2 dnl GLIBCXX_CONDITIONAL (NAME, SHELL-TEST)
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.
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])
15 AC_DEFUN([GLIBCXX_EVALUATE_CONDITIONALS], [m4_undivert([glibcxx_diversion])])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.
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])
30 dnl Initialize the rest of the library configury. At this point we have
31 dnl variables like $host.
36 dnl glibcxx_builddir (absolute path)
37 dnl glibcxx_srcdir (absolute path)
38 dnl toplevel_builddir (absolute path)
39 dnl toplevel_srcdir (absolute path)
42 dnl with_target_subdir
44 dnl - the variables in GLIBCXX_CHECK_HOST / configure.host
45 dnl - default settings for all AM_CONFITIONAL test variables
46 dnl - lots of tools, like CC and CXX
48 AC_DEFUN([GLIBCXX_CONFIGURE], [
49 # Keep these sync'd with the list in Makefile.am. The first provides an
50 # expandable list at autoconf time; the second provides an expandable list
51 # (i.e., shell variable) at configure time.
52 m4_define([glibcxx_SUBDIRS],[include libsupc++ src src/c++98 src/c++11 src/c++17 src/c++20 src/filesystem doc po testsuite python])
53 SUBDIRS='glibcxx_SUBDIRS'
55 # These need to be absolute paths, yet at the same time need to
56 # canonicalize only relative paths, because then amd will not unmount
57 # drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
58 glibcxx_builddir=`${PWDCMD-pwd}`
60 [\\/$]* | ?:[\\/]*) glibcxx_srcdir=${srcdir} ;;
61 *) glibcxx_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} || echo "$srcdir"` ;;
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]))
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.
91 AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
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], [
107 ], uclibc=yes, uclibc=no)
109 AC_EGREP_CPP([_using_bionic], [
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.
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
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.
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.
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"
150 # this is the suspicious part
153 if test x"$ac_fdsections" = x"yes"; then
154 SECTION_FLAGS='-ffunction-sections -fdata-sections'
156 AC_MSG_RESULT($ac_fdsections)
159 AC_SUBST(SECTION_FLAGS)
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).
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)
174 dnl glibcxx_ld_is_gold (set to "no" or "yes")
175 dnl glibcxx_gnu_ld_version (possibly)
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.
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?
200 with_gnu_ld=$ac_cv_prog_gnu_ld
204 # Start by getting the version number. I think the libtool test already
205 # does some of this, but throws away the result.
206 glibcxx_ld_is_gold=no
207 if test x"$with_gnu_ld" = x"yes"; then
208 AC_MSG_CHECKING([for ld version])
210 if $LD --version 2>/dev/null | grep 'GNU gold' >/dev/null 2>&1; then
211 glibcxx_ld_is_gold=yes
213 ldver=`$LD --version 2>/dev/null |
214 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
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)
222 glibcxx_have_gc_sections=no
223 if test "$glibcxx_ld_is_gold" = "yes"; then
224 if $LD --help 2>/dev/null | grep gc-sections >/dev/null 2>&1; then
225 glibcxx_have_gc_sections=yes
228 glibcxx_gcsections_min_ld=21602
229 if test x"$with_gnu_ld" = x"yes" &&
230 test $glibcxx_gnu_ld_version -gt $glibcxx_gcsections_min_ld ; then
231 glibcxx_have_gc_sections=yes
234 if test "$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
251 if $CC -c conftest.c; then
252 if $LD --gc-sections -o conftest conftest.o 2>&1 | \
253 grep "Warning: gc-sections option ignored" > /dev/null; then
257 rm -f conftest.c conftest.o conftest
259 if test "$ac_gcsections" = "yes"; then
260 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
262 AC_MSG_RESULT($ac_gcsections)
264 if test "$ac_test_CFLAGS" = set; then
265 CFLAGS="$ac_save_CFLAGS"
267 # this is the suspicious part
273 # Note this is only for shared objects.
275 if test x"$with_gnu_ld" = x"yes"; then
276 # cygwin and mingw uses PE, which has no ELF relro support,
277 # multi target ld may confuse configure machinery
284 AC_MSG_CHECKING([for ld that supports -Wl,-z,relro])
285 cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
286 if test -n "$cxx_z_relo"; then
287 OPT_LDFLAGS="-Wl,-z,relro"
290 AC_MSG_RESULT($ac_ld_relro)
294 # Set linker optimization flags.
295 if test x"$with_gnu_ld" = x"yes"; then
296 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
299 AC_SUBST(SECTION_LDFLAGS)
300 AC_SUBST(OPT_LDFLAGS)
305 dnl Check for headers for, and arguments to, the setrlimit() function.
306 dnl Used only in testsuite_hooks.h. Called from GLIBCXX_CONFIGURE_TESTSUITE.
309 dnl _GLIBCXX_RES_LIMITS if we can set artificial resource limits
310 dnl various HAVE_LIMIT_* for individual limit names
312 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT_ancilliary], [
313 AC_MSG_CHECKING([for RLIMIT_$1])
316 #include <sys/time.h>
317 #include <sys/resource.h>
319 [ int f = RLIMIT_$1 ; ],
320 [glibcxx_mresult=1], [glibcxx_mresult=0])
321 AC_DEFINE_UNQUOTED(HAVE_LIMIT_$1, $glibcxx_mresult,
322 [Only used in build directory testsuite_hooks.h.])
323 if test $glibcxx_mresult = 1 ; then res=yes ; else res=no ; fi
327 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT], [
330 setrlimit_have_headers=yes
331 AC_CHECK_HEADERS(unistd.h sys/time.h sys/resource.h,
333 [setrlimit_have_headers=no])
334 # If don't have the headers, then we can't run the tests now, and we
335 # won't be seeing any of these during testsuite compilation.
336 if test $setrlimit_have_headers = yes; then
337 # Can't do these in a loop, else the resulting syntax is wrong.
338 GLIBCXX_CHECK_SETRLIMIT_ancilliary(DATA)
339 GLIBCXX_CHECK_SETRLIMIT_ancilliary(RSS)
340 GLIBCXX_CHECK_SETRLIMIT_ancilliary(VMEM)
341 GLIBCXX_CHECK_SETRLIMIT_ancilliary(AS)
342 GLIBCXX_CHECK_SETRLIMIT_ancilliary(FSIZE)
344 # Check for rlimit, setrlimit.
345 AC_CACHE_CHECK([for testsuite resource limits support],
346 glibcxx_cv_setrlimit, [
349 #include <sys/time.h>
350 #include <sys/resource.h>
354 [glibcxx_cv_setrlimit=yes], [glibcxx_cv_setrlimit=no])
357 if test $glibcxx_cv_setrlimit = yes; then
358 AC_DEFINE(_GLIBCXX_RES_LIMITS, 1,
359 [Define if using setrlimit to set resource limits during
368 dnl Check whether S_ISREG (Posix) or S_IFREG is available in <sys/stat.h>.
369 dnl Define HAVE_S_ISREG / HAVE_S_IFREG appropriately.
371 AC_DEFUN([GLIBCXX_CHECK_S_ISREG_OR_S_IFREG], [
375 ac_save_CXXFLAGS="$CXXFLAGS"
376 CXXFLAGS="$CXXFLAGS -fno-exceptions"
378 AC_MSG_CHECKING([for S_ISREG or S_IFREG])
379 AC_CACHE_VAL(glibcxx_cv_S_ISREG, [
380 GCC_TRY_COMPILE_OR_LINK(
381 [#include <sys/stat.h>],
384 S_ISREG(buffer.st_mode);],
385 [glibcxx_cv_S_ISREG=yes],
386 [glibcxx_cv_S_ISREG=no])
388 AC_CACHE_VAL(glibcxx_cv_S_IFREG, [
389 GCC_TRY_COMPILE_OR_LINK(
390 [#include <sys/stat.h>],
393 S_IFREG & buffer.st_mode;],
394 [glibcxx_cv_S_IFREG=yes],
395 [glibcxx_cv_S_IFREG=no])
398 if test $glibcxx_cv_S_ISREG = yes; then
399 AC_DEFINE(HAVE_S_ISREG, 1,
400 [Define if S_ISREG is available in <sys/stat.h>.])
402 elif test $glibcxx_cv_S_IFREG = yes; then
403 AC_DEFINE(HAVE_S_IFREG, 1,
404 [Define if S_IFREG is available in <sys/stat.h>.])
409 CXXFLAGS="$ac_save_CXXFLAGS"
415 dnl Check whether poll is available in <poll.h>, and define HAVE_POLL.
417 AC_DEFUN([GLIBCXX_CHECK_POLL], [
421 ac_save_CXXFLAGS="$CXXFLAGS"
422 CXXFLAGS="$CXXFLAGS -fno-exceptions"
424 AC_CACHE_CHECK([for poll], glibcxx_cv_POLL, [
425 GCC_TRY_COMPILE_OR_LINK(
427 [struct pollfd pfd[1];
428 pfd[0].events = POLLIN;
430 [glibcxx_cv_POLL=yes],
431 [glibcxx_cv_POLL=no])
433 if test $glibcxx_cv_POLL = yes; then
434 AC_DEFINE(HAVE_POLL, 1, [Define if poll is available in <poll.h>.])
437 CXXFLAGS="$ac_save_CXXFLAGS"
443 dnl Check whether writev is available in <sys/uio.h>, and define HAVE_WRITEV.
445 AC_DEFUN([GLIBCXX_CHECK_WRITEV], [
449 ac_save_CXXFLAGS="$CXXFLAGS"
450 CXXFLAGS="$CXXFLAGS -fno-exceptions"
452 AC_CACHE_CHECK([for writev], glibcxx_cv_WRITEV, [
453 GCC_TRY_COMPILE_OR_LINK(
454 [#include <sys/uio.h>],
455 [struct iovec iov[2];
457 [glibcxx_cv_WRITEV=yes],
458 [glibcxx_cv_WRITEV=no])
460 if test $glibcxx_cv_WRITEV = yes; then
461 AC_DEFINE(HAVE_WRITEV, 1, [Define if writev is available in <sys/uio.h>.])
464 CXXFLAGS="$ac_save_CXXFLAGS"
470 dnl Check whether LFS support is available.
472 AC_DEFUN([GLIBCXX_CHECK_LFS], [
475 ac_save_CXXFLAGS="$CXXFLAGS"
476 CXXFLAGS="$CXXFLAGS -fno-exceptions"
477 AC_CACHE_CHECK([for LFS support], glibcxx_cv_LFS, [
478 GCC_TRY_COMPILE_OR_LINK(
481 #include <sys/stat.h>
485 fseeko64(fp, 0, SEEK_CUR);
487 lseek64(1, 0, SEEK_CUR);
490 [glibcxx_cv_LFS=yes],
493 if test $glibcxx_cv_LFS = yes; then
494 AC_DEFINE(_GLIBCXX_USE_LFS, 1, [Define if LFS support is available.])
496 CXXFLAGS="$ac_save_CXXFLAGS"
502 dnl Check for whether a fully dynamic basic_string implementation should
503 dnl be turned on, that does not put empty objects in per-process static
504 dnl memory (mostly useful together with shared memory allocators, see PR
505 dnl libstdc++/16612 for details).
507 dnl --enable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 1
508 dnl --disable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 0
509 dnl otherwise undefined
510 dnl + Usage: GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING[(DEFAULT)]
511 dnl Where DEFAULT is either `yes' or `no'.
513 AC_DEFUN([GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING], [
514 GLIBCXX_ENABLE(fully-dynamic-string,$1,,[do not put empty strings in per-process static memory])
515 if test $enable_fully_dynamic_string = yes; then
516 enable_fully_dynamic_string_def=1
518 enable_fully_dynamic_string_def=0
520 AC_DEFINE_UNQUOTED([_GLIBCXX_FULLY_DYNAMIC_STRING], [${enable_fully_dynamic_string_def}],
521 [Define to 1 if a fully dynamic basic_string is wanted, 0 to disable, undefined for platform defaults])
526 dnl Does any necessary configuration of the testsuite directory. Generates
527 dnl the testsuite_hooks.h header.
529 dnl GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE must be done before this.
533 dnl GLIBCXX_TEST_WCHAR_T
534 dnl GLIBCXX_TEST_THREAD
537 dnl baseline_subdir_switch
539 AC_DEFUN([GLIBCXX_CONFIGURE_TESTSUITE], [
540 # Do checks for resource limit functions.
541 GLIBCXX_CHECK_SETRLIMIT
543 if $GLIBCXX_IS_NATIVE ; then
544 # Look for setenv, so that extended locale tests can be performed.
545 GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_3(setenv)
548 if $GLIBCXX_IS_NATIVE && test $is_hosted = yes &&
549 test $enable_symvers != no; then
552 enable_abi_check=no ;;
554 enable_abi_check=yes ;;
557 # Only build this as native, since automake does not understand
562 # Export file names for ABI checking.
563 baseline_dir="$glibcxx_srcdir/config/abi/post/${abi_baseline_pair}"
564 AC_SUBST(baseline_dir)
565 baseline_subdir_switch="$abi_baseline_subdir_switch"
566 AC_SUBST(baseline_subdir_switch)
571 dnl Does any necessary configuration for docbook in the docs directory.
573 dnl XSLTPROC must be set before this
576 dnl glibcxx_stylesheets
580 AC_DEFUN([GLIBCXX_CONFIGURE_DOCBOOK], [
582 glibcxx_docbook_url=http://docbook.sourceforge.net/release/xsl-ns/current/
584 AC_MSG_CHECKING([for local stylesheet directory])
585 glibcxx_local_stylesheets=no
586 if test x${XMLCATALOG} = xyes && xsl_style_dir=`xmlcatalog "" $glibcxx_docbook_url 2>/dev/null`
588 XSL_STYLE_DIR=`echo $xsl_style_dir | sed -n 's;^file://;;p'`
589 glibcxx_local_stylesheets=yes
592 /usr/share/sgml/docbook/xsl-ns-stylesheets \
593 /usr/share/xml/docbook/stylesheet/docbook-xsl-ns \
594 /usr/share/xml/docbook/stylesheet/nwalsh5/current \
595 /usr/share/xml/docbook/stylesheet/nwalsh/current
597 if test -d $dir; then
598 glibcxx_local_stylesheets=yes
604 AC_MSG_RESULT($glibcxx_local_stylesheets)
606 if test x"$glibcxx_local_stylesheets" = x"yes"; then
607 AC_SUBST(XSL_STYLE_DIR)
608 AC_MSG_NOTICE($XSL_STYLE_DIR)
610 AC_MSG_CHECKING([for docbook stylesheets for documentation creation])
611 glibcxx_stylesheets=no
612 if test x${XMLCATALOG} = xno || xmlcatalog "" $glibcxx_docbook_url/xhtml/docbook.xsl >/dev/null 2>&1; then
613 if test x${XSLTPROC} = xyes && echo '<title/>' | xsltproc --noout --nonet --xinclude $glibcxx_docbook_url/xhtml/docbook.xsl - 2>/dev/null; then
614 glibcxx_stylesheets=yes
617 AC_MSG_RESULT($glibcxx_stylesheets)
620 glibcxx_stylesheets=no
623 # Check for epub3 dependencies.
624 AC_MSG_CHECKING([for epub3 stylesheets for documentation creation])
625 glibcxx_epub_stylesheets=no
626 if test x"$glibcxx_local_stylesheets" = x"yes"; then
627 if test -f "$XSL_STYLE_DIR/epub3/chunk.xsl"; then
628 glibcxx_epub_stylesheets=yes
631 AC_MSG_RESULT($glibcxx_epub_stylesheets)
632 AM_CONDITIONAL(BUILD_EPUB, test x"$glibcxx_epub_stylesheets" = x"yes")
638 dnl Set up *_INCLUDES variables for all sundry Makefile.am's.
642 dnl TOPLEVEL_INCLUDES
644 AC_DEFUN([GLIBCXX_EXPORT_INCLUDES], [
645 # Used for every C++ compile we perform.
647 -I$glibcxx_builddir/include/$host_alias \
648 -I$glibcxx_builddir/include \
649 -I$glibcxx_srcdir/libsupc++"
651 # For Canadian crosses, pick this up too.
652 if test $CANADIAN = yes; then
653 GLIBCXX_INCLUDES="$GLIBCXX_INCLUDES -I\${includedir}"
656 # Stuff in the actual top level. Currently only used by libsupc++ to
657 # get unwind* headers from the libgcc dir.
658 #TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc -I$(toplevel_srcdir)/include'
659 TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc'
661 # Now, export this to all the little Makefiles....
662 AC_SUBST(GLIBCXX_INCLUDES)
663 AC_SUBST(TOPLEVEL_INCLUDES)
668 dnl Set up *_FLAGS and *FLAGS variables for all sundry Makefile.am's.
669 dnl (SECTION_FLAGS is done under CHECK_COMPILER_FEATURES.)
672 dnl OPTIMIZE_CXXFLAGS
675 AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
676 # Optimization flags that are probably a good idea for thrill-seekers. Just
677 # uncomment the lines below and make, everything else is ready to go...
678 # Alternatively OPTIMIZE_CXXFLAGS can be set in configure.host.
679 # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
680 AC_SUBST(OPTIMIZE_CXXFLAGS)
682 WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
688 dnl All installation directory information is determined here.
692 dnl glibcxx_prefixdir
693 dnl glibcxx_toolexecdir
694 dnl glibcxx_toolexeclibdir
696 dnl Assumes cross_compiling bits already done, and with_cross_host in
699 dnl This logic must match gcc/configure.ac's setting of gcc_gxx_include_dir.
700 dnl config/gxx-include-dir.m4 must be kept consistant with this as well.
701 AC_DEFUN([GLIBCXX_EXPORT_INSTALL_INFO], [
702 glibcxx_toolexecdir=no
703 glibcxx_toolexeclibdir=no
704 glibcxx_prefixdir=$prefix
706 AC_MSG_CHECKING([for gxx-include-dir])
707 AC_ARG_WITH([gxx-include-dir],
708 AC_HELP_STRING([--with-gxx-include-dir=DIR],
709 [installation directory for include files]),
711 yes) AC_MSG_ERROR([Missing directory for --with-gxx-include-dir]) ;;
712 no) gxx_include_dir=no ;;
713 *) gxx_include_dir=$withval ;;
715 [gxx_include_dir=no])
716 AC_MSG_RESULT($gxx_include_dir)
718 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
719 AC_ARG_ENABLE([version-specific-runtime-libs],
720 AC_HELP_STRING([--enable-version-specific-runtime-libs],
721 [Specify that runtime libraries should be installed in a compiler-specific directory]),
722 [case "$enableval" in
723 yes) version_specific_libs=yes ;;
724 no) version_specific_libs=no ;;
725 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
727 [version_specific_libs=no])
728 AC_MSG_RESULT($version_specific_libs)
730 GCC_WITH_TOOLEXECLIBDIR
732 # Default case for install directory for include files.
733 if test $version_specific_libs = no && test $gxx_include_dir = no; then
734 gxx_include_dir='include/c++/${gcc_version}'
735 if test -n "$with_cross_host" &&
736 test x"$with_cross_host" != x"no"; then
737 gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"
739 gxx_include_dir='${prefix}/'"$gxx_include_dir"
743 # Version-specific runtime libs processing.
