| blob | 84258d87a337ba9c802c845b8fac9c1e1da8e71b |
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/GNU gold /GNU ld /;s/GNU ld version /GNU ld /;s/GNU ld ([^)]*) /GNU ld /;s/GNU ld \([0-9.][0-9.]*\).*/\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 esac
1446 elif test x"$enable_libstdcxx_time" != x"no"; then
1448 if test x"$enable_libstdcxx_time" = x"rt"; then
1449 AC_SEARCH_LIBS(clock_gettime, [rt posix4])
1450 AC_SEARCH_LIBS(nanosleep, [rt posix4])
1451 else
1452 AC_SEARCH_LIBS(clock_gettime, [posix4])
1453 AC_SEARCH_LIBS(nanosleep, [posix4])
1454 fi
1456 case "$ac_cv_search_clock_gettime" in
1457 -l*) GLIBCXX_LIBS=$ac_cv_search_clock_gettime
1458 ;;
1459 esac
1460 case "$ac_cv_search_nanosleep" in
1461 -l*) GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_nanosleep"
1462 ;;
1463 esac
1465 AC_SEARCH_LIBS(sched_yield, [rt posix4])
1467 case "$ac_cv_search_sched_yield" in
1468 -lposix4*)
1469 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1470 ac_has_sched_yield=yes
1471 ;;
1472 -lrt*)
1473 if test x"$enable_libstdcxx_time" = x"rt"; then
1474 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1475 ac_has_sched_yield=yes
1476 fi
1477 ;;
1478 *)
1479 ac_has_sched_yield=yes
1480 ;;
1481 esac
1483 AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
1485 if test x"$ac_has_unistd_h" = x"yes"; then
1486 AC_MSG_CHECKING([for monotonic clock])
1487 AC_TRY_LINK(
1488 [#include <unistd.h>
1489 #include <time.h>
1490 ],
1491 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1492 timespec tp;
1493 #endif
1494 clock_gettime(CLOCK_MONOTONIC, &tp);
1495 ], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
1497 AC_MSG_RESULT($ac_has_clock_monotonic)
1499 AC_MSG_CHECKING([for realtime clock])
1500 AC_TRY_LINK(
1501 [#include <unistd.h>
1502 #include <time.h>
1503 ],
1504 [#if _POSIX_TIMERS > 0
1505 timespec tp;
1506 #endif
1507 clock_gettime(CLOCK_REALTIME, &tp);
1508 ], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
1510 AC_MSG_RESULT($ac_has_clock_realtime)
1512 AC_MSG_CHECKING([for nanosleep])
1513 AC_TRY_LINK(
1514 [#include <unistd.h>
1515 #include <time.h>
1516 ],
1517 [#if _POSIX_TIMERS > 0
1518 timespec tp;
1519 #endif
1520 nanosleep(&tp, 0);
1521 ], [ac_has_nanosleep=yes], [ac_has_nanosleep=no])
1523 AC_MSG_RESULT($ac_has_nanosleep)
1524 fi
1525 fi
1527 if test x"$ac_has_clock_monotonic" != x"yes"; then
1528 case ${target_os} in
1529 linux*)
1530 AC_MSG_CHECKING([for clock_gettime syscall])
1531 AC_TRY_COMPILE(
1532 [#include <unistd.h>
1533 #include <time.h>
1534 #include <sys/syscall.h>
1535 ],
1536 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1537 timespec tp;
1538 #endif
1539 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp);
1540 syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);
1541 ], [ac_has_clock_monotonic_syscall=yes], [ac_has_clock_monotonic_syscall=no])
1542 AC_MSG_RESULT($ac_has_clock_monotonic_syscall)
1543 if test x"$ac_has_clock_monotonic_syscall" = x"yes"; then
1544 AC_DEFINE(_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL, 1,
1545 [ Defined if clock_gettime syscall has monotonic and realtime clock support. ])
1546 ac_has_clock_monotonic=yes
1547 ac_has_clock_realtime=yes
1548 fi;;
1549 esac
1550 fi
1552 if test x"$ac_has_clock_monotonic" = x"yes"; then
1553 AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
1554 [ Defined if clock_gettime has monotonic clock support. ])
1555 fi
1557 if test x"$ac_has_clock_realtime" = x"yes"; then
1558 AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
1559 [ Defined if clock_gettime has realtime clock support. ])
1560 fi
1562 if test x"$ac_has_sched_yield" = x"yes"; then
1563 AC_DEFINE(_GLIBCXX_USE_SCHED_YIELD, 1,
1564 [ Defined if sched_yield is available. ])
1565 fi
1567 if test x"$ac_has_nanosleep" = x"yes"; then
1568 AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
1569 [ Defined if nanosleep is available. ])
1570 else
1571 AC_MSG_CHECKING([for sleep])
1572 AC_TRY_COMPILE([#include <unistd.h>],
1573 [sleep(1)],
1574 [ac_has_sleep=yes],[ac_has_sleep=no])
1575 if test x"$ac_has_sleep" = x"yes"; then
1576 AC_DEFINE(HAVE_SLEEP,1, [Defined if sleep exists.])
1577 fi
1578 AC_MSG_RESULT($ac_has_sleep)
1579 AC_MSG_CHECKING([for usleep])
1580 AC_TRY_COMPILE([#include <unistd.h>],
1581 [sleep(1);
1582 usleep(100);],
1583 [ac_has_usleep=yes],[ac_has_usleep=no])
1584 if test x"$ac_has_usleep" = x"yes"; then
1585 AC_DEFINE(HAVE_USLEEP,1, [Defined if usleep exists.])
1586 fi
1587 AC_MSG_RESULT($ac_has_usleep)
1588 fi
1590 if test x"$ac_has_nanosleep$ac_has_sleep" = x"nono"; then
1591 AC_MSG_CHECKING([for Sleep])
1592 AC_TRY_COMPILE([#include <windows.h>],
1593 [Sleep(1)],
1594 [ac_has_win32_sleep=yes],[ac_has_win32_sleep=no])
1595 if test x"$ac_has_win32_sleep" = x"yes"; then
1596 AC_DEFINE(HAVE_WIN32_SLEEP,1, [Defined if Sleep exists.])
1597 fi
1598 AC_MSG_RESULT($ac_has_win32_sleep)
1599 fi
1601 AC_SUBST(GLIBCXX_LIBS)
1603 CXXFLAGS="$ac_save_CXXFLAGS"
1604 LIBS="$ac_save_LIBS"
1605 AC_LANG_RESTORE
1606 ])
1608 dnl
1609 dnl Check for gettimeofday, used in the implementation of 20.11.7
1610 dnl [time.clock] in the C++11 standard.
1611 dnl
1612 AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
1614 AC_MSG_CHECKING([for gettimeofday])
1616 AC_LANG_SAVE
1617 AC_LANG_CPLUSPLUS
1618 ac_save_CXXFLAGS="$CXXFLAGS"
1619 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1621 ac_has_gettimeofday=no;
1622 AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
1623 if test x"$ac_has_sys_time_h" = x"yes"; then
1624 AC_MSG_CHECKING([for gettimeofday])
1625 GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
1626 [timeval tv; gettimeofday(&tv, 0);],
1627 [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
1629 AC_MSG_RESULT($ac_has_gettimeofday)
1630 fi
1632 if test x"$ac_has_gettimeofday" = x"yes"; then
1633 AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
1634 [ Defined if gettimeofday is available. ])
1635 fi
1637 CXXFLAGS="$ac_save_CXXFLAGS"
1638 AC_LANG_RESTORE
1639 ])
1641 dnl
1642 dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
1643 dnl facilities in Chapter 8, "C compatibility".
1644 dnl
1645 AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
1647 AC_LANG_SAVE
1648 AC_LANG_CPLUSPLUS
1650 # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
1651 # undefined and fake C99 facilities may be spuriously enabled.
1652 ac_save_CXXFLAGS="$CXXFLAGS"
1653 CXXFLAGS="$CXXFLAGS -std=c++98"
1655 # Check for the existence of <complex.h> complex math functions used
1656 # by tr1/complex.
1657 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1658 ac_c99_complex_tr1=no;
1659 if test x"$ac_has_complex_h" = x"yes"; then
1660 AC_MSG_CHECKING([for ISO C99 support to TR1 in <complex.h>])
1661 AC_TRY_COMPILE([#include <complex.h>],
1662 [typedef __complex__ float float_type; float_type tmpf;
1663 cacosf(tmpf);
1664 casinf(tmpf);
1665 catanf(tmpf);
1666 cacoshf(tmpf);
1667 casinhf(tmpf);
1668 catanhf(tmpf);
1669 typedef __complex__ double double_type; double_type tmpd;
1670 cacos(tmpd);
1671 casin(tmpd);
1672 catan(tmpd);
1673 cacosh(tmpd);
1674 casinh(tmpd);
1675 catanh(tmpd);
1676 typedef __complex__ long double ld_type; ld_type tmpld;
1677 cacosl(tmpld);
1678 casinl(tmpld);
1679 catanl(tmpld);
1680 cacoshl(tmpld);
1681 casinhl(tmpld);
1682 catanhl(tmpld);
1683 ],[ac_c99_complex_tr1=yes], [ac_c99_complex_tr1=no])
1684 fi
1685 AC_MSG_RESULT($ac_c99_complex_tr1)
1686 if test x"$ac_c99_complex_tr1" = x"yes"; then
1687 AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_TR1, 1,
1688 [Define if C99 functions in <complex.h> should be used in
1689 <tr1/complex>. Using compiler builtins for these functions
1690 requires corresponding C99 library functions to be present.])
1691 fi
1693 # Check for the existence of <ctype.h> functions.
1694 AC_MSG_CHECKING([for ISO C99 support to TR1 in <ctype.h>])
1695 AC_CACHE_VAL(glibcxx_cv_c99_ctype_tr1, [
1696 AC_TRY_COMPILE([#include <ctype.h>],
1697 [int ch;
1698 int ret;
1699 ret = isblank(ch);
1700 ],[glibcxx_cv_c99_ctype_tr1=yes],
1701 [glibcxx_cv_c99_ctype_tr1=no])
1702 ])
1703 AC_MSG_RESULT($glibcxx_cv_c99_ctype_tr1)
1704 if test x"$glibcxx_cv_c99_ctype_tr1" = x"yes"; then
1705 AC_DEFINE(_GLIBCXX_USE_C99_CTYPE_TR1, 1,
1706 [Define if C99 functions in <ctype.h> should be imported in
1707 <tr1/cctype> in namespace std::tr1.])
1708 fi
1710 # Check for the existence of <fenv.h> functions.
1711 AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no)
1712 ac_c99_fenv_tr1=no;
1713 if test x"$ac_has_fenv_h" = x"yes"; then
1714 AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>])
1715 AC_TRY_COMPILE([#include <fenv.h>],
1716 [int except, mode;
1717 fexcept_t* pflag;
1718 fenv_t* penv;
1719 int ret;
1720 ret = feclearexcept(except);
1721 ret = fegetexceptflag(pflag, except);
1722 ret = feraiseexcept(except);
1723 ret = fesetexceptflag(pflag, except);
1724 ret = fetestexcept(except);
1725 ret = fegetround();
1726 ret = fesetround(mode);
1727 ret = fegetenv(penv);
1728 ret = feholdexcept(penv);
1729 ret = fesetenv(penv);
1730 ret = feupdateenv(penv);
1731 ],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no])
1732 fi
1733 AC_MSG_RESULT($ac_c99_fenv_tr1)
1734 if test x"$ac_c99_fenv_tr1" = x"yes"; then
1735 AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1,
1736 [Define if C99 functions in <fenv.h> should be imported in
1737 <tr1/cfenv> in namespace std::tr1.])
1738 fi
1740 # Check for the existence of <stdint.h> types.
1741 AC_MSG_CHECKING([for ISO C99 support to TR1 in <stdint.h>])
1742 AC_CACHE_VAL(glibcxx_cv_c99_stdint_tr1, [
1743 AC_TRY_COMPILE([#define __STDC_LIMIT_MACROS
1744 #define __STDC_CONSTANT_MACROS
1745 #include <stdint.h>],
1746 [typedef int8_t my_int8_t;
1747 my_int8_t i8 = INT8_MIN;
1748 i8 = INT8_MAX;
1749 typedef int16_t my_int16_t;
1750 my_int16_t i16 = INT16_MIN;
1751 i16 = INT16_MAX;
1752 typedef int32_t my_int32_t;
1753 my_int32_t i32 = INT32_MIN;
1754 i32 = INT32_MAX;
1755 typedef int64_t my_int64_t;
1756 my_int64_t i64 = INT64_MIN;
1757 i64 = INT64_MAX;
1758 typedef int_fast8_t my_int_fast8_t;
1759 my_int_fast8_t if8 = INT_FAST8_MIN;
1760 if8 = INT_FAST8_MAX;
1761 typedef int_fast16_t my_int_fast16_t;
1762 my_int_fast16_t if16 = INT_FAST16_MIN;
1763 if16 = INT_FAST16_MAX;
1764 typedef int_fast32_t my_int_fast32_t;
1765 my_int_fast32_t if32 = INT_FAST32_MIN;
1766 if32 = INT_FAST32_MAX;
1767 typedef int_fast64_t my_int_fast64_t;
1768 my_int_fast64_t if64 = INT_FAST64_MIN;
1769 if64 = INT_FAST64_MAX;
1770 typedef int_least8_t my_int_least8_t;
1771 my_int_least8_t il8 = INT_LEAST8_MIN;
1772 il8 = INT_LEAST8_MAX;
1773 typedef int_least16_t my_int_least16_t;
1774 my_int_least16_t il16 = INT_LEAST16_MIN;
1775 il16 = INT_LEAST16_MAX;
1776 typedef int_least32_t my_int_least32_t;
1777 my_int_least32_t il32 = INT_LEAST32_MIN;
1778 il32 = INT_LEAST32_MAX;
1779 typedef int_least64_t my_int_least64_t;
1780 my_int_least64_t il64 = INT_LEAST64_MIN;
1781 il64 = INT_LEAST64_MAX;
1782 typedef intmax_t my_intmax_t;
1783 my_intmax_t im = INTMAX_MAX;
1784 im = INTMAX_MIN;
1785 typedef intptr_t my_intptr_t;
1786 my_intptr_t ip = INTPTR_MAX;
1787 ip = INTPTR_MIN;
1788 typedef uint8_t my_uint8_t;
1789 my_uint8_t ui8 = UINT8_MAX;
1790 ui8 = UINT8_MAX;
1791 typedef uint16_t my_uint16_t;
1792 my_uint16_t ui16 = UINT16_MAX;
1793 ui16 = UINT16_MAX;
1794 typedef uint32_t my_uint32_t;
1795 my_uint32_t ui32 = UINT32_MAX;
1796 ui32 = UINT32_MAX;
1797 typedef uint64_t my_uint64_t;
1798 my_uint64_t ui64 = UINT64_MAX;
1799 ui64 = UINT64_MAX;
1800 typedef uint_fast8_t my_uint_fast8_t;
1801 my_uint_fast8_t uif8 = UINT_FAST8_MAX;
1802 uif8 = UINT_FAST8_MAX;
1803 typedef uint_fast16_t my_uint_fast16_t;
1804 my_uint_fast16_t uif16 = UINT_FAST16_MAX;
1805 uif16 = UINT_FAST16_MAX;
1806 typedef uint_fast32_t my_uint_fast32_t;
1807 my_uint_fast32_t uif32 = UINT_FAST32_MAX;
1808 uif32 = UINT_FAST32_MAX;
1809 typedef uint_fast64_t my_uint_fast64_t;
1810 my_uint_fast64_t uif64 = UINT_FAST64_MAX;
1811 uif64 = UINT_FAST64_MAX;
1812 typedef uint_least8_t my_uint_least8_t;
1813 my_uint_least8_t uil8 = UINT_LEAST8_MAX;
1814 uil8 = UINT_LEAST8_MAX;
1815 typedef uint_least16_t my_uint_least16_t;
1816 my_uint_least16_t uil16 = UINT_LEAST16_MAX;
1817 uil16 = UINT_LEAST16_MAX;
1818 typedef uint_least32_t my_uint_least32_t;
1819 my_uint_least32_t uil32 = UINT_LEAST32_MAX;
1820 uil32 = UINT_LEAST32_MAX;
1821 typedef uint_least64_t my_uint_least64_t;
1822 my_uint_least64_t uil64 = UINT_LEAST64_MAX;
1823 uil64 = UINT_LEAST64_MAX;
1824 typedef uintmax_t my_uintmax_t;
1825 my_uintmax_t uim = UINTMAX_MAX;
1826 uim = UINTMAX_MAX;
1827 typedef uintptr_t my_uintptr_t;
1828 my_uintptr_t uip = UINTPTR_MAX;
1829 uip = UINTPTR_MAX;
1830 ],[glibcxx_cv_c99_stdint_tr1=yes],
1831 [glibcxx_cv_c99_stdint_tr1=no])
1832 ])
1833 AC_MSG_RESULT($glibcxx_cv_c99_stdint_tr1)
1834 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1835 AC_DEFINE(_GLIBCXX_USE_C99_STDINT_TR1, 1,
1836 [Define if C99 types in <stdint.h> should be imported in
1837 <tr1/cstdint> in namespace std::tr1.])
