 ])
2107 AC_MSG_RESULT($glibcxx_cv_dev_random)
2109 if test x"$glibcxx_cv_dev_random" = x"yes"; then
2110 AC_DEFINE(_GLIBCXX_USE_DEV_RANDOM, 1,
2111 [Define if /dev/random and /dev/urandom are available for
2112 std::random_device.])
2113 AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1, 1,
2114 [Define if /dev/random and /dev/urandom are available for
2115 the random_device of TR1 (Chapter 5.1).])
2116 fi
2118 ])
2120 dnl
2121 dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
2122 dnl
2123 AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
2125 AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
2126 AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
2127 [#include <stdio.h>],
2128 [AC_MSG_ERROR([computing EOF failed])])
2129 ])
2130 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_EOF, $glibcxx_cv_stdio_eof,
2131 [Define to the value of the EOF integer constant.])
2133 AC_CACHE_CHECK([for the value of SEEK_CUR], glibcxx_cv_stdio_seek_cur, [
2134 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_cur], [[SEEK_CUR]],
2135 [#include <stdio.h>],
2136 [AC_MSG_ERROR([computing SEEK_CUR failed])])
2137 ])
2138 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_CUR, $glibcxx_cv_stdio_seek_cur,
2139 [Define to the value of the SEEK_CUR integer constant.])
2141 AC_CACHE_CHECK([for the value of SEEK_END], glibcxx_cv_stdio_seek_end, [
2142 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_end], [[SEEK_END]],
2143 [#include <stdio.h>],
2144 [AC_MSG_ERROR([computing SEEK_END failed])])
2145 ])
2146 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
2147 [Define to the value of the SEEK_END integer constant.])
2148 ])
2150 dnl
2151 dnl Check whether required C++ overloads are present in <stdio.h>.
2152 dnl
2153 AC_DEFUN([GLIBCXX_CHECK_STDIO_PROTO], [
2155 AC_LANG_SAVE
2156 AC_LANG_CPLUSPLUS
2157 # Use C++11 because a conforming <stdio.h> won't define gets for C++14,
2158 # and we don't need a declaration for C++14 anyway.
2159 ac_save_CXXFLAGS="$CXXFLAGS"
2160 CXXFLAGS="$CXXFLAGS -std=gnu++11"
2162 AC_MSG_CHECKING([for gets declaration])
2163 AC_CACHE_VAL(glibcxx_cv_gets, [
2164 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2165 [#include <stdio.h>
2166 namespace test
2167 {
2168 using ::gets;
2169 }
2170 ])],
2171 [glibcxx_cv_gets=yes],
2172 [glibcxx_cv_gets=no]
2173 )])
2175 if test $glibcxx_cv_gets = yes; then
2176 AC_DEFINE(HAVE_GETS, 1, [Define if gets is available in <stdio.h> before C++14.])
2177 fi
2178 AC_MSG_RESULT($glibcxx_cv_gets)
2180 CXXFLAGS="$ac_save_CXXFLAGS"
2181 AC_LANG_RESTORE
2182 ])
2184 dnl
2185 dnl Check whether required C++11 overloads for floating point and integral
2186 dnl types are present in <math.h>.
2187 dnl
2188 AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
2190 AC_LANG_SAVE
2191 AC_LANG_CPLUSPLUS
2192 ac_save_CXXFLAGS="$CXXFLAGS"
2193 CXXFLAGS="$CXXFLAGS -std=c++11"
2195 case "$host" in
2196 *-*-solaris2.*)
2197 # Solaris 12 Build 86, Solaris 11.3 SRU 3.6, and Solaris 10 Patch
2198 # 11996[67]-02 introduced the C++11 <math.h> floating point overloads.
2199 AC_MSG_CHECKING([for C++11 <math.h> floating point overloads])
2200 AC_CACHE_VAL(glibcxx_cv_math11_fp_overload, [
2201 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2202 [#include <math.h>
2203 #undef isfinite
2204 namespace std {
2205 inline bool isfinite(float __x)
2206 { return __builtin_isfinite(__x); }
2207 }
2208 ])],
2209 [glibcxx_cv_math11_fp_overload=no],
2210 [glibcxx_cv_math11_fp_overload=yes]
2211 )])
2213 # autoheader cannot handle indented templates.
2214 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_FP],
2215 [/* Define if all C++11 floating point overloads are available in <math.h>. */
2216 #if __cplusplus >= 201103L
2217 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
2218 #endif])
2220 if test $glibcxx_cv_math11_fp_overload = yes; then
2221 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_FP)
2222 fi
2223 AC_MSG_RESULT([$glibcxx_cv_math11_fp_overload])
2225 # Solaris 12 Build 90, Solaris 11.3 SRU 5.6, and Solaris 10 Patch
2226 # 11996[67]-02 introduced the C++11 <math.h> integral type overloads.
2227 AC_MSG_CHECKING([for C++11 <math.h> integral type overloads])
2228 AC_CACHE_VAL(glibcxx_cv_math11_int_overload, [
2229 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2230 [#include <math.h>
2231 namespace std {
2232 template<typename _Tp>
2233 struct __is_integer;
2234 template<>
2235 struct __is_integer<int>
2236 {
2237 enum { __value = 1 };
2238 };
2239 }
2240 namespace __gnu_cxx {
2241 template<bool, typename>
2242 struct __enable_if;
2243 template<typename _Tp>
2244 struct __enable_if<true, _Tp>
2245 { typedef _Tp __type; };
2246 }
2247 namespace std {
2248 template<typename _Tp>
2249 constexpr typename __gnu_cxx::__enable_if
2250 <__is_integer<_Tp>::__value, double>::__type
2251 log2(_Tp __x)
2252 { return __builtin_log2(__x); }
2253 }
2254 int
2255 main (void)
2256 {
2257 int i = 1000;
2258 return std::log2(i);
2259 }
2260 ])],
2261 [glibcxx_cv_math11_int_overload=no],
2262 [glibcxx_cv_math11_int_overload=yes]
2263 )])
2265 # autoheader cannot handle indented templates.
2266 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_INT],
2267 [/* Define if all C++11 integral type overloads are available in <math.h>. */
2268 #if __cplusplus >= 201103L
2269 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
2270 #endif])
2272 if test $glibcxx_cv_math11_int_overload = yes; then
2273 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_INT)
2274 fi
2275 AC_MSG_RESULT([$glibcxx_cv_math11_int_overload])
2276 ;;
2277 *)
2278 # If <math.h> defines the obsolete isinf(double) and isnan(double)
2279 # functions (instead of or as well as the C99 generic macros) then we
2280 # can't define std::isinf(double) and std::isnan(double) in <cmath>
2281 # and must use the ones from <math.h> instead.
2282 AC_MSG_CHECKING([for obsolete isinf function in <math.h>])
2283 AC_CACHE_VAL(glibcxx_cv_obsolete_isinf, [
2284 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2285 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2286 #include <math.h>
2287 #undef isinf
2288 namespace std {
2289 using ::isinf;
2290 bool isinf(float);
2291 bool isinf(long double);
2292 }
2293 using std::isinf;
2294 bool b = isinf(0.0);
2295 ])],
2296 [glibcxx_cv_obsolete_isinf=yes],
2297 [glibcxx_cv_obsolete_isinf=no]
2298 )])
2299 AC_MSG_RESULT([$glibcxx_cv_obsolete_isinf])
2300 if test $glibcxx_cv_obsolete_isinf = yes; then
2301 AC_DEFINE(HAVE_OBSOLETE_ISINF, 1,
2302 [Define if <math.h> defines obsolete isinf function.])
2303 fi
2305 AC_MSG_CHECKING([for obsolete isnan function in <math.h>])
2306 AC_CACHE_VAL(glibcxx_cv_obsolete_isnan, [
2307 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2308 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2309 #include <math.h>
2310 #undef isnan
2311 namespace std {
2312 using ::isnan;
2313 bool isnan(float);
2314 bool isnan(long double);
2315 }
2316 using std::isnan;
2317 bool b = isnan(0.0);
2318 ])],
2319 [glibcxx_cv_obsolete_isnan=yes],
2320 [glibcxx_cv_obsolete_isnan=no]
2321 )])
2322 AC_MSG_RESULT([$glibcxx_cv_obsolete_isnan])
2323 if test $glibcxx_cv_obsolete_isnan = yes; then
2324 AC_DEFINE(HAVE_OBSOLETE_ISNAN, 1,
2325 [Define if <math.h> defines obsolete isnan function.])
2326 fi
2327 ;;
2328 esac
2330 CXXFLAGS="$ac_save_CXXFLAGS"
2331 AC_LANG_RESTORE
2332 ])
2334 dnl
2335 dnl Check whether macros, etc are present for <system_error>
2336 dnl
2337 AC_DEFUN([GLIBCXX_CHECK_SYSTEM_ERROR], [
2339 m4_pushdef([n_syserr], [1])dnl
2340 m4_foreach([syserr], [EOWNERDEAD, ENOTRECOVERABLE, ENOLINK, EPROTO, ENODATA,
2341 ENOSR, ENOSTR, ETIME, EBADMSG, ECANCELED,
2342 EOVERFLOW, ENOTSUP, EIDRM, ETXTBSY,
2343 ECHILD, ENOSPC, EPERM,
2344 ETIMEDOUT, EWOULDBLOCK],
2345 [m4_pushdef([SYSERR], m4_toupper(syserr))dnl
2346 AC_MSG_CHECKING([for syserr])
2347 AC_CACHE_VAL([glibcxx_cv_system_error[]n_syserr], [
2348 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <errno.h>]],
2349 [int i = syserr;])],
2350 [glibcxx_cv_system_error[]n_syserr=yes],
2351 [glibcxx_cv_system_error[]n_syserr=no])
2352 ])
2353 AC_MSG_RESULT([$glibcxx_cv_system_error[]n_syserr])
2354 if test x"$glibcxx_cv_system_error[]n_syserr" = x"yes"; then
2355 AC_DEFINE([HAVE_]SYSERR, 1, [Define if ]syserr[ exists.])
2356 fi
2357 m4_define([n_syserr], m4_incr(n_syserr))dnl
2358 m4_popdef([SYSERR])dnl
2359 ])
2360 m4_popdef([n_syserr])dnl
2361 ])
2363 dnl
2364 dnl Check for what type of C headers to use.
2365 dnl
2366 dnl --enable-cheaders= [does stuff].
2367 dnl --disable-cheaders [does not do anything, really].
2368 dnl + Usage: GLIBCXX_ENABLE_CHEADERS[(DEFAULT)]
2369 dnl Where DEFAULT is either 'c' or 'c_std' or 'c_global'.
2370 dnl
2371 AC_DEFUN([GLIBCXX_ENABLE_CHEADERS], [
2372 GLIBCXX_ENABLE(cheaders,$1,[[[=KIND]]],
2373 [construct "C" headers for g++], [permit c|c_std|c_global])
2374 AC_MSG_NOTICE("C" header strategy set to $enable_cheaders)
2376 C_INCLUDE_DIR='${glibcxx_srcdir}/include/'$enable_cheaders
2378 # Allow overrides to configure.host here.
2379 if test $enable_cheaders = c_global; then
2380 c_compatibility=yes
2381 fi
2383 AC_SUBST(C_INCLUDE_DIR)
2384 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C, test $enable_cheaders = c)
2385 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_STD, test $enable_cheaders = c_std)
2386 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_GLOBAL, test $enable_cheaders = c_global)
2387 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_COMPATIBILITY, test $c_compatibility = yes)
2388 ])
2391 dnl
2392 dnl Check for which locale library to use. The choice is mapped to
2393 dnl a subdirectory of config/locale.
2394 dnl
2395 dnl Default is generic.
2396 dnl
2397 AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
2398 GLIBCXX_ENABLE(clocale,auto,[[[=MODEL]]],
2399 [use MODEL for target locale package],
2400 [permit generic|gnu|ieee_1003.1-2001|newlib|yes|no|auto])
2402 # Deal with gettext issues. Default to not using it (=no) until we detect
2403 # support for it later. Let the user turn it off via --e/d, but let that
2404 # default to on for easier handling.
2405 USE_NLS=no
2406 AC_ARG_ENABLE(nls,
2407 AC_HELP_STRING([--enable-nls],[use Native Language Support (default)]),
2408 [],
2409 [enable_nls=yes])
2411 # Either a known package, or "auto"
2412 if test $enable_clocale = no || test $enable_clocale = yes; then
2413 enable_clocale=auto
2414 fi
2415 enable_clocale_flag=$enable_clocale
2417 # Probe for locale model to use if none specified.
2418 # Default to "generic".
2419 if test $enable_clocale_flag = auto; then
2420 case ${target_os} in
2421 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2422 enable_clocale_flag=gnu
2423 ;;
2424 darwin*)
2425 enable_clocale_flag=darwin
2426 ;;
2427 dragonfly* | freebsd*)
2428 enable_clocale_flag=dragonfly
2429 ;;
2430 openbsd*)
2431 enable_clocale_flag=newlib
2432 ;;
2433 *)
2434 if test x"$with_newlib" = x"yes"; then
2435 enable_clocale_flag=newlib
2436 else
2437 enable_clocale_flag=generic
2438 fi
2439 ;;
2440 esac
2441 fi
2443 # Sanity check model, and test for special functionality.
2444 if test $enable_clocale_flag = gnu; then
2445 AC_EGREP_CPP([_GLIBCXX_ok], [
2446 #include <features.h>
2447 #if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined(__UCLIBC__)
2448 _GLIBCXX_ok
2449 #endif
2450 ], enable_clocale_flag=gnu, enable_clocale_flag=generic)
2452 # Set it to scream when it hurts.
2453 ac_save_CFLAGS="$CFLAGS"
2454 CFLAGS="-Wimplicit-function-declaration -Werror"
2456 # Use strxfrm_l if available.
2457 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2458 #include <string.h>
2459 #include <locale.h>],
2460 [char s[128]; __locale_t loc; strxfrm_l(s, "C", 5, loc);],
2461 AC_DEFINE(HAVE_STRXFRM_L, 1,
2462 [Define if strxfrm_l is available in <string.h>.]),)
2464 # Use strerror_l if available.
