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 $host.
36 dnl glibcxx_builddir (absolute path)
37 dnl glibcxx_srcdir (absolute path)
38 dnl toplevel_builddir (absolute path)
39 dnl toplevel_srcdir (absolute path)
42 dnl with_target_subdir
44 dnl - the variables in GLIBCXX_CHECK_HOST / configure.host
45 dnl - default settings for all AM_CONFITIONAL test variables
46 dnl - lots of tools, like CC and CXX
48 AC_DEFUN([GLIBCXX_CONFIGURE], [
49 # Keep these sync'd with the list in Makefile.am. The first provides an
50 # expandable list at autoconf time; the second provides an expandable list
51 # (i.e., shell variable) at configure time.
52 m4_define([glibcxx_SUBDIRS],[include libsupc++ src src/c++98 src/c++11 src/c++17 src/c++20 src/filesystem src/libbacktrace src/experimental doc po testsuite python])
53 SUBDIRS='glibcxx_SUBDIRS'
55 # These need to be absolute paths, yet at the same time need to
56 # canonicalize only relative paths, because then amd will not unmount
57 # drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
58 glibcxx_builddir=`${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_ld_is_mold (set to "no" or "yes")
176 dnl glibcxx_gnu_ld_version (possibly)
178 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
179 dnl set glibcxx_gnu_ld_version to 12345. Zeros cause problems.
181 AC_DEFUN([GLIBCXX_CHECK_LINKER_FEATURES], [
182 # If we're not using GNU ld, then there's no point in even trying these
183 # tests. Check for that first. We should have already tested for gld
184 # by now (in libtool), but require it now just to be safe...
185 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
186 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
187 AC_REQUIRE([AC_PROG_LD])
188 AC_REQUIRE([AC_PROG_AWK])
190 # The name set by libtool depends on the version of libtool. Shame on us
191 # for depending on an impl detail, but c'est la vie. Older versions used
192 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
193 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
194 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
195 # set (hence we're using an older libtool), then set it.
196 if test x${with_gnu_ld+set} != xset; then
197 if test x${ac_cv_prog_gnu_ld+set} != xset; then
198 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
201 with_gnu_ld=$ac_cv_prog_gnu_ld
205 # Start by getting the version number. I think the libtool test already
206 # does some of this, but throws away the result.
207 glibcxx_ld_is_gold=no
208 glibcxx_ld_is_mold=no
209 if test x"$with_gnu_ld" = x"yes"; then
210 AC_MSG_CHECKING([for ld version])
212 if $LD --version 2>/dev/null | grep 'GNU gold' >/dev/null 2>&1; then
213 glibcxx_ld_is_gold=yes
214 elif $LD --version 2>/dev/null | grep 'mold' >/dev/null 2>&1; then
215 glibcxx_ld_is_mold=yes
217 ldver=`$LD --version 2>/dev/null |
218 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
220 glibcxx_gnu_ld_version=`echo $ldver | \
221 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
222 AC_MSG_RESULT($glibcxx_gnu_ld_version)
226 glibcxx_have_gc_sections=no
227 if test "$glibcxx_ld_is_gold" = "yes" || test "$glibcxx_ld_is_mold" = "yes" ; then
228 if $LD --help 2>/dev/null | grep gc-sections >/dev/null 2>&1; then
229 glibcxx_have_gc_sections=yes
232 glibcxx_gcsections_min_ld=21602
233 if test x"$with_gnu_ld" = x"yes" &&
234 test $glibcxx_gnu_ld_version -gt $glibcxx_gcsections_min_ld ; then
235 glibcxx_have_gc_sections=yes
238 if test "$glibcxx_have_gc_sections" = "yes"; then
239 # Sufficiently young GNU ld it is! Joy and bunny rabbits!
240 # NB: This flag only works reliably after 2.16.1. Configure tests
241 # for this are difficult, so hard wire a value that should work.
243 ac_test_CFLAGS="${CFLAGS+set}"
244 ac_save_CFLAGS="$CFLAGS"
245 CFLAGS='-Wl,--gc-sections'
247 # Check for -Wl,--gc-sections
248 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
249 AC_TRY_LINK([ int one(void) { return 1; }
250 int two(void) { return 2; }
251 ], [ two(); ] , [ac_gcsections=yes], [ac_gcsections=no])
252 if test "$ac_gcsections" = "yes"; then
255 if $CC -c conftest.c; then
256 if $LD --gc-sections -o conftest conftest.o 2>&1 | \
257 grep "Warning: gc-sections option ignored" > /dev/null; then
261 rm -f conftest.c conftest.o conftest
263 if test "$ac_gcsections" = "yes"; then
264 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
266 AC_MSG_RESULT($ac_gcsections)
268 if test "$ac_test_CFLAGS" = set; then
269 CFLAGS="$ac_save_CFLAGS"
271 # this is the suspicious part
277 # Note this is only for shared objects.
279 if test x"$with_gnu_ld" = x"yes"; then
280 # cygwin and mingw uses PE, which has no ELF relro support,
281 # multi target ld may confuse configure machinery
288 AC_MSG_CHECKING([for ld that supports -Wl,-z,relro])
289 cxx_z_relo=`$LD -v --help 2>/dev/null | grep "z relro"`
290 if test -n "$cxx_z_relo"; then
291 OPT_LDFLAGS="-Wl,-z,relro"
294 AC_MSG_RESULT($ac_ld_relro)
298 # Set linker optimization flags.
299 if test x"$with_gnu_ld" = x"yes"; then
300 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
303 AC_SUBST(SECTION_LDFLAGS)
304 AC_SUBST(OPT_LDFLAGS)
309 dnl Check for headers for, and arguments to, the setrlimit() function.
310 dnl Used only in testsuite_hooks.h. Called from GLIBCXX_CONFIGURE_TESTSUITE.
313 dnl _GLIBCXX_RES_LIMITS if we can set artificial resource limits
314 dnl various HAVE_LIMIT_* for individual limit names
316 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT_ancilliary], [
317 AC_MSG_CHECKING([for RLIMIT_$1])
320 #include <sys/time.h>
321 #include <sys/resource.h>
323 [ int f = RLIMIT_$1 ; ],
324 [glibcxx_mresult=1], [glibcxx_mresult=0])
325 AC_DEFINE_UNQUOTED(HAVE_LIMIT_$1, $glibcxx_mresult,
326 [Only used in build directory testsuite_hooks.h.])
327 if test $glibcxx_mresult = 1 ; then res=yes ; else res=no ; fi
331 AC_DEFUN([GLIBCXX_CHECK_SETRLIMIT], [
334 setrlimit_have_headers=yes
335 AC_CHECK_HEADERS(unistd.h sys/time.h sys/resource.h,
337 [setrlimit_have_headers=no])
338 # If don't have the headers, then we can't run the tests now, and we
339 # won't be seeing any of these during testsuite compilation.
340 if test $setrlimit_have_headers = yes; then
341 # Can't do these in a loop, else the resulting syntax is wrong.
342 GLIBCXX_CHECK_SETRLIMIT_ancilliary(DATA)
343 GLIBCXX_CHECK_SETRLIMIT_ancilliary(RSS)
344 GLIBCXX_CHECK_SETRLIMIT_ancilliary(VMEM)
345 GLIBCXX_CHECK_SETRLIMIT_ancilliary(AS)
346 GLIBCXX_CHECK_SETRLIMIT_ancilliary(FSIZE)
348 # Check for rlimit, setrlimit.
349 AC_CACHE_CHECK([for testsuite resource limits support],
350 glibcxx_cv_setrlimit, [
353 #include <sys/time.h>
354 #include <sys/resource.h>
358 [glibcxx_cv_setrlimit=yes], [glibcxx_cv_setrlimit=no])
361 if test $glibcxx_cv_setrlimit = yes; then
362 AC_DEFINE(_GLIBCXX_RES_LIMITS, 1,
363 [Define if using setrlimit to set resource limits during
372 dnl Check whether S_ISREG (Posix) or S_IFREG is available in <sys/stat.h>.
373 dnl Define HAVE_S_ISREG / HAVE_S_IFREG appropriately.