744 if test $version_specific_libs = yes; then
745 # Need the gcc compiler version to know where to install libraries
746 # and header files if --enable-version-specific-runtime-libs option
747 # is selected. FIXME: these variables are misnamed, there are
748 # no executables installed in _toolexecdir or _toolexeclibdir.
749 if test x"$gxx_include_dir" = x"no"; then
750 gxx_include_dir='${libdir}/gcc/${host_alias}/${gcc_version}/include/c++'
752 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
753 glibcxx_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
756 # Calculate glibcxx_toolexecdir, glibcxx_toolexeclibdir
757 # Install a library built with a cross compiler in tooldir, not libdir.
758 if test x"$glibcxx_toolexecdir" = x"no"; then
759 if test -n "$with_cross_host" &&
760 test x"$with_cross_host" != x"no"; then
761 glibcxx_toolexecdir='${exec_prefix}/${host_alias}'
762 case ${with_toolexeclibdir} in
764 glibcxx_toolexeclibdir='${toolexecdir}/lib'
767 glibcxx_toolexeclibdir=${with_toolexeclibdir}
771 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
772 glibcxx_toolexeclibdir='${libdir}'
774 multi_os_directory=`$CXX -print-multi-os-directory`
775 case $multi_os_directory in
776 .) ;; # Avoid trailing /.
777 *) glibcxx_toolexeclibdir=$glibcxx_toolexeclibdir/$multi_os_directory ;;
781 AC_MSG_CHECKING([for install location])
782 AC_MSG_RESULT($gxx_include_dir)
784 AC_SUBST(glibcxx_prefixdir)
785 AC_SUBST(gxx_include_dir)
786 AC_SUBST(glibcxx_toolexecdir)
787 AC_SUBST(glibcxx_toolexeclibdir)
793 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
794 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
795 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
797 dnl See manual/appendix_porting.html#appendix.porting.build_hacking for
800 m4_define([GLIBCXX_ENABLE],[dnl
801 m4_define([_g_switch],[--enable-$1])dnl
802 m4_define([_g_help],[AC_HELP_STRING([_g_switch$3],[$4 @<:@default=$2@:>@])])dnl
803 AC_ARG_ENABLE([$1],m4_dquote(_g_help),
808 m4_bpatsubst([$5],[permit ])) ;;
809 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
810 dnl Idea for future: generate a URL pointing to
811 dnl "onlinedocs/configopts.html#whatever"
818 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
822 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
823 m4_undefine([_g_switch])dnl
824 m4_undefine([_g_help])dnl
829 dnl Check for ISO/IEC 9899:1999 "C99" support.
831 dnl --enable-c99 defines _GLIBCXX_USE_C99
832 dnl --disable-c99 leaves _GLIBCXX_USE_C99 undefined
833 dnl + Usage: GLIBCXX_ENABLE_C99[(DEFAULT)]
834 dnl Where DEFAULT is either `yes' or `no'.
835 dnl + If 'C99' stuff is not available, ignores DEFAULT and sets `no'.
837 AC_DEFUN([GLIBCXX_ENABLE_C99], [
838 GLIBCXX_ENABLE(c99,$1,,[turns on ISO/IEC 9899:1999 support])
840 if test x"$enable_c99" = x"yes"; then
844 # Use -std=c++98 (instead of -std=gnu++98) because leaving __STRICT_ANSI__
845 # undefined may cause fake C99 facilities, like pre-standard snprintf,
846 # to be spuriously enabled.
847 ac_save_CXXFLAGS="$CXXFLAGS"
848 CXXFLAGS="$CXXFLAGS -std=c++98"
850 ac_save_gcc_no_link="$gcc_no_link"
852 if test x$gcc_no_link != xyes; then
853 # Use -fno-exceptions to that the C driver can link these tests without
854 # hitting undefined references to personality routines.
855 CXXFLAGS="$CXXFLAGS -fno-exceptions"
856 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
857 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
862 # Check for the existence of <math.h> functions used if C99 is enabled.
863 AC_CACHE_CHECK([for ISO C99 support in <math.h> for C++98],
864 glibcxx_cv_c99_math_cxx98, [
865 GCC_TRY_COMPILE_OR_LINK(
867 volatile double d1, d2;
875 i = isgreater(d1, d2);
876 i = isgreaterequal(d1, d2);
878 i = islessequal(d1, d2);
879 i = islessgreater(d1, d2);
880 i = islessgreater(d1, d2);
881 i = isunordered(d1, d2);
882 ], [glibcxx_cv_c99_math_cxx98=yes], [glibcxx_cv_c99_math_cxx98=no])
884 if test x"$glibcxx_cv_c99_math_cxx98" = x"yes"; then
885 AC_DEFINE(_GLIBCXX98_USE_C99_MATH, 1,
886 [Define if C99 functions or macros in <math.h> should be imported
887 in <cmath> in namespace std for C++98.])
890 # Check for the existence of <complex.h> complex math functions.
891 # This is necessary even though libstdc++ uses the builtin versions
892 # of these functions, because if the builtin cannot be used, a reference
893 # to the library function is emitted.
894 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
895 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
896 if test x"$ac_has_complex_h" = x"yes"; then
897 AC_CACHE_CHECK([for ISO C99 support in <complex.h> for C++98],
898 glibcxx_cv_c99_complex_cxx98, [
899 GCC_TRY_COMPILE_OR_LINK(
900 [#include <complex.h>
901 typedef __complex__ float float_type;
902 typedef __complex__ double double_type;
903 typedef __complex__ long double ld_type;
904 volatile float_type tmpf;
905 volatile double_type tmpd;
906 volatile ld_type tmpld;
909 volatile long double ld;],
921 tmpf = cpowf(tmpf, tmpf);
934 tmpd = cpow(tmpd, tmpd);
938 tmpld = ccosl(tmpld);
939 tmpld = ccoshl(tmpld);
940 tmpld = cexpl(tmpld);
941 tmpld = clogl(tmpld);
942 tmpld = csinl(tmpld);
943 tmpld = csinhl(tmpld);
944 tmpld = csqrtl(tmpld);
945 tmpld = ctanl(tmpld);
946 tmpld = ctanhl(tmpld);
947 tmpld = cpowl(tmpld, tmpld);
948 tmpld = cprojl(tmpld);
949 ], [glibcxx_cv_c99_complex_cxx98=yes], [glibcxx_cv_c99_complex_cxx98=no])
952 if test x"$glibcxx_cv_c99_complex_cxx98" = x"yes"; then
953 AC_DEFINE(_GLIBCXX98_USE_C99_COMPLEX, 1,
954 [Define if C99 functions in <complex.h> should be used in
955 <complex> for C++98. Using compiler builtins for these functions
956 requires corresponding C99 library functions to be present.])
959 # Check for the existence in <stdio.h> of vscanf, et. al.
960 AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++98],
961 glibcxx_cv_c99_stdio_cxx98, [
962 GCC_TRY_COMPILE_OR_LINK(
965 void foo(char* fmt, ...)
967 va_list args; va_start(args, fmt);
968 vfscanf(stderr, "%i", args);
970 vsnprintf(fmt, 0, "%i", args);
971 vsscanf(fmt, "%i", args);
972 snprintf(fmt, 0, "%i");
974 [glibcxx_cv_c99_stdio_cxx98=yes], [glibcxx_cv_c99_stdio_cxx98=no])
976 if test x"$glibcxx_cv_c99_stdio_cxx98" = x"yes"; then
977 AC_DEFINE(_GLIBCXX98_USE_C99_STDIO, 1,
978 [Define if C99 functions or macros in <stdio.h> should be imported
979 in <cstdio> in namespace std for C++98.])
982 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
983 AC_CACHE_CHECK([for ISO C99 support in <stdlib.h> for C++98],
984 glibcxx_cv_c99_stdlib_cxx98, [
985 GCC_TRY_COMPILE_OR_LINK(
988 volatile long double ld;
989 volatile unsigned long long ll;
992 f = strtof("gnu", &tmp);
993 ld = strtold("gnu", &tmp);
994 ll = strtoll("gnu", &tmp, 10);
995 ll = strtoull("gnu", &tmp, 10);
997 mydivt = lldiv(10,1);
1002 ], [glibcxx_cv_c99_stdlib_cxx98=yes], [glibcxx_cv_c99_stdlib_cxx98=no])
1004 if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
1005 AC_DEFINE(_GLIBCXX98_USE_C99_STDLIB, 1,
1006 [Define if C99 functions or macros in <stdlib.h> should be imported
1007 in <cstdlib> in namespace std for C++98.])
1010 # Check for the existence in <wchar.h> of wcstold, etc.
1011 if test x"$ac_has_wchar_h" = xyes &&
1012 test x"$ac_has_wctype_h" = xyes; then
1013 AC_CACHE_CHECK([for ISO C99 support in <wchar.h> for C++98],
1014 glibcxx_cv_c99_wchar_cxx98, [
1015 AC_TRY_COMPILE([#include <wchar.h>
1022 ], [], [glibcxx_cv_c99_wchar_cxx98=yes], [glibcxx_cv_c99_wchar_cxx98=no])
1025 # Checks for wide character functions that may not be present.
1026 # Injection of these is wrapped with guard macros.
1027 # NB: only put functions here, instead of immediately above, if
1028 # absolutely necessary.
1029 AC_TRY_COMPILE([#include <wchar.h>
1030 namespace test { using ::vfwscanf; }], [],
1031 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1033 AC_TRY_COMPILE([#include <wchar.h>
1034 namespace test { using ::vswscanf; }], [],
1035 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1037 AC_TRY_COMPILE([#include <wchar.h>
1038 namespace test { using ::vwscanf; }], [],
1039 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1041 AC_TRY_COMPILE([#include <wchar.h>
1042 namespace test { using ::wcstof; }], [],
1043 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1045 AC_TRY_COMPILE([#include <wctype.h>],
1046 [wint_t t; int i = iswblank(t);],
1047 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1049 if test x"$glibcxx_cv_c99_wchar_cxx98" = x"yes"; then
1050 AC_DEFINE(_GLIBCXX98_USE_C99_WCHAR, 1,
1051 [Define if C99 functions or macros in <wchar.h> should be imported
1052 in <cwchar> in namespace std for C++98.])
1056 # Option parsed, now set things appropriately.
1057 if test x"$glibcxx_cv_c99_math_cxx98" = x"no" ||
1058 test x"$glibcxx_cv_c99_complex_cxx98" = x"no" ||
1059 test x"$glibcxx_cv_c99_stdio_cxx98" = x"no" ||
1060 test x"$glibcxx_cv_c99_stdlib_cxx98" = x"no" ||
1061 test x"$glibcxx_cv_c99_wchar_cxx98" = x"no"; then
1064 AC_DEFINE(_GLIBCXX_USE_C99, 1,
1065 [Define if C99 functions or macros from <wchar.h>, <math.h>,
1066 <complex.h>, <stdio.h>, and <stdlib.h> can be used or exposed.])
1069 gcc_no_link="$ac_save_gcc_no_link"
1070 LIBS="$ac_save_LIBS"
1071 CXXFLAGS="$ac_save_CXXFLAGS"
1077 # Use -std=c++11 and test again for C99 library feature in C++11 mode.
1078 # For the reasons given above we use -std=c++11 not -std=gnu++11.
1079 ac_save_CXXFLAGS="$CXXFLAGS"
1080 CXXFLAGS="$CXXFLAGS -std=c++11"
1081 ac_save_LIBS="$LIBS"
1082 ac_save_gcc_no_link="$gcc_no_link"
1084 if test x$gcc_no_link != xyes; then
1085 # Use -fno-exceptions to that the C driver can link these tests without
1086 # hitting undefined references to personality routines.
1087 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1088 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
1089 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
1094 # Check for the existence of <math.h> functions used if C99 is enabled.
1095 AC_CACHE_CHECK([for ISO C99 support in <math.h> for C++11],
1096 glibcxx_cv_c99_math_cxx11, [
1097 GCC_TRY_COMPILE_OR_LINK(
1099 volatile double d1, d2;
1101 [i = fpclassify(d1);
1107 i = isgreater(d1, d2);
1108 i = isgreaterequal(d1, d2);
1110 i = islessequal(d1, d2);
1111 i = islessgreater(d1, d2);
1112 i = islessgreater(d1, d2);
1113 i = isunordered(d1, d2);
1114 ], [glibcxx_cv_c99_math_cxx11=yes], [glibcxx_cv_c99_math_cxx11=no])
1116 if test x"$glibcxx_cv_c99_math_cxx11" = x"yes"; then
1117 AC_DEFINE(_GLIBCXX11_USE_C99_MATH, 1,
1118 [Define if C99 functions or macros in <math.h> should be imported
1119 in <cmath> in namespace std for C++11.])
1122 # Check for the existence of <complex.h> complex math functions.
1123 # This is necessary even though libstdc++ uses the builtin versions
1124 # of these functions, because if the builtin cannot be used, a reference
1125 # to the library function is emitted.
1126 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
1127 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1128 if test x"$ac_has_complex_h" = x"yes"; then
1129 AC_CACHE_CHECK([for ISO C99 support in <complex.h> for C++11],
1130 glibcxx_cv_c99_complex_cxx11, [
1131 GCC_TRY_COMPILE_OR_LINK(
1132 [#include <complex.h>
1133 typedef __complex__ float float_type;
1134 typedef __complex__ double double_type;
1135 typedef __complex__ long double ld_type;
1136 volatile float_type tmpf;
1137 volatile double_type tmpd;
1138 volatile ld_type tmpld;
1141 volatile long double ld;],
1145 tmpf = ccoshf(tmpf);
1149 tmpf = csinhf(tmpf);
1150 tmpf = csqrtf(tmpf);
1152 tmpf = ctanhf(tmpf);
1153 tmpf = cpowf(tmpf, tmpf);
1154 tmpf = cprojf(tmpf);
1166 tmpd = cpow(tmpd, tmpd);
1170 tmpld = ccosl(tmpld);
1171 tmpld = ccoshl(tmpld);
1172 tmpld = cexpl(tmpld);
1173 tmpld = clogl(tmpld);
1174 tmpld = csinl(tmpld);
1175 tmpld = csinhl(tmpld);
1176 tmpld = csqrtl(tmpld);
1177 tmpld = ctanl(tmpld);
1178 tmpld = ctanhl(tmpld);
1179 tmpld = cpowl(tmpld, tmpld);
1180 tmpld = cprojl(tmpld);
1181 ], [glibcxx_cv_c99_complex_cxx11=yes], [glibcxx_cv_c99_complex_cxx11=no])
1184 if test x"$glibcxx_cv_c99_complex_cxx11" = x"yes"; then
1185 AC_DEFINE(_GLIBCXX11_USE_C99_COMPLEX, 1,
1186 [Define if C99 functions in <complex.h> should be used in
1187 <complex> for C++11. Using compiler builtins for these functions
1188 requires corresponding C99 library functions to be present.])
1191 # Check for the existence in <stdio.h> of vscanf, et. al.
1192 AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++11],
1193 glibcxx_cv_c99_stdio_cxx11, [
1194 GCC_TRY_COMPILE_OR_LINK(
1197 void foo(char* fmt, ...)
1199 va_list args; va_start(args, fmt);
1200 vfscanf(stderr, "%i", args);
1202 vsnprintf(fmt, 0, "%i", args);
1203 vsscanf(fmt, "%i", args);
1204 snprintf(fmt, 0, "%i");
1206 [glibcxx_cv_c99_stdio_cxx11=yes], [glibcxx_cv_c99_stdio_cxx11=no])
1208 if test x"$glibcxx_cv_c99_stdio_cxx11" = x"yes"; then
1209 AC_DEFINE(_GLIBCXX11_USE_C99_STDIO, 1,
1210 [Define if C99 functions or macros in <stdio.h> should be imported
1211 in <cstdio> in namespace std for C++11.])
1214 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
1215 AC_CACHE_CHECK([for ISO C99 support in <stdlib.h> for C++11],
1216 glibcxx_cv_c99_stdlib_cxx11, [
1217 GCC_TRY_COMPILE_OR_LINK(
1218 [#include <stdlib.h>
1220 volatile long double ld;
1221 volatile unsigned long long ll;
1224 f = strtof("gnu", &tmp);
1225 ld = strtold("gnu", &tmp);
1226 ll = strtoll("gnu", &tmp, 10);
1227 ll = strtoull("gnu", &tmp, 10);
1229 mydivt = lldiv(10,1);
1234 ], [glibcxx_cv_c99_stdlib_cxx11=yes], [glibcxx_cv_c99_stdlib_cxx11=no])
1236 if test x"$glibcxx_cv_c99_stdlib_cxx11" = x"yes"; then
1237 AC_DEFINE(_GLIBCXX11_USE_C99_STDLIB, 1,
1238 [Define if C99 functions or macros in <stdlib.h> should be imported
1239 in <cstdlib> in namespace std for C++11.])
1242 # Check for the existence in <wchar.h> of wcstold, etc.
1243 if test x"$ac_has_wchar_h" = xyes &&
1244 test x"$ac_has_wctype_h" = xyes; then
1245 AC_CACHE_CHECK([for ISO C99 support in <wchar.h> for C++11],
1246 glibcxx_cv_c99_wchar_cxx11, [
1247 AC_TRY_COMPILE([#include <wchar.h>
1254 ], [], [glibcxx_cv_c99_wchar_cxx11=yes], [glibcxx_cv_c99_wchar_cxx11=no])
1257 # Checks for wide character functions that may not be present.
1258 # Injection of these is wrapped with guard macros.
1259 # NB: only put functions here, instead of immediately above, if
1260 # absolutely necessary.
1261 AC_TRY_COMPILE([#include <wchar.h>
1262 namespace test { using ::vfwscanf; }], [],
1263 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1265 AC_TRY_COMPILE([#include <wchar.h>
1266 namespace test { using ::vswscanf; }], [],
1267 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1269 AC_TRY_COMPILE([#include <wchar.h>
1270 namespace test { using ::vwscanf; }], [],
1271 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1273 AC_TRY_COMPILE([#include <wchar.h>
1274 namespace test { using ::wcstof; }], [],
1275 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1277 AC_TRY_COMPILE([#include <wctype.h>],
1278 [wint_t t; int i = iswblank(t);],
1279 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1281 if test x"$glibcxx_cv_c99_wchar_cxx11" = x"yes"; then
1282 AC_DEFINE(_GLIBCXX11_USE_C99_WCHAR, 1,
1283 [Define if C99 functions or macros in <wchar.h> should be imported
1284 in <cwchar> in namespace std for C++11.])
1288 gcc_no_link="$ac_save_gcc_no_link"
1289 LIBS="$ac_save_LIBS"
1290 CXXFLAGS="$ac_save_CXXFLAGS"
1294 AC_MSG_CHECKING([for fully enabled ISO C99 support])
1295 AC_MSG_RESULT($enable_c99)
1300 dnl Check for clock_gettime, nanosleep and sched_yield, used in the
1301 dnl implementation of 20.11.7 [time.clock], and 30.3.2 [thread.thread.this]
1302 dnl in the C++11 standard.