2465 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2466 #include <string.h>
2467 #include <locale.h>],
2468 [__locale_t loc; strerror_l(5, loc);],
2469 AC_DEFINE(HAVE_STRERROR_L, 1,
2470 [Define if strerror_l is available in <string.h>.]),)
2472 CFLAGS="$ac_save_CFLAGS"
2473 fi
2475 # Perhaps use strerror_r if available, and strerror_l isn't.
2476 ac_save_CFLAGS="$CFLAGS"
2477 CFLAGS="-Wimplicit-function-declaration -Werror"
2478 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2479 #include <string.h>
2480 #include <locale.h>],
2481 [char s[128]; strerror_r(5, s, 128);],
2482 AC_DEFINE(HAVE_STRERROR_R, 1,
2483 [Define if strerror_r is available in <string.h>.]),)
2484 CFLAGS="$ac_save_CFLAGS"
2486 # Set configure bits for specified locale package
2487 AC_MSG_CHECKING([for C locale to use])
2488 case ${enable_clocale_flag} in
2489 generic)
2490 AC_MSG_RESULT(generic)
2492 CLOCALE_H=config/locale/generic/c_locale.h
2493 CLOCALE_CC=config/locale/generic/c_locale.cc
2494 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2495 CCOLLATE_CC=config/locale/generic/collate_members.cc
2496 CCTYPE_CC=config/locale/generic/ctype_members.cc
2497 CMESSAGES_H=config/locale/generic/messages_members.h
2498 CMESSAGES_CC=config/locale/generic/messages_members.cc
2499 CMONEY_CC=config/locale/generic/monetary_members.cc
2500 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2501 CTIME_H=config/locale/generic/time_members.h
2502 CTIME_CC=config/locale/generic/time_members.cc
2503 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2504 ;;
2505 darwin)
2506 AC_MSG_RESULT(darwin)
2508 CLOCALE_H=config/locale/generic/c_locale.h
2509 CLOCALE_CC=config/locale/generic/c_locale.cc
2510 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2511 CCOLLATE_CC=config/locale/generic/collate_members.cc
2512 CCTYPE_CC=config/locale/darwin/ctype_members.cc
2513 CMESSAGES_H=config/locale/generic/messages_members.h
2514 CMESSAGES_CC=config/locale/generic/messages_members.cc
2515 CMONEY_CC=config/locale/generic/monetary_members.cc
2516 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2517 CTIME_H=config/locale/generic/time_members.h
2518 CTIME_CC=config/locale/generic/time_members.cc
2519 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2520 ;;
2522 dragonfly)
2523 AC_MSG_RESULT(dragonfly or freebsd)
2525 CLOCALE_H=config/locale/dragonfly/c_locale.h
2526 CLOCALE_CC=config/locale/dragonfly/c_locale.cc
2527 CCODECVT_CC=config/locale/dragonfly/codecvt_members.cc
2528 CCOLLATE_CC=config/locale/dragonfly/collate_members.cc
2529 CCTYPE_CC=config/locale/dragonfly/ctype_members.cc
2530 CMESSAGES_H=config/locale/generic/messages_members.h
2531 CMESSAGES_CC=config/locale/generic/messages_members.cc
2532 CMONEY_CC=config/locale/dragonfly/monetary_members.cc
2533 CNUMERIC_CC=config/locale/dragonfly/numeric_members.cc
2534 CTIME_H=config/locale/dragonfly/time_members.h
2535 CTIME_CC=config/locale/dragonfly/time_members.cc
2536 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2537 ;;
2539 gnu)
2540 AC_MSG_RESULT(gnu)
2542 # Declare intention to use gettext, and add support for specific
2543 # languages.
2544 # For some reason, ALL_LINGUAS has to be before AM-GNU-GETTEXT
2545 ALL_LINGUAS="de fr"
2547 # Don't call AM-GNU-GETTEXT here. Instead, assume glibc.
2548 AC_CHECK_PROG(check_msgfmt, msgfmt, yes, no)
2549 if test x"$check_msgfmt" = x"yes" && test x"$enable_nls" = x"yes"; then
2550 USE_NLS=yes
2551 fi
2552 # Export the build objects.
2553 for ling in $ALL_LINGUAS; do \
2554 glibcxx_MOFILES="$glibcxx_MOFILES $ling.mo"; \
2555 glibcxx_POFILES="$glibcxx_POFILES $ling.po"; \
2556 done
2557 AC_SUBST(glibcxx_MOFILES)
2558 AC_SUBST(glibcxx_POFILES)
2560 CLOCALE_H=config/locale/gnu/c_locale.h
2561 CLOCALE_CC=config/locale/gnu/c_locale.cc
2562 CCODECVT_CC=config/locale/gnu/codecvt_members.cc
2563 CCOLLATE_CC=config/locale/gnu/collate_members.cc
2564 CCTYPE_CC=config/locale/gnu/ctype_members.cc
2565 CMESSAGES_H=config/locale/gnu/messages_members.h
2566 CMESSAGES_CC=config/locale/gnu/messages_members.cc
2567 CMONEY_CC=config/locale/gnu/monetary_members.cc
2568 CNUMERIC_CC=config/locale/gnu/numeric_members.cc
2569 CTIME_H=config/locale/gnu/time_members.h
2570 CTIME_CC=config/locale/gnu/time_members.cc
2571 CLOCALE_INTERNAL_H=config/locale/gnu/c++locale_internal.h
2572 ;;
2573 ieee_1003.1-2001)
2574 AC_MSG_RESULT(IEEE 1003.1)
2576 CLOCALE_H=config/locale/ieee_1003.1-2001/c_locale.h
2577 CLOCALE_CC=config/locale/ieee_1003.1-2001/c_locale.cc
2578 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2579 CCOLLATE_CC=config/locale/generic/collate_members.cc
2580 CCTYPE_CC=config/locale/generic/ctype_members.cc
2581 CMESSAGES_H=config/locale/ieee_1003.1-2001/messages_members.h
2582 CMESSAGES_CC=config/locale/ieee_1003.1-2001/messages_members.cc
2583 CMONEY_CC=config/locale/generic/monetary_members.cc
2584 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2585 CTIME_H=config/locale/generic/time_members.h
2586 CTIME_CC=config/locale/generic/time_members.cc
2587 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2588 ;;
2589 newlib)
2590 AC_MSG_RESULT(newlib)
2592 CLOCALE_H=config/locale/generic/c_locale.h
2593 CLOCALE_CC=config/locale/generic/c_locale.cc
2594 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2595 CCOLLATE_CC=config/locale/generic/collate_members.cc
2596 CCTYPE_CC=config/locale/newlib/ctype_members.cc
2597 CMESSAGES_H=config/locale/generic/messages_members.h
2598 CMESSAGES_CC=config/locale/generic/messages_members.cc
2599 CMONEY_CC=config/locale/generic/monetary_members.cc
2600 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2601 CTIME_H=config/locale/generic/time_members.h
2602 CTIME_CC=config/locale/generic/time_members.cc
2603 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2604 ;;
2605 esac
2607 # This is where the testsuite looks for locale catalogs, using the
2608 # -DLOCALEDIR define during testsuite compilation.
2609 glibcxx_localedir=${glibcxx_builddir}/po/share/locale
2610 AC_SUBST(glibcxx_localedir)
2612 # A standalone libintl (e.g., GNU libintl) may be in use.
2613 if test $USE_NLS = yes; then
2614 AC_CHECK_HEADERS([libintl.h], [], USE_NLS=no)
2615 AC_SEARCH_LIBS(gettext, intl, [], USE_NLS=no)
2616 fi
2617 if test $USE_NLS = yes; then
2618 AC_DEFINE(_GLIBCXX_USE_NLS, 1,
2619 [Define if NLS translations are to be used.])
2620 fi
2622 AC_SUBST(USE_NLS)
2623 AC_SUBST(CLOCALE_H)
2624 AC_SUBST(CMESSAGES_H)
2625 AC_SUBST(CCODECVT_CC)
2626 AC_SUBST(CCOLLATE_CC)
2627 AC_SUBST(CCTYPE_CC)
2628 AC_SUBST(CMESSAGES_CC)
2629 AC_SUBST(CMONEY_CC)
2630 AC_SUBST(CNUMERIC_CC)
2631 AC_SUBST(CTIME_H)
2632 AC_SUBST(CTIME_CC)
2633 AC_SUBST(CLOCALE_CC)
2634 AC_SUBST(CLOCALE_INTERNAL_H)
2635 ])
2638 dnl
2639 dnl Check for which std::allocator base class to use. The choice is
2640 dnl mapped from a subdirectory of include/ext.
2641 dnl
2642 dnl Default is new.
2643 dnl
2644 AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
2645 AC_MSG_CHECKING([for std::allocator base class])
2646 GLIBCXX_ENABLE(libstdcxx-allocator,auto,[[[=KIND]]],
2647 [use KIND for target std::allocator base],
2648 [permit new|malloc|mt|bitmap|pool|yes|no|auto])
2650 # If they didn't use this option switch, or if they specified --enable
2651 # with no specific model, we'll have to look for one. If they
2652 # specified --disable (???), do likewise.
2653 if test $enable_libstdcxx_allocator = no ||
2654 test $enable_libstdcxx_allocator = yes;
2655 then
2656 enable_libstdcxx_allocator=auto
2657 fi
2659 # Either a known package, or "auto". Auto implies the default choice
2660 # for a particular platform.
2661 enable_libstdcxx_allocator_flag=$enable_libstdcxx_allocator
2663 # Probe for host-specific support if no specific model is specified.
2664 # Default to "new".
2665 if test $enable_libstdcxx_allocator_flag = auto; then
2666 case ${target_os} in
2667 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2668 enable_libstdcxx_allocator_flag=new
2669 ;;
2670 *)
2671 enable_libstdcxx_allocator_flag=new
2672 ;;
2673 esac
2674 fi
2675 AC_MSG_RESULT($enable_libstdcxx_allocator_flag)
2678 # Set configure bits for specified locale package
2679 case ${enable_libstdcxx_allocator_flag} in
2680 bitmap)
2681 ALLOCATOR_H=config/allocator/bitmap_allocator_base.h
2682 ALLOCATOR_NAME=__gnu_cxx::bitmap_allocator
2683 ;;
2684 malloc)
2685 ALLOCATOR_H=config/allocator/malloc_allocator_base.h
2686 ALLOCATOR_NAME=__gnu_cxx::malloc_allocator
2687 ;;
2688 mt)
2689 ALLOCATOR_H=config/allocator/mt_allocator_base.h
2690 ALLOCATOR_NAME=__gnu_cxx::__mt_alloc
2691 ;;
2692 new)
2693 ALLOCATOR_H=config/allocator/new_allocator_base.h
2694 ALLOCATOR_NAME=__gnu_cxx::new_allocator
2695 ;;
2696 pool)
2697 ALLOCATOR_H=config/allocator/pool_allocator_base.h
2698 ALLOCATOR_NAME=__gnu_cxx::__pool_alloc
2699 ;;
2700 esac
2702 GLIBCXX_CONDITIONAL(ENABLE_ALLOCATOR_NEW,
2703 test $enable_libstdcxx_allocator_flag = new)
2704 AC_SUBST(ALLOCATOR_H)
2705 AC_SUBST(ALLOCATOR_NAME)
2706 ])
2709 dnl
2710 dnl Check for whether the Boost-derived checks should be turned on.
2711 dnl
2712 dnl --enable-concept-checks turns them on.
2713 dnl --disable-concept-checks leaves them off.
2714 dnl + Usage: GLIBCXX_ENABLE_CONCEPT_CHECKS[(DEFAULT)]
2715 dnl Where DEFAULT is either `yes' or `no'.
2716 dnl
2717 AC_DEFUN([GLIBCXX_ENABLE_CONCEPT_CHECKS], [
2718 GLIBCXX_ENABLE(concept-checks,$1,,[use Boost-derived template checks])
2719 if test $enable_concept_checks = yes; then
2720 AC_DEFINE(_GLIBCXX_CONCEPT_CHECKS, 1,
2721 [Define to use concept checking code from the boost libraries.])
2722 fi
2723 ])
2725 dnl
2726 dnl Use extern templates.
2727 dnl
2728 dnl --enable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 1
2729 dnl --disable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 0
2731 dnl + Usage: GLIBCXX_ENABLE_TEMPLATE[(DEFAULT)]
2732 dnl Where DEFAULT is `yes' or `no'.
2733 dnl
2734 AC_DEFUN([GLIBCXX_ENABLE_EXTERN_TEMPLATE], [
2736 GLIBCXX_ENABLE(extern-template,$1,,[enable extern template])
2738 AC_MSG_CHECKING([for extern template support])
2739 AC_MSG_RESULT([$enable_extern_template])
2741 GLIBCXX_CONDITIONAL(ENABLE_EXTERN_TEMPLATE, test $enable_extern_template = yes)
2742 ])
2744 dnl
2745 dnl Use vtable verification.
2746 dnl
2747 dnl --enable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 1
2748 dnl --disable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 0
2750 dnl + Usage: GLIBCXX_ENABLE_VTABLE_VERIFY[(DEFAULT)]
2751 dnl Where DEFAULT is `yes' or `no'.
2752 dnl
2753 AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY], [
2755 GLIBCXX_ENABLE(vtable-verify,$1,,[enable vtable verify])
2757 AC_MSG_CHECKING([for vtable verify support])
2758 AC_MSG_RESULT([$enable_vtable_verify])
2760 vtv_cygmin=no
2761 if test $enable_vtable_verify = yes; then
2762 case ${target_os} in
2763 cygwin*|mingw32*)
2764 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2765 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2766 vtv_cygmin=yes
2767 ;;
2768 darwin*)
2769 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u,_vtable_map_vars_start -Wl,-u,_vtable_map_vars_end"
2770 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-rpath,${toplevel_builddir}/libvtv/.libs"
2771 ;;
2772 solaris2*)
2773 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2774 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-R -Wl,${toplevel_builddir}/libvtv/.libs"
2775 ;;
2776 *)
2777 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2778 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2779 ;;
2780 esac
2781 VTV_PCH_CXXFLAGS="-fvtable-verify=std"
2782 else
2783 VTV_CXXFLAGS=
2784 VTV_PCH_CXXFLAGS=
2785 VTV_CXXLINKFLAGS=
2786 fi
2788 AC_SUBST(VTV_CXXFLAGS)
2789 AC_SUBST(VTV_PCH_CXXFLAGS)
2790 AC_SUBST(VTV_CXXLINKFLAGS)
2791 AM_CONDITIONAL(VTV_CYGMIN, test x$vtv_cygmin = xyes)
2792 GLIBCXX_CONDITIONAL(ENABLE_VTABLE_VERIFY, test $enable_vtable_verify = yes)
2793 ])
2795 dnl
2796 dnl Check for parallel mode pre-requisites, including OpenMP support.