375 AC_DEFUN([GLIBCXX_CHECK_S_ISREG_OR_S_IFREG], [
379 ac_save_CXXFLAGS="$CXXFLAGS"
380 CXXFLAGS="$CXXFLAGS -fno-exceptions"
382 AC_MSG_CHECKING([for S_ISREG or S_IFREG])
383 AC_CACHE_VAL(glibcxx_cv_S_ISREG, [
384 GCC_TRY_COMPILE_OR_LINK(
385 [#include <sys/stat.h>],
388 S_ISREG(buffer.st_mode);],
389 [glibcxx_cv_S_ISREG=yes],
390 [glibcxx_cv_S_ISREG=no])
392 AC_CACHE_VAL(glibcxx_cv_S_IFREG, [
393 GCC_TRY_COMPILE_OR_LINK(
394 [#include <sys/stat.h>],
397 S_IFREG & buffer.st_mode;],
398 [glibcxx_cv_S_IFREG=yes],
399 [glibcxx_cv_S_IFREG=no])
402 if test $glibcxx_cv_S_ISREG = yes; then
403 AC_DEFINE(HAVE_S_ISREG, 1,
404 [Define if S_ISREG is available in <sys/stat.h>.])
406 elif test $glibcxx_cv_S_IFREG = yes; then
407 AC_DEFINE(HAVE_S_IFREG, 1,
408 [Define if S_IFREG is available in <sys/stat.h>.])
413 CXXFLAGS="$ac_save_CXXFLAGS"
419 dnl Check whether poll is available in <poll.h>, and define HAVE_POLL.
421 AC_DEFUN([GLIBCXX_CHECK_POLL], [
425 ac_save_CXXFLAGS="$CXXFLAGS"
426 CXXFLAGS="$CXXFLAGS -fno-exceptions"
428 AC_CACHE_CHECK([for poll], glibcxx_cv_POLL, [
429 GCC_TRY_COMPILE_OR_LINK(
431 [struct pollfd pfd[1];
432 pfd[0].events = POLLIN;
434 [glibcxx_cv_POLL=yes],
435 [glibcxx_cv_POLL=no])
437 if test $glibcxx_cv_POLL = yes; then
438 AC_DEFINE(HAVE_POLL, 1, [Define if poll is available in <poll.h>.])
441 CXXFLAGS="$ac_save_CXXFLAGS"
447 dnl Check whether writev is available in <sys/uio.h>, and define HAVE_WRITEV.
449 AC_DEFUN([GLIBCXX_CHECK_WRITEV], [
453 ac_save_CXXFLAGS="$CXXFLAGS"
454 CXXFLAGS="$CXXFLAGS -fno-exceptions"
456 AC_CACHE_CHECK([for writev], glibcxx_cv_WRITEV, [
457 GCC_TRY_COMPILE_OR_LINK(
458 [#include <sys/uio.h>],
459 [struct iovec iov[2];
461 [glibcxx_cv_WRITEV=yes],
462 [glibcxx_cv_WRITEV=no])
464 if test $glibcxx_cv_WRITEV = yes; then
465 AC_DEFINE(HAVE_WRITEV, 1, [Define if writev is available in <sys/uio.h>.])
468 CXXFLAGS="$ac_save_CXXFLAGS"
474 dnl Check whether LFS support is available.
476 AC_DEFUN([GLIBCXX_CHECK_LFS], [
479 ac_save_CXXFLAGS="$CXXFLAGS"
480 CXXFLAGS="$CXXFLAGS -fno-exceptions"
481 AC_CACHE_CHECK([for LFS support], glibcxx_cv_LFS, [
482 GCC_TRY_COMPILE_OR_LINK(
485 #include <sys/stat.h>
489 fseeko64(fp, 0, SEEK_CUR);
491 lseek64(1, 0, SEEK_CUR);
494 [glibcxx_cv_LFS=yes],
497 if test $glibcxx_cv_LFS = yes; then
498 AC_DEFINE(_GLIBCXX_USE_LFS, 1, [Define if LFS support is available.])
500 CXXFLAGS="$ac_save_CXXFLAGS"
506 dnl Check whether the old Copy-On-Write basic_string should allocate a new
507 dnl empty representation for every default-constructed basic_string. Without
508 dnl this option, COW strings share a single empty rep in static storage,
509 dnl but this only works if the linker can guarantee the static storage has
510 dnl a unique definition in the process. It also doesn't work if basic_string
511 dnl objects are stored in shared memory (see PR libstdc++/16612).
512 dnl When fully dynamic strings are enabled, the static storage is not used
513 dnl and a new empty string with reference-count == 1 is allocated each time.
514 dnl Enabling this changes the libstdc++.so ABI.
516 dnl --enable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 1
517 dnl --disable-fully-dynamic-string defines _GLIBCXX_FULLY_DYNAMIC_STRING to 0
518 dnl otherwise the macro is not defined.
519 dnl + Usage: GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING[(DEFAULT)]
520 dnl Where DEFAULT is either `yes' or `no'.
522 AC_DEFUN([GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING], [
523 GLIBCXX_ENABLE(fully-dynamic-string,$1,,[do not put empty strings in per-process static memory], [permit yes|no])
524 if test $enable_fully_dynamic_string = yes; then
525 enable_fully_dynamic_string_def=1
527 enable_fully_dynamic_string_def=0
529 AC_DEFINE_UNQUOTED([_GLIBCXX_FULLY_DYNAMIC_STRING], [${enable_fully_dynamic_string_def}],
530 [Define to 1 if a fully dynamic basic_string is wanted, 0 to disable, undefined for platform defaults])
535 dnl Does any necessary configuration of the testsuite directory. Generates
536 dnl the testsuite_hooks.h header.
538 dnl GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE must be done before this.
542 dnl GLIBCXX_TEST_WCHAR_T
543 dnl GLIBCXX_TEST_THREAD
546 dnl baseline_subdir_switch
548 AC_DEFUN([GLIBCXX_CONFIGURE_TESTSUITE], [
549 # Do checks for resource limit functions.
550 GLIBCXX_CHECK_SETRLIMIT
552 if $GLIBCXX_IS_NATIVE ; then
553 # Look for setenv, so that extended locale tests can be performed.
554 GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_3(setenv)
557 if $GLIBCXX_IS_NATIVE && test $is_hosted = yes &&
558 test $enable_symvers != no; then
561 enable_abi_check=no ;;
563 enable_abi_check=yes ;;
566 # Only build this as native, since automake does not understand
571 # Export file names for ABI checking.
572 baseline_dir="$glibcxx_srcdir/config/abi/post/${abi_baseline_pair}"
573 AC_SUBST(baseline_dir)
574 baseline_subdir_switch="$abi_baseline_subdir_switch"
575 AC_SUBST(baseline_subdir_switch)
580 dnl Does any necessary configuration for docbook in the docs directory.
582 dnl XSLTPROC must be set before this
585 dnl glibcxx_stylesheets
589 AC_DEFUN([GLIBCXX_CONFIGURE_DOCBOOK], [
591 glibcxx_docbook_url=http://docbook.sourceforge.net/release/xsl-ns/current/
593 AC_MSG_CHECKING([for local stylesheet directory])
594 glibcxx_local_stylesheets=no
595 if test x${XMLCATALOG} = xyes && xsl_style_dir=`xmlcatalog "" $glibcxx_docbook_url 2>/dev/null`
597 XSL_STYLE_DIR=`echo $xsl_style_dir | sed -n 's;^file://;;p'`
598 glibcxx_local_stylesheets=yes
601 /usr/share/sgml/docbook/xsl-ns-stylesheets \
602 /usr/share/xml/docbook/stylesheet/docbook-xsl-ns \
603 /usr/share/xml/docbook/stylesheet/nwalsh5/current \
604 /usr/share/xml/docbook/stylesheet/nwalsh/current
606 if test -d $dir; then
607 glibcxx_local_stylesheets=yes
613 AC_MSG_RESULT($glibcxx_local_stylesheets)
615 if test x"$glibcxx_local_stylesheets" = x"yes"; then
616 AC_SUBST(XSL_STYLE_DIR)
617 AC_MSG_NOTICE($XSL_STYLE_DIR)
619 AC_MSG_CHECKING([for docbook stylesheets for documentation creation])
620 glibcxx_stylesheets=no
621 if test x${XMLCATALOG} = xno || xmlcatalog "" $glibcxx_docbook_url/xhtml/docbook.xsl >/dev/null 2>&1; then
622 if test x${XSLTPROC} = xyes && echo '<title/>' | xsltproc --noout --nonet --xinclude $glibcxx_docbook_url/xhtml/docbook.xsl - 2>/dev/null; then
623 glibcxx_stylesheets=yes
626 AC_MSG_RESULT($glibcxx_stylesheets)
629 glibcxx_stylesheets=no
632 # Check for epub3 dependencies.