1304 dnl --enable-libstdcxx-time
1305 dnl --enable-libstdcxx-time=yes
1306 dnl checks for the availability of monotonic and realtime clocks,
1307 dnl nanosleep and sched_yield in libc.
1308 dnl --enable-libstdcxx-time=rt
1309 dnl also searches (and, if needed, links) librt. Note that this is
1310 dnl not always desirable because, in glibc 2.16 and earlier, for
1311 dnl example, in turn it triggers the linking of libpthread too,
1312 dnl which activates locking,
1313 dnl a large overhead for single-thread programs.
1314 dnl --enable-libstdcxx-time=no
1315 dnl --disable-libstdcxx-time
1316 dnl disables the checks completely
1318 dnl N.B. Darwin provides nanosleep but doesn't support the whole POSIX
1319 dnl Timers option, so doesn't define _POSIX_TIMERS. Because the test
1320 dnl below fails Darwin unconditionally defines _GLIBCXX_USE_NANOSLEEP in
1321 dnl os_defines.h and also defines _GLIBCXX_USE_SCHED_YIELD.
1323 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
1325 GLIBCXX_ENABLE(libstdcxx-time,auto,[[[=KIND]]],
1326 [use KIND for check type],
1331 ac_save_CXXFLAGS="$CXXFLAGS"
1332 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1333 ac_save_LIBS="$LIBS"
1335 ac_has_clock_monotonic=no
1336 ac_has_clock_realtime=no
1338 ac_has_sched_yield=no
1340 if test x"$enable_libstdcxx_time" = x"auto"; then
1342 case "${target_os}" in
1344 ac_has_nanosleep=yes
1347 ac_has_nanosleep=yes
1348 ac_has_sched_yield=yes
1350 # VxWorks has nanosleep as soon as the kernel is configured with
1351 # INCLUDE_POSIX_TIMERS, which is normally/most-often the case.
1353 ac_has_nanosleep=yes
1355 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
1356 # Don't use link test for freestanding library, in case gcc_no_link=yes
1357 if test x"$is_hosted" = xyes; then
1358 # Versions of glibc before 2.17 needed -lrt for clock_gettime.
1359 AC_SEARCH_LIBS(clock_gettime, [rt])
1360 if test x"$ac_cv_search_clock_gettime" = x"none required"; then
1361 ac_has_clock_monotonic=yes
1362 ac_has_clock_realtime=yes
1365 ac_has_nanosleep=yes
1366 ac_has_sched_yield=yes
1368 freebsd*|netbsd*|dragonfly*|rtems*)
1369 ac_has_clock_monotonic=yes
1370 ac_has_clock_realtime=yes
1371 ac_has_nanosleep=yes
1372 ac_has_sched_yield=yes
1375 ac_has_clock_monotonic=yes
1376 ac_has_clock_realtime=yes
1377 ac_has_nanosleep=yes
1380 ac_has_clock_monotonic=yes
1381 ac_has_clock_realtime=yes
1382 ac_has_nanosleep=yes
1383 ac_has_sched_yield=yes
1386 ac_has_nanosleep=yes
1387 ac_has_sched_yield=yes
1390 elif test x"$enable_libstdcxx_time" != x"no"; then
1392 if test x"$enable_libstdcxx_time" = x"rt"; then
1393 AC_SEARCH_LIBS(clock_gettime, [rt])
1394 AC_SEARCH_LIBS(nanosleep, [rt])
1396 AC_CHECK_FUNC(clock_gettime)
1397 AC_CHECK_FUNC(nanosleep)
1400 case "$ac_cv_search_clock_gettime" in
1401 -l*) GLIBCXX_LIBS=$ac_cv_search_clock_gettime
1404 case "$ac_cv_search_nanosleep" in
1405 -l*) GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_nanosleep"
1409 AC_SEARCH_LIBS(sched_yield, [rt])
1411 case "$ac_cv_search_sched_yield" in
1413 if test x"$enable_libstdcxx_time" = x"rt"; then
1414 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1415 ac_has_sched_yield=yes
1419 ac_has_sched_yield=yes
1423 AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
1425 if test x"$ac_has_unistd_h" = x"yes"; then
1426 AC_MSG_CHECKING([for monotonic clock])
1428 [#include <unistd.h>
1431 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1434 clock_gettime(CLOCK_MONOTONIC, &tp);
1435 ], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
1437 AC_MSG_RESULT($ac_has_clock_monotonic)
1439 AC_MSG_CHECKING([for realtime clock])
1441 [#include <unistd.h>
1444 [#if _POSIX_TIMERS > 0
1447 clock_gettime(CLOCK_REALTIME, &tp);
1448 ], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
1450 AC_MSG_RESULT($ac_has_clock_realtime)
1452 AC_MSG_CHECKING([for nanosleep])
1454 [#include <unistd.h>
1457 [#if _POSIX_TIMERS > 0
1461 ], [ac_has_nanosleep=yes], [ac_has_nanosleep=no])
1463 AC_MSG_RESULT($ac_has_nanosleep)
1467 if test x"$ac_has_clock_monotonic" != x"yes"; then
1468 case ${target_os} in
1470 AC_MSG_CHECKING([for clock_gettime syscall])
1472 [#include <unistd.h>
1474 #include <sys/syscall.h>
1476 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1479 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp);
1480 syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);
1481 ], [ac_has_clock_gettime_syscall=yes], [ac_has_clock_gettime_syscall=no])
1482 AC_MSG_RESULT($ac_has_clock_gettime_syscall)
1483 if test x"$ac_has_clock_gettime_syscall" = x"yes"; then
1484 AC_DEFINE(_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL, 1,
1485 [Defined if clock_gettime syscall has monotonic and realtime clock support. ])
1486 ac_has_clock_monotonic=yes
1487 ac_has_clock_realtime=yes
1488 AC_MSG_CHECKING([for struct timespec that matches syscall])
1491 #include <sys/syscall.h>
1493 [#ifdef SYS_clock_gettime64
1494 #if SYS_clock_gettime64 != SYS_clock_gettime
1495 // We need to use SYS_clock_gettime and libc appears to
1496 // also know about the SYS_clock_gettime64 syscall.
1497 // Check that userspace doesn't use time64 version of timespec.
1498 static_assert(sizeof(timespec::tv_sec) == sizeof(long),
1499 "struct timespec must be compatible with SYS_clock_gettime");
1503 [ac_timespec_matches_syscall=yes],
1504 [ac_timespec_matches_syscall=no])
1505 AC_MSG_RESULT($ac_timespec_matches_syscall)
1506 if test x"$ac_timespec_matches_syscall" = no; then
1507 AC_MSG_ERROR([struct timespec is not compatible with SYS_clock_gettime, please report a bug to http://gcc.gnu.org/bugzilla])
1513 if test x"$ac_has_clock_monotonic" = x"yes"; then
1514 AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
1515 [ Defined if clock_gettime has monotonic clock support. ])
1518 if test x"$ac_has_clock_realtime" = x"yes"; then
1519 AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
1520 [ Defined if clock_gettime has realtime clock support. ])
1523 if test x"$ac_has_sched_yield" = x"yes"; then
1524 AC_DEFINE(_GLIBCXX_USE_SCHED_YIELD, 1,
1525 [ Defined if sched_yield is available. ])
1528 if test x"$ac_has_nanosleep" = x"yes"; then
1529 AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
1530 [ Defined if nanosleep is available. ])
1532 AC_MSG_CHECKING([for sleep])
1533 AC_TRY_COMPILE([#include <unistd.h>],
1535 [ac_has_sleep=yes],[ac_has_sleep=no])
1536 if test x"$ac_has_sleep" = x"yes"; then
1537 AC_DEFINE(HAVE_SLEEP,1, [Defined if sleep exists.])
1539 AC_MSG_RESULT($ac_has_sleep)
1540 AC_MSG_CHECKING([for usleep])
1541 AC_TRY_COMPILE([#include <unistd.h>],
1544 [ac_has_usleep=yes],[ac_has_usleep=no])
1545 if test x"$ac_has_usleep" = x"yes"; then
1546 AC_DEFINE(HAVE_USLEEP,1, [Defined if usleep exists.])
1548 AC_MSG_RESULT($ac_has_usleep)
1551 if test x"$ac_has_nanosleep$ac_has_sleep" = x"nono"; then
1553 AC_MSG_CHECKING([for Sleep])
1554 AC_TRY_COMPILE([#include <windows.h>],
1556 [ac_has_win32_sleep=yes],[ac_has_win32_sleep=no])
1557 if test x"$ac_has_win32_sleep" = x"yes"; then
1558 AC_DEFINE(HAVE_WIN32_SLEEP,1, [Defined if Sleep exists.])
1561 AC_MSG_RESULT($ac_has_win32_sleep)
1564 if test x"$ac_no_sleep" = x"yes"; then
1565 AC_DEFINE(NO_SLEEP,1, [Defined if no way to sleep is available.])
1568 AC_SUBST(GLIBCXX_LIBS)
1570 CXXFLAGS="$ac_save_CXXFLAGS"
1571 LIBS="$ac_save_LIBS"
1576 dnl Check for gettimeofday, used in the implementation of 20.11.7
1577 dnl [time.clock] in the C++11 standard.
1579 AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
1581 AC_MSG_CHECKING([for gettimeofday])
1585 ac_save_CXXFLAGS="$CXXFLAGS"
1586 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1588 ac_has_gettimeofday=no;
1589 AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
1590 if test x"$ac_has_sys_time_h" = x"yes"; then
1591 AC_MSG_CHECKING([for gettimeofday])
1592 GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
1593 [timeval tv; gettimeofday(&tv, 0);],
1594 [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
1596 AC_MSG_RESULT($ac_has_gettimeofday)
1599 if test x"$ac_has_gettimeofday" = x"yes"; then
1600 AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
1601 [ Defined if gettimeofday is available. ])
1604 CXXFLAGS="$ac_save_CXXFLAGS"
1609 dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
1610 dnl facilities in Chapter 8, "C compatibility".
1612 AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
1617 # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
1618 # undefined and fake C99 facilities may be spuriously enabled.
1619 ac_save_CXXFLAGS="$CXXFLAGS"
1620 CXXFLAGS="$CXXFLAGS -std=c++98"
1622 # Check for the existence of <complex.h> complex math functions used
1624 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1625 ac_c99_complex_tr1=no;
1626 if test x"$ac_has_complex_h" = x"yes"; then
1627 AC_MSG_CHECKING([for ISO C99 support to TR1 in <complex.h>])
1628 AC_TRY_COMPILE([#include <complex.h>],
1629 [typedef __complex__ float float_type; float_type tmpf;
1636 typedef __complex__ double double_type; double_type tmpd;
1643 typedef __complex__ long double ld_type; ld_type tmpld;
1650 ],[ac_c99_complex_tr1=yes], [ac_c99_complex_tr1=no])
1652 AC_MSG_RESULT($ac_c99_complex_tr1)
1653 if test x"$ac_c99_complex_tr1" = x"yes"; then
1654 AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_TR1, 1,
1655 [Define if C99 functions in <complex.h> should be used in
1656 <tr1/complex>. Using compiler builtins for these functions
1657 requires corresponding C99 library functions to be present.])
1660 # Check for the existence of <ctype.h> functions.
1661 AC_CACHE_CHECK([for ISO C99 support to TR1 in <ctype.h>],
1662 glibcxx_cv_c99_ctype_tr1, [
1663 AC_TRY_COMPILE([#include <ctype.h>],
1667 ],[glibcxx_cv_c99_ctype_tr1=yes],
1668 [glibcxx_cv_c99_ctype_tr1=no])
1670 if test x"$glibcxx_cv_c99_ctype_tr1" = x"yes"; then
1671 AC_DEFINE(_GLIBCXX_USE_C99_CTYPE_TR1, 1,
1672 [Define if C99 functions in <ctype.h> should be imported in
1673 <tr1/cctype> in namespace std::tr1.])
1676 # Check for the existence of <fenv.h> functions.
1677 AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no)
1679 if test x"$ac_has_fenv_h" = x"yes"; then
1680 AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>])
1681 AC_TRY_COMPILE([#include <fenv.h>],
1686 ret = feclearexcept(except);
1687 ret = fegetexceptflag(pflag, except);
1688 ret = feraiseexcept(except);
1689 ret = fesetexceptflag(pflag, except);
1690 ret = fetestexcept(except);
1692 ret = fesetround(mode);
1693 ret = fegetenv(penv);
1694 ret = feholdexcept(penv);
1695 ret = fesetenv(penv);
1696 ret = feupdateenv(penv);
1697 ],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no])
1698 AC_MSG_RESULT($ac_c99_fenv_tr1)
1700 if test x"$ac_c99_fenv_tr1" = x"yes"; then
1701 AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1,
1702 [Define if C99 functions in <fenv.h> should be imported in
1703 <tr1/cfenv> in namespace std::tr1.])
1706 # Check for the existence of <stdint.h> types.
1707 AC_CACHE_CHECK([for ISO C99 support to TR1 in <stdint.h>],
1708 glibcxx_cv_c99_stdint_tr1, [
1709 AC_TRY_COMPILE([#define __STDC_LIMIT_MACROS
1710 #define __STDC_CONSTANT_MACROS
1711 #include <stdint.h>],
1712 [typedef int8_t my_int8_t;
1713 my_int8_t i8 = INT8_MIN;
1715 typedef int16_t my_int16_t;
1716 my_int16_t i16 = INT16_MIN;
1718 typedef int32_t my_int32_t;
1719 my_int32_t i32 = INT32_MIN;
1721 typedef int64_t my_int64_t;
1722 my_int64_t i64 = INT64_MIN;
1724 typedef int_fast8_t my_int_fast8_t;
1725 my_int_fast8_t if8 = INT_FAST8_MIN;
1726 if8 = INT_FAST8_MAX;
1727 typedef int_fast16_t my_int_fast16_t;
1728 my_int_fast16_t if16 = INT_FAST16_MIN;
1729 if16 = INT_FAST16_MAX;
1730 typedef int_fast32_t my_int_fast32_t;
1731 my_int_fast32_t if32 = INT_FAST32_MIN;
1732 if32 = INT_FAST32_MAX;
1733 typedef int_fast64_t my_int_fast64_t;
1734 my_int_fast64_t if64 = INT_FAST64_MIN;
1735 if64 = INT_FAST64_MAX;
1736 typedef int_least8_t my_int_least8_t;
1737 my_int_least8_t il8 = INT_LEAST8_MIN;
1738 il8 = INT_LEAST8_MAX;
1739 typedef int_least16_t my_int_least16_t;
1740 my_int_least16_t il16 = INT_LEAST16_MIN;
1741 il16 = INT_LEAST16_MAX;
1742 typedef int_least32_t my_int_least32_t;
1743 my_int_least32_t il32 = INT_LEAST32_MIN;
1744 il32 = INT_LEAST32_MAX;
1745 typedef int_least64_t my_int_least64_t;
1746 my_int_least64_t il64 = INT_LEAST64_MIN;
1747 il64 = INT_LEAST64_MAX;
1748 typedef intmax_t my_intmax_t;
1749 my_intmax_t im = INTMAX_MAX;
1751 typedef intptr_t my_intptr_t;
1752 my_intptr_t ip = INTPTR_MAX;
1754 typedef uint8_t my_uint8_t;
1755 my_uint8_t ui8 = UINT8_MAX;
1757 typedef uint16_t my_uint16_t;
1758 my_uint16_t ui16 = UINT16_MAX;
1760 typedef uint32_t my_uint32_t;
1761 my_uint32_t ui32 = UINT32_MAX;
1763 typedef uint64_t my_uint64_t;
1764 my_uint64_t ui64 = UINT64_MAX;
1766 typedef uint_fast8_t my_uint_fast8_t;
1767 my_uint_fast8_t uif8 = UINT_FAST8_MAX;
1768 uif8 = UINT_FAST8_MAX;
1769 typedef uint_fast16_t my_uint_fast16_t;
1770 my_uint_fast16_t uif16 = UINT_FAST16_MAX;
1771 uif16 = UINT_FAST16_MAX;
1772 typedef uint_fast32_t my_uint_fast32_t;
1773 my_uint_fast32_t uif32 = UINT_FAST32_MAX;
1774 uif32 = UINT_FAST32_MAX;
1775 typedef uint_fast64_t my_uint_fast64_t;
1776 my_uint_fast64_t uif64 = UINT_FAST64_MAX;
1777 uif64 = UINT_FAST64_MAX;
1778 typedef uint_least8_t my_uint_least8_t;
1779 my_uint_least8_t uil8 = UINT_LEAST8_MAX;
1780 uil8 = UINT_LEAST8_MAX;
1781 typedef uint_least16_t my_uint_least16_t;
1782 my_uint_least16_t uil16 = UINT_LEAST16_MAX;
1783 uil16 = UINT_LEAST16_MAX;
1784 typedef uint_least32_t my_uint_least32_t;
1785 my_uint_least32_t uil32 = UINT_LEAST32_MAX;
1786 uil32 = UINT_LEAST32_MAX;
1787 typedef uint_least64_t my_uint_least64_t;
1788 my_uint_least64_t uil64 = UINT_LEAST64_MAX;
1789 uil64 = UINT_LEAST64_MAX;
1790 typedef uintmax_t my_uintmax_t;
1791 my_uintmax_t uim = UINTMAX_MAX;
1793 typedef uintptr_t my_uintptr_t;
1794 my_uintptr_t uip = UINTPTR_MAX;
1796 ],[glibcxx_cv_c99_stdint_tr1=yes],
1797 [glibcxx_cv_c99_stdint_tr1=no])
1799 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1800 AC_DEFINE(_GLIBCXX_USE_C99_STDINT_TR1, 1,
1801 [Define if C99 types in <stdint.h> should be imported in
1802 <tr1/cstdint> in namespace std::tr1.])
1805 # Check for the existence of <math.h> functions.
1806 AC_CACHE_CHECK([for ISO C99 support to TR1 in <math.h>],
1807 glibcxx_cv_c99_math_tr1, [
1808 AC_TRY_COMPILE([#include <math.h>],
1809 [typedef double_t my_double_t;
1810 typedef float_t my_float_t;
1824 copysignf(0.0f, 0.0f);
1825 copysignl(0.0l, 0.0l);
1842 fmaf(0.0f, 0.0f, 0.0f);
1843 fmal(0.0l, 0.0l, 0.0l);
1859 #ifndef __APPLE__ /* see below */
1888 nextafter(0.0, 0.0);
1889 nextafterf(0.0f, 0.0f);
1890 nextafterl(0.0l, 0.0l);
1891 nexttoward(0.0, 0.0);
1892 nexttowardf(0.0f, 0.0f);
1893 nexttowardl(0.0l, 0.0l);
1894 remainder(0.0, 0.0);
1895 remainderf(0.0f, 0.0f);
1896 remainderl(0.0l, 0.0l);
1897 remquo(0.0, 0.0, 0);
1898 remquof(0.0f, 0.0f, 0);
1899 remquol(0.0l, 0.0l, 0);
1918 ],[glibcxx_cv_c99_math_tr1=yes], [glibcxx_cv_c99_math_tr1=no])
1920 if test x"$glibcxx_cv_c99_math_tr1" = x"yes"; then
1921 AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
1922 [Define if C99 functions or macros in <math.h> should be imported
1923 in <tr1/cmath> in namespace std::tr1.])