2797 dnl
2798 dnl + Usage: GLIBCXX_ENABLE_PARALLEL
2799 dnl
2800 AC_DEFUN([GLIBCXX_ENABLE_PARALLEL], [
2802 enable_parallel=no;
2804 # See if configured libgomp/omp.h exists. (libgomp may be in
2805 # noconfigdirs but not explicitly disabled.)
2806 if echo " ${TARGET_CONFIGDIRS} " | grep " libgomp " > /dev/null 2>&1 ; then
2807 enable_parallel=yes;
2808 else
2809 AC_MSG_NOTICE([target-libgomp not built])
2810 fi
2812 AC_MSG_CHECKING([for parallel mode support])
2813 AC_MSG_RESULT([$enable_parallel])
2814 ])
2817 dnl
2818 dnl Check for which I/O library to use: stdio, or something specific.
2819 dnl
2820 dnl Default is stdio.
2821 dnl
2822 AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
2823 AC_MSG_CHECKING([for underlying I/O to use])
2824 GLIBCXX_ENABLE(cstdio,stdio,[[[=PACKAGE]]],
2825 [use target-specific I/O package], [permit stdio])
2827 # Now that libio has been removed, you can have any color you want as long
2828 # as it's black. This is one big no-op until other packages are added, but
2829 # showing the framework never hurts.
2830 case ${enable_cstdio} in
2831 stdio)
2832 CSTDIO_H=config/io/c_io_stdio.h
2833 BASIC_FILE_H=config/io/basic_file_stdio.h
2834 BASIC_FILE_CC=config/io/basic_file_stdio.cc
2835 AC_MSG_RESULT(stdio)
2836 ;;
2837 esac
2839 AC_SUBST(CSTDIO_H)
2840 AC_SUBST(BASIC_FILE_H)
2841 AC_SUBST(BASIC_FILE_CC)
2842 ])
2845 dnl
2846 dnl Check for "unusual" flags to pass to the compiler while building.
2847 dnl
2848 dnl --enable-cxx-flags='-foo -bar -baz' is a general method for passing
2849 dnl experimental flags such as -fpch, -fIMI, -Dfloat=char, etc.
2850 dnl --disable-cxx-flags passes nothing.
2851 dnl + See http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00131.html
2852 dnl http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00284.html
2853 dnl http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00035.html
2854 dnl + Usage: GLIBCXX_ENABLE_CXX_FLAGS(default flags)
2855 dnl If "default flags" is an empty string, the effect is the same
2856 dnl as --disable or --enable=no.
2857 dnl
2858 AC_DEFUN([GLIBCXX_ENABLE_CXX_FLAGS], [dnl
2859 AC_MSG_CHECKING([for extra compiler flags for building])
2860 GLIBCXX_ENABLE(cxx-flags,$1,[=FLAGS],
2861 [pass compiler FLAGS when building library],
2862 [case "x$enable_cxx_flags" in
2863 xno | x) enable_cxx_flags= ;;
2864 x-*) ;;
2865 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2866 esac])
2868 # Run through flags (either default or command-line) and set anything
2869 # extra (e.g., #defines) that must accompany particular g++ options.
2870 if test -n "$enable_cxx_flags"; then
2871 for f in $enable_cxx_flags; do
2872 case "$f" in
2873 -fhonor-std) ;;
2874 -*) ;;
2875 *) # and we're trying to pass /what/ exactly?
2876 AC_MSG_ERROR([compiler flags start with a -]) ;;
2877 esac
2878 done
2879 fi
2881 EXTRA_CXX_FLAGS="$enable_cxx_flags"
2882 AC_MSG_RESULT($EXTRA_CXX_FLAGS)
2883 AC_SUBST(EXTRA_CXX_FLAGS)
2884 ])
2887 dnl
2888 dnl Check to see if debugging libraries are to be built.
2889 dnl
2890 dnl --enable-libstdcxx-debug
2891 dnl builds a separate set of debugging libraries in addition to the
2892 dnl normal (shared, static) libstdc++ binaries.
2893 dnl
2894 dnl --disable-libstdcxx-debug
2895 dnl builds only one (non-debug) version of libstdc++.
2896 dnl
2897 dnl --enable-libstdcxx-debug-flags=FLAGS
2898 dnl iff --enable-debug == yes, then use FLAGS to build the debug library.
2899 dnl
2900 dnl + Usage: GLIBCXX_ENABLE_DEBUG[(DEFAULT)]
2901 dnl Where DEFAULT is either `yes' or `no'.
2902 dnl
2903 AC_DEFUN([GLIBCXX_ENABLE_DEBUG], [
2904 AC_MSG_CHECKING([for additional debug build])
2905 skip_debug_build=
2906 GLIBCXX_ENABLE(libstdcxx-debug,$1,,[build extra debug library])
2907 if test x$enable_libstdcxx_debug = xyes; then
2908 if test -f $toplevel_builddir/../stage_final \
2909 && test -f $toplevel_builddir/../stage_current; then
2910 stage_final=`cat $toplevel_builddir/../stage_final`
2911 stage_current=`cat $toplevel_builddir/../stage_current`
2912 if test x$stage_current != x$stage_final ; then
2913 skip_debug_build=" (skipped for bootstrap stage $stage_current)"
2914 enable_libstdcxx_debug=no
2915 fi
2916 fi
2917 fi
2918 AC_MSG_RESULT($enable_libstdcxx_debug$skip_debug_build)
2919 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_DEBUG, test $enable_libstdcxx_debug = yes)
2920 ])
2923 dnl
2924 dnl Check for explicit debug flags.
2925 dnl
2926 dnl --enable-libstdcxx-debug-flags='-O1'
2927 dnl is a general method for passing flags to be used when
2928 dnl building debug libraries with --enable-libstdcxx-debug.
2929 dnl
2930 dnl --disable-libstdcxx-debug-flags does nothing.
2931 dnl + Usage: GLIBCXX_ENABLE_DEBUG_FLAGS(default flags)
2932 dnl If "default flags" is an empty string, the effect is the same
2933 dnl as --disable or --enable=no.
2934 dnl
2935 AC_DEFUN([GLIBCXX_ENABLE_DEBUG_FLAGS], [
2936 GLIBCXX_ENABLE(libstdcxx-debug-flags,[$1],[=FLAGS],
2937 [pass compiler FLAGS when building debug library],
2938 [case "x$enable_libstdcxx_debug_flags" in
2939 xno | x) enable_libstdcxx_debug_flags= ;;
2940 x-*) ;;
2941 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2942 esac])
2944 # Option parsed, now set things appropriately
2945 DEBUG_FLAGS="$enable_libstdcxx_debug_flags"
2946 AC_SUBST(DEBUG_FLAGS)
2948 AC_MSG_NOTICE([Debug build flags set to $DEBUG_FLAGS])
2949 ])
2952 dnl
2953 dnl Check if the user only wants a freestanding library implementation.
2954 dnl
2955 dnl --disable-hosted-libstdcxx will turn off most of the library build,
2956 dnl installing only the headers required by [17.4.1.3] and the language
2957 dnl support library. More than that will be built (to keep the Makefiles
2958 dnl conveniently clean), but not installed.
2959 dnl
2960 dnl Sets:
2961 dnl is_hosted (yes/no)
2962 dnl
2963 dnl Defines:
2964 dnl _GLIBCXX_HOSTED (always defined, either to 1 or 0)
2965 dnl
2966 AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
2967 AC_ARG_ENABLE([hosted-libstdcxx],
2968 AC_HELP_STRING([--disable-hosted-libstdcxx],
2969 [only build freestanding C++ runtime support]),,
2970 [case "$host" in
2971 arm*-*-symbianelf*)
2972 enable_hosted_libstdcxx=no
2973 ;;
2974 *)
2975 enable_hosted_libstdcxx=yes
2976 ;;
2977 esac])
2978 if test "$enable_hosted_libstdcxx" = no; then
2979 AC_MSG_NOTICE([Only freestanding libraries will be built])
2980 is_hosted=no
2981 hosted_define=0
2982 enable_abi_check=no
2983 enable_libstdcxx_pch=no
2984 else
2985 is_hosted=yes
2986 hosted_define=1
2987 fi
2988 GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
2989 AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
2990 [Define to 1 if a full hosted library is built, or 0 if freestanding.])
2991 ])
2994 dnl
2995 dnl Check if the user wants a non-verbose library implementation.
2996 dnl
2997 dnl --disable-libstdcxx-verbose will turn off descriptive messages to
2998 dnl standard error on termination.
2999 dnl
3000 dnl Defines:
3001 dnl _GLIBCXX_VERBOSE (always defined, either to 1 or 0)
3002 dnl
3003 AC_DEFUN([GLIBCXX_ENABLE_VERBOSE], [
3004 AC_ARG_ENABLE([libstdcxx-verbose],
3005 AC_HELP_STRING([--disable-libstdcxx-verbose],
3006 [disable termination messages to standard error]),,
3007 [enable_libstdcxx_verbose=yes])
3008 if test x"$enable_libstdcxx_verbose" = xyes; then
3009 verbose_define=1
3010 else
3011 AC_MSG_NOTICE([verbose termination messages are disabled])
3012 verbose_define=0
3013 fi
3014 AC_DEFINE_UNQUOTED(_GLIBCXX_VERBOSE, $verbose_define,
3015 [Define to 1 if a verbose library is built, or 0 otherwise.])
3016 ])
3019 dnl
3020 dnl Check for template specializations for the 'long long' type.
3021 dnl The result determines only whether 'long long' I/O is enabled; things
3022 dnl like numeric_limits<> specializations are always available.
3023 dnl
3024 dnl --enable-long-long defines _GLIBCXX_USE_LONG_LONG
3025 dnl --disable-long-long leaves _GLIBCXX_USE_LONG_LONG undefined
3026 dnl + Usage: GLIBCXX_ENABLE_LONG_LONG[(DEFAULT)]
3027 dnl Where DEFAULT is either `yes' or `no'.
3028 dnl
3029 AC_DEFUN([GLIBCXX_ENABLE_LONG_LONG], [
3030 GLIBCXX_ENABLE(long-long,$1,,[enable template specializations for 'long long'])
3031 if test $enable_long_long = yes; then
3032 AC_DEFINE(_GLIBCXX_USE_LONG_LONG, 1,
3033 [Define if code specialized for long long should be used.])
3034 fi
3035 AC_MSG_CHECKING([for enabled long long specializations])
3036 AC_MSG_RESULT([$enable_long_long])
3037 ])
3040 dnl
3041 dnl Check for decimal floating point.
3042 dnl See:
3043 dnl http://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float
3044 dnl
3045 dnl This checks to see if the host supports decimal floating point types.
3046 dnl
3047 dnl Defines:
3048 dnl _GLIBCXX_USE_DECIMAL_FLOAT
3049 dnl
3050 AC_DEFUN([GLIBCXX_ENABLE_DECIMAL_FLOAT], [
3052 # Fake what AC_TRY_COMPILE does, without linking as this is
3053 # unnecessary for this test.
3055 cat > conftest.$ac_ext << EOF
3056 [#]line __oline__ "configure"
3057 int main()
3058 {
3059 _Decimal32 d1;
3060 _Decimal64 d2;
3061 _Decimal128 d3;
3062 return 0;
3063 }
3064 EOF
3066 AC_MSG_CHECKING([for ISO/IEC TR 24733 ])
3067 if AC_TRY_EVAL(ac_compile); then
3068 AC_DEFINE(_GLIBCXX_USE_DECIMAL_FLOAT, 1,
3069 [Define if ISO/IEC TR 24733 decimal floating point types are supported on this host.])
3070 enable_dfp=yes
3071 else
3072 enable_dfp=no
3073 fi
3074 AC_MSG_RESULT($enable_dfp)
3075 rm -f conftest*
3076 ])
3078 dnl
3079 dnl Check for GNU 128-bit integer and floating point types.
3080 dnl
3081 dnl Note: also checks that the types aren't standard types.
3082 dnl
3083 dnl Defines:
3084 dnl _GLIBCXX_USE_INT128
3085 dnl ENABLE_FLOAT128
3086 dnl
3087 AC_DEFUN([GLIBCXX_ENABLE_INT128_FLOAT128], [
3089 AC_LANG_SAVE
3090 AC_LANG_CPLUSPLUS
3092 # Fake what AC_TRY_COMPILE does, without linking as this is
3093 # unnecessary for this test.
3095 cat > conftest.$ac_ext << EOF
3096 [#]line __oline__ "configure"
3097 template<typename T1, typename T2>
3098 struct same
3099 { typedef T2 type; };
3101 template<typename T>
3102 struct same<T, T>;
3104 int main()
3105 {
3106 typename same<long, __int128>::type i1;
3107 typename same<long long, __int128>::type i2;
3108 }
3109 EOF
3111 AC_MSG_CHECKING([for __int128])
3112 if AC_TRY_EVAL(ac_compile); then
3113 AC_DEFINE(_GLIBCXX_USE_INT128, 1,
3114 [Define if __int128 is supported on this host.])