633 AC_MSG_CHECKING([for epub3 stylesheets for documentation creation])
634 glibcxx_epub_stylesheets=no
635 if test x"$glibcxx_local_stylesheets" = x"yes"; then
636 if test -f "$XSL_STYLE_DIR/epub3/chunk.xsl"; then
637 glibcxx_epub_stylesheets=yes
640 AC_MSG_RESULT($glibcxx_epub_stylesheets)
641 AM_CONDITIONAL(BUILD_EPUB, test x"$glibcxx_epub_stylesheets" = x"yes")
647 dnl Set up *_INCLUDES variables for all sundry Makefile.am's.
651 dnl TOPLEVEL_INCLUDES
653 AC_DEFUN([GLIBCXX_EXPORT_INCLUDES], [
654 # Used for every C++ compile we perform.
656 -I$glibcxx_builddir/include/$host_alias \
657 -I$glibcxx_builddir/include \
658 -I$glibcxx_srcdir/libsupc++"
660 # For Canadian crosses, pick this up too.
661 if test $CANADIAN = yes; then
662 GLIBCXX_INCLUDES="$GLIBCXX_INCLUDES -I\${includedir}"
665 # Stuff in the actual top level. Currently only used by libsupc++ to
666 # get unwind* headers from the libgcc dir.
667 #TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc -I$(toplevel_srcdir)/include'
668 TOPLEVEL_INCLUDES='-I$(toplevel_srcdir)/libgcc'
670 # Now, export this to all the little Makefiles....
671 AC_SUBST(GLIBCXX_INCLUDES)
672 AC_SUBST(TOPLEVEL_INCLUDES)
677 dnl Set up *_FLAGS and *FLAGS variables for all sundry Makefile.am's.
678 dnl (SECTION_FLAGS is done under CHECK_COMPILER_FEATURES.)
682 dnl OPTIMIZE_CXXFLAGS
685 AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
688 # Optimization flags that are probably a good idea for thrill-seekers. Just
689 # uncomment the lines below and make, everything else is ready to go...
690 # Alternatively OPTIMIZE_CXXFLAGS can be set in configure.host.
691 # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
692 AC_SUBST(OPTIMIZE_CXXFLAGS)
694 WARN_FLAGS="-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2"
700 dnl All installation directory information is determined here.
704 dnl glibcxx_prefixdir
705 dnl glibcxx_toolexecdir
706 dnl glibcxx_toolexeclibdir
708 dnl Assumes cross_compiling bits already done, and with_cross_host in
711 dnl This logic must match gcc/configure.ac's setting of gcc_gxx_include_dir.
712 dnl config/gxx-include-dir.m4 must be kept consistant with this as well.
713 AC_DEFUN([GLIBCXX_EXPORT_INSTALL_INFO], [
714 glibcxx_toolexecdir=no
715 glibcxx_toolexeclibdir=no
716 glibcxx_prefixdir=$prefix
718 AC_MSG_CHECKING([for gxx-include-dir])
719 AC_ARG_WITH([gxx-include-dir],
720 AC_HELP_STRING([--with-gxx-include-dir=DIR],
721 [installation directory for include files]),
723 yes) AC_MSG_ERROR([Missing directory for --with-gxx-include-dir]) ;;
724 no) gxx_include_dir=no ;;
725 *) gxx_include_dir=$withval ;;
727 [gxx_include_dir=no])
728 AC_MSG_RESULT($gxx_include_dir)
730 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
731 AC_ARG_ENABLE([version-specific-runtime-libs],
732 AC_HELP_STRING([--enable-version-specific-runtime-libs],
733 [Specify that runtime libraries should be installed in a compiler-specific directory]),
734 [case "$enableval" in
735 yes) version_specific_libs=yes ;;
736 no) version_specific_libs=no ;;
737 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
739 [version_specific_libs=no])
740 AC_MSG_RESULT($version_specific_libs)
742 GCC_WITH_TOOLEXECLIBDIR
744 # Default case for install directory for include files.
745 if test $version_specific_libs = no && test $gxx_include_dir = no; then
746 gxx_include_dir='include/c++/${gcc_version}'
747 if test -n "$with_cross_host" &&
748 test x"$with_cross_host" != x"no"; then
749 gxx_include_dir='${prefix}/${target_alias}/'"$gxx_include_dir"
751 gxx_include_dir='${prefix}/'"$gxx_include_dir"
755 # Version-specific runtime libs processing.
756 if test $version_specific_libs = yes; then
757 # Need the gcc compiler version to know where to install libraries
758 # and header files if --enable-version-specific-runtime-libs option
759 # is selected. FIXME: these variables are misnamed, there are
760 # no executables installed in _toolexecdir or _toolexeclibdir.
761 if test x"$gxx_include_dir" = x"no"; then
762 gxx_include_dir='${libdir}/gcc/${host_alias}/${gcc_version}/include/c++'
764 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
765 glibcxx_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
768 # Calculate glibcxx_toolexecdir, glibcxx_toolexeclibdir
769 # Install a library built with a cross compiler in tooldir, not libdir.
770 if test x"$glibcxx_toolexecdir" = x"no"; then
771 if test -n "$with_cross_host" &&
772 test x"$with_cross_host" != x"no"; then
773 glibcxx_toolexecdir='${exec_prefix}/${host_alias}'
774 case ${with_toolexeclibdir} in
776 glibcxx_toolexeclibdir='${toolexecdir}/lib'
779 glibcxx_toolexeclibdir=${with_toolexeclibdir}
783 glibcxx_toolexecdir='${libdir}/gcc/${host_alias}'
784 glibcxx_toolexeclibdir='${libdir}'
786 multi_os_directory=`$CXX -print-multi-os-directory`
787 case $multi_os_directory in
788 .) ;; # Avoid trailing /.
789 *) glibcxx_toolexeclibdir=$glibcxx_toolexeclibdir/$multi_os_directory ;;
793 AC_MSG_CHECKING([for install location])
794 AC_MSG_RESULT($gxx_include_dir)
796 AC_SUBST(glibcxx_prefixdir)
797 AC_SUBST(gxx_include_dir)
798 AC_SUBST(glibcxx_toolexecdir)
799 AC_SUBST(glibcxx_toolexeclibdir)
805 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
806 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
807 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
809 dnl See manual/appendix_porting.html#appendix.porting.build_hacking for
812 m4_define([GLIBCXX_ENABLE],[dnl
813 m4_define([_g_switch],[--enable-$1])dnl
814 m4_define([_g_help],[AC_HELP_STRING([_g_switch$3],[$4 @<:@default=$2@:>@])])dnl
815 AC_ARG_ENABLE([$1],m4_dquote(_g_help),
820 m4_bpatsubst([$5],[permit ])) ;;
821 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
822 dnl Idea for future: generate a URL pointing to
823 dnl "onlinedocs/configopts.html#whatever"
830 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
834 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
835 m4_undefine([_g_switch])dnl
836 m4_undefine([_g_help])dnl
841 dnl Check for ISO/IEC 9899:1999 "C99" support.
843 dnl --enable-c99 defines _GLIBCXX_USE_C99
844 dnl --disable-c99 leaves _GLIBCXX_USE_C99 undefined
845 dnl + Usage: GLIBCXX_ENABLE_C99[(DEFAULT)]
846 dnl Where DEFAULT is either `yes' or `no'.
847 dnl + If 'C99' stuff is not available, ignores DEFAULT and sets `no'.
849 AC_DEFUN([GLIBCXX_ENABLE_C99], [
850 GLIBCXX_ENABLE(c99,$1,,[turns on ISO/IEC 9899:1999 support])
852 if test x"$enable_c99" = x"yes"; then
856 # Use -std=c++98 (instead of -std=gnu++98) because leaving __STRICT_ANSI__
857 # undefined may cause fake C99 facilities, like pre-standard snprintf,
858 # to be spuriously enabled.