1925 case "${target_os}" in
1927 AC_CACHE_CHECK([for ISO C99 rounding functions in <math.h>],
1928 glibcxx_cv_c99_math_llround, [
1929 AC_TRY_COMPILE([#include <math.h>],
1937 [glibcxx_cv_c99_math_llround=yes],
1938 [glibcxx_cv_c99_math_llround=no])
1942 if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
1943 AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
1944 [Define if C99 llrint and llround functions are missing from <math.h>.])
1948 # Check for the existence of <inttypes.h> functions (NB: doesn't make
1949 # sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1950 ac_c99_inttypes_tr1=no;
1951 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1952 AC_MSG_CHECKING([for ISO C99 support to TR1 in <inttypes.h>])
1953 AC_TRY_COMPILE([#include <inttypes.h>],
1954 [intmax_t i, numer, denom, base;
1957 intmax_t ret = imaxabs(i);
1958 imaxdiv_t dret = imaxdiv(numer, denom);
1959 ret = strtoimax(s, endptr, base);
1960 uintmax_t uret = strtoumax(s, endptr, base);
1961 ],[ac_c99_inttypes_tr1=yes], [ac_c99_inttypes_tr1=no])
1962 AC_MSG_RESULT($ac_c99_inttypes_tr1)
1964 if test x"$ac_c99_inttypes_tr1" = x"yes"; then
1965 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_TR1, 1,
1966 [Define if C99 functions in <inttypes.h> should be imported in
1967 <tr1/cinttypes> in namespace std::tr1.])
1970 # Check for the existence of wchar_t <inttypes.h> functions (NB: doesn't
1971 # make sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1972 ac_c99_inttypes_wchar_t_tr1=no;
1973 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1974 AC_MSG_CHECKING([for wchar_t ISO C99 support to TR1 in <inttypes.h>])
1975 AC_TRY_COMPILE([#include <inttypes.h>],
1979 intmax_t ret = wcstoimax(s, endptr, base);
1980 uintmax_t uret = wcstoumax(s, endptr, base);
1981 ],[ac_c99_inttypes_wchar_t_tr1=yes],
1982 [ac_c99_inttypes_wchar_t_tr1=no])
1983 AC_MSG_RESULT($ac_c99_inttypes_wchar_t_tr1)
1985 if test x"$ac_c99_inttypes_wchar_t_tr1" = x"yes"; then
1986 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1, 1,
1987 [Define if wchar_t C99 functions in <inttypes.h> should be
1988 imported in <tr1/cinttypes> in namespace std::tr1.])
1991 # Check for the existence of the <stdbool.h> header.
1992 AC_CHECK_HEADERS(stdbool.h)
1994 # Check for the existence of the <stdalign.h> header.
1995 AC_CHECK_HEADERS(stdalign.h)
1997 CXXFLAGS="$ac_save_CXXFLAGS"
2002 dnl Check for uchar.h and usability.
2004 AC_DEFUN([GLIBCXX_CHECK_UCHAR_H], [
2007 AC_CHECK_HEADERS(uchar.h, ac_has_uchar_h=yes, ac_has_uchar_h=no)
2011 ac_save_CXXFLAGS="$CXXFLAGS"
2012 CXXFLAGS="$CXXFLAGS -std=c++11"
2014 if test x"$ac_has_uchar_h" = x"yes"; then
2015 AC_MSG_CHECKING([for ISO C11 support for <uchar.h>])
2016 AC_TRY_COMPILE([#include <uchar.h>
2017 #ifdef __STDC_UTF_16__
2018 long i = __STDC_UTF_16__;
2020 #ifdef __STDC_UTF_32__
2021 long j = __STDC_UTF_32__;
2031 [], [ac_c11_uchar_cxx11=yes], [ac_c11_uchar_cxx11=no])
2032 AC_MSG_RESULT($ac_c11_uchar_cxx11)
2034 ac_c11_uchar_cxx11=no
2036 if test x"$ac_c11_uchar_cxx11" = x"yes"; then
2037 AC_DEFINE(_GLIBCXX_USE_C11_UCHAR_CXX11, 1,
2038 [Define if C11 functions in <uchar.h> should be imported into
2039 namespace std in <cuchar>.])
2042 CXXFLAGS="$ac_save_CXXFLAGS"
2048 dnl Check whether "/dev/random" and "/dev/urandom" are available for
2049 dnl class std::random_device from C++ 2011 [rand.device], and
2050 dnl random_device of "TR1" (Chapter 5.1, "Random number generation").
2052 AC_DEFUN([GLIBCXX_CHECK_DEV_RANDOM], [
2054 AC_CACHE_CHECK([for "/dev/random" and "/dev/urandom" for std::random_device],
2055 glibcxx_cv_dev_random, [
2056 if test -r /dev/random && test -r /dev/urandom; then
2057 ## For MSys environment the test above is detected as false-positive
2058 ## on mingw-targets. So disable it explicitly for them.
2059 case ${target_os} in
2060 *mingw*) glibcxx_cv_dev_random=no ;;
2061 *) glibcxx_cv_dev_random=yes ;;
2064 glibcxx_cv_dev_random=no;
2068 if test x"$glibcxx_cv_dev_random" = x"yes"; then
2069 AC_DEFINE(_GLIBCXX_USE_DEV_RANDOM, 1,
2070 [Define if /dev/random and /dev/urandom are available for
2071 std::random_device.])
2072 AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1, 1,
2073 [Define if /dev/random and /dev/urandom are available for
2074 the random_device of TR1 (Chapter 5.1).])
2080 dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
2082 AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
2084 AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
2085 AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
2086 [#include <stdio.h>],
2087 [AC_MSG_ERROR([computing EOF failed])])
2089 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_EOF, $glibcxx_cv_stdio_eof,
2090 [Define to the value of the EOF integer constant.])
2092 AC_CACHE_CHECK([for the value of SEEK_CUR], glibcxx_cv_stdio_seek_cur, [
2093 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_cur], [[SEEK_CUR]],
2094 [#include <stdio.h>],
2095 [AC_MSG_ERROR([computing SEEK_CUR failed])])
2097 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_CUR, $glibcxx_cv_stdio_seek_cur,
2098 [Define to the value of the SEEK_CUR integer constant.])
2100 AC_CACHE_CHECK([for the value of SEEK_END], glibcxx_cv_stdio_seek_end, [
2101 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_end], [[SEEK_END]],
2102 [#include <stdio.h>],
2103 [AC_MSG_ERROR([computing SEEK_END failed])])
2105 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
2106 [Define to the value of the SEEK_END integer constant.])
2110 dnl Check whether required C++ overloads are present in <stdio.h>.
2112 AC_DEFUN([GLIBCXX_CHECK_STDIO_PROTO], [
2116 # Use C++11 because a conforming <stdio.h> won't define gets for C++14,
2117 # and we don't need a declaration for C++14 anyway.
2118 ac_save_CXXFLAGS="$CXXFLAGS"
2119 CXXFLAGS="$CXXFLAGS -std=gnu++11"
2121 AC_CACHE_CHECK([for gets declaration], glibcxx_cv_gets, [
2122 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2129 [glibcxx_cv_gets=yes],
2130 [glibcxx_cv_gets=no]
2133 if test $glibcxx_cv_gets = yes; then
2134 AC_DEFINE(HAVE_GETS, 1, [Define if gets is available in <stdio.h> before C++14.])
2137 CXXFLAGS="$ac_save_CXXFLAGS"
2142 dnl Check whether required C++11 overloads for floating point and integral
2143 dnl types are present in <math.h>.
2145 AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
2149 ac_save_CXXFLAGS="$CXXFLAGS"
2150 CXXFLAGS="$CXXFLAGS -std=c++11"
2154 # Solaris 12 Build 86, Solaris 11.3 SRU 3.6, and Solaris 10 Patch
2155 # 11996[67]-02 introduced the C++11 <math.h> floating point overloads.
2156 AC_CACHE_CHECK([for C++11 <math.h> floating point overloads],
2157 glibcxx_cv_math11_fp_overload, [
2158 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2162 inline bool isfinite(float __x)
2163 { return __builtin_isfinite(__x); }
2166 [glibcxx_cv_math11_fp_overload=no],
2167 [glibcxx_cv_math11_fp_overload=yes]
2170 # autoheader cannot handle indented templates.
2171 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_FP],
2172 [/* Define if all C++11 floating point overloads are available in <math.h>. */
2173 #if __cplusplus >= 201103L
2174 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
2177 if test $glibcxx_cv_math11_fp_overload = yes; then
2178 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_FP)
2181 # Solaris 12 Build 90, Solaris 11.3 SRU 5.6, and Solaris 10 Patch
2182 # 11996[67]-02 introduced the C++11 <math.h> integral type overloads.
2183 AC_CACHE_CHECK([for C++11 <math.h> integral type overloads],
2184 glibcxx_cv_math11_int_overload, [
2185 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2188 template<typename _Tp>
2189 struct __is_integer;
2191 struct __is_integer<int>
2193 enum { __value = 1 };
2196 namespace __gnu_cxx {
2197 template<bool, typename>
2199 template<typename _Tp>
2200 struct __enable_if<true, _Tp>
2201 { typedef _Tp __type; };
2204 template<typename _Tp>
2205 constexpr typename __gnu_cxx::__enable_if
2206 <__is_integer<_Tp>::__value, double>::__type
2208 { return __builtin_log2(__x); }
2214 return std::log2(i);
2217 [glibcxx_cv_math11_int_overload=no],
2218 [glibcxx_cv_math11_int_overload=yes]
2221 # autoheader cannot handle indented templates.
2222 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_INT],
2223 [/* Define if all C++11 integral type overloads are available in <math.h>. */
2224 #if __cplusplus >= 201103L
2225 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
2228 if test $glibcxx_cv_math11_int_overload = yes; then
2229 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_INT)
2233 # If <math.h> defines the obsolete isinf(double) and isnan(double)
2234 # functions (instead of or as well as the C99 generic macros) then we
2235 # can't define std::isinf(double) and std::isnan(double) in <cmath>
2236 # and must use the ones from <math.h> instead.
2237 AC_CACHE_CHECK([for obsolete isinf function in <math.h>],
2238 glibcxx_cv_obsolete_isinf, [
2239 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2240 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2246 bool isinf(long double);
2249 bool b = isinf(0.0);
2251 [glibcxx_cv_obsolete_isinf=yes],
2252 [glibcxx_cv_obsolete_isinf=no]
2254 if test $glibcxx_cv_obsolete_isinf = yes; then
2255 AC_DEFINE(HAVE_OBSOLETE_ISINF, 1,
2256 [Define if <math.h> defines obsolete isinf function.])
2259 AC_CACHE_CHECK([for obsolete isnan function in <math.h>],
2260 glibcxx_cv_obsolete_isnan, [
2261 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2262 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2268 bool isnan(long double);
2271 bool b = isnan(0.0);
2273 [glibcxx_cv_obsolete_isnan=yes],
2274 [glibcxx_cv_obsolete_isnan=no]
2276 if test $glibcxx_cv_obsolete_isnan = yes; then
2277 AC_DEFINE(HAVE_OBSOLETE_ISNAN, 1,
2278 [Define if <math.h> defines obsolete isnan function.])
2283 CXXFLAGS="$ac_save_CXXFLAGS"
2288 dnl Check for what type of C headers to use.
2290 dnl --enable-cheaders= [does stuff].
2291 dnl --disable-cheaders [does not do anything, really].
2292 dnl + Usage: GLIBCXX_ENABLE_CHEADERS[(DEFAULT)]
2293 dnl Where DEFAULT is either 'c' or 'c_global' or 'c_std'.
2295 dnl To use the obsolete 'c_std' headers use --enable-cheaders-obsolete as
2296 dnl well as --enable-cheaders=c_std, otherwise configure will fail.
2298 AC_DEFUN([GLIBCXX_ENABLE_CHEADERS], [
2299 GLIBCXX_ENABLE(cheaders-obsolete,no,,
2300 [allow use of obsolete "C" headers for g++])
2301 GLIBCXX_ENABLE(cheaders,$1,[[[=KIND]]],
2302 [construct "C" headers for g++], [permit c|c_global|c_std])
2303 AC_MSG_NOTICE("C" header strategy set to $enable_cheaders)
2304 if test $enable_cheaders = c_std ; then
2305 AC_MSG_WARN([the --enable-cheaders=c_std configuration is obsolete, c_global should be used instead])
2306 AC_MSG_WARN([if you are unable to use c_global please report a bug or inform libstdc++@gcc.gnu.org])
2307 if test $enable_cheaders_obsolete != yes ; then
2308 AC_MSG_ERROR(use --enable-cheaders-obsolete to use c_std "C" headers)
2312 C_INCLUDE_DIR='${glibcxx_srcdir}/include/'$enable_cheaders
2314 # Allow overrides to configure.host here.
2315 if test $enable_cheaders = c_global; then
2319 AC_SUBST(C_INCLUDE_DIR)
2320 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C, test $enable_cheaders = c)
2321 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_STD, test $enable_cheaders = c_std)
2322 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_GLOBAL, test $enable_cheaders = c_global)
2323 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_COMPATIBILITY, test $c_compatibility = yes)
2328 dnl Check for which locale library to use. The choice is mapped to
2329 dnl a subdirectory of config/locale.
2331 dnl Default is generic.
2333 AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
2334 GLIBCXX_ENABLE(clocale,auto,[[[=MODEL]]],
2335 [use MODEL for target locale package],
2336 [permit generic|gnu|ieee_1003.1-2001|newlib|yes|no|auto])
2338 # Deal with gettext issues. Default to not using it (=no) until we detect
2339 # support for it later. Let the user turn it off via --e/d, but let that
2340 # default to on for easier handling.
2343 AC_HELP_STRING([--enable-nls],[use Native Language Support (default)]),
2347 # Either a known package, or "auto"
2348 if test $enable_clocale = no || test $enable_clocale = yes; then
2351 enable_clocale_flag=$enable_clocale
2353 # Probe for locale model to use if none specified.
2354 # Default to "generic".
2355 if test $enable_clocale_flag = auto; then
2356 case ${target_os} in
2357 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2358 enable_clocale_flag=gnu
2361 enable_clocale_flag=darwin
2364 enable_clocale_flag=vxworks
2366 dragonfly* | freebsd*)
2367 enable_clocale_flag=dragonfly
2370 enable_clocale_flag=newlib
2373 if test x"$with_newlib" = x"yes"; then
2374 enable_clocale_flag=newlib
2376 enable_clocale_flag=generic
2382 # Sanity check model, and test for special functionality.
2383 if test $enable_clocale_flag = gnu; then
2384 AC_EGREP_CPP([_GLIBCXX_ok], [
2385 #include <features.h>
2386 #if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined(__UCLIBC__)
2389 ], enable_clocale_flag=gnu, enable_clocale_flag=generic)
2391 # Set it to scream when it hurts.
2392 ac_save_CFLAGS="$CFLAGS"
2393 CFLAGS="-Wimplicit-function-declaration -Werror"
2395 # Use strxfrm_l if available.
2396 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2398 #include <locale.h>],
2399 [char s[128]; __locale_t loc; strxfrm_l(s, "C", 5, loc);],
2400 AC_DEFINE(HAVE_STRXFRM_L, 1,
2401 [Define if strxfrm_l is available in <string.h>.]),)
2403 # Use strerror_l if available.
2404 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2406 #include <locale.h>],
2407 [__locale_t loc; strerror_l(5, loc);],
2408 AC_DEFINE(HAVE_STRERROR_L, 1,
2409 [Define if strerror_l is available in <string.h>.]),)
2411 CFLAGS="$ac_save_CFLAGS"
2414 # Perhaps use strerror_r if available, and strerror_l isn't.
2415 ac_save_CFLAGS="$CFLAGS"
2416 CFLAGS="-Wimplicit-function-declaration -Werror"
2417 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2419 #include <locale.h>],
2420 [char s[128]; strerror_r(5, s, 128);],
2421 AC_DEFINE(HAVE_STRERROR_R, 1,
2422 [Define if strerror_r is available in <string.h>.]),)
2423 CFLAGS="$ac_save_CFLAGS"
2425 # Set configure bits for specified locale package
2426 AC_MSG_CHECKING([for C locale to use])
2427 case ${enable_clocale_flag} in
2429 AC_MSG_RESULT(generic)
2431 CLOCALE_H=config/locale/generic/c_locale.h
2432 CLOCALE_CC=config/locale/generic/c_locale.cc
2433 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2434 CCOLLATE_CC=config/locale/generic/collate_members.cc
2435 CCTYPE_CC=config/locale/generic/ctype_members.cc
2436 CMESSAGES_H=config/locale/generic/messages_members.h
2437 CMESSAGES_CC=config/locale/generic/messages_members.cc
2438 CMONEY_CC=config/locale/generic/monetary_members.cc
2439 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2440 CTIME_H=config/locale/generic/time_members.h
2441 CTIME_CC=config/locale/generic/time_members.cc
2442 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2445 AC_MSG_RESULT(darwin)
2447 CLOCALE_H=config/locale/generic/c_locale.h
2448 CLOCALE_CC=config/locale/generic/c_locale.cc
2449 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2450 CCOLLATE_CC=config/locale/generic/collate_members.cc
2451 CCTYPE_CC=config/locale/darwin/ctype_members.cc
2452 CMESSAGES_H=config/locale/generic/messages_members.h
2453 CMESSAGES_CC=config/locale/generic/messages_members.cc
2454 CMONEY_CC=config/locale/generic/monetary_members.cc
2455 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2456 CTIME_H=config/locale/generic/time_members.h
2457 CTIME_CC=config/locale/generic/time_members.cc
2458 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2461 AC_MSG_RESULT(vxworks)
2463 CLOCALE_H=config/locale/generic/c_locale.h
2464 CLOCALE_CC=config/locale/generic/c_locale.cc
2465 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2466 CCOLLATE_CC=config/locale/generic/collate_members.cc
2467 CCTYPE_CC=config/locale/vxworks/ctype_members.cc
2468 CMESSAGES_H=config/locale/generic/messages_members.h
2469 CMESSAGES_CC=config/locale/generic/messages_members.cc
2470 CMONEY_CC=config/locale/generic/monetary_members.cc
2471 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2472 CTIME_H=config/locale/generic/time_members.h
2473 CTIME_CC=config/locale/generic/time_members.cc
2474 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2477 AC_MSG_RESULT(dragonfly or freebsd)
2479 CLOCALE_H=config/locale/dragonfly/c_locale.h
2480 CLOCALE_CC=config/locale/dragonfly/c_locale.cc
2481 CCODECVT_CC=config/locale/dragonfly/codecvt_members.cc
2482 CCOLLATE_CC=config/locale/dragonfly/collate_members.cc
2483 CCTYPE_CC=config/locale/dragonfly/ctype_members.cc
2484 CMESSAGES_H=config/locale/generic/messages_members.h
2485 CMESSAGES_CC=config/locale/generic/messages_members.cc
2486 CMONEY_CC=config/locale/dragonfly/monetary_members.cc
2487 CNUMERIC_CC=config/locale/dragonfly/numeric_members.cc
2488 CTIME_H=config/locale/dragonfly/time_members.h
2489 CTIME_CC=config/locale/dragonfly/time_members.cc
2490 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2496 # Declare intention to use gettext, and add support for specific
2498 # For some reason, ALL_LINGUAS has to be before AM-GNU-GETTEXT
2501 # Don't call AM-GNU-GETTEXT here. Instead, assume glibc.