1838 fi
1840 # Check for the existence of <math.h> functions.
1841 AC_MSG_CHECKING([for ISO C99 support to TR1 in <math.h>])
1842 AC_CACHE_VAL(glibcxx_cv_c99_math_tr1, [
1843 AC_TRY_COMPILE([#include <math.h>],
1844 [typedef double_t my_double_t;
1845 typedef float_t my_float_t;
1846 acosh(0.0);
1847 acoshf(0.0f);
1848 acoshl(0.0l);
1849 asinh(0.0);
1850 asinhf(0.0f);
1851 asinhl(0.0l);
1852 atanh(0.0);
1853 atanhf(0.0f);
1854 atanhl(0.0l);
1855 cbrt(0.0);
1856 cbrtf(0.0f);
1857 cbrtl(0.0l);
1858 copysign(0.0, 0.0);
1859 copysignf(0.0f, 0.0f);
1860 copysignl(0.0l, 0.0l);
1861 erf(0.0);
1862 erff(0.0f);
1863 erfl(0.0l);
1864 erfc(0.0);
1865 erfcf(0.0f);
1866 erfcl(0.0l);
1867 exp2(0.0);
1868 exp2f(0.0f);
1869 exp2l(0.0l);
1870 expm1(0.0);
1871 expm1f(0.0f);
1872 expm1l(0.0l);
1873 fdim(0.0, 0.0);
1874 fdimf(0.0f, 0.0f);
1875 fdiml(0.0l, 0.0l);
1876 fma(0.0, 0.0, 0.0);
1877 fmaf(0.0f, 0.0f, 0.0f);
1878 fmal(0.0l, 0.0l, 0.0l);
1879 fmax(0.0, 0.0);
1880 fmaxf(0.0f, 0.0f);
1881 fmaxl(0.0l, 0.0l);
1882 fmin(0.0, 0.0);
1883 fminf(0.0f, 0.0f);
1884 fminl(0.0l, 0.0l);
1885 hypot(0.0, 0.0);
1886 hypotf(0.0f, 0.0f);
1887 hypotl(0.0l, 0.0l);
1888 ilogb(0.0);
1889 ilogbf(0.0f);
1890 ilogbl(0.0l);
1891 lgamma(0.0);
1892 lgammaf(0.0f);
1893 lgammal(0.0l);
1894 #ifndef __APPLE__ /* see below */
1895 llrint(0.0);
1896 llrintf(0.0f);
1897 llrintl(0.0l);
1898 llround(0.0);
1899 llroundf(0.0f);
1900 llroundl(0.0l);
1901 #endif
1902 log1p(0.0);
1903 log1pf(0.0f);
1904 log1pl(0.0l);
1905 log2(0.0);
1906 log2f(0.0f);
1907 log2l(0.0l);
1908 logb(0.0);
1909 logbf(0.0f);
1910 logbl(0.0l);
1911 lrint(0.0);
1912 lrintf(0.0f);
1913 lrintl(0.0l);
1914 lround(0.0);
1915 lroundf(0.0f);
1916 lroundl(0.0l);
1917 nan(0);
1918 nanf(0);
1919 nanl(0);
1920 nearbyint(0.0);
1921 nearbyintf(0.0f);
1922 nearbyintl(0.0l);
1923 nextafter(0.0, 0.0);
1924 nextafterf(0.0f, 0.0f);
1925 nextafterl(0.0l, 0.0l);
1926 nexttoward(0.0, 0.0);
1927 nexttowardf(0.0f, 0.0f);
1928 nexttowardl(0.0l, 0.0l);
1929 remainder(0.0, 0.0);
1930 remainderf(0.0f, 0.0f);
1931 remainderl(0.0l, 0.0l);
1932 remquo(0.0, 0.0, 0);
1933 remquof(0.0f, 0.0f, 0);
1934 remquol(0.0l, 0.0l, 0);
1935 rint(0.0);
1936 rintf(0.0f);
1937 rintl(0.0l);
1938 round(0.0);
1939 roundf(0.0f);
1940 roundl(0.0l);
1941 scalbln(0.0, 0l);
1942 scalblnf(0.0f, 0l);
1943 scalblnl(0.0l, 0l);
1944 scalbn(0.0, 0);
1945 scalbnf(0.0f, 0);
1946 scalbnl(0.0l, 0);
1947 tgamma(0.0);
1948 tgammaf(0.0f);
1949 tgammal(0.0l);
1950 trunc(0.0);
1951 truncf(0.0f);
1952 truncl(0.0l);
1953 ],[glibcxx_cv_c99_math_tr1=yes], [glibcxx_cv_c99_math_tr1=no])
1954 ])
1955 AC_MSG_RESULT($glibcxx_cv_c99_math_tr1)
1956 if test x"$glibcxx_cv_c99_math_tr1" = x"yes"; then
1957 AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
1958 [Define if C99 functions or macros in <math.h> should be imported
1959 in <tr1/cmath> in namespace std::tr1.])
1961 case "${target_os}" in
1962 darwin*)
1963 AC_MSG_CHECKING([for ISO C99 rounding functions in <math.h>])
1964 AC_CACHE_VAL(glibcxx_cv_c99_math_llround, [
1965 AC_TRY_COMPILE([#include <math.h>],
1966 [llrint(0.0);
1967 llrintf(0.0f);
1968 llrintl(0.0l);
1969 llround(0.0);
1970 llroundf(0.0f);
1971 llroundl(0.0l);
1972 ],
1973 [glibcxx_cv_c99_math_llround=yes],
1974 [glibcxx_cv_c99_math_llround=no])
1975 ])
1976 AC_MSG_RESULT($glibcxx_cv_c99_math_llround)
1977 ;;
1978 esac
1979 if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
1980 AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
1981 [Define if C99 llrint and llround functions are missing from <math.h>.])
1982 fi
1983 fi
1985 # Check for the existence of <inttypes.h> functions (NB: doesn't make
1986 # sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1987 ac_c99_inttypes_tr1=no;
1988 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1989 AC_MSG_CHECKING([for ISO C99 support to TR1 in <inttypes.h>])
1990 AC_TRY_COMPILE([#include <inttypes.h>],
1991 [intmax_t i, numer, denom, base;
1992 const char* s;
1993 char** endptr;
1994 intmax_t ret = imaxabs(i);
1995 imaxdiv_t dret = imaxdiv(numer, denom);
1996 ret = strtoimax(s, endptr, base);
1997 uintmax_t uret = strtoumax(s, endptr, base);
1998 ],[ac_c99_inttypes_tr1=yes], [ac_c99_inttypes_tr1=no])
1999 fi
2000 AC_MSG_RESULT($ac_c99_inttypes_tr1)
2001 if test x"$ac_c99_inttypes_tr1" = x"yes"; then
2002 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_TR1, 1,
2003 [Define if C99 functions in <inttypes.h> should be imported in
2004 <tr1/cinttypes> in namespace std::tr1.])
2005 fi
2007 # Check for the existence of wchar_t <inttypes.h> functions (NB: doesn't
2008 # make sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
2009 ac_c99_inttypes_wchar_t_tr1=no;
2010 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
2011 AC_MSG_CHECKING([for wchar_t ISO C99 support to TR1 in <inttypes.h>])
2012 AC_TRY_COMPILE([#include <inttypes.h>],
2013 [intmax_t base;
2014 const wchar_t* s;
2015 wchar_t** endptr;
2016 intmax_t ret = wcstoimax(s, endptr, base);
2017 uintmax_t uret = wcstoumax(s, endptr, base);
2018 ],[ac_c99_inttypes_wchar_t_tr1=yes],
2019 [ac_c99_inttypes_wchar_t_tr1=no])
2020 fi
2021 AC_MSG_RESULT($ac_c99_inttypes_wchar_t_tr1)
2022 if test x"$ac_c99_inttypes_wchar_t_tr1" = x"yes"; then
2023 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1, 1,
2024 [Define if wchar_t C99 functions in <inttypes.h> should be
2025 imported in <tr1/cinttypes> in namespace std::tr1.])
2026 fi
2028 # Check for the existence of the <stdbool.h> header.
2029 AC_CHECK_HEADERS(stdbool.h)
2031 # Check for the existence of the <stdalign.h> header.
2032 AC_CHECK_HEADERS(stdalign.h)
2034 CXXFLAGS="$ac_save_CXXFLAGS"
2035 AC_LANG_RESTORE
2036 ])
2038 dnl
2039 dnl Check for uchar.h and usability.
2040 dnl
2041 AC_DEFUN([GLIBCXX_CHECK_UCHAR_H], [
2043 # Test uchar.h.
2044 AC_CHECK_HEADERS(uchar.h, ac_has_uchar_h=yes, ac_has_uchar_h=no)
2046 AC_LANG_SAVE
2047 AC_LANG_CPLUSPLUS
2048 ac_save_CXXFLAGS="$CXXFLAGS"
2049 CXXFLAGS="$CXXFLAGS -std=c++11"
2051 if test x"$ac_has_uchar_h" = x"yes"; then
2052 AC_MSG_CHECKING([for ISO C11 support for <uchar.h>])
2053 AC_TRY_COMPILE([#include <uchar.h>
2054 #ifdef __STDC_UTF_16__
2055 long i = __STDC_UTF_16__;
2056 #endif
2057 #ifdef __STDC_UTF_32__
2058 long j = __STDC_UTF_32__;
2059 #endif
2060 namespace test
2061 {
2062 using ::c16rtomb;
2063 using ::c32rtomb;
2064 using ::mbrtoc16;
2065 using ::mbrtoc32;
2066 }
2067 ],
2068 [], [ac_c11_uchar_cxx11=yes], [ac_c11_uchar_cxx11=no])
2069 else
2070 ac_c11_uchar_cxx11=no
2071 fi
2072 AC_MSG_RESULT($ac_c11_uchar_cxx11)
2073 if test x"$ac_c11_uchar_cxx11" = x"yes"; then
2074 AC_DEFINE(_GLIBCXX_USE_C11_UCHAR_CXX11, 1,
2075 [Define if C11 functions in <uchar.h> should be imported into
2076 namespace std in <cuchar>.])
2077 fi
2079 CXXFLAGS="$ac_save_CXXFLAGS"
2080 AC_LANG_RESTORE
2081 ])
2084 dnl
2085 dnl Check whether "/dev/random" and "/dev/urandom" are available for
2086 dnl class std::random_device from C++ 2011 [rand.device], and
2087 dnl random_device of "TR1" (Chapter 5.1, "Random number generation").
2088 dnl
2089 AC_DEFUN([GLIBCXX_CHECK_DEV_RANDOM], [
2091 AC_MSG_CHECKING([for "/dev/random" and "/dev/urandom" for std::random_device])
2092 AC_CACHE_VAL(glibcxx_cv_dev_random, [
2093 if test -r /dev/random && test -r /dev/urandom; then
2094 ## For MSys environment the test above is detected as false-positive
2095 ## on mingw-targets. So disable it explicitly for them.
2096 case ${target_os} in
2097 *mingw*) glibcxx_cv_dev_random=no ;;
2098 *) glibcxx_cv_dev_random=yes ;;
2099 esac
2100 else
2101 glibcxx_cv_dev_random=no;
2102 fi
2103 ])
2104 AC_MSG_RESULT($glibcxx_cv_dev_random)
2106 if test x"$glibcxx_cv_dev_random" = x"yes"; then
2107 AC_DEFINE(_GLIBCXX_USE_DEV_RANDOM, 1,
2108 [Define if /dev/random and /dev/urandom are available for
2109 std::random_device.])
2110 AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1, 1,
2111 [Define if /dev/random and /dev/urandom are available for
2112 the random_device of TR1 (Chapter 5.1).])
2113 fi
2115 ])
2117 dnl
2118 dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
2119 dnl
2120 AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
2122 AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
2123 AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
2124 [#include <stdio.h>],
2125 [AC_MSG_ERROR([computing EOF failed])])
2126 ])
2127 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_EOF, $glibcxx_cv_stdio_eof,
2128 [Define to the value of the EOF integer constant.])
2130 AC_CACHE_CHECK([for the value of SEEK_CUR], glibcxx_cv_stdio_seek_cur, [
2131 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_cur], [[SEEK_CUR]],
2132 [#include <stdio.h>],
2133 [AC_MSG_ERROR([computing SEEK_CUR failed])])
2134 ])
2135 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_CUR, $glibcxx_cv_stdio_seek_cur,
2136 [Define to the value of the SEEK_CUR integer constant.])
2138 AC_CACHE_CHECK([for the value of SEEK_END], glibcxx_cv_stdio_seek_end, [
2139 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_end], [[SEEK_END]],
2140 [#include <stdio.h>],
2141 [AC_MSG_ERROR([computing SEEK_END failed])])
2142 ])
2143 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
2144 [Define to the value of the SEEK_END integer constant.])
2145 ])
2147 dnl
2148 dnl Check whether required C++ overloads are present in <stdio.h>.
2149 dnl
2150 AC_DEFUN([GLIBCXX_CHECK_STDIO_PROTO], [
2152 AC_LANG_SAVE
2153 AC_LANG_CPLUSPLUS
2154 # Use C++11 because a conforming <stdio.h> won't define gets for C++14,
2155 # and we don't need a declaration for C++14 anyway.
2156 ac_save_CXXFLAGS="$CXXFLAGS"
2157 CXXFLAGS="$CXXFLAGS -std=gnu++11"
2159 AC_MSG_CHECKING([for gets declaration])
2160 AC_CACHE_VAL(glibcxx_cv_gets, [
2161 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2162 [#include <stdio.h>
2163 namespace test
2164 {
2165 using ::gets;
2166 }
2167 ])],
2168 [glibcxx_cv_gets=yes],
2169 [glibcxx_cv_gets=no]
2170 )])
2172 if test $glibcxx_cv_gets = yes; then
2173 AC_DEFINE(HAVE_GETS, 1, [Define if gets is available in <stdio.h> before C++14.])
2174 fi
2175 AC_MSG_RESULT($glibcxx_cv_gets)
2177 CXXFLAGS="$ac_save_CXXFLAGS"
2178 AC_LANG_RESTORE
2179 ])
2181 dnl
2182 dnl Check whether required C++11 overloads for floating point and integral
2183 dnl types are present in <math.h>.
2184 dnl
2185 AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
2187 AC_LANG_SAVE
2188 AC_LANG_CPLUSPLUS
2189 ac_save_CXXFLAGS="$CXXFLAGS"
2190 CXXFLAGS="$CXXFLAGS -std=c++11"
2192 case "$host" in
2193 *-*-solaris2.*)
2194 # Solaris 12 Build 86, Solaris 11.3 SRU 3.6, and Solaris 10 Patch
2195 # 11996[67]-02 introduced the C++11 <math.h> floating point overloads.
2196 AC_MSG_CHECKING([for C++11 <math.h> floating point overloads])
2197 AC_CACHE_VAL(glibcxx_cv_math11_fp_overload, [
2198 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2199 [#include <math.h>
2200 #undef isfinite
2201 namespace std {
2202 inline bool isfinite(float __x)
2203 { return __builtin_isfinite(__x); }
2204 }
2205 ])],
2206 [glibcxx_cv_math11_fp_overload=no],
2207 [glibcxx_cv_math11_fp_overload=yes]
2208 )])
2210 # autoheader cannot handle indented templates.
2211 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_FP],
2212 [/* Define if all C++11 floating point overloads are available in <math.h>. */
2213 #if __cplusplus >= 201103L
2214 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
2215 #endif])
2217 if test $glibcxx_cv_math11_fp_overload = yes; then
2218 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_FP)
2219 fi
2220 AC_MSG_RESULT([$glibcxx_cv_math11_fp_overload])
2222 # Solaris 12 Build 90, Solaris 11.3 SRU 5.6, and Solaris 10 Patch
2223 # 11996[67]-02 introduced the C++11 <math.h> integral type overloads.
2224 AC_MSG_CHECKING([for C++11 <math.h> integral type overloads])
2225 AC_CACHE_VAL(glibcxx_cv_math11_int_overload, [
2226 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2227 [#include <math.h>
2228 namespace std {
2229 template<typename _Tp>
2230 struct __is_integer;
2231 template<>
2232 struct __is_integer<int>
2233 {
2234 enum { __value = 1 };
2235 };
2236 }
2237 namespace __gnu_cxx {
2238 template<bool, typename>
2239 struct __enable_if;
2240 template<typename _Tp>
2241 struct __enable_if<true, _Tp>
2242 { typedef _Tp __type; };
2243 }
2244 namespace std {
2245 template<typename _Tp>
2246 constexpr typename __gnu_cxx::__enable_if
2247 <__is_integer<_Tp>::__value, double>::__type
2248 log2(_Tp __x)
2249 { return __builtin_log2(__x); }
2250 }
2251 int
2252 main (void)
2253 {
2254 int i = 1000;
2255 return std::log2(i);
2256 }
2257 ])],
2258 [glibcxx_cv_math11_int_overload=no],
2259 [glibcxx_cv_math11_int_overload=yes]
2260 )])
2262 # autoheader cannot handle indented templates.