859 ac_save_CXXFLAGS="$CXXFLAGS"
860 CXXFLAGS="$CXXFLAGS -std=c++98"
862 ac_save_gcc_no_link="$gcc_no_link"
864 if test x$gcc_no_link != xyes; then
865 # Use -fno-exceptions to that the C driver can link these tests without
866 # hitting undefined references to personality routines.
867 CXXFLAGS="$CXXFLAGS -fno-exceptions"
868 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
869 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
874 # Check for the existence of <math.h> functions used if C99 is enabled.
875 AC_CACHE_CHECK([for ISO C99 support in <math.h> for C++98],
876 glibcxx_cv_c99_math_cxx98, [
877 GCC_TRY_COMPILE_OR_LINK(
879 volatile double d1, d2;
887 i = isgreater(d1, d2);
888 i = isgreaterequal(d1, d2);
890 i = islessequal(d1, d2);
891 i = islessgreater(d1, d2);
892 i = islessgreater(d1, d2);
893 i = isunordered(d1, d2);
894 ], [glibcxx_cv_c99_math_cxx98=yes], [glibcxx_cv_c99_math_cxx98=no])
896 if test x"$glibcxx_cv_c99_math_cxx98" = x"yes"; then
897 AC_DEFINE(_GLIBCXX98_USE_C99_MATH, 1,
898 [Define if C99 functions or macros in <math.h> should be imported
899 in <cmath> in namespace std for C++98.])
902 # Check for the existence of <complex.h> complex math functions.
903 # This is necessary even though libstdc++ uses the builtin versions
904 # of these functions, because if the builtin cannot be used, a reference
905 # to the library function is emitted.
906 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
907 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
908 if test x"$ac_has_complex_h" = x"yes"; then
909 AC_CACHE_CHECK([for ISO C99 support in <complex.h> for C++98],
910 glibcxx_cv_c99_complex_cxx98, [
911 GCC_TRY_COMPILE_OR_LINK(
912 [#include <complex.h>
913 typedef __complex__ float float_type;
914 typedef __complex__ double double_type;
915 typedef __complex__ long double ld_type;
916 volatile float_type tmpf;
917 volatile double_type tmpd;
918 volatile ld_type tmpld;
921 volatile long double ld;],
933 tmpf = cpowf(tmpf, tmpf);
946 tmpd = cpow(tmpd, tmpd);
950 tmpld = ccosl(tmpld);
951 tmpld = ccoshl(tmpld);
952 tmpld = cexpl(tmpld);
953 tmpld = clogl(tmpld);
954 tmpld = csinl(tmpld);
955 tmpld = csinhl(tmpld);
956 tmpld = csqrtl(tmpld);
957 tmpld = ctanl(tmpld);
958 tmpld = ctanhl(tmpld);
959 tmpld = cpowl(tmpld, tmpld);
960 tmpld = cprojl(tmpld);
961 ], [glibcxx_cv_c99_complex_cxx98=yes], [glibcxx_cv_c99_complex_cxx98=no])
964 if test x"$glibcxx_cv_c99_complex_cxx98" = x"yes"; then
965 AC_DEFINE(_GLIBCXX98_USE_C99_COMPLEX, 1,
966 [Define if C99 functions in <complex.h> should be used in
967 <complex> for C++98. Using compiler builtins for these functions
968 requires corresponding C99 library functions to be present.])
971 # Check for the existence in <stdio.h> of vscanf, et. al.
972 AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++98],
973 glibcxx_cv_c99_stdio_cxx98, [
974 GCC_TRY_COMPILE_OR_LINK(
977 void foo(char* fmt, ...)
979 va_list args; va_start(args, fmt);
980 vfscanf(stderr, "%i", args);
982 vsnprintf(fmt, 0, "%i", args);
983 vsscanf(fmt, "%i", args);
984 snprintf(fmt, 0, "%i");
986 [glibcxx_cv_c99_stdio_cxx98=yes], [glibcxx_cv_c99_stdio_cxx98=no])
988 if test x"$glibcxx_cv_c99_stdio_cxx98" = x"yes"; then
989 AC_DEFINE(_GLIBCXX98_USE_C99_STDIO, 1,
990 [Define if C99 functions or macros in <stdio.h> should be imported
991 in <cstdio> in namespace std for C++98.])
994 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
995 AC_CACHE_CHECK([for ISO C99 support in <stdlib.h> for C++98],
996 glibcxx_cv_c99_stdlib_cxx98, [
997 GCC_TRY_COMPILE_OR_LINK(
1000 volatile long double ld;
1001 volatile unsigned long long ll;
1004 f = strtof("gnu", &tmp);
1005 ld = strtold("gnu", &tmp);
1006 ll = strtoll("gnu", &tmp, 10);
1007 ll = strtoull("gnu", &tmp, 10);
1009 mydivt = lldiv(10,1);
1014 ], [glibcxx_cv_c99_stdlib_cxx98=yes], [glibcxx_cv_c99_stdlib_cxx98=no])
1016 if test x"$glibcxx_cv_c99_stdlib_cxx98" = x"yes"; then
1017 AC_DEFINE(_GLIBCXX98_USE_C99_STDLIB, 1,
1018 [Define if C99 functions or macros in <stdlib.h> should be imported
1019 in <cstdlib> in namespace std for C++98.])
1022 # Check for the existence in <wchar.h> of wcstold, etc.
1023 if test x"$ac_has_wchar_h" = xyes &&
1024 test x"$ac_has_wctype_h" = xyes; then
1025 AC_CACHE_CHECK([for ISO C99 support in <wchar.h> for C++98],
1026 glibcxx_cv_c99_wchar_cxx98, [
1027 AC_TRY_COMPILE([#include <wchar.h>
1034 ], [], [glibcxx_cv_c99_wchar_cxx98=yes], [glibcxx_cv_c99_wchar_cxx98=no])
1037 # Checks for wide character functions that may not be present.
1038 # Injection of these is wrapped with guard macros.
1039 # NB: only put functions here, instead of immediately above, if
1040 # absolutely necessary.
1041 AC_TRY_COMPILE([#include <wchar.h>
1042 namespace test { using ::vfwscanf; }], [],
1043 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1045 AC_TRY_COMPILE([#include <wchar.h>
1046 namespace test { using ::vswscanf; }], [],
1047 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1049 AC_TRY_COMPILE([#include <wchar.h>
1050 namespace test { using ::vwscanf; }], [],
1051 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1053 AC_TRY_COMPILE([#include <wchar.h>
1054 namespace test { using ::wcstof; }], [],
1055 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1057 AC_TRY_COMPILE([#include <wctype.h>],
1058 [wint_t t; int i = iswblank(t);],
1059 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1061 if test x"$glibcxx_cv_c99_wchar_cxx98" = x"yes"; then
1062 AC_DEFINE(_GLIBCXX98_USE_C99_WCHAR, 1,
1063 [Define if C99 functions or macros in <wchar.h> should be imported
1064 in <cwchar> in namespace std for C++98.])
1068 # Option parsed, now set things appropriately.
1069 if test x"$glibcxx_cv_c99_math_cxx98" = x"no" ||
1070 test x"$glibcxx_cv_c99_complex_cxx98" = x"no" ||
1071 test x"$glibcxx_cv_c99_stdio_cxx98" = x"no" ||
1072 test x"$glibcxx_cv_c99_stdlib_cxx98" = x"no" ||
1073 test x"$glibcxx_cv_c99_wchar_cxx98" = x"no"; then
1076 AC_DEFINE(_GLIBCXX_USE_C99, 1,
1077 [Define if C99 functions or macros from <wchar.h>, <math.h>,
1078 <complex.h>, <stdio.h>, and <stdlib.h> can be used or exposed.])
1081 gcc_no_link="$ac_save_gcc_no_link"
1082 LIBS="$ac_save_LIBS"
1083 CXXFLAGS="$ac_save_CXXFLAGS"
1089 # Use -std=c++11 and test again for C99 library feature in C++11 mode.
1090 # For the reasons given above we use -std=c++11 not -std=gnu++11.
1091 ac_save_CXXFLAGS="$CXXFLAGS"
1092 CXXFLAGS="$CXXFLAGS -std=c++11"
1093 ac_save_LIBS="$LIBS"
1094 ac_save_gcc_no_link="$gcc_no_link"
1096 if test x$gcc_no_link != xyes; then
1097 # Use -fno-exceptions to that the C driver can link these tests without
1098 # hitting undefined references to personality routines.