2502 AC_CHECK_PROG(check_msgfmt, msgfmt, yes, no)
2503 if test x"$check_msgfmt" = x"yes" && test x"$enable_nls" = x"yes"; then
2506 # Export the build objects.
2507 for ling in $ALL_LINGUAS; do \
2508 glibcxx_MOFILES="$glibcxx_MOFILES $ling.mo"; \
2509 glibcxx_POFILES="$glibcxx_POFILES $ling.po"; \
2511 AC_SUBST(glibcxx_MOFILES)
2512 AC_SUBST(glibcxx_POFILES)
2514 CLOCALE_H=config/locale/gnu/c_locale.h
2515 CLOCALE_CC=config/locale/gnu/c_locale.cc
2516 CCODECVT_CC=config/locale/gnu/codecvt_members.cc
2517 CCOLLATE_CC=config/locale/gnu/collate_members.cc
2518 CCTYPE_CC=config/locale/gnu/ctype_members.cc
2519 CMESSAGES_H=config/locale/gnu/messages_members.h
2520 CMESSAGES_CC=config/locale/gnu/messages_members.cc
2521 CMONEY_CC=config/locale/gnu/monetary_members.cc
2522 CNUMERIC_CC=config/locale/gnu/numeric_members.cc
2523 CTIME_H=config/locale/gnu/time_members.h
2524 CTIME_CC=config/locale/gnu/time_members.cc
2525 CLOCALE_INTERNAL_H=config/locale/gnu/c++locale_internal.h
2528 AC_MSG_RESULT(IEEE 1003.1)
2530 CLOCALE_H=config/locale/ieee_1003.1-2001/c_locale.h
2531 CLOCALE_CC=config/locale/ieee_1003.1-2001/c_locale.cc
2532 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2533 CCOLLATE_CC=config/locale/generic/collate_members.cc
2534 CCTYPE_CC=config/locale/generic/ctype_members.cc
2535 CMESSAGES_H=config/locale/ieee_1003.1-2001/messages_members.h
2536 CMESSAGES_CC=config/locale/ieee_1003.1-2001/messages_members.cc
2537 CMONEY_CC=config/locale/generic/monetary_members.cc
2538 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2539 CTIME_H=config/locale/generic/time_members.h
2540 CTIME_CC=config/locale/generic/time_members.cc
2541 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2544 AC_MSG_RESULT(newlib)
2546 CLOCALE_H=config/locale/generic/c_locale.h
2547 CLOCALE_CC=config/locale/generic/c_locale.cc
2548 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2549 CCOLLATE_CC=config/locale/generic/collate_members.cc
2550 CCTYPE_CC=config/locale/newlib/ctype_members.cc
2551 CMESSAGES_H=config/locale/generic/messages_members.h
2552 CMESSAGES_CC=config/locale/generic/messages_members.cc
2553 CMONEY_CC=config/locale/generic/monetary_members.cc
2554 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2555 CTIME_H=config/locale/generic/time_members.h
2556 CTIME_CC=config/locale/generic/time_members.cc
2557 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2561 # This is where the testsuite looks for locale catalogs, using the
2562 # -DLOCALEDIR define during testsuite compilation.
2563 glibcxx_localedir=${glibcxx_builddir}/po/share/locale
2564 AC_SUBST(glibcxx_localedir)
2566 # A standalone libintl (e.g., GNU libintl) may be in use.
2567 if test $USE_NLS = yes; then
2568 AC_CHECK_HEADERS([libintl.h], [], USE_NLS=no)
2569 AC_SEARCH_LIBS(gettext, intl, [], USE_NLS=no)
2571 if test $USE_NLS = yes; then
2572 AC_DEFINE(_GLIBCXX_USE_NLS, 1,
2573 [Define if NLS translations are to be used.])
2578 AC_SUBST(CMESSAGES_H)
2579 AC_SUBST(CCODECVT_CC)
2580 AC_SUBST(CCOLLATE_CC)
2582 AC_SUBST(CMESSAGES_CC)
2584 AC_SUBST(CNUMERIC_CC)
2587 AC_SUBST(CLOCALE_CC)
2588 AC_SUBST(CLOCALE_INTERNAL_H)
2593 dnl Check for which std::allocator base class to use. The choice is
2594 dnl mapped from a subdirectory of include/ext.
2598 AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
2599 AC_MSG_CHECKING([for std::allocator base class])
2600 GLIBCXX_ENABLE(libstdcxx-allocator,auto,[[[=KIND]]],
2601 [use KIND for target std::allocator base],
2602 [permit new|malloc|yes|no|auto])
2604 # If they didn't use this option switch, or if they specified --enable
2605 # with no specific model, we'll have to look for one. If they
2606 # specified --disable (???), do likewise.
2607 if test $enable_libstdcxx_allocator = no ||
2608 test $enable_libstdcxx_allocator = yes;
2610 enable_libstdcxx_allocator=auto
2613 # Either a known package, or "auto". Auto implies the default choice
2614 # for a particular platform.
2615 enable_libstdcxx_allocator_flag=$enable_libstdcxx_allocator
2617 # Probe for host-specific support if no specific model is specified.
2619 if test $enable_libstdcxx_allocator_flag = auto; then
2620 case ${target_os} in
2621 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2622 enable_libstdcxx_allocator_flag=new
2625 enable_libstdcxx_allocator_flag=new
2629 AC_MSG_RESULT($enable_libstdcxx_allocator_flag)
2632 # Set configure bits for specified locale package
2633 case ${enable_libstdcxx_allocator_flag} in
2635 ALLOCATOR_H=config/allocator/malloc_allocator_base.h
2636 ALLOCATOR_NAME=__gnu_cxx::malloc_allocator
2639 ALLOCATOR_H=config/allocator/new_allocator_base.h
2640 ALLOCATOR_NAME=__gnu_cxx::new_allocator
2644 GLIBCXX_CONDITIONAL(ENABLE_ALLOCATOR_NEW,
2645 test $enable_libstdcxx_allocator_flag = new)
2646 AC_SUBST(ALLOCATOR_H)
2647 AC_SUBST(ALLOCATOR_NAME)
2652 dnl Check for whether the Boost-derived checks should be turned on.
2654 dnl --enable-concept-checks turns them on.
2655 dnl --disable-concept-checks leaves them off.
2656 dnl + Usage: GLIBCXX_ENABLE_CONCEPT_CHECKS[(DEFAULT)]
2657 dnl Where DEFAULT is either `yes' or `no'.
2659 AC_DEFUN([GLIBCXX_ENABLE_CONCEPT_CHECKS], [
2660 GLIBCXX_ENABLE(concept-checks,$1,,[use Boost-derived template checks])
2661 if test $enable_concept_checks = yes; then
2662 AC_DEFINE(_GLIBCXX_CONCEPT_CHECKS, 1,
2663 [Define to use concept checking code from the boost libraries.])
2668 dnl Use extern templates.
2670 dnl --enable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 1
2671 dnl --disable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 0
2673 dnl + Usage: GLIBCXX_ENABLE_TEMPLATE[(DEFAULT)]
2674 dnl Where DEFAULT is `yes' or `no'.
2676 AC_DEFUN([GLIBCXX_ENABLE_EXTERN_TEMPLATE], [
2678 GLIBCXX_ENABLE(extern-template,$1,,[enable extern template])
2680 AC_MSG_CHECKING([for extern template support])
2681 AC_MSG_RESULT([$enable_extern_template])
2683 GLIBCXX_CONDITIONAL(ENABLE_EXTERN_TEMPLATE, test $enable_extern_template = yes)
2687 dnl Use vtable verification.
2689 dnl --enable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 1
2690 dnl --disable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 0
2692 dnl + Usage: GLIBCXX_ENABLE_VTABLE_VERIFY[(DEFAULT)]
2693 dnl Where DEFAULT is `yes' or `no'.
2695 AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY], [
2697 GLIBCXX_ENABLE(vtable-verify,$1,,[enable vtable verify])
2699 AC_MSG_CHECKING([for vtable verify support])
2700 AC_MSG_RESULT([$enable_vtable_verify])
2703 if test $enable_vtable_verify = yes; then
2704 case ${target_os} in
2706 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2707 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2711 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u,_vtable_map_vars_start -Wl,-u,_vtable_map_vars_end"
2712 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-rpath,${toplevel_builddir}/libvtv/.libs"
2715 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2716 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-R -Wl,${toplevel_builddir}/libvtv/.libs"
2719 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2720 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2723 VTV_PCH_CXXFLAGS="-fvtable-verify=std"
2730 AC_SUBST(VTV_CXXFLAGS)
2731 AC_SUBST(VTV_PCH_CXXFLAGS)
2732 AC_SUBST(VTV_CXXLINKFLAGS)
2733 AM_CONDITIONAL(VTV_CYGMIN, test x$vtv_cygmin = xyes)
2734 GLIBCXX_CONDITIONAL(ENABLE_VTABLE_VERIFY, test $enable_vtable_verify = yes)
2738 dnl Check for parallel mode pre-requisites, including OpenMP support.
2740 dnl + Usage: GLIBCXX_ENABLE_PARALLEL
2742 AC_DEFUN([GLIBCXX_ENABLE_PARALLEL], [
2746 # See if configured libgomp/omp.h exists. (libgomp may be in
2747 # noconfigdirs but not explicitly disabled.)
2748 if echo " ${TARGET_CONFIGDIRS} " | grep " libgomp " > /dev/null 2>&1 ; then
2749 enable_parallel=yes;
2751 AC_MSG_NOTICE([target-libgomp not built])
2754 AC_MSG_CHECKING([for parallel mode support])
2755 AC_MSG_RESULT([$enable_parallel])
2760 dnl Check for which I/O library to use: stdio and POSIX, or pure stdio.
2762 dnl Default is stdio_posix.
2764 AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
2765 AC_MSG_CHECKING([for underlying I/O to use])
2766 GLIBCXX_ENABLE(cstdio,stdio,[[[=PACKAGE]]],
2767 [use target-specific I/O package], [permit stdio|stdio_posix|stdio_pure])
2769 # The only available I/O model is based on stdio, via basic_file_stdio.
2770 # The default "stdio" is actually "stdio + POSIX" because it uses fdopen(3)
2771 # to get a file descriptor and then uses read(3) and write(3) with it.
2772 # The "stdio_pure" model doesn't use fdopen and only uses FILE* for I/O.
2773 case ${enable_cstdio} in
2775 CSTDIO_H=config/io/c_io_stdio.h
2776 BASIC_FILE_H=config/io/basic_file_stdio.h
2777 BASIC_FILE_CC=config/io/basic_file_stdio.cc
2778 AC_MSG_RESULT(stdio)
2780 if test "x$enable_cstdio" = "xstdio_pure" ; then
2781 AC_DEFINE(_GLIBCXX_USE_STDIO_PURE, 1,
2782 [Define to restrict std::__basic_file<> to stdio APIs.])
2788 AC_SUBST(BASIC_FILE_H)
2789 AC_SUBST(BASIC_FILE_CC)
2794 dnl Check for "unusual" flags to pass to the compiler while building.
2796 dnl --enable-cxx-flags='-foo -bar -baz' is a general method for passing
2797 dnl experimental flags such as -fpch, -fIMI, -Dfloat=char, etc.
2798 dnl --disable-cxx-flags passes nothing.
2799 dnl + See http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00131.html
2800 dnl http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00284.html
2801 dnl http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00035.html
2802 dnl + Usage: GLIBCXX_ENABLE_CXX_FLAGS(default flags)
2803 dnl If "default flags" is an empty string, the effect is the same
2804 dnl as --disable or --enable=no.
2806 AC_DEFUN([GLIBCXX_ENABLE_CXX_FLAGS], [dnl
2807 AC_MSG_CHECKING([for extra compiler flags for building])
2808 GLIBCXX_ENABLE(cxx-flags,$1,[=FLAGS],
2809 [pass compiler FLAGS when building library],
2810 [case "x$enable_cxx_flags" in
2811 xno | x) enable_cxx_flags= ;;
2813 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2816 # Run through flags (either default or command-line) and set anything
2817 # extra (e.g., #defines) that must accompany particular g++ options.
2818 if test -n "$enable_cxx_flags"; then
2819 for f in $enable_cxx_flags; do
2823 *) # and we're trying to pass /what/ exactly?
2824 AC_MSG_ERROR([compiler flags start with a -]) ;;
2829 EXTRA_CXX_FLAGS="$enable_cxx_flags"
2830 AC_MSG_RESULT($EXTRA_CXX_FLAGS)
2831 AC_SUBST(EXTRA_CXX_FLAGS)
2836 dnl Check to see if debugging libraries are to be built.
2838 dnl --enable-libstdcxx-debug
2839 dnl builds a separate set of debugging libraries in addition to the
2840 dnl normal (shared, static) libstdc++ binaries.
2842 dnl --disable-libstdcxx-debug
2843 dnl builds only one (non-debug) version of libstdc++.
2845 dnl --enable-libstdcxx-debug-flags=FLAGS
2846 dnl iff --enable-debug == yes, then use FLAGS to build the debug library.
2848 dnl + Usage: GLIBCXX_ENABLE_DEBUG[(DEFAULT)]
2849 dnl Where DEFAULT is either `yes' or `no'.
2851 AC_DEFUN([GLIBCXX_ENABLE_DEBUG], [
2852 AC_MSG_CHECKING([for additional debug build])
2854 GLIBCXX_ENABLE(libstdcxx-debug,$1,,[build extra debug library])
2855 if test x$enable_libstdcxx_debug = xyes; then
2856 if test -f $toplevel_builddir/../stage_final \
2857 && test -f $toplevel_builddir/../stage_current; then
2858 stage_final=`cat $toplevel_builddir/../stage_final`
2859 stage_current=`cat $toplevel_builddir/../stage_current`
2860 if test x$stage_current != x$stage_final ; then
2861 skip_debug_build=" (skipped for bootstrap stage $stage_current)"
2862 enable_libstdcxx_debug=no
2866 AC_MSG_RESULT($enable_libstdcxx_debug$skip_debug_build)
2867 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_DEBUG, test $enable_libstdcxx_debug = yes)
2872 dnl Check for explicit debug flags.
2874 dnl --enable-libstdcxx-debug-flags='-O1'
2875 dnl is a general method for passing flags to be used when
2876 dnl building debug libraries with --enable-libstdcxx-debug.
2878 dnl --disable-libstdcxx-debug-flags does nothing.
2879 dnl + Usage: GLIBCXX_ENABLE_DEBUG_FLAGS(default flags)
2880 dnl If "default flags" is an empty string, the effect is the same
2881 dnl as --disable or --enable=no.
2883 AC_DEFUN([GLIBCXX_ENABLE_DEBUG_FLAGS], [
2884 GLIBCXX_ENABLE(libstdcxx-debug-flags,[$1],[=FLAGS],
2885 [pass compiler FLAGS when building debug library],
2886 [case "x$enable_libstdcxx_debug_flags" in
2887 xno | x) enable_libstdcxx_debug_flags= ;;
2889 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2892 # Option parsed, now set things appropriately
2893 DEBUG_FLAGS="$enable_libstdcxx_debug_flags"
2894 AC_SUBST(DEBUG_FLAGS)
2896 AC_MSG_NOTICE([Debug build flags set to $DEBUG_FLAGS])
2901 dnl Check if the user only wants a freestanding library implementation.
2903 dnl --disable-hosted-libstdcxx will turn off most of the library build,
2904 dnl installing only the headers required by [17.4.1.3] and the language
2905 dnl support library. More than that will be built (to keep the Makefiles
2906 dnl conveniently clean), but not installed.
2909 dnl is_hosted (yes/no)
2912 dnl _GLIBCXX_HOSTED (always defined, either to 1 or 0)
2914 AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
2915 AC_ARG_ENABLE([hosted-libstdcxx],
2916 AC_HELP_STRING([--disable-hosted-libstdcxx],
2917 [only build freestanding C++ runtime support]),,
2920 enable_hosted_libstdcxx=no
2923 enable_hosted_libstdcxx=yes
2926 if test "$enable_hosted_libstdcxx" = no; then
2927 AC_MSG_NOTICE([Only freestanding libraries will be built])
2931 enable_libstdcxx_pch=no
2936 GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
2937 AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
2938 [Define to 1 if a full hosted library is built, or 0 if freestanding.])
2943 dnl Check if the user wants a non-verbose library implementation.
2945 dnl --disable-libstdcxx-verbose will turn off descriptive messages to
2946 dnl standard error on termination.
2949 dnl _GLIBCXX_VERBOSE (always defined, either to 1 or 0)
2951 AC_DEFUN([GLIBCXX_ENABLE_VERBOSE], [
2952 AC_ARG_ENABLE([libstdcxx-verbose],
2953 AC_HELP_STRING([--disable-libstdcxx-verbose],
2954 [disable termination messages to standard error]),,
2955 [enable_libstdcxx_verbose=yes])
2956 if test x"$enable_libstdcxx_verbose" = xyes; then
2959 AC_MSG_NOTICE([verbose termination messages are disabled])
2962 AC_DEFINE_UNQUOTED(_GLIBCXX_VERBOSE, $verbose_define,
2963 [Define to 1 if a verbose library is built, or 0 otherwise.])
2968 dnl Check for template specializations for the 'long long' type.
2969 dnl The result determines only whether 'long long' I/O is enabled; things
2970 dnl like numeric_limits<> specializations are always available.
2972 dnl --enable-long-long defines _GLIBCXX_USE_LONG_LONG
2973 dnl --disable-long-long leaves _GLIBCXX_USE_LONG_LONG undefined
2974 dnl + Usage: GLIBCXX_ENABLE_LONG_LONG[(DEFAULT)]
2975 dnl Where DEFAULT is either `yes' or `no'.
2977 AC_DEFUN([GLIBCXX_ENABLE_LONG_LONG], [
2978 GLIBCXX_ENABLE(long-long,$1,,[enable template specializations for 'long long'])
2979 if test $enable_long_long = yes; then
2980 AC_DEFINE(_GLIBCXX_USE_LONG_LONG, 1,
2981 [Define if code specialized for long long should be used.])
2983 AC_MSG_CHECKING([for enabled long long specializations])
2984 AC_MSG_RESULT([$enable_long_long])
2989 dnl Check for decimal floating point.
2991 dnl http://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float
2993 dnl This checks to see if the host supports decimal floating point types.
2996 dnl _GLIBCXX_USE_DECIMAL_FLOAT
2998 AC_DEFUN([GLIBCXX_ENABLE_DECIMAL_FLOAT], [
3000 # Fake what AC_TRY_COMPILE does, without linking as this is
3001 # unnecessary for this test.
3003 cat > conftest.$ac_ext << EOF
3004 [#]line __oline__ "configure"
3014 AC_MSG_CHECKING([for ISO/IEC TR 24733 ])
3015 if AC_TRY_EVAL(ac_compile); then
3016 AC_DEFINE(_GLIBCXX_USE_DECIMAL_FLOAT, 1,
3017 [Define if ISO/IEC TR 24733 decimal floating point types are supported on this host.])