2263 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_INT],
2264 [/* Define if all C++11 integral type overloads are available in <math.h>. */
2265 #if __cplusplus >= 201103L
2266 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
2267 #endif])
2269 if test $glibcxx_cv_math11_int_overload = yes; then
2270 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_INT)
2271 fi
2272 AC_MSG_RESULT([$glibcxx_cv_math11_int_overload])
2273 ;;
2274 *)
2275 # If <math.h> defines the obsolete isinf(double) and isnan(double)
2276 # functions (instead of or as well as the C99 generic macros) then we
2277 # can't define std::isinf(double) and std::isnan(double) in <cmath>
2278 # and must use the ones from <math.h> instead.
2279 AC_MSG_CHECKING([for obsolete isinf function in <math.h>])
2280 AC_CACHE_VAL(glibcxx_cv_obsolete_isinf, [
2281 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2282 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2283 #include <math.h>
2284 #undef isinf
2285 namespace std {
2286 using ::isinf;
2287 bool isinf(float);
2288 bool isinf(long double);
2289 }
2290 using std::isinf;
2291 bool b = isinf(0.0);
2292 ])],
2293 [glibcxx_cv_obsolete_isinf=yes],
2294 [glibcxx_cv_obsolete_isinf=no]
2295 )])
2296 AC_MSG_RESULT([$glibcxx_cv_obsolete_isinf])
2297 if test $glibcxx_cv_obsolete_isinf = yes; then
2298 AC_DEFINE(HAVE_OBSOLETE_ISINF, 1,
2299 [Define if <math.h> defines obsolete isinf function.])
2300 fi
2302 AC_MSG_CHECKING([for obsolete isnan function in <math.h>])
2303 AC_CACHE_VAL(glibcxx_cv_obsolete_isnan, [
2304 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2305 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2306 #include <math.h>
2307 #undef isnan
2308 namespace std {
2309 using ::isnan;
2310 bool isnan(float);
2311 bool isnan(long double);
2312 }
2313 using std::isnan;
2314 bool b = isnan(0.0);
2315 ])],
2316 [glibcxx_cv_obsolete_isnan=yes],
2317 [glibcxx_cv_obsolete_isnan=no]
2318 )])
2319 AC_MSG_RESULT([$glibcxx_cv_obsolete_isnan])
2320 if test $glibcxx_cv_obsolete_isnan = yes; then
2321 AC_DEFINE(HAVE_OBSOLETE_ISNAN, 1,
2322 [Define if <math.h> defines obsolete isnan function.])
2323 fi
2324 ;;
2325 esac
2327 CXXFLAGS="$ac_save_CXXFLAGS"
2328 AC_LANG_RESTORE
2329 ])
2331 dnl
2332 dnl Check whether macros, etc are present for <system_error>
2333 dnl
2334 AC_DEFUN([GLIBCXX_CHECK_SYSTEM_ERROR], [
2336 m4_pushdef([n_syserr], [1])dnl
2337 m4_foreach([syserr], [EOWNERDEAD, ENOTRECOVERABLE, ENOLINK, EPROTO, ENODATA,
2338 ENOSR, ENOSTR, ETIME, EBADMSG, ECANCELED,
2339 EOVERFLOW, ENOTSUP, EIDRM, ETXTBSY,
2340 ECHILD, ENOSPC, EPERM,
2341 ETIMEDOUT, EWOULDBLOCK],
2342 [m4_pushdef([SYSERR], m4_toupper(syserr))dnl
2343 AC_MSG_CHECKING([for syserr])
2344 AC_CACHE_VAL([glibcxx_cv_system_error[]n_syserr], [
2345 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <errno.h>]],
2346 [int i = syserr;])],
2347 [glibcxx_cv_system_error[]n_syserr=yes],
2348 [glibcxx_cv_system_error[]n_syserr=no])
2349 ])
2350 AC_MSG_RESULT([$glibcxx_cv_system_error[]n_syserr])
2351 if test x"$glibcxx_cv_system_error[]n_syserr" = x"yes"; then
2352 AC_DEFINE([HAVE_]SYSERR, 1, [Define if ]syserr[ exists.])
2353 fi
2354 m4_define([n_syserr], m4_incr(n_syserr))dnl
2355 m4_popdef([SYSERR])dnl
2356 ])
2357 m4_popdef([n_syserr])dnl
2358 ])
2360 dnl
2361 dnl Check for what type of C headers to use.
2362 dnl
2363 dnl --enable-cheaders= [does stuff].
2364 dnl --disable-cheaders [does not do anything, really].
2365 dnl + Usage: GLIBCXX_ENABLE_CHEADERS[(DEFAULT)]
2366 dnl Where DEFAULT is either 'c' or 'c_std' or 'c_global'.
2367 dnl
2368 AC_DEFUN([GLIBCXX_ENABLE_CHEADERS], [
2369 GLIBCXX_ENABLE(cheaders,$1,[[[=KIND]]],
2370 [construct "C" headers for g++], [permit c|c_std|c_global])
2371 AC_MSG_NOTICE("C" header strategy set to $enable_cheaders)
2373 C_INCLUDE_DIR='${glibcxx_srcdir}/include/'$enable_cheaders
2375 # Allow overrides to configure.host here.
2376 if test $enable_cheaders = c_global; then
2377 c_compatibility=yes
2378 fi
2380 AC_SUBST(C_INCLUDE_DIR)
2381 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C, test $enable_cheaders = c)
2382 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_STD, test $enable_cheaders = c_std)
2383 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_GLOBAL, test $enable_cheaders = c_global)
2384 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_COMPATIBILITY, test $c_compatibility = yes)
2385 ])
2388 dnl
2389 dnl Check for which locale library to use. The choice is mapped to
2390 dnl a subdirectory of config/locale.
2391 dnl
2392 dnl Default is generic.
2393 dnl
2394 AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
2395 GLIBCXX_ENABLE(clocale,auto,[[[=MODEL]]],
2396 [use MODEL for target locale package],
2397 [permit generic|gnu|ieee_1003.1-2001|newlib|yes|no|auto])
2399 # Deal with gettext issues. Default to not using it (=no) until we detect
2400 # support for it later. Let the user turn it off via --e/d, but let that
2401 # default to on for easier handling.
2402 USE_NLS=no
2403 AC_ARG_ENABLE(nls,
2404 AC_HELP_STRING([--enable-nls],[use Native Language Support (default)]),
2405 [],
2406 [enable_nls=yes])
2408 # Either a known package, or "auto"
2409 if test $enable_clocale = no || test $enable_clocale = yes; then
2410 enable_clocale=auto
2411 fi
2412 enable_clocale_flag=$enable_clocale
2414 # Probe for locale model to use if none specified.
2415 # Default to "generic".
2416 if test $enable_clocale_flag = auto; then
2417 case ${target_os} in
2418 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2419 enable_clocale_flag=gnu
2420 ;;
2421 darwin*)
2422 enable_clocale_flag=darwin
2423 ;;
2424 dragonfly* | freebsd*)
2425 enable_clocale_flag=dragonfly
2426 ;;
2427 openbsd*)
2428 enable_clocale_flag=newlib
2429 ;;
2430 *)
2431 if test x"$with_newlib" = x"yes"; then
2432 enable_clocale_flag=newlib
2433 else
2434 enable_clocale_flag=generic
2435 fi
2436 ;;
2437 esac
2438 fi
2440 # Sanity check model, and test for special functionality.
2441 if test $enable_clocale_flag = gnu; then
2442 AC_EGREP_CPP([_GLIBCXX_ok], [
2443 #include <features.h>
2444 #if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined(__UCLIBC__)
2445 _GLIBCXX_ok
2446 #endif
2447 ], enable_clocale_flag=gnu, enable_clocale_flag=generic)
2449 # Set it to scream when it hurts.
2450 ac_save_CFLAGS="$CFLAGS"
2451 CFLAGS="-Wimplicit-function-declaration -Werror"
2453 # Use strxfrm_l if available.
2454 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2455 #include <string.h>
2456 #include <locale.h>],
2457 [char s[128]; __locale_t loc; strxfrm_l(s, "C", 5, loc);],
2458 AC_DEFINE(HAVE_STRXFRM_L, 1,
2459 [Define if strxfrm_l is available in <string.h>.]),)
2461 # Use strerror_l if available.
2462 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2463 #include <string.h>
2464 #include <locale.h>],
2465 [__locale_t loc; strerror_l(5, loc);],
2466 AC_DEFINE(HAVE_STRERROR_L, 1,
2467 [Define if strerror_l is available in <string.h>.]),)
2469 CFLAGS="$ac_save_CFLAGS"
2470 fi
2472 # Perhaps use strerror_r if available, and strerror_l isn't.
2473 ac_save_CFLAGS="$CFLAGS"
2474 CFLAGS="-Wimplicit-function-declaration -Werror"
2475 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2476 #include <string.h>
2477 #include <locale.h>],
2478 [char s[128]; strerror_r(5, s, 128);],
2479 AC_DEFINE(HAVE_STRERROR_R, 1,
2480 [Define if strerror_r is available in <string.h>.]),)
2481 CFLAGS="$ac_save_CFLAGS"
2483 # Set configure bits for specified locale package
2484 AC_MSG_CHECKING([for C locale to use])
2485 case ${enable_clocale_flag} in
2486 generic)
2487 AC_MSG_RESULT(generic)
2489 CLOCALE_H=config/locale/generic/c_locale.h
2490 CLOCALE_CC=config/locale/generic/c_locale.cc
2491 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2492 CCOLLATE_CC=config/locale/generic/collate_members.cc
2493 CCTYPE_CC=config/locale/generic/ctype_members.cc
2494 CMESSAGES_H=config/locale/generic/messages_members.h
2495 CMESSAGES_CC=config/locale/generic/messages_members.cc
2496 CMONEY_CC=config/locale/generic/monetary_members.cc
2497 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2498 CTIME_H=config/locale/generic/time_members.h
2499 CTIME_CC=config/locale/generic/time_members.cc
2500 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2501 ;;
2502 darwin)
2503 AC_MSG_RESULT(darwin)
2505 CLOCALE_H=config/locale/generic/c_locale.h
2506 CLOCALE_CC=config/locale/generic/c_locale.cc
2507 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2508 CCOLLATE_CC=config/locale/generic/collate_members.cc
2509 CCTYPE_CC=config/locale/darwin/ctype_members.cc
2510 CMESSAGES_H=config/locale/generic/messages_members.h
2511 CMESSAGES_CC=config/locale/generic/messages_members.cc
2512 CMONEY_CC=config/locale/generic/monetary_members.cc
2513 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2514 CTIME_H=config/locale/generic/time_members.h
2515 CTIME_CC=config/locale/generic/time_members.cc
2516 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2517 ;;
2519 dragonfly)
2520 AC_MSG_RESULT(dragonfly or freebsd)
2522 CLOCALE_H=config/locale/dragonfly/c_locale.h
2523 CLOCALE_CC=config/locale/dragonfly/c_locale.cc
2524 CCODECVT_CC=config/locale/dragonfly/codecvt_members.cc
2525 CCOLLATE_CC=config/locale/dragonfly/collate_members.cc
2526 CCTYPE_CC=config/locale/dragonfly/ctype_members.cc
2527 CMESSAGES_H=config/locale/generic/messages_members.h
2528 CMESSAGES_CC=config/locale/generic/messages_members.cc
2529 CMONEY_CC=config/locale/dragonfly/monetary_members.cc
2530 CNUMERIC_CC=config/locale/dragonfly/numeric_members.cc
2531 CTIME_H=config/locale/dragonfly/time_members.h
2532 CTIME_CC=config/locale/dragonfly/time_members.cc
2533 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2534 ;;
2536 gnu)
2537 AC_MSG_RESULT(gnu)
2539 # Declare intention to use gettext, and add support for specific
2540 # languages.
2541 # For some reason, ALL_LINGUAS has to be before AM-GNU-GETTEXT
2542 ALL_LINGUAS="de fr"
2544 # Don't call AM-GNU-GETTEXT here. Instead, assume glibc.
2545 AC_CHECK_PROG(check_msgfmt, msgfmt, yes, no)
2546 if test x"$check_msgfmt" = x"yes" && test x"$enable_nls" = x"yes"; then
2547 USE_NLS=yes
2548 fi
2549 # Export the build objects.
2550 for ling in $ALL_LINGUAS; do \
2551 glibcxx_MOFILES="$glibcxx_MOFILES $ling.mo"; \
2552 glibcxx_POFILES="$glibcxx_POFILES $ling.po"; \
2553 done
2554 AC_SUBST(glibcxx_MOFILES)
2555 AC_SUBST(glibcxx_POFILES)
2557 CLOCALE_H=config/locale/gnu/c_locale.h
2558 CLOCALE_CC=config/locale/gnu/c_locale.cc
2559 CCODECVT_CC=config/locale/gnu/codecvt_members.cc
2560 CCOLLATE_CC=config/locale/gnu/collate_members.cc
2561 CCTYPE_CC=config/locale/gnu/ctype_members.cc
2562 CMESSAGES_H=config/locale/gnu/messages_members.h
2563 CMESSAGES_CC=config/locale/gnu/messages_members.cc
2564 CMONEY_CC=config/locale/gnu/monetary_members.cc
2565 CNUMERIC_CC=config/locale/gnu/numeric_members.cc
2566 CTIME_H=config/locale/gnu/time_members.h
2567 CTIME_CC=config/locale/gnu/time_members.cc
2568 CLOCALE_INTERNAL_H=config/locale/gnu/c++locale_internal.h
2569 ;;
2570 ieee_1003.1-2001)
2571 AC_MSG_RESULT(IEEE 1003.1)
2573 CLOCALE_H=config/locale/ieee_1003.1-2001/c_locale.h
2574 CLOCALE_CC=config/locale/ieee_1003.1-2001/c_locale.cc
2575 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2576 CCOLLATE_CC=config/locale/generic/collate_members.cc
2577 CCTYPE_CC=config/locale/generic/ctype_members.cc
2578 CMESSAGES_H=config/locale/ieee_1003.1-2001/messages_members.h
2579 CMESSAGES_CC=config/locale/ieee_1003.1-2001/messages_members.cc
2580 CMONEY_CC=config/locale/generic/monetary_members.cc
2581 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2582 CTIME_H=config/locale/generic/time_members.h
2583 CTIME_CC=config/locale/generic/time_members.cc
2584 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2585 ;;
2586 newlib)
2587 AC_MSG_RESULT(newlib)
2589 CLOCALE_H=config/locale/generic/c_locale.h
2590 CLOCALE_CC=config/locale/generic/c_locale.cc
2591 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2592 CCOLLATE_CC=config/locale/generic/collate_members.cc
2593 CCTYPE_CC=config/locale/newlib/ctype_members.cc
2594 CMESSAGES_H=config/locale/generic/messages_members.h
2595 CMESSAGES_CC=config/locale/generic/messages_members.cc
2596 CMONEY_CC=config/locale/generic/monetary_members.cc
2597 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2598 CTIME_H=config/locale/generic/time_members.h
2599 CTIME_CC=config/locale/generic/time_members.cc
2600 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2601 ;;
2602 esac
2604 # This is where the testsuite looks for locale catalogs, using the
2605 # -DLOCALEDIR define during testsuite compilation.
2606 glibcxx_localedir=${glibcxx_builddir}/po/share/locale
2607 AC_SUBST(glibcxx_localedir)
2609 # A standalone libintl (e.g., GNU libintl) may be in use.
2610 if test $USE_NLS = yes; then
2611 AC_CHECK_HEADERS([libintl.h], [], USE_NLS=no)
2612 AC_SEARCH_LIBS(gettext, intl, [], USE_NLS=no)
2613 fi
2614 if test $USE_NLS = yes; then
2615 AC_DEFINE(_GLIBCXX_USE_NLS, 1,
2616 [Define if NLS translations are to be used.])
2617 fi
2619 AC_SUBST(USE_NLS)
2620 AC_SUBST(CLOCALE_H)
2621 AC_SUBST(CMESSAGES_H)
2622 AC_SUBST(CCODECVT_CC)
2623 AC_SUBST(CCOLLATE_CC)
2624 AC_SUBST(CCTYPE_CC)
2625 AC_SUBST(CMESSAGES_CC)
2626 AC_SUBST(CMONEY_CC)
2627 AC_SUBST(CNUMERIC_CC)
2628 AC_SUBST(CTIME_H)
2629 AC_SUBST(CTIME_CC)
2630 AC_SUBST(CLOCALE_CC)
2631 AC_SUBST(CLOCALE_INTERNAL_H)
2632 ])
2635 dnl
2636 dnl Check for which std::allocator base class to use. The choice is
2637 dnl mapped from a subdirectory of include/ext.