1099 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1100 AC_CHECK_LIB(m, sin, [LIBS="$LIBS -lm"], [
1101 # Use the default compile-only tests in GCC_TRY_COMPILE_OR_LINK
1106 # Check for the existence of <math.h> functions used if C99 is enabled.
1107 AC_CACHE_CHECK([for ISO C99 support in <math.h> for C++11],
1108 glibcxx_cv_c99_math_cxx11, [
1109 GCC_TRY_COMPILE_OR_LINK(
1111 volatile double d1, d2;
1113 [i = fpclassify(d1);
1119 i = isgreater(d1, d2);
1120 i = isgreaterequal(d1, d2);
1122 i = islessequal(d1, d2);
1123 i = islessgreater(d1, d2);
1124 i = islessgreater(d1, d2);
1125 i = isunordered(d1, d2);
1126 ], [glibcxx_cv_c99_math_cxx11=yes], [glibcxx_cv_c99_math_cxx11=no])
1128 if test x"$glibcxx_cv_c99_math_cxx11" = x"yes"; then
1129 AC_DEFINE(_GLIBCXX11_USE_C99_MATH, 1,
1130 [Define if C99 functions or macros in <math.h> should be imported
1131 in <cmath> in namespace std for C++11.])
1134 # Check for the existence of <complex.h> complex math functions.
1135 # This is necessary even though libstdc++ uses the builtin versions
1136 # of these functions, because if the builtin cannot be used, a reference
1137 # to the library function is emitted.
1138 AC_CHECK_HEADERS(tgmath.h, ac_has_tgmath_h=yes, ac_has_tgmath_h=no)
1139 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1140 if test x"$ac_has_complex_h" = x"yes"; then
1141 AC_CACHE_CHECK([for ISO C99 support in <complex.h> for C++11],
1142 glibcxx_cv_c99_complex_cxx11, [
1143 GCC_TRY_COMPILE_OR_LINK(
1144 [#include <complex.h>
1145 typedef __complex__ float float_type;
1146 typedef __complex__ double double_type;
1147 typedef __complex__ long double ld_type;
1148 volatile float_type tmpf;
1149 volatile double_type tmpd;
1150 volatile ld_type tmpld;
1153 volatile long double ld;],
1157 tmpf = ccoshf(tmpf);
1161 tmpf = csinhf(tmpf);
1162 tmpf = csqrtf(tmpf);
1164 tmpf = ctanhf(tmpf);
1165 tmpf = cpowf(tmpf, tmpf);
1166 tmpf = cprojf(tmpf);
1178 tmpd = cpow(tmpd, tmpd);
1182 tmpld = ccosl(tmpld);
1183 tmpld = ccoshl(tmpld);
1184 tmpld = cexpl(tmpld);
1185 tmpld = clogl(tmpld);
1186 tmpld = csinl(tmpld);
1187 tmpld = csinhl(tmpld);
1188 tmpld = csqrtl(tmpld);
1189 tmpld = ctanl(tmpld);
1190 tmpld = ctanhl(tmpld);
1191 tmpld = cpowl(tmpld, tmpld);
1192 tmpld = cprojl(tmpld);
1193 ], [glibcxx_cv_c99_complex_cxx11=yes], [glibcxx_cv_c99_complex_cxx11=no])
1196 if test x"$glibcxx_cv_c99_complex_cxx11" = x"yes"; then
1197 AC_DEFINE(_GLIBCXX11_USE_C99_COMPLEX, 1,
1198 [Define if C99 functions in <complex.h> should be used in
1199 <complex> for C++11. Using compiler builtins for these functions
1200 requires corresponding C99 library functions to be present.])
1203 # Check for the existence in <stdio.h> of vscanf, et. al.
1204 AC_CACHE_CHECK([for ISO C99 support in <stdio.h> for C++11],
1205 glibcxx_cv_c99_stdio_cxx11, [
1206 GCC_TRY_COMPILE_OR_LINK(
1209 void foo(char* fmt, ...)
1211 va_list args; va_start(args, fmt);
1212 vfscanf(stderr, "%i", args);
1214 vsnprintf(fmt, 0, "%i", args);
1215 vsscanf(fmt, "%i", args);
1216 snprintf(fmt, 0, "%i");
1218 [glibcxx_cv_c99_stdio_cxx11=yes], [glibcxx_cv_c99_stdio_cxx11=no])
1220 if test x"$glibcxx_cv_c99_stdio_cxx11" = x"yes"; then
1221 AC_DEFINE(_GLIBCXX11_USE_C99_STDIO, 1,
1222 [Define if C99 functions or macros in <stdio.h> should be imported
1223 in <cstdio> in namespace std for C++11.])
1226 # Check for the existence in <stdlib.h> of lldiv_t, et. al.
1227 AC_CACHE_CHECK([for ISO C99 support in <stdlib.h> for C++11],
1228 glibcxx_cv_c99_stdlib_cxx11, [
1229 GCC_TRY_COMPILE_OR_LINK(
1230 [#include <stdlib.h>
1232 volatile long double ld;
1233 volatile unsigned long long ll;
1236 f = strtof("gnu", &tmp);
1237 ld = strtold("gnu", &tmp);
1238 ll = strtoll("gnu", &tmp, 10);
1239 ll = strtoull("gnu", &tmp, 10);
1241 mydivt = lldiv(10,1);
1246 ], [glibcxx_cv_c99_stdlib_cxx11=yes], [glibcxx_cv_c99_stdlib_cxx11=no])
1248 if test x"$glibcxx_cv_c99_stdlib_cxx11" = x"yes"; then
1249 AC_DEFINE(_GLIBCXX11_USE_C99_STDLIB, 1,
1250 [Define if C99 functions or macros in <stdlib.h> should be imported
1251 in <cstdlib> in namespace std for C++11.])
1254 # Check for the existence in <wchar.h> of wcstold, etc.
1255 if test x"$ac_has_wchar_h" = xyes &&
1256 test x"$ac_has_wctype_h" = xyes; then
1257 AC_CACHE_CHECK([for ISO C99 support in <wchar.h> for C++11],
1258 glibcxx_cv_c99_wchar_cxx11, [
1259 AC_TRY_COMPILE([#include <wchar.h>
1266 ], [], [glibcxx_cv_c99_wchar_cxx11=yes], [glibcxx_cv_c99_wchar_cxx11=no])
1269 # Checks for wide character functions that may not be present.
1270 # Injection of these is wrapped with guard macros.
1271 # NB: only put functions here, instead of immediately above, if
1272 # absolutely necessary.
1273 AC_TRY_COMPILE([#include <wchar.h>
1274 namespace test { using ::vfwscanf; }], [],
1275 [AC_DEFINE(HAVE_VFWSCANF, 1, [Defined if vfwscanf exists.])], [])
1277 AC_TRY_COMPILE([#include <wchar.h>
1278 namespace test { using ::vswscanf; }], [],
1279 [AC_DEFINE(HAVE_VSWSCANF, 1, [Defined if vswscanf exists.])], [])
1281 AC_TRY_COMPILE([#include <wchar.h>
1282 namespace test { using ::vwscanf; }], [],
1283 [AC_DEFINE(HAVE_VWSCANF, 1, [Defined if vwscanf exists.])], [])
1285 AC_TRY_COMPILE([#include <wchar.h>
1286 namespace test { using ::wcstof; }], [],
1287 [AC_DEFINE(HAVE_WCSTOF, 1, [Defined if wcstof exists.])], [])
1289 AC_TRY_COMPILE([#include <wctype.h>],
1290 [wint_t t; int i = iswblank(t);],
1291 [AC_DEFINE(HAVE_ISWBLANK, 1, [Defined if iswblank exists.])], [])
1293 if test x"$glibcxx_cv_c99_wchar_cxx11" = x"yes"; then
1294 AC_DEFINE(_GLIBCXX11_USE_C99_WCHAR, 1,
1295 [Define if C99 functions or macros in <wchar.h> should be imported
1296 in <cwchar> in namespace std for C++11.])
1300 gcc_no_link="$ac_save_gcc_no_link"
1301 LIBS="$ac_save_LIBS"
1302 CXXFLAGS="$ac_save_CXXFLAGS"
1306 AC_MSG_CHECKING([for fully enabled ISO C99 support])
1307 AC_MSG_RESULT($enable_c99)
1312 dnl Check for clock_gettime, nanosleep and sched_yield, used in the
1313 dnl implementation of 20.11.7 [time.clock], and 30.3.2 [thread.thread.this]
1314 dnl in the C++11 standard.