3022 AC_MSG_RESULT($enable_dfp)
3027 dnl Check for GNU 128-bit floating point type.
3029 dnl Note: also checks that the type isn't a standard types.
3034 AC_DEFUN([GLIBCXX_ENABLE_FLOAT128], [
3039 # Fake what AC_TRY_COMPILE does, without linking as this is
3040 # unnecessary for this test.
3042 cat > conftest.$ac_ext << EOF
3043 [#]line __oline__ "configure"
3044 template<typename T1, typename T2>
3046 { typedef T2 type; };
3048 template<typename T>
3053 typename same<double, __float128>::type f1;
3054 typename same<long double, __float128>::type f2;
3058 AC_MSG_CHECKING([for __float128])
3059 if AC_TRY_EVAL(ac_compile); then
3064 AC_MSG_RESULT($enable_float128)
3065 GLIBCXX_CONDITIONAL(ENABLE_FLOAT128, test $enable_float128 = yes)
3072 dnl Check for template specializations for the 'wchar_t' type.
3074 dnl --enable-wchar_t defines _GLIBCXX_USE_WCHAR_T
3075 dnl --disable-wchar_t leaves _GLIBCXX_USE_WCHAR_T undefined
3076 dnl + Usage: GLIBCXX_ENABLE_WCHAR_T[(DEFAULT)]
3077 dnl Where DEFAULT is either `yes' or `no'.
3079 dnl Necessary support must also be present.
3081 AC_DEFUN([GLIBCXX_ENABLE_WCHAR_T], [
3082 GLIBCXX_ENABLE(wchar_t,$1,,[enable template specializations for 'wchar_t'])
3084 # Test wchar.h for mbstate_t, which is needed for char_traits and fpos.
3085 AC_CHECK_HEADERS(wchar.h, ac_has_wchar_h=yes, ac_has_wchar_h=no)
3086 AC_MSG_CHECKING([for mbstate_t])
3087 AC_TRY_COMPILE([#include <wchar.h>],
3088 [mbstate_t teststate;],
3089 have_mbstate_t=yes, have_mbstate_t=no)
3090 AC_MSG_RESULT($have_mbstate_t)
3091 if test x"$have_mbstate_t" = xyes; then
3092 AC_DEFINE(HAVE_MBSTATE_T,1,[Define if mbstate_t exists in wchar.h.])
3095 # Test it always, for use in GLIBCXX_ENABLE_C99, together with
3097 AC_CHECK_HEADERS(wctype.h, ac_has_wctype_h=yes, ac_has_wctype_h=no)
3099 if test x"$enable_wchar_t" = x"yes"; then
3104 if test x"$ac_has_wchar_h" = xyes &&
3105 test x"$ac_has_wctype_h" = xyes; then
3106 AC_TRY_COMPILE([#include <wchar.h>
3167 ],[],[], [enable_wchar_t=no])
3175 if test x"$enable_wchar_t" = x"yes"; then
3176 AC_DEFINE(_GLIBCXX_USE_WCHAR_T, 1,
3177 [Define if code specialized for wchar_t should be used.])
3180 AC_MSG_CHECKING([for enabled wchar_t specializations])
3181 AC_MSG_RESULT([$enable_wchar_t])
3186 dnl Check to see if building and using a C++ precompiled header can be done.
3188 dnl --enable-libstdcxx-pch=yes
3189 dnl default, this shows intent to use stdc++.h.gch If it looks like it
3190 dnl may work, after some light-hearted attempts to puzzle out compiler
3191 dnl support, flip bits on in include/Makefile.am
3193 dnl --disable-libstdcxx-pch
3194 dnl turns off attempts to use or build stdc++.h.gch.
3197 dnl glibcxx_PCHFLAGS
3199 AC_DEFUN([GLIBCXX_ENABLE_PCH], [
3200 GLIBCXX_ENABLE(libstdcxx-pch,$1,,[build pre-compiled libstdc++ headers])
3201 if test $enable_libstdcxx_pch = yes; then
3202 AC_CACHE_CHECK([for compiler with PCH support],
3203 [glibcxx_cv_prog_CXX_pch],
3204 [ac_save_CXXFLAGS="$CXXFLAGS"
3205 CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
3208 echo '#include <math.h>' > conftest.h
3209 if $CXX $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
3210 -o conftest.h.gch 1>&5 2>&1 &&
3211 echo '#error "pch failed"' > conftest.h &&
3212 echo '#include "conftest.h"' > conftest.cc &&
3213 $CXX -c $CXXFLAGS $CPPFLAGS conftest.cc 1>&5 2>&1 ;
3215 glibcxx_cv_prog_CXX_pch=yes
3217 glibcxx_cv_prog_CXX_pch=no
3220 CXXFLAGS=$ac_save_CXXFLAGS
3223 enable_libstdcxx_pch=$glibcxx_cv_prog_CXX_pch
3226 AC_MSG_CHECKING([for enabled PCH])
3227 AC_MSG_RESULT([$enable_libstdcxx_pch])
3229 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_PCH, test $enable_libstdcxx_pch = yes)
3230 if test $enable_libstdcxx_pch = yes; then
3231 glibcxx_PCHFLAGS="-include bits/stdc++.h"
3235 AC_SUBST(glibcxx_PCHFLAGS)
3240 dnl Check for atomic builtins.
3242 dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
3244 dnl This checks to see if the host supports the compiler-generated
3245 dnl builtins for atomic operations for various integral sizes. Note, this
3246 dnl is intended to be an all-or-nothing switch, so all the atomic operations
3247 dnl that are used should be checked.
3250 dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
3252 AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
3255 old_CXXFLAGS="$CXXFLAGS"
3257 # Do link tests if possible, instead asm tests, limited to some platforms
3258 # see discussion in PR target/40134, PR libstdc++/40133 and the thread
3259 # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
3260 atomic_builtins_link_tests=no
3261 if test x$gcc_no_link != xyes; then
3262 # Can do link tests. Limit to some tested platforms
3264 *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
3265 atomic_builtins_link_tests=yes
3270 if test x$atomic_builtins_link_tests = xyes; then
3274 CXXFLAGS="$CXXFLAGS -fno-exceptions"
3276 AC_CACHE_CHECK([for atomic builtins for bool],
3277 glibcxx_cv_atomic_bool, [
3280 [typedef bool atomic_type;
3284 // N.B. __atomic_fetch_add is not supported for bool.
3285 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3287 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3288 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3290 [glibcxx_cv_atomic_bool=yes],
3291 [glibcxx_cv_atomic_bool=no])
3294 AC_CACHE_CHECK([for atomic builtins for short],
3295 glibcxx_cv_atomic_short, [
3298 [typedef short atomic_type;
3302 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3303 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3305 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3306 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3308 [glibcxx_cv_atomic_short=yes],
3309 [glibcxx_cv_atomic_short=no])
3312 AC_CACHE_CHECK([for atomic builtins for int],
3313 glibcxx_cv_atomic_int, [
3316 [typedef int atomic_type;
3320 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3321 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3323 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3324 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3326 [glibcxx_cv_atomic_int=yes],
3327 [glibcxx_cv_atomic_int=no])
3330 AC_CACHE_CHECK([for atomic builtins for long long],
3331 glibcxx_cv_atomic_long_long, [
3334 [typedef long long atomic_type;
3338 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3339 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3341 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3342 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3344 [glibcxx_cv_atomic_long_long=yes],
3345 [glibcxx_cv_atomic_long_long=no])
3352 # Compile unoptimized.
3355 # Fake what AC_TRY_COMPILE does.
3357 cat > conftest.$ac_ext << EOF
3358 [#]line __oline__ "configure"
3361 typedef bool atomic_type;
3365 // N.B. __atomic_fetch_add is not supported for bool.
3366 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3368 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3369 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3375 AC_MSG_CHECKING([for atomic builtins for bool])
3376 if AC_TRY_EVAL(ac_compile); then
3377 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3378 glibcxx_cv_atomic_bool=no
3380 glibcxx_cv_atomic_bool=yes
3383 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3386 cat > conftest.$ac_ext << EOF
3387 [#]line __oline__ "configure"
3390 typedef short atomic_type;
3394 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3395 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3397 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3398 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3404 AC_MSG_CHECKING([for atomic builtins for short])
3405 if AC_TRY_EVAL(ac_compile); then
3406 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3407 glibcxx_cv_atomic_short=no
3409 glibcxx_cv_atomic_short=yes
3412 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3415 cat > conftest.$ac_ext << EOF
3416 [#]line __oline__ "configure"
3419 // NB: _Atomic_word not necessarily int.
3420 typedef int atomic_type;
3424 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3425 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3427 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3428 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3434 AC_MSG_CHECKING([for atomic builtins for int])
3435 if AC_TRY_EVAL(ac_compile); then
3436 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3437 glibcxx_cv_atomic_int=no
3439 glibcxx_cv_atomic_int=yes
3442 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3445 cat > conftest.$ac_ext << EOF
3446 [#]line __oline__ "configure"
3449 typedef long long atomic_type;
3453 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3454 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3456 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3457 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3463 AC_MSG_CHECKING([for atomic builtins for long long])
3464 if AC_TRY_EVAL(ac_compile); then
3465 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3466 glibcxx_cv_atomic_long_long=no
3468 glibcxx_cv_atomic_long_long=yes
3471 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3476 CXXFLAGS="$old_CXXFLAGS"
3479 # Set atomicity_dir to builtins if all but the long long test above passes,
3480 # or if the builtins were already chosen (e.g. by configure.host).
3481 if { test "$glibcxx_cv_atomic_bool" = yes \
3482 && test "$glibcxx_cv_atomic_short" = yes \
3483 && test "$glibcxx_cv_atomic_int" = yes; } \
3484 || test "$atomicity_dir" = "cpu/generic/atomicity_builtins"; then
3485 AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS, 1,
3486 [Define if the compiler supports C++11 atomics.])
3487 atomicity_dir=cpu/generic/atomicity_builtins
3490 # If still generic, set to mutex.
3491 if test $atomicity_dir = "cpu/generic" ; then
3492 atomicity_dir=cpu/generic/atomicity_mutex
3493 AC_MSG_WARN([No native atomic operations are provided for this platform.])
3494 if test "x$target_thread_file" = xsingle; then
3495 AC_MSG_WARN([They cannot be faked when thread support is disabled.])
3496 AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
3498 AC_MSG_WARN([They will be faked using a mutex.])
3499 AC_MSG_WARN([Performance of certain classes will degrade as a result.])
3506 dnl Set default lock policy for synchronizing shared_ptr reference counting.
3508 dnl --with-libstdcxx-lock-policy=auto
3509 dnl Use atomic operations for shared_ptr reference counting only if
3510 dnl the default target supports atomic compare-and-swap.
3511 dnl --with-libstdcxx-lock-policy=atomic
3512 dnl Use atomic operations for shared_ptr reference counting.
3513 dnl --with-libstdcxx-lock-policy=mutex
3514 dnl Use a mutex to synchronize shared_ptr reference counting.
3516 dnl This controls the value of __gnu_cxx::__default_lock_policy, which
3517 dnl determines how shared_ptr reference counts are synchronized.
3518 dnl The option "atomic" means that atomic operations should be used,
3519 dnl "mutex" means that a mutex will be used. The default option, "auto",
3520 dnl will check if the target supports the compiler-generated builtins
3521 dnl for atomic compare-and-swap operations for 2-byte and 4-byte integers,
3522 dnl and will use "atomic" if supported, "mutex" otherwise.
3523 dnl This option is ignored if the thread model used by GCC is "single",
3524 dnl as no synchronization is used at all in that case.
3525 dnl This option affects the library ABI (except in the "single" thread model).
3527 dnl Defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY to 1 if atomics should be used.
3529 AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [
3531 AC_ARG_WITH([libstdcxx-lock-policy],
3532 AC_HELP_STRING([--with-libstdcxx-lock-policy={atomic,mutex,auto}],
3533 [synchronization policy for shared_ptr reference counting [default=auto]]),
3534 [libstdcxx_atomic_lock_policy=$withval],
3535 [libstdcxx_atomic_lock_policy=auto])
3537 case "$libstdcxx_atomic_lock_policy" in
3538 atomic|mutex|auto) ;;
3539 *) AC_MSG_ERROR([Invalid argument for --with-libstdcxx-lock-policy]) ;;
3541 AC_MSG_CHECKING([for lock policy for shared_ptr reference counts])
3543 if test x"$libstdcxx_atomic_lock_policy" = x"auto"; then
3546 ac_save_CXXFLAGS="$CXXFLAGS"
3548 dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?!
3550 #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
3551 # error "No 2-byte compare-and-swap"
3552 #elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
3553 # error "No 4-byte compare-and-swap"
3556 [libstdcxx_atomic_lock_policy=atomic],
3557 [libstdcxx_atomic_lock_policy=mutex])
3559 CXXFLAGS="$ac_save_CXXFLAGS"
3562 if test x"$libstdcxx_atomic_lock_policy" = x"atomic"; then
3563 AC_MSG_RESULT(atomic)
3564 AC_DEFINE(HAVE_ATOMIC_LOCK_POLICY,1,
3565 [Defined if shared_ptr reference counting should use atomic operations.])
3567 AC_MSG_RESULT(mutex)
3573 dnl Allow visibility attributes to be used on namespaces, objects, etc.
3575 dnl --enable-libstdcxx-visibility enables attempt to use visibility attributes.
3576 dnl --disable-libstdcxx-visibility turns off all use of visibility attributes.
3577 dnl + Usage: GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY[(DEFAULT)]
3578 dnl Where DEFAULT is 'yes'.
3580 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY], [
3581 GLIBCXX_ENABLE(libstdcxx-visibility,$1,,[enables visibility safe usage])
3583 if test x$enable_libstdcxx_visibility = xyes ; then
3584 dnl all hail libgfortran
3585 dnl Check whether the target supports hidden visibility.
3586 AC_CACHE_CHECK([whether the target supports hidden visibility],
3587 glibcxx_cv_have_attribute_visibility, [
3588 save_CFLAGS="$CFLAGS"
3589 CFLAGS="$CFLAGS -Werror"
3590 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
3591 [], glibcxx_cv_have_attribute_visibility=yes,
3592 glibcxx_cv_have_attribute_visibility=no)
3593 CFLAGS="$save_CFLAGS"])
3594 if test $glibcxx_cv_have_attribute_visibility = no; then
3595 enable_libstdcxx_visibility=no
3599 GLIBCXX_CONDITIONAL(ENABLE_VISIBILITY, test $enable_libstdcxx_visibility = yes)
3600 AC_MSG_NOTICE([visibility supported: $enable_libstdcxx_visibility])
3605 dnl Add version tags to symbols in shared library (or not), additionally
3606 dnl marking other symbols as private/local (or not).
3608 dnl Sets libtool_VERSION, and determines shared library SONAME.
3610 dnl This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
3612 dnl --enable-symvers=style adds a version script to the linker call when
3613 dnl creating the shared library. The choice of version script is
3614 dnl controlled by 'style'.
3615 dnl --disable-symvers does not.
3617 dnl + Usage: GLIBCXX_ENABLE_SYMVERS[(DEFAULT)]
3618 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
3619 dnl choose a default style based on linker characteristics. Passing
3620 dnl 'no' disables versioning.
3622 AC_DEFUN([GLIBCXX_ENABLE_SYMVERS], [
3624 GLIBCXX_ENABLE(symvers,$1,[[[=STYLE]]],
3625 [enables symbol versioning of the shared library],
3626 [permit yes|no|gnu|gnu-versioned-namespace|darwin|darwin-export|sun])
3628 # If we never went through the GLIBCXX_CHECK_LINKER_FEATURES macro, then we
3629 # don't know enough about $LD to do tricks...
3630 AC_REQUIRE([GLIBCXX_CHECK_LINKER_FEATURES])
3631 # Sun style symbol versions needs GNU c++filt for make_sunver.pl to work
3632 # with extern "C++" in version scripts.
3633 AC_REQUIRE([GCC_PROG_GNU_CXXFILT])
3635 # Turn a 'yes' into a suitable default.
3636 if test x$enable_symvers = xyes ; then
3637 if test $enable_shared = no || test "x$LD" = x || test x$gcc_no_link = xyes; then
3640 if test $with_gnu_ld = yes ; then
3641 case ${target_os} in
3643 enable_symvers=no ;;
3645 enable_symvers=gnu ;;
3648 case ${target_os} in
3650 enable_symvers=darwin ;;
3651 # Sun symbol versioning exists since Solaris 2.5.
3652 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
3653 # make_sunver.pl needs GNU c++filt to support extern "C++" in
3654 # version scripts, so disable symbol versioning if none can be
3656 if test -z "$ac_cv_path_CXXFILT"; then
3657 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3658 AC_MSG_WARN([=== no GNU c++filt could be found.])
3659 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3666 enable_symvers=no ;;
3672 # Check to see if 'darwin' or 'darwin-export' can win.
3673 if test x$enable_symvers = xdarwin-export ; then
3674 enable_symvers=darwin
3677 # Check if 'sun' was requested on non-Solaris 2 platforms.
3678 if test x$enable_symvers = xsun ; then
3679 case ${target_os} in
3685 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3686 AC_MSG_WARN([=== you are not targetting Solaris 2.])
3687 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3693 # Check to see if 'gnu' can win.
3694 if test $enable_symvers = gnu ||
3695 test $enable_symvers = gnu-versioned-namespace ||
3696 test $enable_symvers = sun; then
3697 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
3698 AC_MSG_CHECKING([for shared libgcc])
3699 ac_save_CFLAGS="$CFLAGS"
3701 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes, glibcxx_shared_libgcc=no)
3702 CFLAGS="$ac_save_CFLAGS"
3703 if test $glibcxx_shared_libgcc = no; then
3704 cat > conftest.c <<EOF
3705 int main (void) { return 0; }
3708 glibcxx_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
3709 -shared -shared-libgcc -o conftest.so \
3710 conftest.c -v 2>&1 >/dev/null \
3711 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
3713 rm -f conftest.c conftest.so
3714 if test x${glibcxx_libgcc_s_suffix+set} = xset; then
3715 CFLAGS=" -lgcc_s$glibcxx_libgcc_s_suffix"
3716 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes)
3717 CFLAGS="$ac_save_CFLAGS"
3720 AC_MSG_RESULT($glibcxx_shared_libgcc)
3722 # For GNU ld, we need at least this version. The format is described in
3723 # GLIBCXX_CHECK_LINKER_FEATURES above.
3724 glibcxx_min_gnu_ld_version=21400
3726 # If no shared libgcc, can't win.
3727 if test $glibcxx_shared_libgcc != yes; then
3728 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3729 AC_MSG_WARN([=== you are not building a shared libgcc_s.])
3730 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3732 elif test $with_gnu_ld != yes && test $enable_symvers = sun; then
3733 : All interesting versions of Sun ld support sun style symbol versioning.
3734 elif test $with_gnu_ld != yes ; then
3736 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3737 AC_MSG_WARN([=== you are not using the GNU linker.])