3115 enable_int128=yes
3116 else
3117 enable_int128=no
3118 fi
3119 AC_MSG_RESULT($enable_int128)
3120 rm -f conftest*
3122 cat > conftest.$ac_ext << EOF
3123 [#]line __oline__ "configure"
3124 template<typename T1, typename T2>
3125 struct same
3126 { typedef T2 type; };
3128 template<typename T>
3129 struct same<T, T>;
3131 int main()
3132 {
3133 typename same<double, __float128>::type f1;
3134 typename same<long double, __float128>::type f2;
3135 }
3136 EOF
3138 AC_MSG_CHECKING([for __float128])
3139 if AC_TRY_EVAL(ac_compile); then
3140 enable_float128=yes
3141 else
3142 enable_float128=no
3143 fi
3144 AC_MSG_RESULT($enable_float128)
3145 GLIBCXX_CONDITIONAL(ENABLE_FLOAT128, test $enable_float128 = yes)
3146 rm -f conftest*
3148 AC_LANG_RESTORE
3149 ])
3151 dnl
3152 dnl Check for template specializations for the 'wchar_t' type.
3153 dnl
3154 dnl --enable-wchar_t defines _GLIBCXX_USE_WCHAR_T
3155 dnl --disable-wchar_t leaves _GLIBCXX_USE_WCHAR_T undefined
3156 dnl + Usage: GLIBCXX_ENABLE_WCHAR_T[(DEFAULT)]
3157 dnl Where DEFAULT is either `yes' or `no'.
3158 dnl
3159 dnl Necessary support must also be present.
3160 dnl
3161 AC_DEFUN([GLIBCXX_ENABLE_WCHAR_T], [
3162 GLIBCXX_ENABLE(wchar_t,$1,,[enable template specializations for 'wchar_t'])
3164 # Test wchar.h for mbstate_t, which is needed for char_traits and fpos.
3165 AC_CHECK_HEADERS(wchar.h, ac_has_wchar_h=yes, ac_has_wchar_h=no)
3166 AC_MSG_CHECKING([for mbstate_t])
3167 AC_TRY_COMPILE([#include <wchar.h>],
3168 [mbstate_t teststate;],
3169 have_mbstate_t=yes, have_mbstate_t=no)
3170 AC_MSG_RESULT($have_mbstate_t)
3171 if test x"$have_mbstate_t" = xyes; then
3172 AC_DEFINE(HAVE_MBSTATE_T,1,[Define if mbstate_t exists in wchar.h.])
3173 fi
3175 # Test it always, for use in GLIBCXX_ENABLE_C99, together with
3176 # ac_has_wchar_h.
3177 AC_CHECK_HEADERS(wctype.h, ac_has_wctype_h=yes, ac_has_wctype_h=no)
3179 if test x"$enable_wchar_t" = x"yes"; then
3181 AC_LANG_SAVE
3182 AC_LANG_CPLUSPLUS
3184 if test x"$ac_has_wchar_h" = xyes &&
3185 test x"$ac_has_wctype_h" = xyes; then
3186 AC_TRY_COMPILE([#include <wchar.h>
3187 #include <stddef.h>
3188 wint_t i;
3189 long l = WEOF;
3190 long j = WCHAR_MIN;
3191 long k = WCHAR_MAX;
3192 namespace test
3193 {
3194 using ::btowc;
3195 using ::fgetwc;
3196 using ::fgetws;
3197 using ::fputwc;
3198 using ::fputws;
3199 using ::fwide;
3200 using ::fwprintf;
3201 using ::fwscanf;
3202 using ::getwc;
3203 using ::getwchar;
3204 using ::mbrlen;
3205 using ::mbrtowc;
3206 using ::mbsinit;
3207 using ::mbsrtowcs;
3208 using ::putwc;
3209 using ::putwchar;
3210 using ::swprintf;
3211 using ::swscanf;
3212 using ::ungetwc;
3213 using ::vfwprintf;
3214 using ::vswprintf;
3215 using ::vwprintf;
3216 using ::wcrtomb;
3217 using ::wcscat;
3218 using ::wcschr;
3219 using ::wcscmp;
3220 using ::wcscoll;
3221 using ::wcscpy;
3222 using ::wcscspn;
3223 using ::wcsftime;
3224 using ::wcslen;
3225 using ::wcsncat;
3226 using ::wcsncmp;
3227 using ::wcsncpy;
3228 using ::wcspbrk;
3229 using ::wcsrchr;
3230 using ::wcsrtombs;
3231 using ::wcsspn;
3232 using ::wcsstr;
3233 using ::wcstod;
3234 using ::wcstok;
3235 using ::wcstol;
3236 using ::wcstoul;
3237 using ::wcsxfrm;
3238 using ::wctob;
3239 using ::wmemchr;
3240 using ::wmemcmp;
3241 using ::wmemcpy;
3242 using ::wmemmove;
3243 using ::wmemset;
3244 using ::wprintf;
3245 using ::wscanf;
3246 }
3247 ],[],[], [enable_wchar_t=no])
3248 else
3249 enable_wchar_t=no
3250 fi
3252 AC_LANG_RESTORE
3253 fi
3255 if test x"$enable_wchar_t" = x"yes"; then
3256 AC_DEFINE(_GLIBCXX_USE_WCHAR_T, 1,
3257 [Define if code specialized for wchar_t should be used.])
3258 fi
3260 AC_MSG_CHECKING([for enabled wchar_t specializations])
3261 AC_MSG_RESULT([$enable_wchar_t])
3262 ])
3265 dnl
3266 dnl Check to see if building and using a C++ precompiled header can be done.
3267 dnl
3268 dnl --enable-libstdcxx-pch=yes
3269 dnl default, this shows intent to use stdc++.h.gch If it looks like it
3270 dnl may work, after some light-hearted attempts to puzzle out compiler
3271 dnl support, flip bits on in include/Makefile.am
3272 dnl
3273 dnl --disable-libstdcxx-pch
3274 dnl turns off attempts to use or build stdc++.h.gch.
3275 dnl
3276 dnl Substs:
3277 dnl glibcxx_PCHFLAGS
3278 dnl
3279 AC_DEFUN([GLIBCXX_ENABLE_PCH], [
3280 GLIBCXX_ENABLE(libstdcxx-pch,$1,,[build pre-compiled libstdc++ headers])
3281 if test $enable_libstdcxx_pch = yes; then
3282 AC_CACHE_CHECK([for compiler with PCH support],
3283 [glibcxx_cv_prog_CXX_pch],
3284 [ac_save_CXXFLAGS="$CXXFLAGS"
3285 CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
3286 AC_LANG_SAVE
3287 AC_LANG_CPLUSPLUS
3288 echo '#include <math.h>' > conftest.h
3289 if $CXX $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
3290 -o conftest.h.gch 1>&5 2>&1 &&
3291 echo '#error "pch failed"' > conftest.h &&
3292 echo '#include "conftest.h"' > conftest.cc &&
3293 $CXX -c $CXXFLAGS $CPPFLAGS conftest.cc 1>&5 2>&1 ;
3294 then
3295 glibcxx_cv_prog_CXX_pch=yes
3296 else
3297 glibcxx_cv_prog_CXX_pch=no
3298 fi
3299 rm -f conftest*
3300 CXXFLAGS=$ac_save_CXXFLAGS
3301 AC_LANG_RESTORE
3302 ])
3303 enable_libstdcxx_pch=$glibcxx_cv_prog_CXX_pch
3304 fi
3306 AC_MSG_CHECKING([for enabled PCH])
3307 AC_MSG_RESULT([$enable_libstdcxx_pch])
3309 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_PCH, test $enable_libstdcxx_pch = yes)
3310 if test $enable_libstdcxx_pch = yes; then
3311 glibcxx_PCHFLAGS="-include bits/stdc++.h"
3312 else
3313 glibcxx_PCHFLAGS=""
3314 fi
3315 AC_SUBST(glibcxx_PCHFLAGS)
3316 ])
3319 dnl
3320 dnl Check for atomic builtins.
3321 dnl See:
3322 dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
3323 dnl
3324 dnl This checks to see if the host supports the compiler-generated
3325 dnl builtins for atomic operations for various integral sizes. Note, this
3326 dnl is intended to be an all-or-nothing switch, so all the atomic operations
3327 dnl that are used should be checked.
3328 dnl
3329 dnl Note:
3330 dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
3331 dnl
3332 AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
3333 AC_LANG_SAVE
3334 AC_LANG_CPLUSPLUS
3335 old_CXXFLAGS="$CXXFLAGS"
3337 # Do link tests if possible, instead asm tests, limited to some platforms
3338 # see discussion in PR target/40134, PR libstdc++/40133 and the thread
3339 # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
3340 atomic_builtins_link_tests=no
3341 if test x$gcc_no_link != xyes; then
3342 # Can do link tests. Limit to some tested platforms
3343 case "$host" in
3344 *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
3345 atomic_builtins_link_tests=yes
3346 ;;
3347 esac
3348 fi
3350 if test x$atomic_builtins_link_tests = xyes; then
3352 # Do link tests.
3354 CXXFLAGS="$CXXFLAGS -fno-exceptions"
3356 AC_MSG_CHECKING([for atomic builtins for bool])
3357 AC_CACHE_VAL(glibcxx_cv_atomic_bool, [
3358 AC_TRY_LINK(
3359 [ ],
3360 [typedef bool atomic_type;
3361 atomic_type c1;
3362 atomic_type c2;
3363 atomic_type c3(0);
3364 // N.B. __atomic_fetch_add is not supported for bool.
3365 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3366 __ATOMIC_RELAXED);
3367 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3368 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3369 ],
3370 [glibcxx_cv_atomic_bool=yes],
3371 [glibcxx_cv_atomic_bool=no])
3372 ])
3373 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3375 AC_MSG_CHECKING([for atomic builtins for short])
3376 AC_CACHE_VAL(glibcxx_cv_atomic_short, [
3377 AC_TRY_LINK(
3378 [ ],
3379 [typedef short atomic_type;
3380 atomic_type c1;
3381 atomic_type c2;
3382 atomic_type c3(0);
3383 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3384 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3385 __ATOMIC_RELAXED);
3386 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3387 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3388 ],
3389 [glibcxx_cv_atomic_short=yes],
3390 [glibcxx_cv_atomic_short=no])
3391 ])
3392 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3394 AC_MSG_CHECKING([for atomic builtins for int])
3395 AC_CACHE_VAL(glibcxx_cv_atomic_int, [
3396 AC_TRY_LINK(
3397 [ ],
3398 [typedef int atomic_type;
3399 atomic_type c1;
3400 atomic_type c2;
3401 atomic_type c3(0);
3402 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3403 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3404 __ATOMIC_RELAXED);
3405 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3406 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3407 ],
3408 [glibcxx_cv_atomic_int=yes],
3409 [glibcxx_cv_atomic_int=no])
3410 ])
3411 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3413 AC_MSG_CHECKING([for atomic builtins for long long])
3414 AC_CACHE_VAL(glibcxx_cv_atomic_long_long, [
3415 AC_TRY_LINK(
3416 [ ],
3417 [typedef long long atomic_type;
3418 atomic_type c1;
3419 atomic_type c2;
3420 atomic_type c3(0);
3421 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3422 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3423 __ATOMIC_RELAXED);
3424 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3425 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3426 ],
3427 [glibcxx_cv_atomic_long_long=yes],
3428 [glibcxx_cv_atomic_long_long=no])
3429 ])
3430 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3432 else
3434 # Do asm tests.
3436 # Compile unoptimized.
3437 CXXFLAGS='-O0 -S'
3439 # Fake what AC_TRY_COMPILE does.
3441 cat > conftest.$ac_ext << EOF
3442 [#]line __oline__ "configure"
3443 int main()
3444 {
3445 typedef bool atomic_type;
3446 atomic_type c1;
3447 atomic_type c2;
3448 atomic_type c3(0);
3449 // N.B. __atomic_fetch_add is not supported for bool.
3450 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3451 __ATOMIC_RELAXED);
3452 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3453 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3455 return 0;
3456 }
3457 EOF
3459 AC_MSG_CHECKING([for atomic builtins for bool])
3460 if AC_TRY_EVAL(ac_compile); then
3461 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3462 glibcxx_cv_atomic_bool=no
3463 else
3464 glibcxx_cv_atomic_bool=yes
3465 fi
3466 fi
3467 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3468 rm -f conftest*
3470 cat > conftest.$ac_ext << EOF
3471 [#]line __oline__ "configure"
3472 int main()
3473 {
3474 typedef short atomic_type;
3475 atomic_type c1;
3476 atomic_type c2;
3477 atomic_type c3(0);
3478 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3479 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3480 __ATOMIC_RELAXED);
3481 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3482 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3484 return 0;
3485 }
3486 EOF
3488 AC_MSG_CHECKING([for atomic builtins for short])
3489 if AC_TRY_EVAL(ac_compile); then
3490 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3491 glibcxx_cv_atomic_short=no
3492 else
3493 glibcxx_cv_atomic_short=yes
3494 fi
3495 fi
3496 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3497 rm -f conftest*
3499 cat > conftest.$ac_ext << EOF
3500 [#]line __oline__ "configure"
3501 int main()
3502 {
3503 // NB: _Atomic_word not necessarily int.
3504 typedef int atomic_type;
3505 atomic_type c1;
3506 atomic_type c2;
3507 atomic_type c3(0);
3508 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3509 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3510 __ATOMIC_RELAXED);
3511 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3512 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3514 return 0;
3515 }
3516 EOF
3518 AC_MSG_CHECKING([for atomic builtins for int])
3519 if AC_TRY_EVAL(ac_compile); then
3520 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3521 glibcxx_cv_atomic_int=no
3522 else
3523 glibcxx_cv_atomic_int=yes
3524 fi
3525 fi
3526 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3527 rm -f conftest*
3529 cat > conftest.$ac_ext << EOF
3530 [#]line __oline__ "configure"
3531 int main()
3532 {
3533 typedef long long atomic_type;
3534 atomic_type c1;
3535 atomic_type c2;
3536 atomic_type c3(0);
3537 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3538 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3539 __ATOMIC_RELAXED);
3540 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3541 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3543 return 0;
3544 }
3545 EOF
3547 AC_MSG_CHECKING([for atomic builtins for long long])
3548 if AC_TRY_EVAL(ac_compile); then
3549 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3550 glibcxx_cv_atomic_long_long=no
3551 else
3552 glibcxx_cv_atomic_long_long=yes
3553 fi
3554 fi
3555 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3556 rm -f conftest*
3558 fi
3560 CXXFLAGS="$old_CXXFLAGS"
3561 AC_LANG_RESTORE
3563 # Set atomicity_dir to builtins if all but the long long test above passes,
3564 # or if the builtins were already chosen (e.g. by configure.host).