1316 dnl --enable-libstdcxx-time
1317 dnl --enable-libstdcxx-time=yes
1318 dnl checks for the availability of monotonic and realtime clocks,
1319 dnl nanosleep and sched_yield in libc.
1320 dnl --enable-libstdcxx-time=rt
1321 dnl also searches (and, if needed, links) librt. Note that this is
1322 dnl not always desirable because, in glibc 2.16 and earlier, for
1323 dnl example, in turn it triggers the linking of libpthread too,
1324 dnl which activates locking,
1325 dnl a large overhead for single-thread programs.
1326 dnl --enable-libstdcxx-time=no
1327 dnl --disable-libstdcxx-time
1328 dnl disables the checks completely
1330 dnl N.B. Darwin provides nanosleep but doesn't support the whole POSIX
1331 dnl Timers option, so doesn't define _POSIX_TIMERS. Because the test
1332 dnl below fails Darwin unconditionally defines _GLIBCXX_USE_NANOSLEEP in
1333 dnl os_defines.h and also defines _GLIBCXX_USE_SCHED_YIELD.
1335 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
1337 GLIBCXX_ENABLE(libstdcxx-time,auto,[[[=KIND]]],
1338 [use KIND for check type],
1343 ac_save_CXXFLAGS="$CXXFLAGS"
1344 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1345 ac_save_LIBS="$LIBS"
1347 ac_has_clock_monotonic=no
1348 ac_has_clock_realtime=no
1350 ac_has_sched_yield=no
1352 if test x"$enable_libstdcxx_time" = x"auto"; then
1354 case "${target_os}" in
1356 ac_has_nanosleep=yes
1359 ac_has_win32_sleep=yes
1360 ac_has_sched_yield=yes
1363 ac_has_nanosleep=yes
1364 ac_has_sched_yield=yes
1366 # VxWorks has nanosleep as soon as the kernel is configured with
1367 # INCLUDE_POSIX_TIMERS, which is normally/most-often the case.
1369 ac_has_nanosleep=yes
1371 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
1372 # Don't use link test for freestanding library, in case gcc_no_link=yes
1373 if test x"$is_hosted" = xyes; then
1374 # Versions of glibc before 2.17 needed -lrt for clock_gettime.
1375 AC_SEARCH_LIBS(clock_gettime, [rt])
1376 if test x"$ac_cv_search_clock_gettime" = x"none required"; then
1377 ac_has_clock_monotonic=yes
1378 ac_has_clock_realtime=yes
1381 ac_has_nanosleep=yes
1382 ac_has_sched_yield=yes
1384 freebsd*|netbsd*|dragonfly*|rtems*)
1385 ac_has_clock_monotonic=yes
1386 ac_has_clock_realtime=yes
1387 ac_has_nanosleep=yes
1388 ac_has_sched_yield=yes
1391 ac_has_clock_monotonic=yes
1392 ac_has_clock_realtime=yes
1393 ac_has_nanosleep=yes
1396 ac_has_clock_monotonic=yes
1397 ac_has_clock_realtime=yes
1398 ac_has_nanosleep=yes
1399 ac_has_sched_yield=yes
1402 ac_has_nanosleep=yes
1403 ac_has_sched_yield=yes
1406 elif test x"$enable_libstdcxx_time" != x"no"; then
1408 if test x"$enable_libstdcxx_time" = x"rt"; then
1409 AC_SEARCH_LIBS(clock_gettime, [rt])
1410 AC_SEARCH_LIBS(nanosleep, [rt])
1412 AC_CHECK_FUNC(clock_gettime)
1413 AC_CHECK_FUNC(nanosleep)
1416 case "$ac_cv_search_clock_gettime" in
1417 -l*) GLIBCXX_LIBS=$ac_cv_search_clock_gettime
1420 case "$ac_cv_search_nanosleep" in
1421 -l*) GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_nanosleep"
1425 AC_SEARCH_LIBS(sched_yield, [rt])
1427 case "$ac_cv_search_sched_yield" in
1429 if test x"$enable_libstdcxx_time" = x"rt"; then
1430 GLIBCXX_LIBS="$GLIBCXX_LIBS $ac_cv_search_sched_yield"
1431 ac_has_sched_yield=yes
1435 ac_has_sched_yield=yes
1439 AC_CHECK_HEADERS(unistd.h, ac_has_unistd_h=yes, ac_has_unistd_h=no)
1441 if test x"$ac_has_unistd_h" = x"yes"; then
1442 AC_MSG_CHECKING([for monotonic clock])
1444 [#include <unistd.h>
1447 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1450 clock_gettime(CLOCK_MONOTONIC, &tp);
1451 ], [ac_has_clock_monotonic=yes], [ac_has_clock_monotonic=no])
1453 AC_MSG_RESULT($ac_has_clock_monotonic)
1455 AC_MSG_CHECKING([for realtime clock])
1457 [#include <unistd.h>
1460 [#if _POSIX_TIMERS > 0
1463 clock_gettime(CLOCK_REALTIME, &tp);
1464 ], [ac_has_clock_realtime=yes], [ac_has_clock_realtime=no])
1466 AC_MSG_RESULT($ac_has_clock_realtime)
1468 AC_MSG_CHECKING([for nanosleep])
1470 [#include <unistd.h>
1473 [#if _POSIX_TIMERS > 0
1477 ], [ac_has_nanosleep=yes], [ac_has_nanosleep=no])
1479 AC_MSG_RESULT($ac_has_nanosleep)
1483 if test x"$ac_has_clock_monotonic" != x"yes"; then
1484 case ${target_os} in
1486 AC_MSG_CHECKING([for clock_gettime syscall])
1488 [#include <unistd.h>
1490 #include <sys/syscall.h>
1492 [#if _POSIX_TIMERS > 0 && defined(_POSIX_MONOTONIC_CLOCK)
1495 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp);
1496 syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp);
1497 ], [ac_has_clock_gettime_syscall=yes], [ac_has_clock_gettime_syscall=no])
1498 AC_MSG_RESULT($ac_has_clock_gettime_syscall)
1499 if test x"$ac_has_clock_gettime_syscall" = x"yes"; then
1500 AC_DEFINE(_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL, 1,
1501 [Defined if clock_gettime syscall has monotonic and realtime clock support. ])
1502 ac_has_clock_monotonic=yes
1503 ac_has_clock_realtime=yes
1504 AC_MSG_CHECKING([for struct timespec that matches syscall])
1507 #include <sys/syscall.h>
1509 [#ifdef SYS_clock_gettime64
1510 #if SYS_clock_gettime64 != SYS_clock_gettime
1511 // We need to use SYS_clock_gettime and libc appears to
1512 // also know about the SYS_clock_gettime64 syscall.
1513 // Check that userspace doesn't use time64 version of timespec.
1514 static_assert(sizeof(timespec::tv_sec) == sizeof(long),
1515 "struct timespec must be compatible with SYS_clock_gettime");
1519 [ac_timespec_matches_syscall=yes],
1520 [ac_timespec_matches_syscall=no])
1521 AC_MSG_RESULT($ac_timespec_matches_syscall)
1522 if test x"$ac_timespec_matches_syscall" = no; then
1523 AC_MSG_ERROR([struct timespec is not compatible with SYS_clock_gettime, please report a bug to http://gcc.gnu.org/bugzilla])
1529 if test x"$ac_has_clock_monotonic" = x"yes"; then
1530 AC_DEFINE(_GLIBCXX_USE_CLOCK_MONOTONIC, 1,
1531 [ Defined if clock_gettime has monotonic clock support. ])
1534 if test x"$ac_has_clock_realtime" = x"yes"; then
1535 AC_DEFINE(_GLIBCXX_USE_CLOCK_REALTIME, 1,
1536 [ Defined if clock_gettime has realtime clock support. ])
1539 if test x"$ac_has_sched_yield" = x"yes"; then
1540 AC_DEFINE(_GLIBCXX_USE_SCHED_YIELD, 1,
1541 [ Defined if sched_yield is available. ])
1544 if test x"$ac_has_nanosleep" = x"yes"; then
1545 AC_DEFINE(_GLIBCXX_USE_NANOSLEEP, 1,
1546 [ Defined if nanosleep is available. ])
1547 elif test x"$ac_has_win32_sleep" = x"yes"; then
1548 AC_DEFINE(_GLIBCXX_USE_WIN32_SLEEP, 1,
1549 [Defined if Sleep exists.])