3738 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3740 elif test $glibcxx_ld_is_gold = yes ; then
3741 : All versions of gold support symbol versioning.
3742 elif test $glibcxx_gnu_ld_version -lt $glibcxx_min_gnu_ld_version ; then
3743 # The right tools, the right setup, but too old. Fallbacks?
3744 AC_MSG_WARN(=== Linker version $glibcxx_gnu_ld_version is too old for)
3745 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
3746 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
3747 AC_MSG_WARN(=== $glibcxx_min_gnu_ld_version or later and rebuild GCC.)
3748 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3753 # For libtool versioning info, format is CURRENT:REVISION:AGE
3754 libtool_VERSION=6:30:0
3756 # Everything parsed; figure out what files and settings to use.
3757 case $enable_symvers in
3759 SYMVER_FILE=config/abi/pre/none.ver
3762 SYMVER_FILE=config/abi/pre/gnu.ver
3763 AC_DEFINE(_GLIBCXX_SYMVER_GNU, 1,
3764 [Define to use GNU versioning in the shared library.])
3766 gnu-versioned-namespace)
3767 libtool_VERSION=8:0:0
3768 SYMVER_FILE=config/abi/pre/gnu-versioned-namespace.ver
3769 AC_DEFINE(_GLIBCXX_SYMVER_GNU_NAMESPACE, 1,
3770 [Define to use GNU namespace versioning in the shared library.])
3773 SYMVER_FILE=config/abi/pre/gnu.ver
3774 AC_DEFINE(_GLIBCXX_SYMVER_DARWIN, 1,
3775 [Define to use darwin versioning in the shared library.])
3778 SYMVER_FILE=config/abi/pre/gnu.ver
3779 AC_DEFINE(_GLIBCXX_SYMVER_SUN, 1,
3780 [Define to use Sun versioning in the shared library.])
3784 if test x$enable_symvers != xno ; then
3785 AC_DEFINE(_GLIBCXX_SYMVER, 1,
3786 [Define to use symbol versioning in the shared library.])
3789 AC_CACHE_CHECK([whether the target supports .symver directive],
3790 glibcxx_cv_have_as_symver_directive, [
3791 AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
3792 [], glibcxx_cv_have_as_symver_directive=yes,
3793 glibcxx_cv_have_as_symver_directive=no)])
3794 if test $glibcxx_cv_have_as_symver_directive = yes; then
3795 AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
3796 [Define to 1 if the target assembler supports .symver directive.])
3799 AC_SUBST(SYMVER_FILE)
3800 AC_SUBST(port_specific_symbol_files)
3801 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS, test $enable_symvers != no)
3802 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU, test $enable_symvers = gnu)
3803 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU_NAMESPACE, test $enable_symvers = gnu-versioned-namespace)
3804 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_DARWIN, test $enable_symvers = darwin)
3805 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_SUN, test $enable_symvers = sun)
3806 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
3808 if test $enable_symvers != no ; then
3809 case ${target_os} in
3810 # The Solaris 2 runtime linker doesn't support the GNU extension of
3811 # binding the same symbol to different versions
3814 # Other platforms with GNU symbol versioning (GNU/Linux, more?) do.
3816 AC_DEFINE(HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT, 1,
3817 [Define to 1 if the target runtime linker supports binding the same symbol to different versions.])
3822 # Now, set up compatibility support, if any.
3823 # In addition, need this to deal with std::size_t mangling in
3824 # src/compatibility.cc. In a perfect world, could use
3825 # typeid(std::size_t).name()[0] to do direct substitution.
3826 AC_MSG_CHECKING([for size_t as unsigned int])
3827 ac_save_CFLAGS="$CFLAGS"
3829 AC_TRY_COMPILE(, [__SIZE_TYPE__* stp; unsigned int* uip; stp = uip;],
3830 [glibcxx_size_t_is_i=yes], [glibcxx_size_t_is_i=no])
3831 CFLAGS=$ac_save_CFLAGS
3832 if test "$glibcxx_size_t_is_i" = yes; then
3833 AC_DEFINE(_GLIBCXX_SIZE_T_IS_UINT, 1, [Define if size_t is unsigned int.])
3835 AC_MSG_RESULT([$glibcxx_size_t_is_i])
3837 AC_MSG_CHECKING([for ptrdiff_t as int])
3838 ac_save_CFLAGS="$CFLAGS"
3840 AC_TRY_COMPILE(, [__PTRDIFF_TYPE__* ptp; int* ip; ptp = ip;],
3841 [glibcxx_ptrdiff_t_is_i=yes], [glibcxx_ptrdiff_t_is_i=no])
3842 CFLAGS=$ac_save_CFLAGS
3843 if test "$glibcxx_ptrdiff_t_is_i" = yes; then
3844 AC_DEFINE(_GLIBCXX_PTRDIFF_T_IS_INT, 1, [Define if ptrdiff_t is int.])
3846 AC_MSG_RESULT([$glibcxx_ptrdiff_t_is_i])
3851 dnl Setup to use the gcc gthr.h thread-specific memory and mutex model.
3852 dnl We must stage the required headers so that they will be installed
3853 dnl with the library (unlike libgcc, the STL implementation is provided
3854 dnl solely within headers). Since we must not inject random user-space
3855 dnl macro names into user-provided C++ code, we first stage into <file>-in
3856 dnl and process to <file> with an output command. The reason for a two-
3857 dnl stage process here is to correctly handle $srcdir!=$objdir without
3858 dnl having to write complex code (the sed commands to clean the macro
3859 dnl namespace are complex and fragile enough as it is). We must also
3860 dnl add a relative path so that -I- is supported properly.
3865 AC_DEFUN([GLIBCXX_ENABLE_THREADS], [
3866 AC_MSG_CHECKING([for thread model used by GCC])
3867 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3868 AC_MSG_RESULT([$target_thread_file])
3869 GCC_AC_THREAD_HEADER([$target_thread_file])
3874 dnl Check if gthread implementation defines the types and functions
3875 dnl required by the c++0x thread library. Conforming gthread
3876 dnl implementations can define __GTHREADS_CXX0X to enable use with c++0x.
3878 dnl GLIBCXX_ENABLE_SYMVERS must be done before this.
3880 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
3881 GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
3883 if test x$enable_libstdcxx_threads = xauto ||
3884 test x$enable_libstdcxx_threads = xyes; then
3889 ac_save_CXXFLAGS="$CXXFLAGS"
3890 CXXFLAGS="$CXXFLAGS -fno-exceptions \
3891 -I${toplevel_srcdir}/libgcc -I${toplevel_builddir}/libgcc"
3893 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3894 case $target_thread_file in
3896 CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
3899 AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
3901 AC_TRY_COMPILE([#include <unistd.h>],
3903 // In case of POSIX threads check _POSIX_TIMEOUTS.
3904 #if (defined(_PTHREADS) \
3905 && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
3908 ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
3910 AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
3911 [Define to 1 if mutex_timedlock is available.])
3913 if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
3914 else res_mutex_timedlock=no ; fi
3915 AC_MSG_RESULT([$res_mutex_timedlock])
3917 AC_MSG_CHECKING([for gthreads library])
3919 AC_TRY_COMPILE([#include "gthr.h"],
3921 #ifndef __GTHREADS_CXX0X
3924 ], [ac_has_gthreads=yes], [ac_has_gthreads=no])
3929 AC_MSG_RESULT([$ac_has_gthreads])
3931 if test x"$ac_has_gthreads" = x"yes"; then
3932 AC_DEFINE(_GLIBCXX_HAS_GTHREADS, 1,
3933 [Define if gthreads library is available.])
3935 # Also check for pthread_rwlock_t for std::shared_timed_mutex in C++14
3936 # but only do so if we're using pthread in the gthread library.
3937 # On VxWorks for example, pthread_rwlock_t is defined in sys/types.h
3938 # but the pthread library is not there by default and the gthread library
3940 AC_TRY_COMPILE([#include "gthr.h"],
3942 #if (!defined(_PTHREADS))
3945 ], [ac_gthread_use_pthreads=yes], [ac_gthread_use_pthreads=no])
3946 if test x"$ac_gthread_use_pthreads" = x"yes"; then
3947 AC_CHECK_TYPE([pthread_rwlock_t],
3948 [AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
3949 [Define if POSIX read/write locks are available in <gthr.h>.])],
3951 [#include "gthr.h"])
3955 AC_CHECK_HEADER(semaphore.h, [
3956 AC_MSG_CHECKING([for POSIX Semaphores and sem_timedwait])
3959 #include <semaphore.h>
3963 #if !defined _POSIX_TIMEOUTS || _POSIX_TIMEOUTS <= 0
3964 # error "POSIX Timeouts option not supported"
3965 #elif !defined _POSIX_SEMAPHORES || _POSIX_SEMAPHORES <= 0
3966 # error "POSIX Semaphores option not supported"
3968 #if defined SEM_VALUE_MAX
3969 constexpr int sem_value_max = SEM_VALUE_MAX;
3970 #elif defined _POSIX_SEM_VALUE_MAX
3971 constexpr int sem_value_max = _POSIX_SEM_VALUE_MAX;
3973 # error "SEM_VALUE_MAX not available"
3976 sem_init(&sem, 0, sem_value_max);
3977 struct timespec ts = { 0 };
3978 sem_timedwait(&sem, &ts);
3981 [ac_have_posix_semaphore=yes],
3982 [ac_have_posix_semaphore=no])],
3983 [ac_have_posix_semaphore=no])
3985 if test $ac_have_posix_semaphore = yes ; then
3986 AC_DEFINE(HAVE_POSIX_SEMAPHORE,
3988 [Define to 1 if POSIX Semaphores with sem_timedwait are available in <semaphore.h>.])
3990 AC_MSG_RESULT([$ac_have_posix_semaphore])
3992 CXXFLAGS="$ac_save_CXXFLAGS"
3997 # Check whether LC_MESSAGES is available in <locale.h>.
3998 # Ulrich Drepper <drepper@cygnus.com>, 1995.
4000 # This file file be copied and used freely without restrictions. It can
4001 # be used in projects which are not available under the GNU Public License
4002 # but which still want to provide support for the GNU gettext functionality.
4003 # Please note that the actual code is *not* freely available.
4004 AC_DEFUN([AC_LC_MESSAGES], [
4005 AC_CHECK_HEADER(locale.h, [
4006 AC_CACHE_CHECK([for LC_MESSAGES], ac_cv_val_LC_MESSAGES,
4007 [AC_TRY_COMPILE([#include <locale.h>], [return LC_MESSAGES],
4008 ac_cv_val_LC_MESSAGES=yes, ac_cv_val_LC_MESSAGES=no)])
4009 if test $ac_cv_val_LC_MESSAGES = yes; then
4010 AC_DEFINE(HAVE_LC_MESSAGES, 1,
4011 [Define if LC_MESSAGES is available in <locale.h>.])
4017 dnl Check whether rdrand is supported in the assembler.
4018 AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [
4019 AC_CACHE_CHECK([for rdrand support in assembler],
4025 AC_TRY_COMPILE(, [asm("rdrand %eax");],
4026 [ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no])
4029 if test $ac_cv_x86_rdrand = yes; then
4030 AC_DEFINE(_GLIBCXX_X86_RDRAND, 1,
4031 [ Defined if as can handle rdrand. ])
4036 dnl Check whether rdseed is supported in the assembler.
4037 AC_DEFUN([GLIBCXX_CHECK_X86_RDSEED], [
4038 AC_CACHE_CHECK([for rdseed support in assembler],
4044 AC_TRY_COMPILE(, [asm("rdseed %eax");],
4045 [ac_cv_x86_rdseed=yes], [ac_cv_x86_rdseed=no])
4048 if test $ac_cv_x86_rdseed = yes; then
4049 AC_DEFINE(_GLIBCXX_X86_RDSEED, 1,
4050 [ Defined if as can handle rdseed. ])
4055 dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS.
4057 AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [
4061 ac_save_CXXFLAGS="$CXXFLAGS"
4062 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4064 AC_CACHE_CHECK([for get_nprocs],
4065 glibcxx_cv_GET_NPROCS, [
4066 GCC_TRY_COMPILE_OR_LINK(
4067 [#include <sys/sysinfo.h>],
4068 [int n = get_nprocs();],
4069 [glibcxx_cv_GET_NPROCS=yes],
4070 [glibcxx_cv_GET_NPROCS=no])
4072 if test $glibcxx_cv_GET_NPROCS = yes; then
4073 AC_DEFINE(_GLIBCXX_USE_GET_NPROCS, 1, [Define if get_nprocs is available in <sys/sysinfo.h>.])
4076 CXXFLAGS="$ac_save_CXXFLAGS"
4081 dnl Check whether sysconf(_SC_NPROCESSORS_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROCESSORS_ONLN.
4083 AC_DEFUN([GLIBCXX_CHECK_SC_NPROCESSORS_ONLN], [
4087 ac_save_CXXFLAGS="$CXXFLAGS"
4088 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4090 AC_CACHE_CHECK([for _SC_NPROCESSORS_ONLN],
4091 glibcxx_cv_SC_NPROCESSORS_ONLN, [
4092 GCC_TRY_COMPILE_OR_LINK(
4093 [#include <unistd.h>],
4094 [int n = sysconf(_SC_NPROCESSORS_ONLN);],
4095 [glibcxx_cv_SC_NPROCESSORS_ONLN=yes],
4096 [glibcxx_cv_SC_NPROCESSORS_ONLN=no])
4098 if test $glibcxx_cv_SC_NPROCESSORS_ONLN = yes; then
4099 AC_DEFINE(_GLIBCXX_USE_SC_NPROCESSORS_ONLN, 1, [Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>.])
4102 CXXFLAGS="$ac_save_CXXFLAGS"
4107 dnl Check whether sysconf(_SC_NPROC_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROC_ONLN.
4109 AC_DEFUN([GLIBCXX_CHECK_SC_NPROC_ONLN], [
4113 ac_save_CXXFLAGS="$CXXFLAGS"
4114 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4116 AC_CACHE_CHECK([for _SC_NPROC_ONLN],
4117 glibcxx_cv_SC_NPROC_ONLN, [
4118 GCC_TRY_COMPILE_OR_LINK(
4119 [#include <unistd.h>],
4120 [int n = sysconf(_SC_NPROC_ONLN);],
4121 [glibcxx_cv_SC_NPROC_ONLN=yes],
4122 [glibcxx_cv_SC_NPROC_ONLN=no])
4124 if test $glibcxx_cv_SC_NPROC_ONLN = yes; then
4125 AC_DEFINE(_GLIBCXX_USE_SC_NPROC_ONLN, 1, [Define if _SC_NPROC_ONLN is available in <unistd.h>.])
4128 CXXFLAGS="$ac_save_CXXFLAGS"
4133 dnl Check whether pthread_num_processors_np is available in <pthread.h>, and define _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP.
4135 AC_DEFUN([GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP], [
4139 ac_save_CXXFLAGS="$CXXFLAGS"
4140 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4142 AC_CACHE_CHECK([for pthreads_num_processors_np],
4143 glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP, [
4144 GCC_TRY_COMPILE_OR_LINK(
4145 [#include <pthread.h>],
4146 [int n = pthread_num_processors_np();],
4147 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=yes],
4148 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=no])
4150 if test $glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP = yes; then
4151 AC_DEFINE(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP, 1, [Define if pthreads_num_processors_np is available in <pthread.h>.])
4154 CXXFLAGS="$ac_save_CXXFLAGS"
4159 dnl Check whether pthread_cond_clockwait is available in <pthread.h> for std::condition_variable to use,
4160 dnl and define _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT.
4162 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT], [
4166 ac_save_CXXFLAGS="$CXXFLAGS"
4167 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4168 ac_save_LIBS="$LIBS"
4169 LIBS="$LIBS -lpthread"
4171 AC_CACHE_CHECK([for pthread_cond_clockwait],
4172 glibcxx_cv_PTHREAD_COND_CLOCKWAIT, [
4173 GCC_TRY_COMPILE_OR_LINK(
4174 [#include <pthread.h>],
4175 [pthread_mutex_t mutex; pthread_cond_t cond; struct timespec ts; int n = pthread_cond_clockwait(&cond, &mutex, 0, &ts);],
4176 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=yes],
4177 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=no])
4179 if test $glibcxx_cv_PTHREAD_COND_CLOCKWAIT = yes; then
4180 AC_DEFINE(_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT, 1, [Define if pthread_cond_clockwait is available in <pthread.h>.])
4183 CXXFLAGS="$ac_save_CXXFLAGS"
4184 LIBS="$ac_save_LIBS"
4189 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4190 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4192 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK], [
4196 ac_save_CXXFLAGS="$CXXFLAGS"
4197 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4198 ac_save_LIBS="$LIBS"
4199 LIBS="$LIBS -lpthread"
4201 AC_CACHE_CHECK([for pthread_mutex_clocklock],
4202 glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK, [
4203 GCC_TRY_COMPILE_OR_LINK(
4204 [#include <pthread.h>],
4205 [pthread_mutex_t mutex; struct timespec ts; int n = pthread_mutex_clocklock(&mutex, CLOCK_REALTIME, &ts);],
4206 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=yes],
4207 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=no])
4209 if test $glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK = yes; then
4210 AC_DEFINE(_GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK, 1, [Define if pthread_mutex_clocklock is available in <pthread.h>.])
4213 CXXFLAGS="$ac_save_CXXFLAGS"
4214 LIBS="$ac_save_LIBS"
4219 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4220 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4222 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK], [
4226 ac_save_CXXFLAGS="$CXXFLAGS"
4227 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4228 ac_save_LIBS="$LIBS"
4229 LIBS="$LIBS -lpthread"
4231 AC_CACHE_CHECK([for pthread_rwlock_clockrdlock, pthread_wlock_clockwrlock],
4232 glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK, [
4233 GCC_TRY_COMPILE_OR_LINK(
4234 [#include <pthread.h>],
4235 [pthread_rwlock_t rwl; struct timespec ts;]
4236 [int n = pthread_rwlock_clockrdlock(&rwl, CLOCK_REALTIME, &ts);]
4237 [int m = pthread_rwlock_clockwrlock(&rwl, CLOCK_REALTIME, &ts);],
4238 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=yes],
4239 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=no])
4241 if test $glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK = yes; then
4242 AC_DEFINE(_GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK, 1, [Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are available in <pthread.h>.])
4245 CXXFLAGS="$ac_save_CXXFLAGS"
4246 LIBS="$ac_save_LIBS"
4251 dnl Check whether sysctl is available in <pthread.h>, and define _GLIBCXX_USE_SYSCTL_HW_NCPU.
4253 AC_DEFUN([GLIBCXX_CHECK_SYSCTL_HW_NCPU], [
4257 ac_save_CXXFLAGS="$CXXFLAGS"
4258 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4260 AC_CACHE_CHECK([for hw.ncpu sysctl],
4261 glibcxx_cv_SYSCTL_HW_NCPU, [
4262 GCC_TRY_COMPILE_OR_LINK(
4265 #include <sys/sysctl.h>
4269 size_t size = sizeof(count);
4270 int mib[] = { CTL_HW, HW_NCPU };
4271 sysctl(mib, 2, &count, &size, NULL, 0);
4273 [glibcxx_cv_SYSCTL_HW_NCPU=yes],
4274 [glibcxx_cv_SYSCTL_HW_NCPU=no])
4276 if test $glibcxx_cv_SYSCTL_HW_NCPU = yes; then
4277 AC_DEFINE(_GLIBCXX_USE_SYSCTL_HW_NCPU, 1, [Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>.])
4280 CXXFLAGS="$ac_save_CXXFLAGS"
4285 dnl Check to see if python pretty printing can be activated.