3565 if { test "$glibcxx_cv_atomic_bool" = yes \
3566 && test "$glibcxx_cv_atomic_short" = yes \
3567 && test "$glibcxx_cv_atomic_int" = yes; } \
3568 || test "$atomicity_dir" = "cpu/generic/atomicity_builtins"; then
3569 AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS, 1,
3570 [Define if the compiler supports C++11 atomics.])
3571 atomicity_dir=cpu/generic/atomicity_builtins
3572 fi
3574 # If still generic, set to mutex.
3575 if test $atomicity_dir = "cpu/generic" ; then
3576 atomicity_dir=cpu/generic/atomicity_mutex
3577 AC_MSG_WARN([No native atomic operations are provided for this platform.])
3578 if test "x$target_thread_file" = xsingle; then
3579 AC_MSG_WARN([They cannot be faked when thread support is disabled.])
3580 AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
3581 else
3582 AC_MSG_WARN([They will be faked using a mutex.])
3583 AC_MSG_WARN([Performance of certain classes will degrade as a result.])
3584 fi
3585 fi
3587 ])
3589 dnl
3590 dnl Set default lock policy for synchronizing shared_ptr reference counting.
3591 dnl
3592 dnl --with-libstdcxx-lock-policy=auto
3593 dnl Use atomic operations for shared_ptr reference counting only if
3594 dnl the default target supports atomic compare-and-swap.
3595 dnl --with-libstdcxx-lock-policy=atomic
3596 dnl Use atomic operations for shared_ptr reference counting.
3597 dnl --with-libstdcxx-lock-policy=mutex
3598 dnl Use a mutex to synchronize shared_ptr reference counting.
3599 dnl
3600 dnl This controls the value of __gnu_cxx::__default_lock_policy, which
3601 dnl determines how shared_ptr reference counts are synchronized.
3602 dnl The option "atomic" means that atomic operations should be used,
3603 dnl "mutex" means that a mutex will be used. The default option, "auto",
3604 dnl will check if the target supports the compiler-generated builtins
3605 dnl for atomic compare-and-swap operations for 2-byte and 4-byte integers,
3606 dnl and will use "atomic" if supported, "mutex" otherwise.
3607 dnl This option is ignored if the thread model used by GCC is "single",
3608 dnl as no synchronization is used at all in that case.
3609 dnl This option affects the library ABI (except in the "single" thread model).
3610 dnl
3611 dnl Defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY to 1 if atomics should be used.
3612 dnl
3613 AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [
3615 AC_ARG_WITH([libstdcxx-lock-policy],
3616 AC_HELP_STRING([--with-libstdcxx-lock-policy={atomic,mutex,auto}],
3617 [synchronization policy for shared_ptr reference counting [default=auto]]),
3618 [libstdcxx_atomic_lock_policy=$withval],
3619 [libstdcxx_atomic_lock_policy=auto])
3621 case "$libstdcxx_atomic_lock_policy" in
3622 atomic|mutex|auto) ;;
3623 *) AC_MSG_ERROR([Invalid argument for --with-libstdcxx-lock-policy]) ;;
3624 esac
3625 AC_MSG_CHECKING([for lock policy for shared_ptr reference counts])
3627 if test x"$libstdcxx_atomic_lock_policy" = x"auto"; then
3628 AC_LANG_SAVE
3629 AC_LANG_CPLUSPLUS
3630 ac_save_CXXFLAGS="$CXXFLAGS"
3632 dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?!
3633 AC_TRY_COMPILE([
3634 #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
3635 # error "No 2-byte compare-and-swap"
3636 #elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
3637 # error "No 4-byte compare-and-swap"
3638 #endif
3639 ],,
3640 [libstdcxx_atomic_lock_policy=atomic],
3641 [libstdcxx_atomic_lock_policy=mutex])
3642 AC_LANG_RESTORE
3643 CXXFLAGS="$ac_save_CXXFLAGS"
3644 fi
3646 if test x"$libstdcxx_atomic_lock_policy" = x"atomic"; then
3647 AC_MSG_RESULT(atomic)
3648 AC_DEFINE(HAVE_ATOMIC_LOCK_POLICY,1,
3649 [Defined if shared_ptr reference counting should use atomic operations.])
3650 else
3651 AC_MSG_RESULT(mutex)
3652 fi
3654 ])
3656 dnl
3657 dnl Allow visibility attributes to be used on namespaces, objects, etc.
3658 dnl
3659 dnl --enable-libstdcxx-visibility enables attempt to use visibility attributes.
3660 dnl --disable-libstdcxx-visibility turns off all use of visibility attributes.
3661 dnl + Usage: GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY[(DEFAULT)]
3662 dnl Where DEFAULT is 'yes'.
3663 dnl
3664 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY], [
3665 GLIBCXX_ENABLE(libstdcxx-visibility,$1,,[enables visibility safe usage])
3667 if test x$enable_libstdcxx_visibility = xyes ; then
3668 dnl all hail libgfortran
3669 dnl Check whether the target supports hidden visibility.
3670 AC_CACHE_CHECK([whether the target supports hidden visibility],
3671 glibcxx_cv_have_attribute_visibility, [
3672 save_CFLAGS="$CFLAGS"
3673 CFLAGS="$CFLAGS -Werror"
3674 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
3675 [], glibcxx_cv_have_attribute_visibility=yes,
3676 glibcxx_cv_have_attribute_visibility=no)
3677 CFLAGS="$save_CFLAGS"])
3678 if test $glibcxx_cv_have_attribute_visibility = no; then
3679 enable_libstdcxx_visibility=no
3680 fi
3681 fi
3683 GLIBCXX_CONDITIONAL(ENABLE_VISIBILITY, test $enable_libstdcxx_visibility = yes)
3684 AC_MSG_NOTICE([visibility supported: $enable_libstdcxx_visibility])
3685 ])
3688 dnl
3689 dnl Add version tags to symbols in shared library (or not), additionally
3690 dnl marking other symbols as private/local (or not).
3691 dnl
3692 dnl Sets libtool_VERSION, and determines shared library SONAME.
3693 dnl
3694 dnl This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
3695 dnl
3696 dnl --enable-symvers=style adds a version script to the linker call when
3697 dnl creating the shared library. The choice of version script is
3698 dnl controlled by 'style'.
3699 dnl --disable-symvers does not.
3700 dnl
3701 dnl + Usage: GLIBCXX_ENABLE_SYMVERS[(DEFAULT)]
3702 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
3703 dnl choose a default style based on linker characteristics. Passing
3704 dnl 'no' disables versioning.
3705 dnl
3706 AC_DEFUN([GLIBCXX_ENABLE_SYMVERS], [
3708 GLIBCXX_ENABLE(symvers,$1,[[[=STYLE]]],
3709 [enables symbol versioning of the shared library],
3710 [permit yes|no|gnu|gnu-versioned-namespace|darwin|darwin-export|sun])
3712 # If we never went through the GLIBCXX_CHECK_LINKER_FEATURES macro, then we
3713 # don't know enough about $LD to do tricks...
3714 AC_REQUIRE([GLIBCXX_CHECK_LINKER_FEATURES])
3715 # Sun style symbol versions needs GNU c++filt for make_sunver.pl to work
3716 # with extern "C++" in version scripts.
3717 AC_REQUIRE([GCC_PROG_GNU_CXXFILT])
3719 # Turn a 'yes' into a suitable default.
3720 if test x$enable_symvers = xyes ; then
3721 if test $enable_shared = no || test "x$LD" = x || test x$gcc_no_link = xyes; then
3722 enable_symvers=no
3723 else
3724 if test $with_gnu_ld = yes ; then
3725 case ${target_os} in
3726 hpux*)
3727 enable_symvers=no ;;
3728 *)
3729 enable_symvers=gnu ;;
3730 esac
3731 else
3732 case ${target_os} in
3733 darwin*)
3734 enable_symvers=darwin ;;
3735 # Sun symbol versioning exists since Solaris 2.5.
3736 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
3737 # make_sunver.pl needs GNU c++filt to support extern "C++" in
3738 # version scripts, so disable symbol versioning if none can be
3739 # found.
3740 if test -z "$ac_cv_path_CXXFILT"; then
3741 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3742 AC_MSG_WARN([=== no GNU c++filt could be found.])
3743 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3744 enable_symvers=no
3745 else
3746 enable_symvers=sun
3747 fi
3748 ;;
3749 *)
3750 enable_symvers=no ;;
3751 esac
3752 fi
3753 fi
3754 fi
3756 # Check to see if 'darwin' or 'darwin-export' can win.
3757 if test x$enable_symvers = xdarwin-export ; then
3758 enable_symvers=darwin
3759 fi
3761 # Check if 'sun' was requested on non-Solaris 2 platforms.
3762 if test x$enable_symvers = xsun ; then
3763 case ${target_os} in
3764 solaris2*)
3765 # All fine.
3766 ;;
3767 *)
3768 # Unlikely to work.
3769 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3770 AC_MSG_WARN([=== you are not targetting Solaris 2.])
3771 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3772 enable_symvers=no
3773 ;;
3774 esac
3775 fi
3777 # Check to see if 'gnu' can win.
3778 if test $enable_symvers = gnu ||
3779 test $enable_symvers = gnu-versioned-namespace ||
3780 test $enable_symvers = sun; then
3781 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
3782 AC_MSG_CHECKING([for shared libgcc])
3783 ac_save_CFLAGS="$CFLAGS"
3784 CFLAGS=' -lgcc_s'
3785 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes, glibcxx_shared_libgcc=no)
3786 CFLAGS="$ac_save_CFLAGS"
3787 if test $glibcxx_shared_libgcc = no; then
3788 cat > conftest.c <<EOF
3789 int main (void) { return 0; }
3790 EOF
3791 changequote(,)dnl
3792 glibcxx_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
3793 -shared -shared-libgcc -o conftest.so \
3794 conftest.c -v 2>&1 >/dev/null \
3795 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
3796 changequote([,])dnl
3797 rm -f conftest.c conftest.so
3798 if test x${glibcxx_libgcc_s_suffix+set} = xset; then
3799 CFLAGS=" -lgcc_s$glibcxx_libgcc_s_suffix"
3800 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes)
3801 CFLAGS="$ac_save_CFLAGS"
3802 fi
3803 fi
3804 AC_MSG_RESULT($glibcxx_shared_libgcc)
3806 # For GNU ld, we need at least this version. The format is described in
3807 # GLIBCXX_CHECK_LINKER_FEATURES above.
3808 glibcxx_min_gnu_ld_version=21400
3810 # If no shared libgcc, can't win.
3811 if test $glibcxx_shared_libgcc != yes; then
3812 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3813 AC_MSG_WARN([=== you are not building a shared libgcc_s.])
3814 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3815 enable_symvers=no
3816 elif test $with_gnu_ld != yes && test $enable_symvers = sun; then
3817 : All interesting versions of Sun ld support sun style symbol versioning.
3818 elif test $with_gnu_ld != yes ; then
3819 # just fail for now
3820 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3821 AC_MSG_WARN([=== you are not using the GNU linker.])
3822 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3823 enable_symvers=no
3824 elif test $glibcxx_ld_is_gold = yes ; then
3825 : All versions of gold support symbol versioning.
3826 elif test $glibcxx_gnu_ld_version -lt $glibcxx_min_gnu_ld_version ; then
3827 # The right tools, the right setup, but too old. Fallbacks?
3828 AC_MSG_WARN(=== Linker version $glibcxx_gnu_ld_version is too old for)
3829 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
3830 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
3831 AC_MSG_WARN(=== $glibcxx_min_gnu_ld_version or later and rebuild GCC.)
3832 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3833 enable_symvers=no
3834 fi
3835 fi
3837 # For libtool versioning info, format is CURRENT:REVISION:AGE
3838 libtool_VERSION=6:28:0
3840 # Everything parsed; figure out what files and settings to use.
3841 case $enable_symvers in
3842 no)
3843 SYMVER_FILE=config/abi/pre/none.ver
3844 ;;
3845 gnu)
3846 SYMVER_FILE=config/abi/pre/gnu.ver
3847 AC_DEFINE(_GLIBCXX_SYMVER_GNU, 1,
3848 [Define to use GNU versioning in the shared library.])
3849 ;;
3850 gnu-versioned-namespace)
3851 libtool_VERSION=8:0:0
3852 SYMVER_FILE=config/abi/pre/gnu-versioned-namespace.ver
3853 AC_DEFINE(_GLIBCXX_SYMVER_GNU_NAMESPACE, 1,
3854 [Define to use GNU namespace versioning in the shared library.])
3855 ;;
3856 darwin)
3857 SYMVER_FILE=config/abi/pre/gnu.ver
3858 AC_DEFINE(_GLIBCXX_SYMVER_DARWIN, 1,
3859 [Define to use darwin versioning in the shared library.])
3860 ;;
3861 sun)
3862 SYMVER_FILE=config/abi/pre/gnu.ver
3863 AC_DEFINE(_GLIBCXX_SYMVER_SUN, 1,
3864 [Define to use Sun versioning in the shared library.])
3865 ;;
3866 esac
3868 if test x$enable_symvers != xno ; then
3869 AC_DEFINE(_GLIBCXX_SYMVER, 1,
3870 [Define to use symbol versioning in the shared library.])
3871 fi
3873 AC_CACHE_CHECK([whether the target supports .symver directive],
3874 glibcxx_cv_have_as_symver_directive, [
3875 AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
3876 [], glibcxx_cv_have_as_symver_directive=yes,
3877 glibcxx_cv_have_as_symver_directive=no)])
3878 if test $glibcxx_cv_have_as_symver_directive = yes; then
3879 AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
3880 [Define to 1 if the target assembler supports .symver directive.])