2638 dnl
2639 dnl Default is new.
2640 dnl
2641 AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
2642 AC_MSG_CHECKING([for std::allocator base class])
2643 GLIBCXX_ENABLE(libstdcxx-allocator,auto,[[[=KIND]]],
2644 [use KIND for target std::allocator base],
2645 [permit new|malloc|mt|bitmap|pool|yes|no|auto])
2647 # If they didn't use this option switch, or if they specified --enable
2648 # with no specific model, we'll have to look for one. If they
2649 # specified --disable (???), do likewise.
2650 if test $enable_libstdcxx_allocator = no ||
2651 test $enable_libstdcxx_allocator = yes;
2652 then
2653 enable_libstdcxx_allocator=auto
2654 fi
2656 # Either a known package, or "auto". Auto implies the default choice
2657 # for a particular platform.
2658 enable_libstdcxx_allocator_flag=$enable_libstdcxx_allocator
2660 # Probe for host-specific support if no specific model is specified.
2661 # Default to "new".
2662 if test $enable_libstdcxx_allocator_flag = auto; then
2663 case ${target_os} in
2664 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2665 enable_libstdcxx_allocator_flag=new
2666 ;;
2667 *)
2668 enable_libstdcxx_allocator_flag=new
2669 ;;
2670 esac
2671 fi
2672 AC_MSG_RESULT($enable_libstdcxx_allocator_flag)
2675 # Set configure bits for specified locale package
2676 case ${enable_libstdcxx_allocator_flag} in
2677 bitmap)
2678 ALLOCATOR_H=config/allocator/bitmap_allocator_base.h
2679 ALLOCATOR_NAME=__gnu_cxx::bitmap_allocator
2680 ;;
2681 malloc)
2682 ALLOCATOR_H=config/allocator/malloc_allocator_base.h
2683 ALLOCATOR_NAME=__gnu_cxx::malloc_allocator
2684 ;;
2685 mt)
2686 ALLOCATOR_H=config/allocator/mt_allocator_base.h
2687 ALLOCATOR_NAME=__gnu_cxx::__mt_alloc
2688 ;;
2689 new)
2690 ALLOCATOR_H=config/allocator/new_allocator_base.h
2691 ALLOCATOR_NAME=__gnu_cxx::new_allocator
2692 ;;
2693 pool)
2694 ALLOCATOR_H=config/allocator/pool_allocator_base.h
2695 ALLOCATOR_NAME=__gnu_cxx::__pool_alloc
2696 ;;
2697 esac
2699 GLIBCXX_CONDITIONAL(ENABLE_ALLOCATOR_NEW,
2700 test $enable_libstdcxx_allocator_flag = new)
2701 AC_SUBST(ALLOCATOR_H)
2702 AC_SUBST(ALLOCATOR_NAME)
2703 ])
2706 dnl
2707 dnl Check for whether the Boost-derived checks should be turned on.
2708 dnl
2709 dnl --enable-concept-checks turns them on.
2710 dnl --disable-concept-checks leaves them off.
2711 dnl + Usage: GLIBCXX_ENABLE_CONCEPT_CHECKS[(DEFAULT)]
2712 dnl Where DEFAULT is either `yes' or `no'.
2713 dnl
2714 AC_DEFUN([GLIBCXX_ENABLE_CONCEPT_CHECKS], [
2715 GLIBCXX_ENABLE(concept-checks,$1,,[use Boost-derived template checks])
2716 if test $enable_concept_checks = yes; then
2717 AC_DEFINE(_GLIBCXX_CONCEPT_CHECKS, 1,
2718 [Define to use concept checking code from the boost libraries.])
2719 fi
2720 ])
2722 dnl
2723 dnl Use extern templates.
2724 dnl
2725 dnl --enable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 1
2726 dnl --disable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 0
2728 dnl + Usage: GLIBCXX_ENABLE_TEMPLATE[(DEFAULT)]
2729 dnl Where DEFAULT is `yes' or `no'.
2730 dnl
2731 AC_DEFUN([GLIBCXX_ENABLE_EXTERN_TEMPLATE], [
2733 GLIBCXX_ENABLE(extern-template,$1,,[enable extern template])
2735 AC_MSG_CHECKING([for extern template support])
2736 AC_MSG_RESULT([$enable_extern_template])
2738 GLIBCXX_CONDITIONAL(ENABLE_EXTERN_TEMPLATE, test $enable_extern_template = yes)
2739 ])
2741 dnl
2742 dnl Use vtable verification.
2743 dnl
2744 dnl --enable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 1
2745 dnl --disable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 0
2747 dnl + Usage: GLIBCXX_ENABLE_VTABLE_VERIFY[(DEFAULT)]
2748 dnl Where DEFAULT is `yes' or `no'.
2749 dnl
2750 AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY], [
2752 GLIBCXX_ENABLE(vtable-verify,$1,,[enable vtable verify])
2754 AC_MSG_CHECKING([for vtable verify support])
2755 AC_MSG_RESULT([$enable_vtable_verify])
2757 vtv_cygmin=no
2758 if test $enable_vtable_verify = yes; then
2759 case ${target_os} in
2760 cygwin*|mingw32*)
2761 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2762 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2763 vtv_cygmin=yes
2764 ;;
2765 darwin*)
2766 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u,_vtable_map_vars_start -Wl,-u,_vtable_map_vars_end"
2767 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-rpath,${toplevel_builddir}/libvtv/.libs"
2768 ;;
2769 solaris2*)
2770 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2771 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-R -Wl,${toplevel_builddir}/libvtv/.libs"
2772 ;;
2773 *)
2774 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2775 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2776 ;;
2777 esac
2778 VTV_PCH_CXXFLAGS="-fvtable-verify=std"
2779 else
2780 VTV_CXXFLAGS=
2781 VTV_PCH_CXXFLAGS=
2782 VTV_CXXLINKFLAGS=
2783 fi
2785 AC_SUBST(VTV_CXXFLAGS)
2786 AC_SUBST(VTV_PCH_CXXFLAGS)
2787 AC_SUBST(VTV_CXXLINKFLAGS)
2788 AM_CONDITIONAL(VTV_CYGMIN, test x$vtv_cygmin = xyes)
2789 GLIBCXX_CONDITIONAL(ENABLE_VTABLE_VERIFY, test $enable_vtable_verify = yes)
2790 ])
2792 dnl
2793 dnl Check for parallel mode pre-requisites, including OpenMP support.
2794 dnl
2795 dnl + Usage: GLIBCXX_ENABLE_PARALLEL
2796 dnl
2797 AC_DEFUN([GLIBCXX_ENABLE_PARALLEL], [
2799 enable_parallel=no;
2801 # See if configured libgomp/omp.h exists. (libgomp may be in
2802 # noconfigdirs but not explicitly disabled.)
2803 if echo " ${TARGET_CONFIGDIRS} " | grep " libgomp " > /dev/null 2>&1 ; then
2804 enable_parallel=yes;
2805 else
2806 AC_MSG_NOTICE([target-libgomp not built])
2807 fi
2809 AC_MSG_CHECKING([for parallel mode support])
2810 AC_MSG_RESULT([$enable_parallel])
2811 ])
2814 dnl
2815 dnl Check for which I/O library to use: stdio, or something specific.
2816 dnl
2817 dnl Default is stdio.
2818 dnl
2819 AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
2820 AC_MSG_CHECKING([for underlying I/O to use])
2821 GLIBCXX_ENABLE(cstdio,stdio,[[[=PACKAGE]]],
2822 [use target-specific I/O package], [permit stdio])
2824 # Now that libio has been removed, you can have any color you want as long
2825 # as it's black. This is one big no-op until other packages are added, but
2826 # showing the framework never hurts.
2827 case ${enable_cstdio} in
2828 stdio)
2829 CSTDIO_H=config/io/c_io_stdio.h
2830 BASIC_FILE_H=config/io/basic_file_stdio.h
2831 BASIC_FILE_CC=config/io/basic_file_stdio.cc
2832 AC_MSG_RESULT(stdio)
2833 ;;
2834 esac
2836 AC_SUBST(CSTDIO_H)
2837 AC_SUBST(BASIC_FILE_H)
2838 AC_SUBST(BASIC_FILE_CC)
2839 ])
2842 dnl
2843 dnl Check for "unusual" flags to pass to the compiler while building.
2844 dnl
2845 dnl --enable-cxx-flags='-foo -bar -baz' is a general method for passing
2846 dnl experimental flags such as -fpch, -fIMI, -Dfloat=char, etc.
2847 dnl --disable-cxx-flags passes nothing.
2848 dnl + See http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00131.html
2849 dnl http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00284.html
2850 dnl http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00035.html
2851 dnl + Usage: GLIBCXX_ENABLE_CXX_FLAGS(default flags)
2852 dnl If "default flags" is an empty string, the effect is the same
2853 dnl as --disable or --enable=no.
2854 dnl
2855 AC_DEFUN([GLIBCXX_ENABLE_CXX_FLAGS], [dnl
2856 AC_MSG_CHECKING([for extra compiler flags for building])
2857 GLIBCXX_ENABLE(cxx-flags,$1,[=FLAGS],
2858 [pass compiler FLAGS when building library],
2859 [case "x$enable_cxx_flags" in
2860 xno | x) enable_cxx_flags= ;;
2861 x-*) ;;
2862 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2863 esac])
2865 # Run through flags (either default or command-line) and set anything
2866 # extra (e.g., #defines) that must accompany particular g++ options.
2867 if test -n "$enable_cxx_flags"; then
2868 for f in $enable_cxx_flags; do
2869 case "$f" in
2870 -fhonor-std) ;;
2871 -*) ;;
2872 *) # and we're trying to pass /what/ exactly?
2873 AC_MSG_ERROR([compiler flags start with a -]) ;;
2874 esac
2875 done
2876 fi
2878 EXTRA_CXX_FLAGS="$enable_cxx_flags"
2879 AC_MSG_RESULT($EXTRA_CXX_FLAGS)
2880 AC_SUBST(EXTRA_CXX_FLAGS)
2881 ])
2884 dnl
2885 dnl Check to see if debugging libraries are to be built.
2886 dnl
2887 dnl --enable-libstdcxx-debug
2888 dnl builds a separate set of debugging libraries in addition to the
2889 dnl normal (shared, static) libstdc++ binaries.
2890 dnl
2891 dnl --disable-libstdcxx-debug
2892 dnl builds only one (non-debug) version of libstdc++.
2893 dnl
2894 dnl --enable-libstdcxx-debug-flags=FLAGS
2895 dnl iff --enable-debug == yes, then use FLAGS to build the debug library.
2896 dnl
2897 dnl + Usage: GLIBCXX_ENABLE_DEBUG[(DEFAULT)]
2898 dnl Where DEFAULT is either `yes' or `no'.
2899 dnl
2900 AC_DEFUN([GLIBCXX_ENABLE_DEBUG], [
2901 AC_MSG_CHECKING([for additional debug build])
2902 GLIBCXX_ENABLE(libstdcxx-debug,$1,,[build extra debug library])
2903 AC_MSG_RESULT($enable_libstdcxx_debug)
2904 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_DEBUG, test $enable_libstdcxx_debug = yes)
2905 ])
2908 dnl
2909 dnl Check for explicit debug flags.
2910 dnl
2911 dnl --enable-libstdcxx-debug-flags='-O1'
2912 dnl is a general method for passing flags to be used when
2913 dnl building debug libraries with --enable-libstdcxx-debug.
2914 dnl
2915 dnl --disable-libstdcxx-debug-flags does nothing.
2916 dnl + Usage: GLIBCXX_ENABLE_DEBUG_FLAGS(default flags)
2917 dnl If "default flags" is an empty string, the effect is the same
2918 dnl as --disable or --enable=no.
2919 dnl
2920 AC_DEFUN([GLIBCXX_ENABLE_DEBUG_FLAGS], [
2921 GLIBCXX_ENABLE(libstdcxx-debug-flags,[$1],[=FLAGS],
2922 [pass compiler FLAGS when building debug library],
2923 [case "x$enable_libstdcxx_debug_flags" in
2924 xno | x) enable_libstdcxx_debug_flags= ;;
2925 x-*) ;;
2926 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2927 esac])
2929 # Option parsed, now set things appropriately
2930 DEBUG_FLAGS="$enable_libstdcxx_debug_flags"
2931 AC_SUBST(DEBUG_FLAGS)
2933 AC_MSG_NOTICE([Debug build flags set to $DEBUG_FLAGS])
2934 ])
2937 dnl
2938 dnl Check if the user only wants a freestanding library implementation.
2939 dnl
2940 dnl --disable-hosted-libstdcxx will turn off most of the library build,
2941 dnl installing only the headers required by [17.4.1.3] and the language
2942 dnl support library. More than that will be built (to keep the Makefiles
2943 dnl conveniently clean), but not installed.
2944 dnl
2945 dnl Sets:
2946 dnl is_hosted (yes/no)
2947 dnl
2948 dnl Defines:
2949 dnl _GLIBCXX_HOSTED (always defined, either to 1 or 0)
2950 dnl
2951 AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
2952 AC_ARG_ENABLE([hosted-libstdcxx],
2953 AC_HELP_STRING([--disable-hosted-libstdcxx],
2954 [only build freestanding C++ runtime support]),,
2955 [case "$host" in
2956 arm*-*-symbianelf*)
2957 enable_hosted_libstdcxx=no
2958 ;;
2959 *)
2960 enable_hosted_libstdcxx=yes
2961 ;;
2962 esac])
2963 if test "$enable_hosted_libstdcxx" = no; then
2964 AC_MSG_NOTICE([Only freestanding libraries will be built])
2965 is_hosted=no
2966 hosted_define=0
2967 enable_abi_check=no
2968 enable_libstdcxx_pch=no
2969 else
2970 is_hosted=yes
2971 hosted_define=1
2972 fi
2973 GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
2974 AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
2975 [Define to 1 if a full hosted library is built, or 0 if freestanding.])
2976 ])
2979 dnl
2980 dnl Check if the user wants a non-verbose library implementation.
2981 dnl
2982 dnl --disable-libstdcxx-verbose will turn off descriptive messages to
2983 dnl standard error on termination.
2984 dnl
2985 dnl Defines:
2986 dnl _GLIBCXX_VERBOSE (always defined, either to 1 or 0)
2987 dnl
2988 AC_DEFUN([GLIBCXX_ENABLE_VERBOSE], [
2989 AC_ARG_ENABLE([libstdcxx-verbose],
2990 AC_HELP_STRING([--disable-libstdcxx-verbose],
2991 [disable termination messages to standard error]),,
2992 [enable_libstdcxx_verbose=yes])
2993 if test x"$enable_libstdcxx_verbose" = xyes; then
2994 verbose_define=1
2995 else
2996 AC_MSG_NOTICE([verbose termination messages are disabled])
2997 verbose_define=0
2998 fi
2999 AC_DEFINE_UNQUOTED(_GLIBCXX_VERBOSE, $verbose_define,
3000 [Define to 1 if a verbose library is built, or 0 otherwise.])
3001 ])
3004 dnl
3005 dnl Check for template specializations for the 'long long' type.
3006 dnl The result determines only whether 'long long' I/O is enabled; things
3007 dnl like numeric_limits<> specializations are always available.
3008 dnl
3009 dnl --enable-long-long defines _GLIBCXX_USE_LONG_LONG
3010 dnl --disable-long-long leaves _GLIBCXX_USE_LONG_LONG undefined
3011 dnl + Usage: GLIBCXX_ENABLE_LONG_LONG[(DEFAULT)]
3012 dnl Where DEFAULT is either `yes' or `no'.
3013 dnl
3014 AC_DEFUN([GLIBCXX_ENABLE_LONG_LONG], [
3015 GLIBCXX_ENABLE(long-long,$1,,[enable template specializations for 'long long'])
3016 if test $enable_long_long = yes; then
3017 AC_DEFINE(_GLIBCXX_USE_LONG_LONG, 1,
3018 [Define if code specialized for long long should be used.])
3019 fi
3020 AC_MSG_CHECKING([for enabled long long specializations])
3021 AC_MSG_RESULT([$enable_long_long])
3022 ])
3025 dnl
3026 dnl Check for decimal floating point.
3027 dnl See:
3028 dnl http://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float
3029 dnl
3030 dnl This checks to see if the host supports decimal floating point types.
3031 dnl
3032 dnl Defines:
3033 dnl _GLIBCXX_USE_DECIMAL_FLOAT
3034 dnl
3035 AC_DEFUN([GLIBCXX_ENABLE_DECIMAL_FLOAT], [
3037 # Fake what AC_TRY_COMPILE does, without linking as this is
3038 # unnecessary for this test.