4287 dnl --with-python-dir=dir
4288 dnl installs directory into $prefix/dir
4289 AC_DEFUN([GLIBCXX_ENABLE_PYTHON], [
4291 AC_MSG_CHECKING([for custom python install directory])
4292 AC_ARG_WITH([python-dir],
4293 AS_HELP_STRING([--with-python-dir],
4294 [the location to install Python modules. This path is relative starting from the prefix.]),
4295 [with_python_dir=$withval], [with_python_dir="no"])
4296 AC_MSG_RESULT(${with_python_dir})
4298 # Needed for installing Python modules during make install.
4299 python_mod_dir="${with_python_dir}"
4300 AC_SUBST(python_mod_dir)
4301 GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
4305 dnl Check to see if -Werror is disabled.
4307 dnl --enable-werror/--disable-werror
4308 AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
4309 AC_MSG_CHECKING([for -Werror])
4310 GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
4311 AC_MSG_RESULT($enable_werror)
4312 GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
4316 dnl Check whether obsolescent tmpnam is available in <stdio.h>,
4317 dnl and define _GLIBCXX_USE_TMPNAM.
4319 AC_DEFUN([GLIBCXX_CHECK_TMPNAM], [dnl
4323 ac_save_CXXFLAGS="$CXXFLAGS"
4324 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4326 AC_CACHE_CHECK([for tmpnam], glibcxx_cv_TMPNAM, [dnl
4327 GCC_TRY_COMPILE_OR_LINK(
4328 [#include <stdio.h>],
4329 [char *tmp = tmpnam(NULL);],
4330 [glibcxx_cv_TMPNAM=yes],
4331 [glibcxx_cv_TMPNAM=no])
4333 if test $glibcxx_cv_TMPNAM = yes; then
4334 AC_DEFINE(_GLIBCXX_USE_TMPNAM, 1, [Define if obsolescent tmpnam is available in <stdio.h>.])
4337 CXXFLAGS="$ac_save_CXXFLAGS"
4342 dnl Check to see if sys/sdt.h exists and that it is suitable for use.
4343 dnl Some versions of sdt.h were not compatible with C++11.
4345 AC_DEFUN([GLIBCXX_CHECK_SDT_H], [
4346 # Note that this test has to be run with the C language.
4347 # Otherwise, sdt.h will try to include some headers from
4351 AC_CACHE_CHECK([for suitable sys/sdt.h],
4352 glibcxx_cv_sys_sdt_h, [
4353 # Because we have to run the test in C, we use grep rather
4354 # than the compiler to check for the bug. The bug is that
4355 # were strings without trailing whitespace, causing g++
4356 # to look for operator"". The pattern searches for the fixed
4358 AC_EGREP_CPP([ \",\" ], [
4359 #include <sys/sdt.h>
4360 int f() { STAP_PROBE(hi, bob); }
4361 ], [glibcxx_cv_sys_sdt_h=yes], [glibcxx_cv_sys_sdt_h=no])
4364 if test $glibcxx_cv_sys_sdt_h = yes; then
4365 AC_DEFINE(HAVE_SYS_SDT_H, 1,
4366 [Define to 1 if you have a suitable <sys/sdt.h> header file])
4371 dnl Control whether the library should define symbols for old and new ABIs.
4372 dnl This affects definitions of strings, stringstreams and locale facets.
4374 dnl --disable-libstdcxx-dual-abi will use old ABI for all types.
4377 dnl _GLIBCXX_USE_DUAL_ABI (always defined, either to 1 or 0)
4379 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_DUAL_ABI], [
4380 GLIBCXX_ENABLE(libstdcxx-dual-abi,$1,,[support two versions of std::string])
4381 if test x$enable_symvers = xgnu-versioned-namespace; then
4382 # gnu-versioned-namespace is incompatible with the dual ABI.
4383 enable_libstdcxx_dual_abi="no"
4385 if test x"$enable_libstdcxx_dual_abi" != xyes; then
4386 AC_MSG_NOTICE([dual ABI is disabled])
4387 default_libstdcxx_abi="gcc4-compatible"
4389 GLIBCXX_CONDITIONAL(ENABLE_DUAL_ABI, test $enable_libstdcxx_dual_abi = yes)
4393 dnl Check to see which ABI should be enabled by default.
4395 dnl --with-default-libstdcxx-abi={gcc4-compatible,new}
4398 dnl _GLIBCXX_USE_CXX11_ABI (always defined, either to 1 or 0)
4400 AC_DEFUN([GLIBCXX_DEFAULT_ABI], [
4401 if test x$enable_libstdcxx_dual_abi = xyes; then
4402 AC_MSG_CHECKING([for default std::string ABI to use])
4403 AC_ARG_WITH([default-libstdcxx-abi],
4404 AS_HELP_STRING([--with-default-libstdcxx-abi],
4405 [set the std::string ABI to use by default]),
4407 gcc4-compatible) default_libstdcxx_abi="gcc4-compatible" ;;
4408 new|cxx11) default_libstdcxx_abi="new" ;;
4409 c++*|gnu++*) AC_MSG_ERROR([Supported arguments for --with-default-libstdcxx-abi have changed, use "new" or "gcc4-compatible"]) ;;
4410 *) AC_MSG_ERROR([Invalid argument for --with-default-libstdcxx-abi]) ;;
4413 [default_libstdcxx_abi="new"])
4414 AC_MSG_RESULT(${default_libstdcxx_abi})
4416 if test $default_libstdcxx_abi = "new"; then
4423 AC_SUBST(glibcxx_cxx98_abi)
4424 GLIBCXX_CONDITIONAL(ENABLE_CXX11_ABI, test $glibcxx_cxx11_abi = 1)
4428 dnl Check to see whether to build libstdc++fs.a
4430 dnl --enable-libstdcxx-filesystem-ts
4432 AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
4433 GLIBCXX_ENABLE(libstdcxx-filesystem-ts,auto,,
4434 [turns on ISO/IEC TS 18822 support],
4435 [permit yes|no|auto])
4437 AC_MSG_CHECKING([whether to build Filesystem TS support])
4438 if test x"$ac_cv_header_dirent_h" != x"yes"; then
4439 enable_libstdcxx_filesystem_ts=no
4441 if test x"$enable_libstdcxx_filesystem_ts" = x"auto"; then
4442 case "${target_os}" in
4443 freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
4444 enable_libstdcxx_filesystem_ts=yes
4446 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
4447 enable_libstdcxx_filesystem_ts=yes
4450 enable_libstdcxx_filesystem_ts=yes
4453 enable_libstdcxx_filesystem_ts=yes
4456 enable_libstdcxx_filesystem_ts=yes
4459 enable_libstdcxx_filesystem_ts=no
4463 AC_MSG_RESULT($enable_libstdcxx_filesystem_ts)
4464 GLIBCXX_CONDITIONAL(ENABLE_FILESYSTEM_TS, test $enable_libstdcxx_filesystem_ts = yes)
4468 dnl Check whether the library calls required by the C++17 Filesystem library
4469 dnl and the Filesystem TS are present.
4471 dnl HAVE_STRUCT_DIRENT_D_TYPE
4472 dnl _GLIBCXX_USE_REALPATH
4473 dnl _GLIBCXX_USE_UTIMENSAT
4474 dnl _GLIBCXX_USE_ST_MTIM
4475 dnl _GLIBCXX_USE_FCHMOD
4476 dnl _GLIBCXX_USE_FCHMODAT
4477 dnl _GLIBCXX_USE_SENDFILE
4482 AC_DEFUN([GLIBCXX_CHECK_FILESYSTEM_DEPS], [dnl
4486 ac_save_CXXFLAGS="$CXXFLAGS"
4487 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4489 AC_CACHE_CHECK([for struct dirent.d_type], glibcxx_cv_dirent_d_type, [dnl
4490 GCC_TRY_COMPILE_OR_LINK(
4491 [#include <dirent.h>],
4494 if (sizeof d.d_type) return 0;
4496 [glibcxx_cv_dirent_d_type=yes],
4497 [glibcxx_cv_dirent_d_type=no])
4499 if test $glibcxx_cv_dirent_d_type = yes; then
4500 AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE, 1, [Define to 1 if `d_type' is a member of `struct dirent'.])
4503 AC_CACHE_CHECK([for realpath], glibcxx_cv_realpath, [dnl
4504 GCC_TRY_COMPILE_OR_LINK(
4511 #if _XOPEN_VERSION < 500
4513 #elif _XOPEN_VERSION >= 700 || defined(PATH_MAX)
4514 char *tmp = realpath((const char*)NULL, (char*)NULL);
4519 [glibcxx_cv_realpath=yes],
4520 [glibcxx_cv_realpath=no])
4522 if test $glibcxx_cv_realpath = yes; then
4523 AC_DEFINE(_GLIBCXX_USE_REALPATH, 1, [Define if usable realpath is available in <stdlib.h>.])
4526 AC_CACHE_CHECK([for utimensat], glibcxx_cv_utimensat, [dnl
4527 GCC_TRY_COMPILE_OR_LINK(
4530 #include <sys/stat.h>
4533 struct timespec ts[2] = { { 0, UTIME_OMIT }, { 1, 1 } };
4534 int i = utimensat(AT_FDCWD, "path", ts, 0);
4536 [glibcxx_cv_utimensat=yes],
4537 [glibcxx_cv_utimensat=no])
4539 if test $glibcxx_cv_utimensat = yes; then
4540 AC_DEFINE(_GLIBCXX_USE_UTIMENSAT, 1, [Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and AT_FDCWD in <fcntl.h>.])
4543 AC_CACHE_CHECK([for utime], glibcxx_cv_utime, [dnl
4544 GCC_TRY_COMPILE_OR_LINK(
4549 struct utimbuf t = { 1, 1 };
4550 int i = utime("path", &t);
4552 [glibcxx_cv_utime=yes],
4553 [glibcxx_cv_utime=no])
4555 if test $glibcxx_cv_utime = yes; then
4556 AC_DEFINE(_GLIBCXX_USE_UTIME, 1, [Define if utime is available in <utime.h>.])
4559 AC_CACHE_CHECK([for lstat], glibcxx_cv_lstat, [dnl
4560 GCC_TRY_COMPILE_OR_LINK(
4561 [ #include <sys/stat.h> ],
4564 int i = lstat("path", &st);
4566 [glibcxx_cv_lstat=yes],
4567 [glibcxx_cv_lstat=no])
4569 if test $glibcxx_cv_lstat = yes; then
4570 AC_DEFINE(_GLIBCXX_USE_LSTAT, 1, [Define if lstat is available in <sys/stat.h>.])
4573 AC_CACHE_CHECK([for struct stat.st_mtim.tv_nsec],
4574 glibcxx_cv_st_mtim, [dnl
4575 GCC_TRY_COMPILE_OR_LINK(
4576 [ #include <sys/stat.h> ],
4579 return st.st_mtim.tv_nsec;
4581 [glibcxx_cv_st_mtim=yes],
4582 [glibcxx_cv_st_mtim=no])
4584 if test $glibcxx_cv_st_mtim = yes; then
4585 AC_DEFINE(_GLIBCXX_USE_ST_MTIM, 1, [Define if struct stat has timespec members.])
4588 AC_CACHE_CHECK([for fchmod],
4589 glibcxx_cv_fchmod, [dnl
4590 GCC_TRY_COMPILE_OR_LINK(
4591 [#include <sys/stat.h>],
4592 [fchmod(1, S_IWUSR);],
4593 [glibcxx_cv_fchmod=yes],
4594 [glibcxx_cv_fchmod=no])
4596 if test $glibcxx_cv_fchmod = yes; then
4597 AC_DEFINE(_GLIBCXX_USE_FCHMOD, 1, [Define if fchmod is available in <sys/stat.h>.])
4600 AC_CACHE_CHECK([for fchmodat],
4601 glibcxx_cv_fchmodat, [dnl
4602 GCC_TRY_COMPILE_OR_LINK(
4605 #include <sys/stat.h>
4607 [fchmodat(AT_FDCWD, "", 0, AT_SYMLINK_NOFOLLOW);],
4608 [glibcxx_cv_fchmodat=yes],
4609 [glibcxx_cv_fchmodat=no])
4611 if test $glibcxx_cv_fchmodat = yes; then
4612 AC_DEFINE(_GLIBCXX_USE_FCHMODAT, 1, [Define if fchmodat is available in <sys/stat.h>.])
4615 AC_CACHE_CHECK([for sendfile that can copy files],
4616 glibcxx_cv_sendfile, [dnl
4617 case "${target_os}" in
4618 gnu* | linux* | solaris* | uclinux*)
4619 GCC_TRY_COMPILE_OR_LINK(
4620 [#include <sys/sendfile.h>],
4621 [sendfile(1, 2, (off_t*)0, sizeof 1);],
4622 [glibcxx_cv_sendfile=yes],
4623 [glibcxx_cv_sendfile=no])
4626 glibcxx_cv_sendfile=no
4630 if test $glibcxx_cv_sendfile = yes; then
4631 AC_DEFINE(_GLIBCXX_USE_SENDFILE, 1, [Define if sendfile is available in <sys/sendfile.h>.])
4634 AC_CACHE_CHECK([for link],
4635 glibcxx_cv_link, [dnl
4636 GCC_TRY_COMPILE_OR_LINK(
4637 [#include <unistd.h>],
4639 [glibcxx_cv_link=yes],
4640 [glibcxx_cv_link=no])
4642 if test $glibcxx_cv_link = yes; then
4643 AC_DEFINE(HAVE_LINK, 1, [Define if link is available in <unistd.h>.])
4646 AC_CACHE_CHECK([for readlink],
4647 glibcxx_cv_readlink, [dnl
4648 GCC_TRY_COMPILE_OR_LINK(
4649 [#include <unistd.h>],
4650 [char buf[32]; readlink("", buf, sizeof(buf));],
4651 [glibcxx_cv_readlink=yes],
4652 [glibcxx_cv_readlink=no])
4654 if test $glibcxx_cv_readlink = yes; then
4655 AC_DEFINE(HAVE_READLINK, 1, [Define if readlink is available in <unistd.h>.])
4658 AC_CACHE_CHECK([for symlink],
4659 glibcxx_cv_symlink, [dnl
4660 GCC_TRY_COMPILE_OR_LINK(
4661 [#include <unistd.h>],
4663 [glibcxx_cv_symlink=yes],
4664 [glibcxx_cv_symlink=no])
4666 if test $glibcxx_cv_symlink = yes; then
4667 AC_DEFINE(HAVE_SYMLINK, 1, [Define if symlink is available in <unistd.h>.])
4670 AC_CACHE_CHECK([for truncate],
4671 glibcxx_cv_truncate, [dnl
4672 GCC_TRY_COMPILE_OR_LINK(
4673 [#include <unistd.h>],
4674 [truncate("", 99);],
4675 [glibcxx_cv_truncate=yes],
4676 [glibcxx_cv_truncate=no])
4678 if test $glibcxx_cv_truncate = yes; then
4679 AC_DEFINE(HAVE_TRUNCATE, 1, [Define if truncate is available in <unistd.h>.])
4682 CXXFLAGS="$ac_save_CXXFLAGS"
4687 dnl Check how size_t is mangled. Copied from libitm.
4689 AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
4690 AC_CACHE_CHECK([how size_t is mangled],
4691 glibcxx_cv_size_t_mangling, [
4692 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
4693 [glibcxx_cv_size_t_mangling=m], [
4694 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
4695 [glibcxx_cv_size_t_mangling=j], [
4697 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
4698 [glibcxx_cv_size_t_mangling=y], [
4700 [extern __SIZE_TYPE__ x; extern unsigned short x;],
4701 [glibcxx_cv_size_t_mangling=t], [
4703 [extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
4704 [glibcxx_cv_size_t_mangling=u6uint20],
4705 [glibcxx_cv_size_t_mangling=x])
4711 if test $glibcxx_cv_size_t_mangling = x; then
4712 AC_MSG_ERROR([Unknown underlying type for size_t])
4714 AC_DEFINE_UNQUOTED(_GLIBCXX_MANGLE_SIZE_T, [$glibcxx_cv_size_t_mangling],
4715 [Define to the letter to which size_t is mangled.])
4719 dnl Determine whether std::exception_ptr symbols should be exported with
4720 dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
4721 dnl release first added support for std::exception_ptr. Originally it was
4722 dnl only supported for targets with always-lock-free atomics for int, but
4723 dnl since GCC 7.1 it is supported for all targets.
4725 AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
4726 if test $enable_symvers != no; then
4727 AC_MSG_CHECKING([for first version to support std::exception_ptr])
4729 aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
4730 m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
4731 ac_exception_ptr_since_gcc46=yes
4734 # If the value of this macro changes then we will need to hardcode
4735 # yes/no here for additional targets based on the original value.
4736 AC_TRY_COMPILE([], [
4737 #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
4738 # error atomic int not always lock free
4741 [ac_exception_ptr_since_gcc46=yes],
4742 [ac_exception_ptr_since_gcc46=no])
4745 if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
4746 AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
4747 [Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
4748 AC_MSG_RESULT([4.6.0])
4750 AC_MSG_RESULT([7.1.0])
4756 dnl Check whether getentropy is present in <unistd.h>.
4758 AC_DEFUN([GLIBCXX_CHECK_GETENTROPY], [
4762 AC_CACHE_CHECK([for getentropy], glibcxx_cv_getentropy, [
4763 GCC_TRY_COMPILE_OR_LINK(
4764 [#include <unistd.h>],
4766 ::getentropy(&i, sizeof(i));],
4767 [glibcxx_cv_getentropy=yes], [glibcxx_cv_getentropy=no])
4770 if test $glibcxx_cv_getentropy = yes; then
4771 AC_DEFINE(HAVE_GETENTROPY, 1, [Define if getentropy is available in <unistd.h>.])
4777 dnl Check whether arc4random is present in <stdlib.h>.
4779 AC_DEFUN([GLIBCXX_CHECK_ARC4RANDOM], [
4783 AC_CACHE_CHECK([for arc4random], glibcxx_cv_arc4random, [
4784 GCC_TRY_COMPILE_OR_LINK(
4785 [#include <stdlib.h>],
4786 [unsigned i = ::arc4random();],
4787 [glibcxx_cv_arc4random=yes], [glibcxx_cv_arc4random=no])
4790 if test $glibcxx_cv_arc4random = yes; then
4791 AC_DEFINE(HAVE_ARC4RANDOM, 1, [Define if arc4random is available in <stdlib.h>.])
4797 # Macros from the top-level gcc directory.
4798 m4_include([../config/gc++filt.m4])
4799 m4_include([../config/tls.m4])
4800 m4_include([../config/gthr.m4])
4801 m4_include([../config/cet.m4])