1551 AC_MSG_CHECKING([for sleep])
1552 AC_TRY_COMPILE([#include <unistd.h>],
1554 [ac_has_sleep=yes],[ac_has_sleep=no])
1555 if test x"$ac_has_sleep" = x"yes"; then
1556 AC_DEFINE(HAVE_SLEEP,1, [Defined if sleep exists.])
1558 AC_MSG_RESULT($ac_has_sleep)
1559 AC_MSG_CHECKING([for usleep])
1560 AC_TRY_COMPILE([#include <unistd.h>],
1563 [ac_has_usleep=yes],[ac_has_usleep=no])
1564 if test x"$ac_has_usleep" = x"yes"; then
1565 AC_DEFINE(HAVE_USLEEP,1, [Defined if usleep exists.])
1567 AC_MSG_RESULT($ac_has_usleep)
1570 if test x"$ac_has_nanosleep$ac_has_win32_sleep$ac_has_sleep" = x"nonono"; then
1571 AC_DEFINE(_GLIBCXX_NO_SLEEP,1, [Defined if no way to sleep is available.])
1574 AC_SUBST(GLIBCXX_LIBS)
1576 CXXFLAGS="$ac_save_CXXFLAGS"
1577 LIBS="$ac_save_LIBS"
1582 dnl Check for gettimeofday, used in the implementation of 20.11.7
1583 dnl [time.clock] in the C++11 standard.
1585 AC_DEFUN([GLIBCXX_CHECK_GETTIMEOFDAY], [
1587 AC_MSG_CHECKING([for gettimeofday])
1591 ac_save_CXXFLAGS="$CXXFLAGS"
1592 CXXFLAGS="$CXXFLAGS -fno-exceptions"
1594 ac_has_gettimeofday=no;
1595 AC_CHECK_HEADERS(sys/time.h, ac_has_sys_time_h=yes, ac_has_sys_time_h=no)
1596 if test x"$ac_has_sys_time_h" = x"yes"; then
1597 AC_MSG_CHECKING([for gettimeofday])
1598 GCC_TRY_COMPILE_OR_LINK([#include <sys/time.h>],
1599 [timeval tv; gettimeofday(&tv, 0);],
1600 [ac_has_gettimeofday=yes], [ac_has_gettimeofday=no])
1602 AC_MSG_RESULT($ac_has_gettimeofday)
1605 if test x"$ac_has_gettimeofday" = x"yes"; then
1606 AC_DEFINE(_GLIBCXX_USE_GETTIMEOFDAY, 1,
1607 [ Defined if gettimeofday is available. ])
1610 CXXFLAGS="$ac_save_CXXFLAGS"
1615 dnl Check for ISO/IEC 9899:1999 "C99" support to ISO/IEC DTR 19768 "TR1"
1616 dnl facilities in Chapter 8, "C compatibility".
1618 AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
1623 # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
1624 # undefined and fake C99 facilities may be spuriously enabled.
1625 ac_save_CXXFLAGS="$CXXFLAGS"
1626 CXXFLAGS="$CXXFLAGS -std=c++98"
1628 # Check for the existence of <complex.h> complex math functions used
1630 AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
1631 ac_c99_complex_tr1=no;
1632 if test x"$ac_has_complex_h" = x"yes"; then
1633 AC_MSG_CHECKING([for ISO C99 support to TR1 in <complex.h>])
1634 AC_TRY_COMPILE([#include <complex.h>],
1635 [typedef __complex__ float float_type; float_type tmpf;
1642 typedef __complex__ double double_type; double_type tmpd;
1649 typedef __complex__ long double ld_type; ld_type tmpld;
1656 ],[ac_c99_complex_tr1=yes], [ac_c99_complex_tr1=no])
1658 AC_MSG_RESULT($ac_c99_complex_tr1)
1659 if test x"$ac_c99_complex_tr1" = x"yes"; then
1660 AC_DEFINE(_GLIBCXX_USE_C99_COMPLEX_TR1, 1,
1661 [Define if C99 functions in <complex.h> should be used in
1662 <tr1/complex>. Using compiler builtins for these functions
1663 requires corresponding C99 library functions to be present.])
1666 # Check for the existence of <ctype.h> functions.
1667 AC_CACHE_CHECK([for ISO C99 support to TR1 in <ctype.h>],
1668 glibcxx_cv_c99_ctype_tr1, [
1669 AC_TRY_COMPILE([#include <ctype.h>],
1673 ],[glibcxx_cv_c99_ctype_tr1=yes],
1674 [glibcxx_cv_c99_ctype_tr1=no])
1676 if test x"$glibcxx_cv_c99_ctype_tr1" = x"yes"; then
1677 AC_DEFINE(_GLIBCXX_USE_C99_CTYPE_TR1, 1,
1678 [Define if C99 functions in <ctype.h> should be imported in
1679 <tr1/cctype> in namespace std::tr1.])
1682 # Check for the existence of <fenv.h> functions.
1683 AC_CHECK_HEADERS(fenv.h, ac_has_fenv_h=yes, ac_has_fenv_h=no)
1685 if test x"$ac_has_fenv_h" = x"yes"; then
1686 AC_MSG_CHECKING([for ISO C99 support to TR1 in <fenv.h>])
1687 AC_TRY_COMPILE([#include <fenv.h>],
1692 ret = feclearexcept(except);
1693 ret = fegetexceptflag(pflag, except);
1694 ret = feraiseexcept(except);
1695 ret = fesetexceptflag(pflag, except);
1696 ret = fetestexcept(except);
1698 ret = fesetround(mode);
1699 ret = fegetenv(penv);
1700 ret = feholdexcept(penv);
1701 ret = fesetenv(penv);
1702 ret = feupdateenv(penv);
1703 ],[ac_c99_fenv_tr1=yes], [ac_c99_fenv_tr1=no])
1704 AC_MSG_RESULT($ac_c99_fenv_tr1)
1706 if test x"$ac_c99_fenv_tr1" = x"yes"; then
1707 AC_DEFINE(_GLIBCXX_USE_C99_FENV_TR1, 1,
1708 [Define if C99 functions in <fenv.h> should be imported in
1709 <tr1/cfenv> in namespace std::tr1.])
1712 # Check for the existence of <stdint.h> types.