3040 cat > conftest.$ac_ext << EOF
3041 [#]line __oline__ "configure"
3042 int main()
3043 {
3044 _Decimal32 d1;
3045 _Decimal64 d2;
3046 _Decimal128 d3;
3047 return 0;
3048 }
3049 EOF
3051 AC_MSG_CHECKING([for ISO/IEC TR 24733 ])
3052 if AC_TRY_EVAL(ac_compile); then
3053 AC_DEFINE(_GLIBCXX_USE_DECIMAL_FLOAT, 1,
3054 [Define if ISO/IEC TR 24733 decimal floating point types are supported on this host.])
3055 enable_dfp=yes
3056 else
3057 enable_dfp=no
3058 fi
3059 AC_MSG_RESULT($enable_dfp)
3060 rm -f conftest*
3061 ])
3063 dnl
3064 dnl Check for GNU 128-bit integer and floating point types.
3065 dnl
3066 dnl Note: also checks that the types aren't standard types.
3067 dnl
3068 dnl Defines:
3069 dnl _GLIBCXX_USE_INT128
3070 dnl ENABLE_FLOAT128
3071 dnl
3072 AC_DEFUN([GLIBCXX_ENABLE_INT128_FLOAT128], [
3074 AC_LANG_SAVE
3075 AC_LANG_CPLUSPLUS
3077 # Fake what AC_TRY_COMPILE does, without linking as this is
3078 # unnecessary for this test.
3080 cat > conftest.$ac_ext << EOF
3081 [#]line __oline__ "configure"
3082 template<typename T1, typename T2>
3083 struct same
3084 { typedef T2 type; };
3086 template<typename T>
3087 struct same<T, T>;
3089 int main()
3090 {
3091 typename same<long, __int128>::type i1;
3092 typename same<long long, __int128>::type i2;
3093 }
3094 EOF
3096 AC_MSG_CHECKING([for __int128])
3097 if AC_TRY_EVAL(ac_compile); then
3098 AC_DEFINE(_GLIBCXX_USE_INT128, 1,
3099 [Define if __int128 is supported on this host.])
3100 enable_int128=yes
3101 else
3102 enable_int128=no
3103 fi
3104 AC_MSG_RESULT($enable_int128)
3105 rm -f conftest*
3107 cat > conftest.$ac_ext << EOF
3108 [#]line __oline__ "configure"
3109 template<typename T1, typename T2>
3110 struct same
3111 { typedef T2 type; };
3113 template<typename T>
3114 struct same<T, T>;
3116 int main()
3117 {
3118 typename same<double, __float128>::type f1;
3119 typename same<long double, __float128>::type f2;
3120 }
3121 EOF
3123 AC_MSG_CHECKING([for __float128])
3124 if AC_TRY_EVAL(ac_compile); then
3125 enable_float128=yes
3126 else
3127 enable_float128=no
3128 fi
3129 AC_MSG_RESULT($enable_float128)
3130 GLIBCXX_CONDITIONAL(ENABLE_FLOAT128, test $enable_float128 = yes)
3131 rm -f conftest*
3133 AC_LANG_RESTORE
3134 ])
3136 dnl
3137 dnl Check for template specializations for the 'wchar_t' type.
3138 dnl
3139 dnl --enable-wchar_t defines _GLIBCXX_USE_WCHAR_T
3140 dnl --disable-wchar_t leaves _GLIBCXX_USE_WCHAR_T undefined
3141 dnl + Usage: GLIBCXX_ENABLE_WCHAR_T[(DEFAULT)]
3142 dnl Where DEFAULT is either `yes' or `no'.
3143 dnl
3144 dnl Necessary support must also be present.
3145 dnl
3146 AC_DEFUN([GLIBCXX_ENABLE_WCHAR_T], [
3147 GLIBCXX_ENABLE(wchar_t,$1,,[enable template specializations for 'wchar_t'])
3149 # Test wchar.h for mbstate_t, which is needed for char_traits and fpos.
3150 AC_CHECK_HEADERS(wchar.h, ac_has_wchar_h=yes, ac_has_wchar_h=no)
3151 AC_MSG_CHECKING([for mbstate_t])
3152 AC_TRY_COMPILE([#include <wchar.h>],
3153 [mbstate_t teststate;],
3154 have_mbstate_t=yes, have_mbstate_t=no)
3155 AC_MSG_RESULT($have_mbstate_t)
3156 if test x"$have_mbstate_t" = xyes; then
3157 AC_DEFINE(HAVE_MBSTATE_T,1,[Define if mbstate_t exists in wchar.h.])
3158 fi
3160 # Test it always, for use in GLIBCXX_ENABLE_C99, together with
3161 # ac_has_wchar_h.
3162 AC_CHECK_HEADERS(wctype.h, ac_has_wctype_h=yes, ac_has_wctype_h=no)
3164 if test x"$enable_wchar_t" = x"yes"; then
3166 AC_LANG_SAVE
3167 AC_LANG_CPLUSPLUS
3169 if test x"$ac_has_wchar_h" = xyes &&
3170 test x"$ac_has_wctype_h" = xyes; then
3171 AC_TRY_COMPILE([#include <wchar.h>
3172 #include <stddef.h>
3173 wint_t i;
3174 long l = WEOF;
3175 long j = WCHAR_MIN;
3176 long k = WCHAR_MAX;
3177 namespace test
3178 {
3179 using ::btowc;
3180 using ::fgetwc;
3181 using ::fgetws;
3182 using ::fputwc;
3183 using ::fputws;
3184 using ::fwide;
3185 using ::fwprintf;
3186 using ::fwscanf;
3187 using ::getwc;
3188 using ::getwchar;
3189 using ::mbrlen;
3190 using ::mbrtowc;
3191 using ::mbsinit;
3192 using ::mbsrtowcs;
3193 using ::putwc;
3194 using ::putwchar;
3195 using ::swprintf;
3196 using ::swscanf;
3197 using ::ungetwc;
3198 using ::vfwprintf;
3199 using ::vswprintf;
3200 using ::vwprintf;
3201 using ::wcrtomb;
3202 using ::wcscat;
3203 using ::wcschr;
3204 using ::wcscmp;
3205 using ::wcscoll;
3206 using ::wcscpy;
3207 using ::wcscspn;
3208 using ::wcsftime;
3209 using ::wcslen;
3210 using ::wcsncat;
3211 using ::wcsncmp;
3212 using ::wcsncpy;
3213 using ::wcspbrk;
3214 using ::wcsrchr;
3215 using ::wcsrtombs;
3216 using ::wcsspn;
3217 using ::wcsstr;
3218 using ::wcstod;
3219 using ::wcstok;
3220 using ::wcstol;
3221 using ::wcstoul;
3222 using ::wcsxfrm;
3223 using ::wctob;
3224 using ::wmemchr;
3225 using ::wmemcmp;
3226 using ::wmemcpy;
3227 using ::wmemmove;
3228 using ::wmemset;
3229 using ::wprintf;
3230 using ::wscanf;
3231 }
3232 ],[],[], [enable_wchar_t=no])
3233 else
3234 enable_wchar_t=no
3235 fi
3237 AC_LANG_RESTORE
3238 fi
3240 if test x"$enable_wchar_t" = x"yes"; then
3241 AC_DEFINE(_GLIBCXX_USE_WCHAR_T, 1,
3242 [Define if code specialized for wchar_t should be used.])
3243 fi
3245 AC_MSG_CHECKING([for enabled wchar_t specializations])
3246 AC_MSG_RESULT([$enable_wchar_t])
3247 ])
3250 dnl
3251 dnl Check to see if building and using a C++ precompiled header can be done.
3252 dnl
3253 dnl --enable-libstdcxx-pch=yes
3254 dnl default, this shows intent to use stdc++.h.gch If it looks like it
3255 dnl may work, after some light-hearted attempts to puzzle out compiler
3256 dnl support, flip bits on in include/Makefile.am
3257 dnl
3258 dnl --disable-libstdcxx-pch
3259 dnl turns off attempts to use or build stdc++.h.gch.
3260 dnl
3261 dnl Substs:
3262 dnl glibcxx_PCHFLAGS
3263 dnl
3264 AC_DEFUN([GLIBCXX_ENABLE_PCH], [
3265 GLIBCXX_ENABLE(libstdcxx-pch,$1,,[build pre-compiled libstdc++ headers])
3266 if test $enable_libstdcxx_pch = yes; then
3267 AC_CACHE_CHECK([for compiler with PCH support],
3268 [glibcxx_cv_prog_CXX_pch],
3269 [ac_save_CXXFLAGS="$CXXFLAGS"
3270 CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
3271 AC_LANG_SAVE
3272 AC_LANG_CPLUSPLUS
3273 echo '#include <math.h>' > conftest.h
3274 if $CXX $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
3275 -o conftest.h.gch 1>&5 2>&1 &&
3276 echo '#error "pch failed"' > conftest.h &&
3277 echo '#include "conftest.h"' > conftest.cc &&
3278 $CXX -c $CXXFLAGS $CPPFLAGS conftest.cc 1>&5 2>&1 ;
3279 then
3280 glibcxx_cv_prog_CXX_pch=yes
3281 else
3282 glibcxx_cv_prog_CXX_pch=no
3283 fi
3284 rm -f conftest*
3285 CXXFLAGS=$ac_save_CXXFLAGS
3286 AC_LANG_RESTORE
3287 ])
3288 enable_libstdcxx_pch=$glibcxx_cv_prog_CXX_pch
3289 fi
3291 AC_MSG_CHECKING([for enabled PCH])
3292 AC_MSG_RESULT([$enable_libstdcxx_pch])
3294 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_PCH, test $enable_libstdcxx_pch = yes)
3295 if test $enable_libstdcxx_pch = yes; then
3296 glibcxx_PCHFLAGS="-include bits/stdc++.h"
3297 else
3298 glibcxx_PCHFLAGS=""
3299 fi
3300 AC_SUBST(glibcxx_PCHFLAGS)
3301 ])
3304 dnl
3305 dnl Check for atomic builtins.
3306 dnl See:
3307 dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
3308 dnl
3309 dnl This checks to see if the host supports the compiler-generated
3310 dnl builtins for atomic operations for various integral sizes. Note, this
3311 dnl is intended to be an all-or-nothing switch, so all the atomic operations
3312 dnl that are used should be checked.
3313 dnl
3314 dnl Note:
3315 dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
3316 dnl
3317 AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
3318 AC_LANG_SAVE
3319 AC_LANG_CPLUSPLUS
3320 old_CXXFLAGS="$CXXFLAGS"
3322 # Do link tests if possible, instead asm tests, limited to some platforms
3323 # see discussion in PR target/40134, PR libstdc++/40133 and the thread
3324 # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
3325 atomic_builtins_link_tests=no
3326 if test x$gcc_no_link != xyes; then
3327 # Can do link tests. Limit to some tested platforms
3328 case "$host" in
3329 *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
3330 atomic_builtins_link_tests=yes
3331 ;;
3332 esac
3333 fi
3335 if test x$atomic_builtins_link_tests = xyes; then
3337 # Do link tests.
3339 CXXFLAGS="$CXXFLAGS -fno-exceptions"
3341 AC_MSG_CHECKING([for atomic builtins for bool])
3342 AC_CACHE_VAL(glibcxx_cv_atomic_bool, [
3343 AC_TRY_LINK(
3344 [ ],
3345 [typedef bool atomic_type;
3346 atomic_type c1;
3347 atomic_type c2;
3348 atomic_type c3(0);
3349 // N.B. __atomic_fetch_add is not supported for bool.
3350 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3351 __ATOMIC_RELAXED);
3352 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3353 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3354 ],
3355 [glibcxx_cv_atomic_bool=yes],
3356 [glibcxx_cv_atomic_bool=no])
3357 ])
3358 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3360 AC_MSG_CHECKING([for atomic builtins for short])
3361 AC_CACHE_VAL(glibcxx_cv_atomic_short, [
3362 AC_TRY_LINK(
3363 [ ],
3364 [typedef short atomic_type;
3365 atomic_type c1;
3366 atomic_type c2;
3367 atomic_type c3(0);
3368 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3369 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3370 __ATOMIC_RELAXED);
3371 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3372 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3373 ],
3374 [glibcxx_cv_atomic_short=yes],
3375 [glibcxx_cv_atomic_short=no])
3376 ])
3377 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3379 AC_MSG_CHECKING([for atomic builtins for int])
3380 AC_CACHE_VAL(glibcxx_cv_atomic_int, [
3381 AC_TRY_LINK(
3382 [ ],
3383 [typedef int atomic_type;
3384 atomic_type c1;
3385 atomic_type c2;
3386 atomic_type c3(0);
3387 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3388 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3389 __ATOMIC_RELAXED);
3390 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3391 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3392 ],
3393 [glibcxx_cv_atomic_int=yes],
3394 [glibcxx_cv_atomic_int=no])
3395 ])
3396 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3398 AC_MSG_CHECKING([for atomic builtins for long long])
3399 AC_CACHE_VAL(glibcxx_cv_atomic_long_long, [
3400 AC_TRY_LINK(
3401 [ ],
3402 [typedef long long atomic_type;
3403 atomic_type c1;
3404 atomic_type c2;
3405 atomic_type c3(0);
3406 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3407 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3408 __ATOMIC_RELAXED);
3409 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3410 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3411 ],
3412 [glibcxx_cv_atomic_long_long=yes],
3413 [glibcxx_cv_atomic_long_long=no])
3414 ])
3415 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3417 else
3419 # Do asm tests.
3421 # Compile unoptimized.
3422 CXXFLAGS='-O0 -S'
3424 # Fake what AC_TRY_COMPILE does.
3426 cat > conftest.$ac_ext << EOF
3427 [#]line __oline__ "configure"
3428 int main()
3429 {
3430 typedef bool atomic_type;
3431 atomic_type c1;
3432 atomic_type c2;
3433 atomic_type c3(0);
3434 // N.B. __atomic_fetch_add is not supported for bool.
3435 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3436 __ATOMIC_RELAXED);
3437 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3438 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3440 return 0;
3441 }
3442 EOF
3444 AC_MSG_CHECKING([for atomic builtins for bool])
3445 if AC_TRY_EVAL(ac_compile); then
3446 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3447 glibcxx_cv_atomic_bool=no
3448 else
3449 glibcxx_cv_atomic_bool=yes
3450 fi
3451 fi
3452 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3453 rm -f conftest*
3455 cat > conftest.$ac_ext << EOF
3456 [#]line __oline__ "configure"
3457 int main()
3458 {
3459 typedef short atomic_type;
3460 atomic_type c1;
3461 atomic_type c2;
3462 atomic_type c3(0);
3463 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3464 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3465 __ATOMIC_RELAXED);
3466 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3467 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3469 return 0;
3470 }
3471 EOF
3473 AC_MSG_CHECKING([for atomic builtins for short])
3474 if AC_TRY_EVAL(ac_compile); then
3475 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3476 glibcxx_cv_atomic_short=no
3477 else
3478 glibcxx_cv_atomic_short=yes
3479 fi
3480 fi
3481 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3482 rm -f conftest*
3484 cat > conftest.$ac_ext << EOF
3485 [#]line __oline__ "configure"
3486 int main()
3487 {
3488 // NB: _Atomic_word not necessarily int.
3489 typedef int atomic_type;
3490 atomic_type c1;
3491 atomic_type c2;
3492 atomic_type c3(0);
3493 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3494 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3495 __ATOMIC_RELAXED);
3496 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3497 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3499 return 0;
3500 }
3501 EOF
3503 AC_MSG_CHECKING([for atomic builtins for int])
3504 if AC_TRY_EVAL(ac_compile); then
3505 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3506 glibcxx_cv_atomic_int=no
3507 else
3508 glibcxx_cv_atomic_int=yes
3509 fi
3510 fi
3511 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3512 rm -f conftest*
3514 cat > conftest.$ac_ext << EOF
3515 [#]line __oline__ "configure"
3516 int main()
3517 {
3518 typedef long long atomic_type;
3519 atomic_type c1;
3520 atomic_type c2;
3521 atomic_type c3(0);
3522 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3523 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3524 __ATOMIC_RELAXED);
3525 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3526 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3528 return 0;
3529 }
3530 EOF
3532 AC_MSG_CHECKING([for atomic builtins for long long])
3533 if AC_TRY_EVAL(ac_compile); then
3534 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3535 glibcxx_cv_atomic_long_long=no
3536 else
3537 glibcxx_cv_atomic_long_long=yes
3538 fi
3539 fi
3540 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3541 rm -f conftest*
3543 fi
3545 CXXFLAGS="$old_CXXFLAGS"
3546 AC_LANG_RESTORE
3548 # Set atomicity_dir to builtins if all but the long long test above passes,
3549 # or if the builtins were already chosen (e.g. by configure.host).