3881 fi
3883 AC_SUBST(SYMVER_FILE)
3884 AC_SUBST(port_specific_symbol_files)
3885 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS, test $enable_symvers != no)
3886 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU, test $enable_symvers = gnu)
3887 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU_NAMESPACE, test $enable_symvers = gnu-versioned-namespace)
3888 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_DARWIN, test $enable_symvers = darwin)
3889 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_SUN, test $enable_symvers = sun)
3890 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
3892 if test $enable_symvers != no ; then
3893 case ${target_os} in
3894 # The Solaris 2 runtime linker doesn't support the GNU extension of
3895 # binding the same symbol to different versions
3896 solaris2*)
3897 ;;
3898 # Other platforms with GNU symbol versioning (GNU/Linux, more?) do.
3899 *)
3900 AC_DEFINE(HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT, 1,
3901 [Define to 1 if the target runtime linker supports binding the same symbol to different versions.])
3902 ;;
3903 esac
3904 fi
3906 # Now, set up compatibility support, if any.
3907 # In addition, need this to deal with std::size_t mangling in
3908 # src/compatibility.cc. In a perfect world, could use
3909 # typeid(std::size_t).name()[0] to do direct substitution.
3910 AC_MSG_CHECKING([for size_t as unsigned int])
3911 ac_save_CFLAGS="$CFLAGS"
3912 CFLAGS="-Werror"
3913 AC_TRY_COMPILE(, [__SIZE_TYPE__* stp; unsigned int* uip; stp = uip;],
3914 [glibcxx_size_t_is_i=yes], [glibcxx_size_t_is_i=no])
3915 CFLAGS=$ac_save_CFLAGS
3916 if test "$glibcxx_size_t_is_i" = yes; then
3917 AC_DEFINE(_GLIBCXX_SIZE_T_IS_UINT, 1, [Define if size_t is unsigned int.])
3918 fi
3919 AC_MSG_RESULT([$glibcxx_size_t_is_i])
3921 AC_MSG_CHECKING([for ptrdiff_t as int])
3922 ac_save_CFLAGS="$CFLAGS"
3923 CFLAGS="-Werror"
3924 AC_TRY_COMPILE(, [__PTRDIFF_TYPE__* ptp; int* ip; ptp = ip;],
3925 [glibcxx_ptrdiff_t_is_i=yes], [glibcxx_ptrdiff_t_is_i=no])
3926 CFLAGS=$ac_save_CFLAGS
3927 if test "$glibcxx_ptrdiff_t_is_i" = yes; then
3928 AC_DEFINE(_GLIBCXX_PTRDIFF_T_IS_INT, 1, [Define if ptrdiff_t is int.])
3929 fi
3930 AC_MSG_RESULT([$glibcxx_ptrdiff_t_is_i])
3931 ])
3934 dnl
3935 dnl Setup to use the gcc gthr.h thread-specific memory and mutex model.
3936 dnl We must stage the required headers so that they will be installed
3937 dnl with the library (unlike libgcc, the STL implementation is provided
3938 dnl solely within headers). Since we must not inject random user-space
3939 dnl macro names into user-provided C++ code, we first stage into <file>-in
3940 dnl and process to <file> with an output command. The reason for a two-
3941 dnl stage process here is to correctly handle $srcdir!=$objdir without
3942 dnl having to write complex code (the sed commands to clean the macro
3943 dnl namespace are complex and fragile enough as it is). We must also
3944 dnl add a relative path so that -I- is supported properly.
3945 dnl
3946 dnl Substs:
3947 dnl thread_header
3948 dnl
3949 AC_DEFUN([GLIBCXX_ENABLE_THREADS], [
3950 AC_MSG_CHECKING([for thread model used by GCC])
3951 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3952 AC_MSG_RESULT([$target_thread_file])
3953 GCC_AC_THREAD_HEADER([$target_thread_file])
3954 ])
3957 dnl
3958 dnl Check if gthread implementation defines the types and functions
3959 dnl required by the c++0x thread library. Conforming gthread
3960 dnl implementations can define __GTHREADS_CXX0X to enable use with c++0x.
3961 dnl
3962 dnl GLIBCXX_ENABLE_SYMVERS must be done before this.
3963 dnl
3964 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
3965 GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
3967 if test x$enable_libstdcxx_threads = xauto ||
3968 test x$enable_libstdcxx_threads = xyes; then
3970 AC_LANG_SAVE
3971 AC_LANG_CPLUSPLUS
3973 ac_save_CXXFLAGS="$CXXFLAGS"
3974 CXXFLAGS="$CXXFLAGS -fno-exceptions \
3975 -I${toplevel_srcdir}/libgcc -I${toplevel_builddir}/libgcc"
3977 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3978 case $target_thread_file in
3979 posix)
3980 CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
3981 esac
3983 AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
3985 AC_TRY_COMPILE([#include <unistd.h>],
3986 [
3987 // In case of POSIX threads check _POSIX_TIMEOUTS.
3988 #if (defined(_PTHREADS) \
3989 && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
3990 #error
3991 #endif
3992 ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
3994 AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
3995 [Define to 1 if mutex_timedlock is available.])
3997 if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
3998 else res_mutex_timedlock=no ; fi
3999 AC_MSG_RESULT([$res_mutex_timedlock])
4001 AC_MSG_CHECKING([for gthreads library])
4003 AC_TRY_COMPILE([#include "gthr.h"],
4004 [
4005 #ifndef __GTHREADS_CXX0X
4006 #error
4007 #endif
4008 ], [ac_has_gthreads=yes], [ac_has_gthreads=no])
4009 else
4010 ac_has_gthreads=no
4011 fi
4013 AC_MSG_RESULT([$ac_has_gthreads])
4015 if test x"$ac_has_gthreads" = x"yes"; then
4016 AC_DEFINE(_GLIBCXX_HAS_GTHREADS, 1,
4017 [Define if gthreads library is available.])
4019 # Also check for pthread_rwlock_t for std::shared_timed_mutex in C++14
4020 AC_CHECK_TYPE([pthread_rwlock_t],
4021 [AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
4022 [Define if POSIX read/write locks are available in <gthr.h>.])],
4023 [],
4024 [#include "gthr.h"])
4025 fi
4027 CXXFLAGS="$ac_save_CXXFLAGS"
4028 AC_LANG_RESTORE
4029 ])
4032 # Check whether LC_MESSAGES is available in <locale.h>.
4033 # Ulrich Drepper <drepper@cygnus.com>, 1995.
4034 #
4035 # This file file be copied and used freely without restrictions. It can
4036 # be used in projects which are not available under the GNU Public License
4037 # but which still want to provide support for the GNU gettext functionality.
4038 # Please note that the actual code is *not* freely available.
4039 AC_DEFUN([AC_LC_MESSAGES], [
4040 AC_CHECK_HEADER(locale.h, [
4041 AC_CACHE_CHECK([for LC_MESSAGES], ac_cv_val_LC_MESSAGES,
4042 [AC_TRY_COMPILE([#include <locale.h>], [return LC_MESSAGES],
4043 ac_cv_val_LC_MESSAGES=yes, ac_cv_val_LC_MESSAGES=no)])
4044 if test $ac_cv_val_LC_MESSAGES = yes; then
4045 AC_DEFINE(HAVE_LC_MESSAGES, 1,
4046 [Define if LC_MESSAGES is available in <locale.h>.])
4047 fi
4048 ])
4049 ])
4051 dnl
4052 dnl Check whether rdrand is supported in the assembler.
4053 AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [
4054 AC_MSG_CHECKING([for rdrand support in assembler])
4055 AC_CACHE_VAL(ac_cv_x86_rdrand, [
4056 ac_cv_x86_rdrand=no
4057 case "$target" in
4058 i?86-*-* | \
4059 x86_64-*-*)
4060 AC_TRY_COMPILE(, [asm("rdrand %eax");],
4061 [ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no])
4062 esac
4063 ])
4064 if test $ac_cv_x86_rdrand = yes; then
4065 AC_DEFINE(_GLIBCXX_X86_RDRAND, 1,
4066 [ Defined if as can handle rdrand. ])
4067 fi
4068 AC_MSG_RESULT($ac_cv_x86_rdrand)
4069 ])
4071 dnl
4072 dnl Check whether rdseed is supported in the assembler.
4073 AC_DEFUN([GLIBCXX_CHECK_X86_RDSEED], [
4074 AC_MSG_CHECKING([for rdseed support in assembler])
4075 AC_CACHE_VAL(ac_cv_x86_rdseed, [
4076 ac_cv_x86_rdseed=no
4077 case "$target" in
4078 i?86-*-* | \
4079 x86_64-*-*)
4080 AC_TRY_COMPILE(, [asm("rdseed %eax");],
4081 [ac_cv_x86_rdseed=yes], [ac_cv_x86_rdseed=no])
4082 esac
4083 ])
4084 if test $ac_cv_x86_rdseed = yes; then
4085 AC_DEFINE(_GLIBCXX_X86_RDSEED, 1,
4086 [ Defined if as can handle rdseed. ])
4087 fi
4088 AC_MSG_RESULT($ac_cv_x86_rdseed)
4089 ])
4091 dnl
4092 dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS.
4093 dnl
4094 AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [
4096 AC_LANG_SAVE
4097 AC_LANG_CPLUSPLUS
4098 ac_save_CXXFLAGS="$CXXFLAGS"
4099 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4101 AC_MSG_CHECKING([for get_nprocs])
4102 AC_CACHE_VAL(glibcxx_cv_GET_NPROCS, [
4103 GCC_TRY_COMPILE_OR_LINK(
4104 [#include <sys/sysinfo.h>],
4105 [int n = get_nprocs();],
4106 [glibcxx_cv_GET_NPROCS=yes],
4107 [glibcxx_cv_GET_NPROCS=no])
4108 ])
4109 if test $glibcxx_cv_GET_NPROCS = yes; then
4110 AC_DEFINE(_GLIBCXX_USE_GET_NPROCS, 1, [Define if get_nprocs is available in <sys/sysinfo.h>.])
4111 fi
4112 AC_MSG_RESULT($glibcxx_cv_GET_NPROCS)
4114 CXXFLAGS="$ac_save_CXXFLAGS"
4115 AC_LANG_RESTORE
4116 ])
4118 dnl
4119 dnl Check whether sysconf(_SC_NPROCESSORS_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROCESSORS_ONLN.
4120 dnl
4121 AC_DEFUN([GLIBCXX_CHECK_SC_NPROCESSORS_ONLN], [
4123 AC_LANG_SAVE
4124 AC_LANG_CPLUSPLUS
4125 ac_save_CXXFLAGS="$CXXFLAGS"
4126 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4128 AC_MSG_CHECKING([for _SC_NPROCESSORS_ONLN])
4129 AC_CACHE_VAL(glibcxx_cv_SC_NPROCESSORS_ONLN, [
4130 GCC_TRY_COMPILE_OR_LINK(
4131 [#include <unistd.h>],
4132 [int n = sysconf(_SC_NPROCESSORS_ONLN);],
4133 [glibcxx_cv_SC_NPROCESSORS_ONLN=yes],
4134 [glibcxx_cv_SC_NPROCESSORS_ONLN=no])
4135 ])
4136 if test $glibcxx_cv_SC_NPROCESSORS_ONLN = yes; then
4137 AC_DEFINE(_GLIBCXX_USE_SC_NPROCESSORS_ONLN, 1, [Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>.])
4138 fi
4139 AC_MSG_RESULT($glibcxx_cv_SC_NPROCESSORS_ONLN)
4141 CXXFLAGS="$ac_save_CXXFLAGS"
4142 AC_LANG_RESTORE
4143 ])
4145 dnl
4146 dnl Check whether sysconf(_SC_NPROC_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROC_ONLN.
4147 dnl
4148 AC_DEFUN([GLIBCXX_CHECK_SC_NPROC_ONLN], [
4150 AC_LANG_SAVE
4151 AC_LANG_CPLUSPLUS
4152 ac_save_CXXFLAGS="$CXXFLAGS"
4153 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4155 AC_MSG_CHECKING([for _SC_NPROC_ONLN])
4156 AC_CACHE_VAL(glibcxx_cv_SC_NPROC_ONLN, [
4157 GCC_TRY_COMPILE_OR_LINK(
4158 [#include <unistd.h>],
4159 [int n = sysconf(_SC_NPROC_ONLN);],
4160 [glibcxx_cv_SC_NPROC_ONLN=yes],
4161 [glibcxx_cv_SC_NPROC_ONLN=no])
4162 ])
4163 if test $glibcxx_cv_SC_NPROC_ONLN = yes; then
4164 AC_DEFINE(_GLIBCXX_USE_SC_NPROC_ONLN, 1, [Define if _SC_NPROC_ONLN is available in <unistd.h>.])
4165 fi
4166 AC_MSG_RESULT($glibcxx_cv_SC_NPROC_ONLN)
4168 CXXFLAGS="$ac_save_CXXFLAGS"
4169 AC_LANG_RESTORE
4170 ])
4172 dnl
4173 dnl Check whether pthread_num_processors_np is available in <pthread.h>, and define _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP.
4174 dnl
4175 AC_DEFUN([GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP], [
4177 AC_LANG_SAVE
4178 AC_LANG_CPLUSPLUS
4179 ac_save_CXXFLAGS="$CXXFLAGS"
4180 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4182 AC_MSG_CHECKING([for pthreads_num_processors_np])
4183 AC_CACHE_VAL(glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP, [
4184 GCC_TRY_COMPILE_OR_LINK(
4185 [#include <pthread.h>],
4186 [int n = pthread_num_processors_np();],
4187 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=yes],
4188 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=no])
4189 ])
4190 if test $glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP = yes; then
4191 AC_DEFINE(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP, 1, [Define if pthreads_num_processors_np is available in <pthread.h>.])
4192 fi
4193 AC_MSG_RESULT($glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP)
4195 CXXFLAGS="$ac_save_CXXFLAGS"
4196 AC_LANG_RESTORE
4197 ])
4199 dnl
4200 dnl Check whether pthread_cond_clockwait is available in <pthread.h> for std::condition_variable to use,
4201 dnl and define _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT.