3550 if { test "$glibcxx_cv_atomic_bool" = yes \
3551 && test "$glibcxx_cv_atomic_short" = yes \
3552 && test "$glibcxx_cv_atomic_int" = yes; } \
3553 || test "$atomicity_dir" = "cpu/generic/atomicity_builtins"; then
3554 AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS, 1,
3555 [Define if the compiler supports C++11 atomics.])
3556 atomicity_dir=cpu/generic/atomicity_builtins
3557 fi
3559 # If still generic, set to mutex.
3560 if test $atomicity_dir = "cpu/generic" ; then
3561 atomicity_dir=cpu/generic/atomicity_mutex
3562 AC_MSG_WARN([No native atomic operations are provided for this platform.])
3563 if test "x$target_thread_file" = xsingle; then
3564 AC_MSG_WARN([They cannot be faked when thread support is disabled.])
3565 AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
3566 else
3567 AC_MSG_WARN([They will be faked using a mutex.])
3568 AC_MSG_WARN([Performance of certain classes will degrade as a result.])
3569 fi
3570 fi
3572 ])
3574 dnl
3575 dnl Set default lock policy for synchronizing shared_ptr reference counting.
3576 dnl
3577 dnl --with-libstdcxx-lock-policy=auto
3578 dnl Use atomic operations for shared_ptr reference counting only if
3579 dnl the default target supports atomic compare-and-swap.
3580 dnl --with-libstdcxx-lock-policy=atomic
3581 dnl Use atomic operations for shared_ptr reference counting.
3582 dnl --with-libstdcxx-lock-policy=mutex
3583 dnl Use a mutex to synchronize shared_ptr reference counting.
3584 dnl
3585 dnl This controls the value of __gnu_cxx::__default_lock_policy, which
3586 dnl determines how shared_ptr reference counts are synchronized.
3587 dnl The option "atomic" means that atomic operations should be used,
3588 dnl "mutex" means that a mutex will be used. The default option, "auto",
3589 dnl will check if the target supports the compiler-generated builtins
3590 dnl for atomic compare-and-swap operations for 2-byte and 4-byte integers,
3591 dnl and will use "atomic" if supported, "mutex" otherwise.
3592 dnl This option is ignored if the thread model used by GCC is "single",
3593 dnl as no synchronization is used at all in that case.
3594 dnl This option affects the library ABI (except in the "single" thread model).
3595 dnl
3596 dnl Defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY to 1 if atomics should be used.
3597 dnl
3598 AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [
3600 AC_ARG_WITH([libstdcxx-lock-policy],
3601 AC_HELP_STRING([--with-libstdcxx-lock-policy={atomic,mutex,auto}],
3602 [synchronization policy for shared_ptr reference counting [default=auto]]),
3603 [libstdcxx_atomic_lock_policy=$withval],
3604 [libstdcxx_atomic_lock_policy=auto])
3606 case "$libstdcxx_atomic_lock_policy" in
3607 atomic|mutex|auto) ;;
3608 *) AC_MSG_ERROR([Invalid argument for --with-libstdcxx-lock-policy]) ;;
3609 esac
3610 AC_MSG_CHECKING([for lock policy for shared_ptr reference counts])
3612 if test x"$libstdcxx_atomic_lock_policy" = x"auto"; then
3613 AC_LANG_SAVE
3614 AC_LANG_CPLUSPLUS
3615 ac_save_CXXFLAGS="$CXXFLAGS"
3617 dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?!
3618 AC_TRY_COMPILE([
3619 #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
3620 # error "No 2-byte compare-and-swap"
3621 #elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
3622 # error "No 4-byte compare-and-swap"
3623 #endif
3624 ],,
3625 [libstdcxx_atomic_lock_policy=atomic],
3626 [libstdcxx_atomic_lock_policy=mutex])
3627 AC_LANG_RESTORE
3628 CXXFLAGS="$ac_save_CXXFLAGS"
3629 fi
3631 if test x"$libstdcxx_atomic_lock_policy" = x"atomic"; then
3632 AC_MSG_RESULT(atomic)
3633 AC_DEFINE(HAVE_ATOMIC_LOCK_POLICY,1,
3634 [Defined if shared_ptr reference counting should use atomic operations.])
3635 else
3636 AC_MSG_RESULT(mutex)
3637 fi
3639 ])
3641 dnl
3642 dnl Allow visibility attributes to be used on namespaces, objects, etc.
3643 dnl
3644 dnl --enable-libstdcxx-visibility enables attempt to use visibility attributes.
3645 dnl --disable-libstdcxx-visibility turns off all use of visibility attributes.
3646 dnl + Usage: GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY[(DEFAULT)]
3647 dnl Where DEFAULT is 'yes'.
3648 dnl
3649 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY], [
3650 GLIBCXX_ENABLE(libstdcxx-visibility,$1,,[enables visibility safe usage])
3652 if test x$enable_libstdcxx_visibility = xyes ; then
3653 dnl all hail libgfortran
3654 dnl Check whether the target supports hidden visibility.
3655 AC_CACHE_CHECK([whether the target supports hidden visibility],
3656 glibcxx_cv_have_attribute_visibility, [
3657 save_CFLAGS="$CFLAGS"
3658 CFLAGS="$CFLAGS -Werror"
3659 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
3660 [], glibcxx_cv_have_attribute_visibility=yes,
3661 glibcxx_cv_have_attribute_visibility=no)
3662 CFLAGS="$save_CFLAGS"])
3663 if test $glibcxx_cv_have_attribute_visibility = no; then
3664 enable_libstdcxx_visibility=no
3665 fi
3666 fi
3668 GLIBCXX_CONDITIONAL(ENABLE_VISIBILITY, test $enable_libstdcxx_visibility = yes)
3669 AC_MSG_NOTICE([visibility supported: $enable_libstdcxx_visibility])
3670 ])
3673 dnl
3674 dnl Add version tags to symbols in shared library (or not), additionally
3675 dnl marking other symbols as private/local (or not).
3676 dnl
3677 dnl Sets libtool_VERSION, and determines shared library SONAME.
3678 dnl
3679 dnl This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
3680 dnl
3681 dnl --enable-symvers=style adds a version script to the linker call when
3682 dnl creating the shared library. The choice of version script is
3683 dnl controlled by 'style'.
3684 dnl --disable-symvers does not.
3685 dnl
3686 dnl + Usage: GLIBCXX_ENABLE_SYMVERS[(DEFAULT)]
3687 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
3688 dnl choose a default style based on linker characteristics. Passing
3689 dnl 'no' disables versioning.
3690 dnl
3691 AC_DEFUN([GLIBCXX_ENABLE_SYMVERS], [
3693 GLIBCXX_ENABLE(symvers,$1,[[[=STYLE]]],
3694 [enables symbol versioning of the shared library],
3695 [permit yes|no|gnu|gnu-versioned-namespace|darwin|darwin-export|sun])
3697 # If we never went through the GLIBCXX_CHECK_LINKER_FEATURES macro, then we
3698 # don't know enough about $LD to do tricks...
3699 AC_REQUIRE([GLIBCXX_CHECK_LINKER_FEATURES])
3700 # Sun style symbol versions needs GNU c++filt for make_sunver.pl to work
3701 # with extern "C++" in version scripts.
3702 AC_REQUIRE([GCC_PROG_GNU_CXXFILT])
3704 # Turn a 'yes' into a suitable default.
3705 if test x$enable_symvers = xyes ; then
3706 if test $enable_shared = no || test "x$LD" = x || test x$gcc_no_link = xyes; then
3707 enable_symvers=no
3708 else
3709 if test $with_gnu_ld = yes ; then
3710 case ${target_os} in
3711 hpux*)
3712 enable_symvers=no ;;
3713 *)
3714 enable_symvers=gnu ;;
3715 esac
3716 else
3717 case ${target_os} in
3718 darwin*)
3719 enable_symvers=darwin ;;
3720 # Sun symbol versioning exists since Solaris 2.5.
3721 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
3722 # make_sunver.pl needs GNU c++filt to support extern "C++" in
3723 # version scripts, so disable symbol versioning if none can be
3724 # found.
3725 if test -z "$ac_cv_path_CXXFILT"; then
3726 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3727 AC_MSG_WARN([=== no GNU c++filt could be found.])
3728 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3729 enable_symvers=no
3730 else
3731 enable_symvers=sun
3732 fi
3733 ;;
3734 *)
3735 enable_symvers=no ;;
3736 esac
3737 fi
3738 fi
3739 fi
3741 # Check to see if 'darwin' or 'darwin-export' can win.
3742 if test x$enable_symvers = xdarwin-export ; then
3743 enable_symvers=darwin
3744 fi
3746 # Check if 'sun' was requested on non-Solaris 2 platforms.
3747 if test x$enable_symvers = xsun ; then
3748 case ${target_os} in
3749 solaris2*)
3750 # All fine.
3751 ;;
3752 *)
3753 # Unlikely to work.
3754 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3755 AC_MSG_WARN([=== you are not targetting Solaris 2.])
3756 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3757 enable_symvers=no
3758 ;;
3759 esac
3760 fi
3762 # Check to see if 'gnu' can win.
3763 if test $enable_symvers = gnu ||
3764 test $enable_symvers = gnu-versioned-namespace ||
3765 test $enable_symvers = sun; then
3766 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
3767 AC_MSG_CHECKING([for shared libgcc])
3768 ac_save_CFLAGS="$CFLAGS"
3769 CFLAGS=' -lgcc_s'
3770 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes, glibcxx_shared_libgcc=no)
3771 CFLAGS="$ac_save_CFLAGS"
3772 if test $glibcxx_shared_libgcc = no; then
3773 cat > conftest.c <<EOF
3774 int main (void) { return 0; }
3775 EOF
3776 changequote(,)dnl
3777 glibcxx_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
3778 -shared -shared-libgcc -o conftest.so \
3779 conftest.c -v 2>&1 >/dev/null \
3780 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
3781 changequote([,])dnl
3782 rm -f conftest.c conftest.so
3783 if test x${glibcxx_libgcc_s_suffix+set} = xset; then
3784 CFLAGS=" -lgcc_s$glibcxx_libgcc_s_suffix"
3785 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes)
3786 CFLAGS="$ac_save_CFLAGS"
3787 fi
3788 fi
3789 AC_MSG_RESULT($glibcxx_shared_libgcc)
3791 # For GNU ld, we need at least this version. The format is described in
3792 # GLIBCXX_CHECK_LINKER_FEATURES above.
3793 glibcxx_min_gnu_ld_version=21400
3795 # If no shared libgcc, can't win.
3796 if test $glibcxx_shared_libgcc != yes; then
3797 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3798 AC_MSG_WARN([=== you are not building a shared libgcc_s.])
3799 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3800 enable_symvers=no
3801 elif test $with_gnu_ld != yes && test $enable_symvers = sun; then
3802 : All interesting versions of Sun ld support sun style symbol versioning.
3803 elif test $with_gnu_ld != yes ; then
3804 # just fail for now
3805 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3806 AC_MSG_WARN([=== you are not using the GNU linker.])
3807 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3808 enable_symvers=no
3809 elif test $glibcxx_ld_is_gold = yes ; then
3810 : All versions of gold support symbol versioning.
3811 elif test $glibcxx_gnu_ld_version -lt $glibcxx_min_gnu_ld_version ; then
3812 # The right tools, the right setup, but too old. Fallbacks?
3813 AC_MSG_WARN(=== Linker version $glibcxx_gnu_ld_version is too old for)
3814 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
3815 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
3816 AC_MSG_WARN(=== $glibcxx_min_gnu_ld_version or later and rebuild GCC.)
3817 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3818 enable_symvers=no
3819 fi
3820 fi
3822 # For libtool versioning info, format is CURRENT:REVISION:AGE
3823 libtool_VERSION=6:26:0
3825 # Everything parsed; figure out what files and settings to use.
3826 case $enable_symvers in
3827 no)
3828 SYMVER_FILE=config/abi/pre/none.ver
3829 ;;
3830 gnu)
3831 SYMVER_FILE=config/abi/pre/gnu.ver
3832 AC_DEFINE(_GLIBCXX_SYMVER_GNU, 1,
3833 [Define to use GNU versioning in the shared library.])
3834 ;;
3835 gnu-versioned-namespace)
3836 libtool_VERSION=8:0:0
3837 SYMVER_FILE=config/abi/pre/gnu-versioned-namespace.ver
3838 AC_DEFINE(_GLIBCXX_SYMVER_GNU_NAMESPACE, 1,
3839 [Define to use GNU namespace versioning in the shared library.])
3840 ;;
3841 darwin)
3842 SYMVER_FILE=config/abi/pre/gnu.ver
3843 AC_DEFINE(_GLIBCXX_SYMVER_DARWIN, 1,
3844 [Define to use darwin versioning in the shared library.])
3845 ;;
3846 sun)
3847 SYMVER_FILE=config/abi/pre/gnu.ver
3848 AC_DEFINE(_GLIBCXX_SYMVER_SUN, 1,
3849 [Define to use Sun versioning in the shared library.])
3850 ;;
3851 esac
3853 if test x$enable_symvers != xno ; then
3854 AC_DEFINE(_GLIBCXX_SYMVER, 1,
3855 [Define to use symbol versioning in the shared library.])
3856 fi
3858 AC_CACHE_CHECK([whether the target supports .symver directive],
3859 glibcxx_cv_have_as_symver_directive, [
3860 AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
3861 [], glibcxx_cv_have_as_symver_directive=yes,
3862 glibcxx_cv_have_as_symver_directive=no)])
3863 if test $glibcxx_cv_have_as_symver_directive = yes; then
3864 AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
3865 [Define to 1 if the target assembler supports .symver directive.])
3866 fi
3868 AC_SUBST(SYMVER_FILE)
3869 AC_SUBST(port_specific_symbol_files)
3870 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS, test $enable_symvers != no)
3871 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU, test $enable_symvers = gnu)
3872 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU_NAMESPACE, test $enable_symvers = gnu-versioned-namespace)
3873 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_DARWIN, test $enable_symvers = darwin)
3874 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_SUN, test $enable_symvers = sun)
3875 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
3877 if test $enable_symvers != no ; then
3878 case ${target_os} in
3879 # The Solaris 2 runtime linker doesn't support the GNU extension of
3880 # binding the same symbol to different versions
3881 solaris2*)
3882 ;;
3883 # Other platforms with GNU symbol versioning (GNU/Linux, more?) do.
3884 *)
3885 AC_DEFINE(HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT, 1,
3886 [Define to 1 if the target runtime linker supports binding the same symbol to different versions.])
3887 ;;
3888 esac
3889 fi
3891 # Now, set up compatibility support, if any.
3892 # In addition, need this to deal with std::size_t mangling in
3893 # src/compatibility.cc. In a perfect world, could use
3894 # typeid(std::size_t).name()[0] to do direct substitution.
3895 AC_MSG_CHECKING([for size_t as unsigned int])
3896 ac_save_CFLAGS="$CFLAGS"
3897 CFLAGS="-Werror"
3898 AC_TRY_COMPILE(, [__SIZE_TYPE__* stp; unsigned int* uip; stp = uip;],
3899 [glibcxx_size_t_is_i=yes], [glibcxx_size_t_is_i=no])
3900 CFLAGS=$ac_save_CFLAGS
3901 if test "$glibcxx_size_t_is_i" = yes; then
3902 AC_DEFINE(_GLIBCXX_SIZE_T_IS_UINT, 1, [Define if size_t is unsigned int.])
3903 fi
3904 AC_MSG_RESULT([$glibcxx_size_t_is_i])
3906 AC_MSG_CHECKING([for ptrdiff_t as int])
3907 ac_save_CFLAGS="$CFLAGS"
3908 CFLAGS="-Werror"
3909 AC_TRY_COMPILE(, [__PTRDIFF_TYPE__* ptp; int* ip; ptp = ip;],
3910 [glibcxx_ptrdiff_t_is_i=yes], [glibcxx_ptrdiff_t_is_i=no])
3911 CFLAGS=$ac_save_CFLAGS
3912 if test "$glibcxx_ptrdiff_t_is_i" = yes; then
3913 AC_DEFINE(_GLIBCXX_PTRDIFF_T_IS_INT, 1, [Define if ptrdiff_t is int.])
3914 fi
3915 AC_MSG_RESULT([$glibcxx_ptrdiff_t_is_i])
3916 ])
3919 dnl
3920 dnl Setup to use the gcc gthr.h thread-specific memory and mutex model.
3921 dnl We must stage the required headers so that they will be installed
3922 dnl with the library (unlike libgcc, the STL implementation is provided
3923 dnl solely within headers). Since we must not inject random user-space
3924 dnl macro names into user-provided C++ code, we first stage into <file>-in
3925 dnl and process to <file> with an output command. The reason for a two-
3926 dnl stage process here is to correctly handle $srcdir!=$objdir without
3927 dnl having to write complex code (the sed commands to clean the macro
3928 dnl namespace are complex and fragile enough as it is). We must also
3929 dnl add a relative path so that -I- is supported properly.
3930 dnl
3931 dnl Substs:
3932 dnl thread_header
3933 dnl
3934 AC_DEFUN([GLIBCXX_ENABLE_THREADS], [
3935 AC_MSG_CHECKING([for thread model used by GCC])
3936 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3937 AC_MSG_RESULT([$target_thread_file])
3938 GCC_AC_THREAD_HEADER([$target_thread_file])
3939 ])
3942 dnl
3943 dnl Check if gthread implementation defines the types and functions
3944 dnl required by the c++0x thread library. Conforming gthread
3945 dnl implementations can define __GTHREADS_CXX0X to enable use with c++0x.
3946 dnl
3947 dnl GLIBCXX_ENABLE_SYMVERS must be done before this.
3948 dnl
3949 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
3950 GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
3952 if test x$enable_libstdcxx_threads = xauto ||
3953 test x$enable_libstdcxx_threads = xyes; then
3955 AC_LANG_SAVE
3956 AC_LANG_CPLUSPLUS
3958 ac_save_CXXFLAGS="$CXXFLAGS"
3959 CXXFLAGS="$CXXFLAGS -fno-exceptions \
3960 -I${toplevel_srcdir}/libgcc -I${toplevel_builddir}/libgcc"
3962 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3963 case $target_thread_file in
3964 posix)
3965 CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
3966 esac
3968 AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
3970 AC_TRY_COMPILE([#include <unistd.h>],
3971 [
3972 // In case of POSIX threads check _POSIX_TIMEOUTS.
3973 #if (defined(_PTHREADS) \
3974 && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
3975 #error
3976 #endif
3977 ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
3979 AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
3980 [Define to 1 if mutex_timedlock is available.])
3982 if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
3983 else res_mutex_timedlock=no ; fi
3984 AC_MSG_RESULT([$res_mutex_timedlock])
3986 AC_MSG_CHECKING([for gthreads library])
3988 AC_TRY_COMPILE([#include "gthr.h"],
3989 [
3990 #ifndef __GTHREADS_CXX0X
3991 #error
3992 #endif
3993 ], [ac_has_gthreads=yes], [ac_has_gthreads=no])
3994 else
3995 ac_has_gthreads=no
3996 fi
3998 AC_MSG_RESULT([$ac_has_gthreads])
4000 if test x"$ac_has_gthreads" = x"yes"; then
4001 AC_DEFINE(_GLIBCXX_HAS_GTHREADS, 1,
4002 [Define if gthreads library is available.])
4004 # Also check for pthread_rwlock_t for std::shared_timed_mutex in C++14
4005 AC_CHECK_TYPE([pthread_rwlock_t],
4006 [AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
4007 [Define if POSIX read/write locks are available in <gthr.h>.])],
4008 [],
4009 [#include "gthr.h"])
4010 fi
4012 CXXFLAGS="$ac_save_CXXFLAGS"
4013 AC_LANG_RESTORE
4014 ])
4017 # Check whether LC_MESSAGES is available in <locale.h>.
4018 # Ulrich Drepper <drepper@cygnus.com>, 1995.
4019 #
4020 # This file file be copied and used freely without restrictions. It can
4021 # be used in projects which are not available under the GNU Public License
4022 # but which still want to provide support for the GNU gettext functionality.
4023 # Please note that the actual code is *not* freely available.
4024 AC_DEFUN([AC_LC_MESSAGES], [
4025 AC_CHECK_HEADER(locale.h, [
4026 AC_CACHE_CHECK([for LC_MESSAGES], ac_cv_val_LC_MESSAGES,
4027 [AC_TRY_COMPILE([#include <locale.h>], [return LC_MESSAGES],
4028 ac_cv_val_LC_MESSAGES=yes, ac_cv_val_LC_MESSAGES=no)])
4029 if test $ac_cv_val_LC_MESSAGES = yes; then
4030 AC_DEFINE(HAVE_LC_MESSAGES, 1,
4031 [Define if LC_MESSAGES is available in <locale.h>.])
4032 fi
4033 ])
4034 ])
4036 dnl
4037 dnl Check whether rdrand is supported in the assembler.
4038 AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [
4039 AC_MSG_CHECKING([for rdrand support in assembler])
4040 AC_CACHE_VAL(ac_cv_x86_rdrand, [
4041 ac_cv_x86_rdrand=no
4042 case "$target" in
4043 i?86-*-* | \
4044 x86_64-*-*)
4045 AC_TRY_COMPILE(, [asm("rdrand %eax");],
4046 [ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no])
4047 esac
4048 ])
4049 if test $ac_cv_x86_rdrand = yes; then
4050 AC_DEFINE(_GLIBCXX_X86_RDRAND, 1,
4051 [ Defined if as can handle rdrand. ])
4052 fi
4053 AC_MSG_RESULT($ac_cv_x86_rdrand)
4054 ])
4056 dnl
4057 dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS.
4058 dnl
4059 AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [
4061 AC_LANG_SAVE
4062 AC_LANG_CPLUSPLUS
4063 ac_save_CXXFLAGS="$CXXFLAGS"
4064 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4066 AC_MSG_CHECKING([for get_nprocs])
4067 AC_CACHE_VAL(glibcxx_cv_GET_NPROCS, [
4068 GCC_TRY_COMPILE_OR_LINK(
4069 [#include <sys/sysinfo.h>],
4070 [int n = get_nprocs();],
4071 [glibcxx_cv_GET_NPROCS=yes],
4072 [glibcxx_cv_GET_NPROCS=no])
4073 ])
4074 if test $glibcxx_cv_GET_NPROCS = yes; then
4075 AC_DEFINE(_GLIBCXX_USE_GET_NPROCS, 1, [Define if get_nprocs is available in <sys/sysinfo.h>.])
4076 fi
4077 AC_MSG_RESULT($glibcxx_cv_GET_NPROCS)
4079 CXXFLAGS="$ac_save_CXXFLAGS"
4080 AC_LANG_RESTORE
4081 ])
4083 dnl
4084 dnl Check whether sysconf(_SC_NPROCESSORS_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROCESSORS_ONLN.
4085 dnl
4086 AC_DEFUN([GLIBCXX_CHECK_SC_NPROCESSORS_ONLN], [
4088 AC_LANG_SAVE
4089 AC_LANG_CPLUSPLUS
4090 ac_save_CXXFLAGS="$CXXFLAGS"
4091 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4093 AC_MSG_CHECKING([for _SC_NPROCESSORS_ONLN])
4094 AC_CACHE_VAL(glibcxx_cv_SC_NPROCESSORS_ONLN, [
4095 GCC_TRY_COMPILE_OR_LINK(
4096 [#include <unistd.h>],
4097 [int n = sysconf(_SC_NPROCESSORS_ONLN);],
4098 [glibcxx_cv_SC_NPROCESSORS_ONLN=yes],
4099 [glibcxx_cv_SC_NPROCESSORS_ONLN=no])
4100 ])
4101 if test $glibcxx_cv_SC_NPROCESSORS_ONLN = yes; then
4102 AC_DEFINE(_GLIBCXX_USE_SC_NPROCESSORS_ONLN, 1, [Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>.])
4103 fi
4104 AC_MSG_RESULT($glibcxx_cv_SC_NPROCESSORS_ONLN)
4106 CXXFLAGS="$ac_save_CXXFLAGS"
4107 AC_LANG_RESTORE
4108 ])
4110 dnl
4111 dnl Check whether sysconf(_SC_NPROC_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROC_ONLN.
4112 dnl
4113 AC_DEFUN([GLIBCXX_CHECK_SC_NPROC_ONLN], [
4115 AC_LANG_SAVE
4116 AC_LANG_CPLUSPLUS
4117 ac_save_CXXFLAGS="$CXXFLAGS"
4118 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4120 AC_MSG_CHECKING([for _SC_NPROC_ONLN])
4121 AC_CACHE_VAL(glibcxx_cv_SC_NPROC_ONLN, [
4122 GCC_TRY_COMPILE_OR_LINK(
4123 [#include <unistd.h>],
4124 [int n = sysconf(_SC_NPROC_ONLN);],
4125 [glibcxx_cv_SC_NPROC_ONLN=yes],
4126 [glibcxx_cv_SC_NPROC_ONLN=no])
4127 ])
4128 if test $glibcxx_cv_SC_NPROC_ONLN = yes; then
4129 AC_DEFINE(_GLIBCXX_USE_SC_NPROC_ONLN, 1, [Define if _SC_NPROC_ONLN is available in <unistd.h>.])
4130 fi
4131 AC_MSG_RESULT($glibcxx_cv_SC_NPROC_ONLN)
4133 CXXFLAGS="$ac_save_CXXFLAGS"
4134 AC_LANG_RESTORE
4135 ])
4137 dnl
4138 dnl Check whether pthread_num_processors_np is available in <pthread.h>, and define _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP.
4139 dnl
4140 AC_DEFUN([GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP], [
4142 AC_LANG_SAVE
4143 AC_LANG_CPLUSPLUS
4144 ac_save_CXXFLAGS="$CXXFLAGS"
4145 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4147 AC_MSG_CHECKING([for pthreads_num_processors_np])
4148 AC_CACHE_VAL(glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP, [
4149 GCC_TRY_COMPILE_OR_LINK(
4150 [#include <pthread.h>],
4151 [int n = pthread_num_processors_np();],
4152 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=yes],
4153 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=no])
4154 ])
4155 if test $glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP = yes; then
4156 AC_DEFINE(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP, 1, [Define if pthreads_num_processors_np is available in <pthread.h>.])
4157 fi
4158 AC_MSG_RESULT($glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP)
4160 CXXFLAGS="$ac_save_CXXFLAGS"
4161 AC_LANG_RESTORE
4162 ])
4164 dnl
4165 dnl Check whether sysctl is available in <pthread.h>, and define _GLIBCXX_USE_SYSCTL_HW_NCPU.
4166 dnl
4167 AC_DEFUN([GLIBCXX_CHECK_SYSCTL_HW_NCPU], [
4169 AC_LANG_SAVE
4170 AC_LANG_CPLUSPLUS
4171 ac_save_CXXFLAGS="$CXXFLAGS"
4172 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4174 AC_MSG_CHECKING([for hw.ncpu sysctl])
4175 AC_CACHE_VAL(glibcxx_cv_SYSCTL_HW_NCPU, [
4176 GCC_TRY_COMPILE_OR_LINK(
4177 [
4178 #include <stddef.h>
4179 #include <sys/sysctl.h>
4180 ],
4181 [
4182 int count;
4183 size_t size = sizeof(count);
4184 int mib[] = { CTL_HW, HW_NCPU };
4185 sysctl(mib, 2, &count, &size, NULL, 0);
4186 ],
4187 [glibcxx_cv_SYSCTL_HW_NCPU=yes],
4188 [glibcxx_cv_SYSCTL_HW_NCPU=no])
4189 ])
4190 if test $glibcxx_cv_SYSCTL_HW_NCPU = yes; then
4191 AC_DEFINE(_GLIBCXX_USE_SYSCTL_HW_NCPU, 1, [Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>.])
4192 fi
4193 AC_MSG_RESULT($glibcxx_cv_SYSCTL_HW_NCPU)
4195 CXXFLAGS="$ac_save_CXXFLAGS"
4196 AC_LANG_RESTORE
4197 ])
4199 dnl
4200 dnl Check to see if python pretty printing can be activated.
4201 dnl
4202 dnl --with-python-dir=dir
4203 dnl installs directory into $prefix/dir
4204 AC_DEFUN([GLIBCXX_ENABLE_PYTHON], [
4206 AC_MSG_CHECKING([for custom python install directory])
4207 AC_ARG_WITH([python-dir],
4208 AS_HELP_STRING([--with-python-dir],
4209 [the location to install Python modules. This path is relative starting from the prefix.]),
4210 [with_python_dir=$withval], [with_python_dir="no"])
4211 AC_MSG_RESULT(${with_python_dir})
4213 # Needed for installing Python modules during make install.
4214 python_mod_dir="${with_python_dir}"
4215 AC_SUBST(python_mod_dir)
4216 GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
4217 ])
4219 dnl
4220 dnl Check to see if -Werror is disabled.
4221 dnl
4222 dnl --enable-werror/--disable-werror
4223 AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
4224 AC_MSG_CHECKING([for -Werror])
4225 GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
4226 AC_MSG_RESULT($enable_werror)
4227 GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
4228 ])
4230 dnl
4231 dnl Check whether obsolescent tmpnam is available in <stdio.h>,
4232 dnl and define _GLIBCXX_USE_TMPNAM.
4233 dnl
4234 AC_DEFUN([GLIBCXX_CHECK_TMPNAM], [dnl
4235 dnl
4236 AC_LANG_SAVE
4237 AC_LANG_CPLUSPLUS
4238 ac_save_CXXFLAGS="$CXXFLAGS"
4239 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4240 dnl
4241 AC_MSG_CHECKING([for tmpnam])
4242 AC_CACHE_VAL(glibcxx_cv_TMPNAM, [dnl
4243 GCC_TRY_COMPILE_OR_LINK(
4244 [#include <stdio.h>],
4245 [char *tmp = tmpnam(NULL);],
4246 [glibcxx_cv_TMPNAM=yes],
4247 [glibcxx_cv_TMPNAM=no])
4248 ])
4249 if test $glibcxx_cv_TMPNAM = yes; then
4250 AC_DEFINE(_GLIBCXX_USE_TMPNAM, 1, [Define if obsolescent tmpnam is available in <stdio.h>.])
4251 fi
4252 AC_MSG_RESULT($glibcxx_cv_TMPNAM)
4253 dnl
4254 CXXFLAGS="$ac_save_CXXFLAGS"
4255 AC_LANG_RESTORE
4256 ])
4258 dnl
4259 dnl Check to see if sys/sdt.h exists and that it is suitable for use.
4260 dnl Some versions of sdt.h were not compatible with C++11.
4261 dnl
4262 AC_DEFUN([GLIBCXX_CHECK_SDT_H], [
4263 AC_MSG_CHECKING([for suitable sys/sdt.h])
4264 # Note that this test has to be run with the C language.
4265 # Otherwise, sdt.h will try to include some headers from
4266 # libstdc++ itself.
4267 AC_LANG_SAVE
4268 AC_LANG_C
4269 AC_CACHE_VAL(glibcxx_cv_sys_sdt_h, [
4270 # Because we have to run the test in C, we use grep rather
4271 # than the compiler to check for the bug. The bug is that
4272 # were strings without trailing whitespace, causing g++
4273 # to look for operator"". The pattern searches for the fixed
4274 # output.
4275 AC_EGREP_CPP([ \",\" ], [
4276 #include <sys/sdt.h>
4277 int f() { STAP_PROBE(hi, bob); }
4278 ], [glibcxx_cv_sys_sdt_h=yes], [glibcxx_cv_sys_sdt_h=no])
4279 ])
4280 AC_LANG_RESTORE
4281 if test $glibcxx_cv_sys_sdt_h = yes; then
4282 AC_DEFINE(HAVE_SYS_SDT_H, 1,
4283 [Define to 1 if you have a suitable <sys/sdt.h> header file])
4284 fi
4285 AC_MSG_RESULT($glibcxx_cv_sys_sdt_h)
4286 ])
4288 dnl
4289 dnl Control whether the library should define symbols for old and new ABIs.
4290 dnl This affects definitions of strings, stringstreams and locale facets.
4291 dnl
4292 dnl --disable-libstdcxx-dual-abi will use old ABI for all types.
4293 dnl
4294 dnl Defines:
4295 dnl _GLIBCXX_USE_DUAL_ABI (always defined, either to 1 or 0)
4296 dnl
4297 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_DUAL_ABI], [
4298 GLIBCXX_ENABLE(libstdcxx-dual-abi,$1,,[support two versions of std::string])
4299 if test x$enable_symvers = xgnu-versioned-namespace; then
4300 # gnu-versioned-namespace is incompatible with the dual ABI.
4301 enable_libstdcxx_dual_abi="no"
4302 fi
4303 if test x"$enable_libstdcxx_dual_abi" != xyes; then
4304 AC_MSG_NOTICE([dual ABI is disabled])
4305 default_libstdcxx_abi="gcc4-compatible"
4306 fi
4307 GLIBCXX_CONDITIONAL(ENABLE_DUAL_ABI, test $enable_libstdcxx_dual_abi = yes)
4308 ])
4310 dnl
4311 dnl Check to see which ABI should be enabled by default.