4202 dnl
4203 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT], [
4205 AC_LANG_SAVE
4206 AC_LANG_CPLUSPLUS
4207 ac_save_CXXFLAGS="$CXXFLAGS"
4208 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4209 ac_save_LIBS="$LIBS"
4210 LIBS="$LIBS -lpthread"
4212 AC_MSG_CHECKING([for pthread_cond_clockwait])
4213 AC_CACHE_VAL(glibcxx_cv_PTHREAD_COND_CLOCKWAIT, [
4214 GCC_TRY_COMPILE_OR_LINK(
4215 [#include <pthread.h>],
4216 [pthread_mutex_t mutex; pthread_cond_t cond; struct timespec ts; int n = pthread_cond_clockwait(&cond, &mutex, 0, &ts);],
4217 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=yes],
4218 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=no])
4219 ])
4220 if test $glibcxx_cv_PTHREAD_COND_CLOCKWAIT = yes; then
4221 AC_DEFINE(_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT, 1, [Define if pthread_cond_clockwait is available in <pthread.h>.])
4222 fi
4223 AC_MSG_RESULT($glibcxx_cv_PTHREAD_COND_CLOCKWAIT)
4225 CXXFLAGS="$ac_save_CXXFLAGS"
4226 LIBS="$ac_save_LIBS"
4227 AC_LANG_RESTORE
4228 ])
4230 dnl
4231 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4232 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4233 dnl
4234 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK], [
4236 AC_LANG_SAVE
4237 AC_LANG_CPLUSPLUS
4238 ac_save_CXXFLAGS="$CXXFLAGS"
4239 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4240 ac_save_LIBS="$LIBS"
4241 LIBS="$LIBS -lpthread"
4243 AC_MSG_CHECKING([for pthread_mutex_clocklock])
4244 AC_CACHE_VAL(glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK, [
4245 GCC_TRY_COMPILE_OR_LINK(
4246 [#include <pthread.h>],
4247 [pthread_mutex_t mutex; struct timespec ts; int n = pthread_mutex_clocklock(&mutex, CLOCK_REALTIME, &ts);],
4248 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=yes],
4249 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=no])
4250 ])
4251 if test $glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK = yes; then
4252 AC_DEFINE(_GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK, 1, [Define if pthread_mutex_clocklock is available in <pthread.h>.])
4253 fi
4254 AC_MSG_RESULT($glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK)
4256 CXXFLAGS="$ac_save_CXXFLAGS"
4257 LIBS="$ac_save_LIBS"
4258 AC_LANG_RESTORE
4259 ])
4261 dnl
4262 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4263 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4264 dnl
4265 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK], [
4267 AC_LANG_SAVE
4268 AC_LANG_CPLUSPLUS
4269 ac_save_CXXFLAGS="$CXXFLAGS"
4270 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4271 ac_save_LIBS="$LIBS"
4272 LIBS="$LIBS -lpthread"
4274 AC_MSG_CHECKING([for pthread_rwlock_clockrdlock, pthread_wlock_clockwrlock])
4275 AC_CACHE_VAL(glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK, [
4276 GCC_TRY_COMPILE_OR_LINK(
4277 [#include <pthread.h>],
4278 [pthread_rwlock_t rwl; struct timespec ts;]
4279 [int n = pthread_rwlock_clockrdlock(&rwl, CLOCK_REALTIME, &ts);]
4280 [int m = pthread_rwlock_clockwrlock(&rwl, CLOCK_REALTIME, &ts);],
4281 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=yes],
4282 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=no])
4283 ])
4284 if test $glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK = yes; then
4285 AC_DEFINE(_GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK, 1, [Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are available in <pthread.h>.])
4286 fi
4287 AC_MSG_RESULT($glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK)
4289 CXXFLAGS="$ac_save_CXXFLAGS"
4290 LIBS="$ac_save_LIBS"
4291 AC_LANG_RESTORE
4292 ])
4294 dnl
4295 dnl Check whether sysctl is available in <pthread.h>, and define _GLIBCXX_USE_SYSCTL_HW_NCPU.
4296 dnl
4297 AC_DEFUN([GLIBCXX_CHECK_SYSCTL_HW_NCPU], [
4299 AC_LANG_SAVE
4300 AC_LANG_CPLUSPLUS
4301 ac_save_CXXFLAGS="$CXXFLAGS"
4302 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4304 AC_MSG_CHECKING([for hw.ncpu sysctl])
4305 AC_CACHE_VAL(glibcxx_cv_SYSCTL_HW_NCPU, [
4306 GCC_TRY_COMPILE_OR_LINK(
4307 [
4308 #include <stddef.h>
4309 #include <sys/sysctl.h>
4310 ],
4311 [
4312 int count;
4313 size_t size = sizeof(count);
4314 int mib[] = { CTL_HW, HW_NCPU };
4315 sysctl(mib, 2, &count, &size, NULL, 0);
4316 ],
4317 [glibcxx_cv_SYSCTL_HW_NCPU=yes],
4318 [glibcxx_cv_SYSCTL_HW_NCPU=no])
4319 ])
4320 if test $glibcxx_cv_SYSCTL_HW_NCPU = yes; then
4321 AC_DEFINE(_GLIBCXX_USE_SYSCTL_HW_NCPU, 1, [Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>.])
4322 fi
4323 AC_MSG_RESULT($glibcxx_cv_SYSCTL_HW_NCPU)
4325 CXXFLAGS="$ac_save_CXXFLAGS"
4326 AC_LANG_RESTORE
4327 ])
4329 dnl
4330 dnl Check to see if python pretty printing can be activated.
4331 dnl
4332 dnl --with-python-dir=dir
4333 dnl installs directory into $prefix/dir
4334 AC_DEFUN([GLIBCXX_ENABLE_PYTHON], [
4336 AC_MSG_CHECKING([for custom python install directory])
4337 AC_ARG_WITH([python-dir],
4338 AS_HELP_STRING([--with-python-dir],
4339 [the location to install Python modules. This path is relative starting from the prefix.]),
4340 [with_python_dir=$withval], [with_python_dir="no"])
4341 AC_MSG_RESULT(${with_python_dir})
4343 # Needed for installing Python modules during make install.
4344 python_mod_dir="${with_python_dir}"
4345 AC_SUBST(python_mod_dir)
4346 GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
4347 ])
4349 dnl
4350 dnl Check to see if -Werror is disabled.
4351 dnl
4352 dnl --enable-werror/--disable-werror
4353 AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
4354 AC_MSG_CHECKING([for -Werror])
4355 GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
4356 AC_MSG_RESULT($enable_werror)
4357 GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
4358 ])
4360 dnl
4361 dnl Check whether obsolescent tmpnam is available in <stdio.h>,
4362 dnl and define _GLIBCXX_USE_TMPNAM.
4363 dnl
4364 AC_DEFUN([GLIBCXX_CHECK_TMPNAM], [dnl
4365 dnl
4366 AC_LANG_SAVE
4367 AC_LANG_CPLUSPLUS
4368 ac_save_CXXFLAGS="$CXXFLAGS"
4369 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4370 dnl
4371 AC_MSG_CHECKING([for tmpnam])
4372 AC_CACHE_VAL(glibcxx_cv_TMPNAM, [dnl
4373 GCC_TRY_COMPILE_OR_LINK(
4374 [#include <stdio.h>],
4375 [char *tmp = tmpnam(NULL);],
4376 [glibcxx_cv_TMPNAM=yes],
4377 [glibcxx_cv_TMPNAM=no])
4378 ])
4379 if test $glibcxx_cv_TMPNAM = yes; then
4380 AC_DEFINE(_GLIBCXX_USE_TMPNAM, 1, [Define if obsolescent tmpnam is available in <stdio.h>.])
4381 fi
4382 AC_MSG_RESULT($glibcxx_cv_TMPNAM)
4383 dnl
4384 CXXFLAGS="$ac_save_CXXFLAGS"
4385 AC_LANG_RESTORE
4386 ])
4388 dnl
4389 dnl Check to see if sys/sdt.h exists and that it is suitable for use.
4390 dnl Some versions of sdt.h were not compatible with C++11.
4391 dnl
4392 AC_DEFUN([GLIBCXX_CHECK_SDT_H], [
4393 AC_MSG_CHECKING([for suitable sys/sdt.h])
4394 # Note that this test has to be run with the C language.
4395 # Otherwise, sdt.h will try to include some headers from
4396 # libstdc++ itself.
4397 AC_LANG_SAVE
4398 AC_LANG_C
4399 AC_CACHE_VAL(glibcxx_cv_sys_sdt_h, [
4400 # Because we have to run the test in C, we use grep rather
4401 # than the compiler to check for the bug. The bug is that
4402 # were strings without trailing whitespace, causing g++
4403 # to look for operator"". The pattern searches for the fixed
4404 # output.
4405 AC_EGREP_CPP([ \",\" ], [
4406 #include <sys/sdt.h>
4407 int f() { STAP_PROBE(hi, bob); }
4408 ], [glibcxx_cv_sys_sdt_h=yes], [glibcxx_cv_sys_sdt_h=no])
4409 ])
4410 AC_LANG_RESTORE
4411 if test $glibcxx_cv_sys_sdt_h = yes; then
4412 AC_DEFINE(HAVE_SYS_SDT_H, 1,
4413 [Define to 1 if you have a suitable <sys/sdt.h> header file])
4414 fi
4415 AC_MSG_RESULT($glibcxx_cv_sys_sdt_h)
4416 ])
4418 dnl
4419 dnl Control whether the library should define symbols for old and new ABIs.
4420 dnl This affects definitions of strings, stringstreams and locale facets.
4421 dnl
4422 dnl --disable-libstdcxx-dual-abi will use old ABI for all types.
4423 dnl
4424 dnl Defines:
4425 dnl _GLIBCXX_USE_DUAL_ABI (always defined, either to 1 or 0)
4426 dnl
4427 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_DUAL_ABI], [
4428 GLIBCXX_ENABLE(libstdcxx-dual-abi,$1,,[support two versions of std::string])
4429 if test x$enable_symvers = xgnu-versioned-namespace; then
4430 # gnu-versioned-namespace is incompatible with the dual ABI.
4431 enable_libstdcxx_dual_abi="no"
4432 fi
4433 if test x"$enable_libstdcxx_dual_abi" != xyes; then
4434 AC_MSG_NOTICE([dual ABI is disabled])
4435 default_libstdcxx_abi="gcc4-compatible"
4436 fi
4437 GLIBCXX_CONDITIONAL(ENABLE_DUAL_ABI, test $enable_libstdcxx_dual_abi = yes)
4438 ])
4440 dnl
4441 dnl Check to see which ABI should be enabled by default.
4442 dnl
4443 dnl --with-default-libstdcxx-abi={gcc4-compatible,new}
4444 dnl
4445 dnl Defines:
4446 dnl _GLIBCXX_USE_CXX11_ABI (always defined, either to 1 or 0)
4447 dnl
4448 AC_DEFUN([GLIBCXX_DEFAULT_ABI], [
4449 if test x$enable_libstdcxx_dual_abi = xyes; then
4450 AC_MSG_CHECKING([for default std::string ABI to use])
4451 AC_ARG_WITH([default-libstdcxx-abi],
4452 AS_HELP_STRING([--with-default-libstdcxx-abi],
4453 [set the std::string ABI to use by default]),
4454 [case "$withval" in
4455 gcc4-compatible) default_libstdcxx_abi="gcc4-compatible" ;;
4456 new|cxx11) default_libstdcxx_abi="new" ;;
4457 c++*|gnu++*) AC_MSG_ERROR([Supported arguments for --with-default-libstdcxx-abi have changed, use "new" or "gcc4-compatible"]) ;;
4458 *) AC_MSG_ERROR([Invalid argument for --with-default-libstdcxx-abi]) ;;
4459 esac
4460 ],
4461 [default_libstdcxx_abi="new"])
4462 AC_MSG_RESULT(${default_libstdcxx_abi})
4463 fi
4464 if test $default_libstdcxx_abi = "new"; then
4465 glibcxx_cxx11_abi=1
4466 glibcxx_cxx98_abi=0
4467 else
4468 glibcxx_cxx11_abi=0
4469 glibcxx_cxx98_abi=1
4470 fi
4471 AC_SUBST(glibcxx_cxx98_abi)
4472 GLIBCXX_CONDITIONAL(ENABLE_CXX11_ABI, test $glibcxx_cxx11_abi = 1)
4473 ])
4475 dnl
4476 dnl Check to see whether to build libstdc++fs.a
4477 dnl
4478 dnl --enable-libstdcxx-filesystem-ts
4479 dnl
4480 AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
4481 GLIBCXX_ENABLE(libstdcxx-filesystem-ts,auto,,
4482 [turns on ISO/IEC TS 18822 support],
4483 [permit yes|no|auto])
4485 AC_MSG_CHECKING([whether to build Filesystem TS support])
4486 if test x"$ac_cv_header_dirent_h" != x"yes"; then
4487 enable_libstdcxx_filesystem_ts=no
4488 fi
4489 if test x"$enable_libstdcxx_filesystem_ts" = x"auto"; then
4490 case "${target_os}" in
4491 freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
4492 enable_libstdcxx_filesystem_ts=yes
4493 ;;
4494 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
4495 enable_libstdcxx_filesystem_ts=yes
4496 ;;
4497 rtems*)
4498 enable_libstdcxx_filesystem_ts=yes
4499 ;;
4500 solaris*)
4501 enable_libstdcxx_filesystem_ts=yes
4502 ;;
4503 mingw*)
4504 enable_libstdcxx_filesystem_ts=yes
4505 ;;
4506 *)
4507 enable_libstdcxx_filesystem_ts=no
4508 ;;
4509 esac
4510 fi
4511 AC_MSG_RESULT($enable_libstdcxx_filesystem_ts)
4512 GLIBCXX_CONDITIONAL(ENABLE_FILESYSTEM_TS, test $enable_libstdcxx_filesystem_ts = yes)
4513 ])
4515 dnl
4516 dnl Check whether the library calls required by the Filesystem TS are present.