4312 dnl
4313 dnl --with-default-libstdcxx-abi={gcc4-compatible,new}
4314 dnl
4315 dnl Defines:
4316 dnl _GLIBCXX_USE_CXX11_ABI (always defined, either to 1 or 0)
4317 dnl
4318 AC_DEFUN([GLIBCXX_DEFAULT_ABI], [
4319 if test x$enable_libstdcxx_dual_abi = xyes; then
4320 AC_MSG_CHECKING([for default std::string ABI to use])
4321 AC_ARG_WITH([default-libstdcxx-abi],
4322 AS_HELP_STRING([--with-default-libstdcxx-abi],
4323 [set the std::string ABI to use by default]),
4324 [case "$withval" in
4325 gcc4-compatible) default_libstdcxx_abi="gcc4-compatible" ;;
4326 new|cxx11) default_libstdcxx_abi="new" ;;
4327 c++*|gnu++*) AC_MSG_ERROR([Supported arguments for --with-default-libstdcxx-abi have changed, use "new" or "gcc4-compatible"]) ;;
4328 *) AC_MSG_ERROR([Invalid argument for --with-default-libstdcxx-abi]) ;;
4329 esac
4330 ],
4331 [default_libstdcxx_abi="new"])
4332 AC_MSG_RESULT(${default_libstdcxx_abi})
4333 fi
4334 if test $default_libstdcxx_abi = "new"; then
4335 glibcxx_cxx11_abi=1
4336 glibcxx_cxx98_abi=0
4337 else
4338 glibcxx_cxx11_abi=0
4339 glibcxx_cxx98_abi=1
4340 fi
4341 AC_SUBST(glibcxx_cxx98_abi)
4342 GLIBCXX_CONDITIONAL(ENABLE_CXX11_ABI, test $glibcxx_cxx11_abi = 1)
4343 ])
4345 dnl
4346 dnl Check to see whether to build libstdc++fs.a
4347 dnl
4348 dnl --enable-libstdcxx-filesystem-ts
4349 dnl
4350 AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
4351 GLIBCXX_ENABLE(libstdcxx-filesystem-ts,auto,,
4352 [turns on ISO/IEC TS 18822 support],
4353 [permit yes|no|auto])
4355 AC_MSG_CHECKING([whether to build Filesystem TS support])
4356 if test x"$ac_cv_header_dirent_h" != x"yes"; then
4357 enable_libstdcxx_filesystem_ts=no
4358 fi
4359 if test x"$enable_libstdcxx_filesystem_ts" = x"auto"; then
4360 case "${target_os}" in
4361 freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
4362 enable_libstdcxx_filesystem_ts=yes
4363 ;;
4364 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
4365 enable_libstdcxx_filesystem_ts=yes
4366 ;;
4367 rtems*)
4368 enable_libstdcxx_filesystem_ts=yes
4369 ;;
4370 solaris*)
4371 enable_libstdcxx_filesystem_ts=yes
4372 ;;
4373 *)
4374 enable_libstdcxx_filesystem_ts=no
4375 ;;
4376 esac
4377 fi
4378 AC_MSG_RESULT($enable_libstdcxx_filesystem_ts)
4379 GLIBCXX_CONDITIONAL(ENABLE_FILESYSTEM_TS, test $enable_libstdcxx_filesystem_ts = yes)
4380 ])
4382 dnl
4383 dnl Check whether the library calls required by the Filesystem TS are present.
4384 dnl Defines:
4385 dnl HAVE_STRUCT_DIRENT_D_TYPE
4386 dnl _GLIBCXX_USE_REALPATH
4387 dnl _GLIBCXX_USE_UTIMENSAT
4388 dnl _GLIBCXX_USE_ST_MTIM
4389 dnl _GLIBCXX_USE_FCHMOD
4390 dnl _GLIBCXX_USE_FCHMODAT
4391 dnl _GLIBCXX_USE_SENDFILE
4392 dnl HAVE_LINK
4393 dnl HAVE_READLINK
4394 dnl HAVE_SYMLINK
4395 dnl
4396 AC_DEFUN([GLIBCXX_CHECK_FILESYSTEM_DEPS], [dnl
4397 dnl
4398 if test $enable_libstdcxx_filesystem_ts = yes; then
4399 AC_LANG_SAVE
4400 AC_LANG_CPLUSPLUS
4401 ac_save_CXXFLAGS="$CXXFLAGS"
4402 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4403 dnl
4404 AC_MSG_CHECKING([for struct dirent.d_type])
4405 AC_CACHE_VAL(glibcxx_cv_dirent_d_type, [dnl
4406 GCC_TRY_COMPILE_OR_LINK(
4407 [#include <dirent.h>],
4408 [
4409 struct dirent d;
4410 if (sizeof d.d_type) return 0;
4411 ],
4412 [glibcxx_cv_dirent_d_type=yes],
4413 [glibcxx_cv_dirent_d_type=no])
4414 ])
4415 if test $glibcxx_cv_dirent_d_type = yes; then
4416 AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE, 1, [Define to 1 if `d_type' is a member of `struct dirent'.])
4417 fi
4418 AC_MSG_RESULT($glibcxx_cv_dirent_d_type)
4419 dnl
4420 AC_MSG_CHECKING([for realpath])
4421 AC_CACHE_VAL(glibcxx_cv_realpath, [dnl
4422 GCC_TRY_COMPILE_OR_LINK(
4423 [
4424 #include <limits.h>
4425 #include <stdlib.h>
4426 #include <unistd.h>
4427 ],
4428 [
4429 #if _XOPEN_VERSION < 500
4430 #error
4431 #elif _XOPEN_VERSION >= 700 || defined(PATH_MAX)
4432 char *tmp = realpath((const char*)NULL, (char*)NULL);
4433 #else
4434 #error
4435 #endif
4436 ],
4437 [glibcxx_cv_realpath=yes],
4438 [glibcxx_cv_realpath=no])
4439 ])
4440 if test $glibcxx_cv_realpath = yes; then
4441 AC_DEFINE(_GLIBCXX_USE_REALPATH, 1, [Define if usable realpath is available in <stdlib.h>.])
4442 fi
4443 AC_MSG_RESULT($glibcxx_cv_realpath)
4444 dnl
4445 AC_MSG_CHECKING([for utimensat])
4446 AC_CACHE_VAL(glibcxx_cv_utimensat, [dnl
4447 GCC_TRY_COMPILE_OR_LINK(
4448 [
4449 #include <fcntl.h>
4450 #include <sys/stat.h>
4451 ],
4452 [
4453 struct timespec ts[2] = { { 0, UTIME_OMIT }, { 1, 1 } };
4454 int i = utimensat(AT_FDCWD, "path", ts, 0);
4455 ],
4456 [glibcxx_cv_utimensat=yes],
4457 [glibcxx_cv_utimensat=no])
4458 ])
4459 if test $glibcxx_cv_utimensat = yes; then
4460 AC_DEFINE(_GLIBCXX_USE_UTIMENSAT, 1, [Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and AT_FDCWD in <fcntl.h>.])
4461 fi
4462 AC_MSG_RESULT($glibcxx_cv_utimensat)
4463 dnl
4464 AC_MSG_CHECKING([for utime])
4465 AC_CACHE_VAL(glibcxx_cv_utime, [dnl
4466 GCC_TRY_COMPILE_OR_LINK(
4467 [
4468 #include <utime.h>
4469 ],
4470 [
4471 struct utimbuf t = { 1, 1 };
4472 int i = utime("path", &t);
4473 ],
4474 [glibcxx_cv_utime=yes],
4475 [glibcxx_cv_utime=no])
4476 ])
4477 if test $glibcxx_cv_utime = yes; then
4478 AC_DEFINE(_GLIBCXX_USE_UTIME, 1, [Define if utime is available in <utime.h>.])
4479 fi
4480 AC_MSG_RESULT($glibcxx_cv_utime)
4481 dnl
4482 AC_MSG_CHECKING([for lstat])
4483 AC_CACHE_VAL(glibcxx_cv_lstat, [dnl
4484 GCC_TRY_COMPILE_OR_LINK(
4485 [ #include <sys/stat.h> ],
4486 [
4487 struct stat st;
4488 int i = lstat("path", &st);
4489 ],
4490 [glibcxx_cv_lstat=yes],
4491 [glibcxx_cv_lstat=no])
4492 ])
4493 if test $glibcxx_cv_lstat = yes; then
4494 AC_DEFINE(_GLIBCXX_USE_LSTAT, 1, [Define if lstat is available in <sys/stat.h>.])
4495 fi
4496 AC_MSG_RESULT($glibcxx_cv_lstat)
4497 dnl
4498 AC_MSG_CHECKING([for struct stat.st_mtim.tv_nsec])
4499 AC_CACHE_VAL(glibcxx_cv_st_mtim, [dnl
4500 GCC_TRY_COMPILE_OR_LINK(
4501 [ #include <sys/stat.h> ],
4502 [
4503 struct stat st;
4504 return st.st_mtim.tv_nsec;
4505 ],
4506 [glibcxx_cv_st_mtim=yes],
4507 [glibcxx_cv_st_mtim=no])
4508 ])
4509 if test $glibcxx_cv_st_mtim = yes; then
4510 AC_DEFINE(_GLIBCXX_USE_ST_MTIM, 1, [Define if struct stat has timespec members.])
4511 fi
4512 AC_MSG_RESULT($glibcxx_cv_st_mtim)
4513 dnl
4514 AC_MSG_CHECKING([for fchmod])
4515 AC_CACHE_VAL(glibcxx_cv_fchmod, [dnl
4516 GCC_TRY_COMPILE_OR_LINK(
4517 [#include <sys/stat.h>],
4518 [fchmod(1, S_IWUSR);],
4519 [glibcxx_cv_fchmod=yes],
4520 [glibcxx_cv_fchmod=no])
4521 ])
4522 if test $glibcxx_cv_fchmod = yes; then
4523 AC_DEFINE(_GLIBCXX_USE_FCHMOD, 1, [Define if fchmod is available in <sys/stat.h>.])
4524 fi
4525 AC_MSG_RESULT($glibcxx_cv_fchmod)
4526 dnl
4527 AC_MSG_CHECKING([for fchmodat])
4528 AC_CACHE_VAL(glibcxx_cv_fchmodat, [dnl
4529 GCC_TRY_COMPILE_OR_LINK(
4530 [
4531 #include <fcntl.h>
4532 #include <sys/stat.h>
4533 ],
4534 [fchmodat(AT_FDCWD, "", 0, AT_SYMLINK_NOFOLLOW);],
4535 [glibcxx_cv_fchmodat=yes],
4536 [glibcxx_cv_fchmodat=no])
4537 ])
4538 if test $glibcxx_cv_fchmodat = yes; then
4539 AC_DEFINE(_GLIBCXX_USE_FCHMODAT, 1, [Define if fchmodat is available in <sys/stat.h>.])
4540 fi
4541 AC_MSG_RESULT($glibcxx_cv_fchmodat)
4542 dnl
4543 AC_MSG_CHECKING([for sendfile that can copy files])
4544 AC_CACHE_VAL(glibcxx_cv_sendfile, [dnl
4545 case "${target_os}" in
4546 gnu* | linux* | solaris*)
4547 GCC_TRY_COMPILE_OR_LINK(
4548 [#include <sys/sendfile.h>],
4549 [sendfile(1, 2, (off_t*)0, sizeof 1);],
4550 [glibcxx_cv_sendfile=yes],
4551 [glibcxx_cv_sendfile=no])
4552 ;;
4553 *)
4554 glibcxx_cv_sendfile=no
4555 ;;
4556 esac
4557 ])
4558 if test $glibcxx_cv_sendfile = yes; then
4559 AC_DEFINE(_GLIBCXX_USE_SENDFILE, 1, [Define if sendfile is available in <sys/sendfile.h>.])
4560 fi
4561 AC_MSG_RESULT($glibcxx_cv_sendfile)
4562 dnl
4563 AC_MSG_CHECKING([for link])
4564 AC_CACHE_VAL(glibcxx_cv_link, [dnl
4565 GCC_TRY_COMPILE_OR_LINK(
4566 [#include <unistd.h>],
4567 [link("", "");],
4568 [glibcxx_cv_link=yes],
4569 [glibcxx_cv_link=no])
4570 ])
4571 if test $glibcxx_cv_link = yes; then
4572 AC_DEFINE(HAVE_LINK, 1, [Define if link is available in <unistd.h>.])
4573 fi
4574 AC_MSG_RESULT($glibcxx_cv_link)
4575 dnl
4576 AC_MSG_CHECKING([for readlink])
4577 AC_CACHE_VAL(glibcxx_cv_readlink, [dnl
4578 GCC_TRY_COMPILE_OR_LINK(
4579 [#include <unistd.h>],
4580 [char buf[32]; readlink("", buf, sizeof(buf));],
4581 [glibcxx_cv_readlink=yes],
4582 [glibcxx_cv_readlink=no])
4583 ])
4584 if test $glibcxx_cv_readlink = yes; then
4585 AC_DEFINE(HAVE_READLINK, 1, [Define if readlink is available in <unistd.h>.])
4586 fi
4587 AC_MSG_RESULT($glibcxx_cv_readlink)
4588 dnl
4589 AC_MSG_CHECKING([for symlink])
4590 AC_CACHE_VAL(glibcxx_cv_symlink, [dnl
4591 GCC_TRY_COMPILE_OR_LINK(
4592 [#include <unistd.h>],
4593 [symlink("", "");],
4594 [glibcxx_cv_symlink=yes],
4595 [glibcxx_cv_symlink=no])
4596 ])
4597 if test $glibcxx_cv_symlink = yes; then
4598 AC_DEFINE(HAVE_SYMLINK, 1, [Define if symlink is available in <unistd.h>.])
4599 fi
4600 AC_MSG_RESULT($glibcxx_cv_symlink)
4601 dnl
4602 AC_MSG_CHECKING([for truncate])
4603 AC_CACHE_VAL(glibcxx_cv_truncate, [dnl
4604 GCC_TRY_COMPILE_OR_LINK(
4605 [#include <unistd.h>],
4606 [truncate("", 99);],
4607 [glibcxx_cv_truncate=yes],
4608 [glibcxx_cv_truncate=no])
4609 ])
4610 if test $glibcxx_cv_truncate = yes; then
4611 AC_DEFINE(HAVE_TRUNCATE, 1, [Define if truncate is available in <unistd.h>.])
4612 fi
4613 AC_MSG_RESULT($glibcxx_cv_truncate)
4614 dnl
4615 CXXFLAGS="$ac_save_CXXFLAGS"
4616 AC_LANG_RESTORE
4617 fi
4618 ])
4620 dnl
4621 dnl Check how size_t is mangled. Copied from libitm.
4622 dnl
4623 AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
4624 AC_CACHE_CHECK([how size_t is mangled],
4625 glibcxx_cv_size_t_mangling, [
4626 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
4627 [glibcxx_cv_size_t_mangling=m], [
4628 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
4629 [glibcxx_cv_size_t_mangling=j], [
4630 AC_TRY_COMPILE([],
4631 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
4632 [glibcxx_cv_size_t_mangling=y], [
4633 AC_TRY_COMPILE([],
4634 [extern __SIZE_TYPE__ x; extern unsigned short x;],
4635 [glibcxx_cv_size_t_mangling=t], [
4636 AC_TRY_COMPILE([],
4637 [extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
4638 [glibcxx_cv_size_t_mangling=u6uint20],
4639 [glibcxx_cv_size_t_mangling=x])
4640 ])
4641 ])
4642 ])
4643 ])
4644 ])
4645 if test $glibcxx_cv_size_t_mangling = x; then
4646 AC_MSG_ERROR([Unknown underlying type for size_t])
4647 fi
4648 AC_DEFINE_UNQUOTED(_GLIBCXX_MANGLE_SIZE_T, [$glibcxx_cv_size_t_mangling],
4649 [Define to the letter to which size_t is mangled.])
4650 ])
4652 dnl
4653 dnl Determine whether std::exception_ptr symbols should be exported with
4654 dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
4655 dnl release first added support for std::exception_ptr. Originally it was
4656 dnl only supported for targets with always-lock-free atomics for int, but
4657 dnl since GCC 7.1 it is supported for all targets.
4658 dnl
4659 AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
4660 if test $enable_symvers != no; then
4661 AC_MSG_CHECKING([for first version to support std::exception_ptr])
4662 case ${target} in
4663 aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
4664 m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
4665 ac_exception_ptr_since_gcc46=yes
4666 ;;
4667 *)
4668 # If the value of this macro changes then we will need to hardcode
4669 # yes/no here for additional targets based on the original value.
4670 AC_TRY_COMPILE([], [
4671 #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
4672 # error atomic int not always lock free
4673 #endif
4674 ],
4675 [ac_exception_ptr_since_gcc46=yes],
4676 [ac_exception_ptr_since_gcc46=no])
4677 ;;
4678 esac
4679 if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
4680 AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
4681 [Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
4682 AC_MSG_RESULT([4.6.0])
4683 else
4684 AC_MSG_RESULT([7.1.0])
4685 fi
4686 fi
4687 ])
4689 # Macros from the top-level gcc directory.
4690 m4_include([../config/gc++filt.m4])
4691 m4_include([../config/tls.m4])
4692 m4_include([../config/gthr.m4])
4693 m4_include([../config/cet.m4])