4517 dnl Defines:
4518 dnl HAVE_STRUCT_DIRENT_D_TYPE
4519 dnl _GLIBCXX_USE_REALPATH
4520 dnl _GLIBCXX_USE_UTIMENSAT
4521 dnl _GLIBCXX_USE_ST_MTIM
4522 dnl _GLIBCXX_USE_FCHMOD
4523 dnl _GLIBCXX_USE_FCHMODAT
4524 dnl _GLIBCXX_USE_SENDFILE
4525 dnl HAVE_LINK
4526 dnl HAVE_READLINK
4527 dnl HAVE_SYMLINK
4528 dnl
4529 AC_DEFUN([GLIBCXX_CHECK_FILESYSTEM_DEPS], [dnl
4530 dnl
4531 if test $enable_libstdcxx_filesystem_ts = yes; then
4532 AC_LANG_SAVE
4533 AC_LANG_CPLUSPLUS
4534 ac_save_CXXFLAGS="$CXXFLAGS"
4535 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4536 dnl
4537 AC_MSG_CHECKING([for struct dirent.d_type])
4538 AC_CACHE_VAL(glibcxx_cv_dirent_d_type, [dnl
4539 GCC_TRY_COMPILE_OR_LINK(
4540 [#include <dirent.h>],
4541 [
4542 struct dirent d;
4543 if (sizeof d.d_type) return 0;
4544 ],
4545 [glibcxx_cv_dirent_d_type=yes],
4546 [glibcxx_cv_dirent_d_type=no])
4547 ])
4548 if test $glibcxx_cv_dirent_d_type = yes; then
4549 AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE, 1, [Define to 1 if `d_type' is a member of `struct dirent'.])
4550 fi
4551 AC_MSG_RESULT($glibcxx_cv_dirent_d_type)
4552 dnl
4553 AC_MSG_CHECKING([for realpath])
4554 AC_CACHE_VAL(glibcxx_cv_realpath, [dnl
4555 GCC_TRY_COMPILE_OR_LINK(
4556 [
4557 #include <limits.h>
4558 #include <stdlib.h>
4559 #include <unistd.h>
4560 ],
4561 [
4562 #if _XOPEN_VERSION < 500
4563 #error
4564 #elif _XOPEN_VERSION >= 700 || defined(PATH_MAX)
4565 char *tmp = realpath((const char*)NULL, (char*)NULL);
4566 #else
4567 #error
4568 #endif
4569 ],
4570 [glibcxx_cv_realpath=yes],
4571 [glibcxx_cv_realpath=no])
4572 ])
4573 if test $glibcxx_cv_realpath = yes; then
4574 AC_DEFINE(_GLIBCXX_USE_REALPATH, 1, [Define if usable realpath is available in <stdlib.h>.])
4575 fi
4576 AC_MSG_RESULT($glibcxx_cv_realpath)
4577 dnl
4578 AC_MSG_CHECKING([for utimensat])
4579 AC_CACHE_VAL(glibcxx_cv_utimensat, [dnl
4580 GCC_TRY_COMPILE_OR_LINK(
4581 [
4582 #include <fcntl.h>
4583 #include <sys/stat.h>
4584 ],
4585 [
4586 struct timespec ts[2] = { { 0, UTIME_OMIT }, { 1, 1 } };
4587 int i = utimensat(AT_FDCWD, "path", ts, 0);
4588 ],
4589 [glibcxx_cv_utimensat=yes],
4590 [glibcxx_cv_utimensat=no])
4591 ])
4592 if test $glibcxx_cv_utimensat = yes; then
4593 AC_DEFINE(_GLIBCXX_USE_UTIMENSAT, 1, [Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and AT_FDCWD in <fcntl.h>.])
4594 fi
4595 AC_MSG_RESULT($glibcxx_cv_utimensat)
4596 dnl
4597 AC_MSG_CHECKING([for utime])
4598 AC_CACHE_VAL(glibcxx_cv_utime, [dnl
4599 GCC_TRY_COMPILE_OR_LINK(
4600 [
4601 #include <utime.h>
4602 ],
4603 [
4604 struct utimbuf t = { 1, 1 };
4605 int i = utime("path", &t);
4606 ],
4607 [glibcxx_cv_utime=yes],
4608 [glibcxx_cv_utime=no])
4609 ])
4610 if test $glibcxx_cv_utime = yes; then
4611 AC_DEFINE(_GLIBCXX_USE_UTIME, 1, [Define if utime is available in <utime.h>.])
4612 fi
4613 AC_MSG_RESULT($glibcxx_cv_utime)
4614 dnl
4615 AC_MSG_CHECKING([for lstat])
4616 AC_CACHE_VAL(glibcxx_cv_lstat, [dnl
4617 GCC_TRY_COMPILE_OR_LINK(
4618 [ #include <sys/stat.h> ],
4619 [
4620 struct stat st;
4621 int i = lstat("path", &st);
4622 ],
4623 [glibcxx_cv_lstat=yes],
4624 [glibcxx_cv_lstat=no])
4625 ])
4626 if test $glibcxx_cv_lstat = yes; then
4627 AC_DEFINE(_GLIBCXX_USE_LSTAT, 1, [Define if lstat is available in <sys/stat.h>.])
4628 fi
4629 AC_MSG_RESULT($glibcxx_cv_lstat)
4630 dnl
4631 AC_MSG_CHECKING([for struct stat.st_mtim.tv_nsec])
4632 AC_CACHE_VAL(glibcxx_cv_st_mtim, [dnl
4633 GCC_TRY_COMPILE_OR_LINK(
4634 [ #include <sys/stat.h> ],
4635 [
4636 struct stat st;
4637 return st.st_mtim.tv_nsec;
4638 ],
4639 [glibcxx_cv_st_mtim=yes],
4640 [glibcxx_cv_st_mtim=no])
4641 ])
4642 if test $glibcxx_cv_st_mtim = yes; then
4643 AC_DEFINE(_GLIBCXX_USE_ST_MTIM, 1, [Define if struct stat has timespec members.])
4644 fi
4645 AC_MSG_RESULT($glibcxx_cv_st_mtim)
4646 dnl
4647 AC_MSG_CHECKING([for fchmod])
4648 AC_CACHE_VAL(glibcxx_cv_fchmod, [dnl
4649 GCC_TRY_COMPILE_OR_LINK(
4650 [#include <sys/stat.h>],
4651 [fchmod(1, S_IWUSR);],
4652 [glibcxx_cv_fchmod=yes],
4653 [glibcxx_cv_fchmod=no])
4654 ])
4655 if test $glibcxx_cv_fchmod = yes; then
4656 AC_DEFINE(_GLIBCXX_USE_FCHMOD, 1, [Define if fchmod is available in <sys/stat.h>.])
4657 fi
4658 AC_MSG_RESULT($glibcxx_cv_fchmod)
4659 dnl
4660 AC_MSG_CHECKING([for fchmodat])
4661 AC_CACHE_VAL(glibcxx_cv_fchmodat, [dnl
4662 GCC_TRY_COMPILE_OR_LINK(
4663 [
4664 #include <fcntl.h>
4665 #include <sys/stat.h>
4666 ],
4667 [fchmodat(AT_FDCWD, "", 0, AT_SYMLINK_NOFOLLOW);],
4668 [glibcxx_cv_fchmodat=yes],
4669 [glibcxx_cv_fchmodat=no])
4670 ])
4671 if test $glibcxx_cv_fchmodat = yes; then
4672 AC_DEFINE(_GLIBCXX_USE_FCHMODAT, 1, [Define if fchmodat is available in <sys/stat.h>.])
4673 fi
4674 AC_MSG_RESULT($glibcxx_cv_fchmodat)
4675 dnl
4676 AC_MSG_CHECKING([for sendfile that can copy files])
4677 AC_CACHE_VAL(glibcxx_cv_sendfile, [dnl
4678 case "${target_os}" in
4679 gnu* | linux* | solaris* | uclinux*)
4680 GCC_TRY_COMPILE_OR_LINK(
4681 [#include <sys/sendfile.h>],
4682 [sendfile(1, 2, (off_t*)0, sizeof 1);],
4683 [glibcxx_cv_sendfile=yes],
4684 [glibcxx_cv_sendfile=no])
4685 ;;
4686 *)
4687 glibcxx_cv_sendfile=no
4688 ;;
4689 esac
4690 ])
4691 if test $glibcxx_cv_sendfile = yes; then
4692 AC_DEFINE(_GLIBCXX_USE_SENDFILE, 1, [Define if sendfile is available in <sys/sendfile.h>.])
4693 fi
4694 AC_MSG_RESULT($glibcxx_cv_sendfile)
4695 dnl
4696 AC_MSG_CHECKING([for link])
4697 AC_CACHE_VAL(glibcxx_cv_link, [dnl
4698 GCC_TRY_COMPILE_OR_LINK(
4699 [#include <unistd.h>],
4700 [link("", "");],
4701 [glibcxx_cv_link=yes],
4702 [glibcxx_cv_link=no])
4703 ])
4704 if test $glibcxx_cv_link = yes; then
4705 AC_DEFINE(HAVE_LINK, 1, [Define if link is available in <unistd.h>.])
4706 fi
4707 AC_MSG_RESULT($glibcxx_cv_link)
4708 dnl
4709 AC_MSG_CHECKING([for readlink])
4710 AC_CACHE_VAL(glibcxx_cv_readlink, [dnl
4711 GCC_TRY_COMPILE_OR_LINK(
4712 [#include <unistd.h>],
4713 [char buf[32]; readlink("", buf, sizeof(buf));],
4714 [glibcxx_cv_readlink=yes],
4715 [glibcxx_cv_readlink=no])
4716 ])
4717 if test $glibcxx_cv_readlink = yes; then
4718 AC_DEFINE(HAVE_READLINK, 1, [Define if readlink is available in <unistd.h>.])
4719 fi
4720 AC_MSG_RESULT($glibcxx_cv_readlink)
4721 dnl
4722 AC_MSG_CHECKING([for symlink])
4723 AC_CACHE_VAL(glibcxx_cv_symlink, [dnl
4724 GCC_TRY_COMPILE_OR_LINK(
4725 [#include <unistd.h>],
4726 [symlink("", "");],
4727 [glibcxx_cv_symlink=yes],
4728 [glibcxx_cv_symlink=no])
4729 ])
4730 if test $glibcxx_cv_symlink = yes; then
4731 AC_DEFINE(HAVE_SYMLINK, 1, [Define if symlink is available in <unistd.h>.])
4732 fi
4733 AC_MSG_RESULT($glibcxx_cv_symlink)
4734 dnl
4735 AC_MSG_CHECKING([for truncate])
4736 AC_CACHE_VAL(glibcxx_cv_truncate, [dnl
4737 GCC_TRY_COMPILE_OR_LINK(
4738 [#include <unistd.h>],
4739 [truncate("", 99);],
4740 [glibcxx_cv_truncate=yes],
4741 [glibcxx_cv_truncate=no])
4742 ])
4743 if test $glibcxx_cv_truncate = yes; then
4744 AC_DEFINE(HAVE_TRUNCATE, 1, [Define if truncate is available in <unistd.h>.])
4745 fi
4746 AC_MSG_RESULT($glibcxx_cv_truncate)
4747 dnl
4748 CXXFLAGS="$ac_save_CXXFLAGS"
4749 AC_LANG_RESTORE
4750 fi
4751 ])
4753 dnl
4754 dnl Check how size_t is mangled. Copied from libitm.
4755 dnl
4756 AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
4757 AC_CACHE_CHECK([how size_t is mangled],
4758 glibcxx_cv_size_t_mangling, [
4759 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
4760 [glibcxx_cv_size_t_mangling=m], [
4761 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
4762 [glibcxx_cv_size_t_mangling=j], [
4763 AC_TRY_COMPILE([],
4764 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
4765 [glibcxx_cv_size_t_mangling=y], [
4766 AC_TRY_COMPILE([],
4767 [extern __SIZE_TYPE__ x; extern unsigned short x;],
4768 [glibcxx_cv_size_t_mangling=t], [
4769 AC_TRY_COMPILE([],
4770 [extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
4771 [glibcxx_cv_size_t_mangling=u6uint20],
4772 [glibcxx_cv_size_t_mangling=x])
4773 ])
4774 ])
4775 ])
4776 ])
4777 ])
4778 if test $glibcxx_cv_size_t_mangling = x; then
4779 AC_MSG_ERROR([Unknown underlying type for size_t])
4780 fi
4781 AC_DEFINE_UNQUOTED(_GLIBCXX_MANGLE_SIZE_T, [$glibcxx_cv_size_t_mangling],
4782 [Define to the letter to which size_t is mangled.])
4783 ])
4785 dnl
4786 dnl Determine whether std::exception_ptr symbols should be exported with
4787 dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
4788 dnl release first added support for std::exception_ptr. Originally it was
4789 dnl only supported for targets with always-lock-free atomics for int, but
4790 dnl since GCC 7.1 it is supported for all targets.
4791 dnl
4792 AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
4793 if test $enable_symvers != no; then
4794 AC_MSG_CHECKING([for first version to support std::exception_ptr])
4795 case ${target} in
4796 aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
4797 m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
4798 ac_exception_ptr_since_gcc46=yes
4799 ;;
4800 *)
4801 # If the value of this macro changes then we will need to hardcode
4802 # yes/no here for additional targets based on the original value.
4803 AC_TRY_COMPILE([], [
4804 #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
4805 # error atomic int not always lock free
4806 #endif
4807 ],
4808 [ac_exception_ptr_since_gcc46=yes],
4809 [ac_exception_ptr_since_gcc46=no])
4810 ;;
4811 esac
4812 if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
4813 AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
4814 [Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
4815 AC_MSG_RESULT([4.6.0])
4816 else
4817 AC_MSG_RESULT([7.1.0])
4818 fi
4819 fi
4820 ])
4822 # Macros from the top-level gcc directory.
4823 m4_include([../config/gc++filt.m4])
4824 m4_include([../config/tls.m4])
4825 m4_include([../config/gthr.m4])
4826 m4_include([../config/cet.m4])