1713 AC_CACHE_CHECK([for ISO C99 support to TR1 in <stdint.h>],
1714 glibcxx_cv_c99_stdint_tr1, [
1715 AC_TRY_COMPILE([#define __STDC_LIMIT_MACROS
1716 #define __STDC_CONSTANT_MACROS
1717 #include <stdint.h>],
1718 [typedef int8_t my_int8_t;
1719 my_int8_t i8 = INT8_MIN;
1721 typedef int16_t my_int16_t;
1722 my_int16_t i16 = INT16_MIN;
1724 typedef int32_t my_int32_t;
1725 my_int32_t i32 = INT32_MIN;
1727 typedef int64_t my_int64_t;
1728 my_int64_t i64 = INT64_MIN;
1730 typedef int_fast8_t my_int_fast8_t;
1731 my_int_fast8_t if8 = INT_FAST8_MIN;
1732 if8 = INT_FAST8_MAX;
1733 typedef int_fast16_t my_int_fast16_t;
1734 my_int_fast16_t if16 = INT_FAST16_MIN;
1735 if16 = INT_FAST16_MAX;
1736 typedef int_fast32_t my_int_fast32_t;
1737 my_int_fast32_t if32 = INT_FAST32_MIN;
1738 if32 = INT_FAST32_MAX;
1739 typedef int_fast64_t my_int_fast64_t;
1740 my_int_fast64_t if64 = INT_FAST64_MIN;
1741 if64 = INT_FAST64_MAX;
1742 typedef int_least8_t my_int_least8_t;
1743 my_int_least8_t il8 = INT_LEAST8_MIN;
1744 il8 = INT_LEAST8_MAX;
1745 typedef int_least16_t my_int_least16_t;
1746 my_int_least16_t il16 = INT_LEAST16_MIN;
1747 il16 = INT_LEAST16_MAX;
1748 typedef int_least32_t my_int_least32_t;
1749 my_int_least32_t il32 = INT_LEAST32_MIN;
1750 il32 = INT_LEAST32_MAX;
1751 typedef int_least64_t my_int_least64_t;
1752 my_int_least64_t il64 = INT_LEAST64_MIN;
1753 il64 = INT_LEAST64_MAX;
1754 typedef intmax_t my_intmax_t;
1755 my_intmax_t im = INTMAX_MAX;
1757 typedef intptr_t my_intptr_t;
1758 my_intptr_t ip = INTPTR_MAX;
1760 typedef uint8_t my_uint8_t;
1761 my_uint8_t ui8 = UINT8_MAX;
1763 typedef uint16_t my_uint16_t;
1764 my_uint16_t ui16 = UINT16_MAX;
1766 typedef uint32_t my_uint32_t;
1767 my_uint32_t ui32 = UINT32_MAX;
1769 typedef uint64_t my_uint64_t;
1770 my_uint64_t ui64 = UINT64_MAX;
1772 typedef uint_fast8_t my_uint_fast8_t;
1773 my_uint_fast8_t uif8 = UINT_FAST8_MAX;
1774 uif8 = UINT_FAST8_MAX;
1775 typedef uint_fast16_t my_uint_fast16_t;
1776 my_uint_fast16_t uif16 = UINT_FAST16_MAX;
1777 uif16 = UINT_FAST16_MAX;
1778 typedef uint_fast32_t my_uint_fast32_t;
1779 my_uint_fast32_t uif32 = UINT_FAST32_MAX;
1780 uif32 = UINT_FAST32_MAX;
1781 typedef uint_fast64_t my_uint_fast64_t;
1782 my_uint_fast64_t uif64 = UINT_FAST64_MAX;
1783 uif64 = UINT_FAST64_MAX;
1784 typedef uint_least8_t my_uint_least8_t;
1785 my_uint_least8_t uil8 = UINT_LEAST8_MAX;
1786 uil8 = UINT_LEAST8_MAX;
1787 typedef uint_least16_t my_uint_least16_t;
1788 my_uint_least16_t uil16 = UINT_LEAST16_MAX;
1789 uil16 = UINT_LEAST16_MAX;
1790 typedef uint_least32_t my_uint_least32_t;
1791 my_uint_least32_t uil32 = UINT_LEAST32_MAX;
1792 uil32 = UINT_LEAST32_MAX;
1793 typedef uint_least64_t my_uint_least64_t;
1794 my_uint_least64_t uil64 = UINT_LEAST64_MAX;
1795 uil64 = UINT_LEAST64_MAX;
1796 typedef uintmax_t my_uintmax_t;
1797 my_uintmax_t uim = UINTMAX_MAX;
1799 typedef uintptr_t my_uintptr_t;
1800 my_uintptr_t uip = UINTPTR_MAX;
1802 ],[glibcxx_cv_c99_stdint_tr1=yes],
1803 [glibcxx_cv_c99_stdint_tr1=no])
1805 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1806 AC_DEFINE(_GLIBCXX_USE_C99_STDINT_TR1, 1,
1807 [Define if C99 types in <stdint.h> should be imported in
1808 <tr1/cstdint> in namespace std::tr1.])
1811 # Check for the existence of <math.h> functions.
1812 AC_CACHE_CHECK([for ISO C99 support to TR1 in <math.h>],
1813 glibcxx_cv_c99_math_tr1, [
1814 AC_TRY_COMPILE([#include <math.h>],
1815 [typedef double_t my_double_t;
1816 typedef float_t my_float_t;
1830 copysignf(0.0f, 0.0f);
1831 copysignl(0.0l, 0.0l);
1848 fmaf(0.0f, 0.0f, 0.0f);
1849 fmal(0.0l, 0.0l, 0.0l);
1865 #ifndef __APPLE__ /* see below */
1894 nextafter(0.0, 0.0);
1895 nextafterf(0.0f, 0.0f);
1896 nextafterl(0.0l, 0.0l);
1897 nexttoward(0.0, 0.0);
1898 nexttowardf(0.0f, 0.0f);
1899 nexttowardl(0.0l, 0.0l);
1900 remainder(0.0, 0.0);
1901 remainderf(0.0f, 0.0f);
1902 remainderl(0.0l, 0.0l);
1903 remquo(0.0, 0.0, 0);
1904 remquof(0.0f, 0.0f, 0);
1905 remquol(0.0l, 0.0l, 0);
1924 ],[glibcxx_cv_c99_math_tr1=yes], [glibcxx_cv_c99_math_tr1=no])
1926 if test x"$glibcxx_cv_c99_math_tr1" = x"yes"; then
1927 AC_DEFINE(_GLIBCXX_USE_C99_MATH_TR1, 1,
1928 [Define if C99 functions or macros in <math.h> should be imported
1929 in <tr1/cmath> in namespace std::tr1.])
1931 case "${target_os}" in
1933 AC_CACHE_CHECK([for ISO C99 rounding functions in <math.h>],
1934 glibcxx_cv_c99_math_llround, [
1935 AC_TRY_COMPILE([#include <math.h>],
1943 [glibcxx_cv_c99_math_llround=yes],
1944 [glibcxx_cv_c99_math_llround=no])
1948 if test x"$glibcxx_cv_c99_math_llround" = x"no"; then
1949 AC_DEFINE(_GLIBCXX_NO_C99_ROUNDING_FUNCS, 1,
1950 [Define if C99 llrint and llround functions are missing from <math.h>.])
1954 # Check for the existence of <inttypes.h> functions (NB: doesn't make
1955 # sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1956 ac_c99_inttypes_tr1=no;
1957 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1958 AC_MSG_CHECKING([for ISO C99 support to TR1 in <inttypes.h>])
1959 AC_TRY_COMPILE([#include <inttypes.h>],
1960 [intmax_t i, numer, denom, base;
1963 intmax_t ret = imaxabs(i);
1964 imaxdiv_t dret = imaxdiv(numer, denom);
1965 ret = strtoimax(s, endptr, base);
1966 uintmax_t uret = strtoumax(s, endptr, base);
1967 ],[ac_c99_inttypes_tr1=yes], [ac_c99_inttypes_tr1=no])
1968 AC_MSG_RESULT($ac_c99_inttypes_tr1)
1970 if test x"$ac_c99_inttypes_tr1" = x"yes"; then
1971 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_TR1, 1,
1972 [Define if C99 functions in <inttypes.h> should be imported in
1973 <tr1/cinttypes> in namespace std::tr1.])
1976 # Check for the existence of wchar_t <inttypes.h> functions (NB: doesn't
1977 # make sense if the glibcxx_cv_c99_stdint_tr1 check fails, per C99, 7.8/1).
1978 ac_c99_inttypes_wchar_t_tr1=no;
1979 if test x"$glibcxx_cv_c99_stdint_tr1" = x"yes"; then
1980 AC_MSG_CHECKING([for wchar_t ISO C99 support to TR1 in <inttypes.h>])
1981 AC_TRY_COMPILE([#include <inttypes.h>],
1985 intmax_t ret = wcstoimax(s, endptr, base);
1986 uintmax_t uret = wcstoumax(s, endptr, base);
1987 ],[ac_c99_inttypes_wchar_t_tr1=yes],
1988 [ac_c99_inttypes_wchar_t_tr1=no])
1989 AC_MSG_RESULT($ac_c99_inttypes_wchar_t_tr1)
1991 if test x"$ac_c99_inttypes_wchar_t_tr1" = x"yes"; then
1992 AC_DEFINE(_GLIBCXX_USE_C99_INTTYPES_WCHAR_T_TR1, 1,
1993 [Define if wchar_t C99 functions in <inttypes.h> should be
1994 imported in <tr1/cinttypes> in namespace std::tr1.])
1997 # Check for the existence of the <stdbool.h> header.
1998 AC_CHECK_HEADERS(stdbool.h)
2000 # Check for the existence of the <stdalign.h> header.
2001 AC_CHECK_HEADERS(stdalign.h)
2003 CXXFLAGS="$ac_save_CXXFLAGS"
2008 dnl Check for uchar.h and usability.
2010 AC_DEFUN([GLIBCXX_CHECK_UCHAR_H], [
2013 AC_CHECK_HEADERS(uchar.h, ac_has_uchar_h=yes, ac_has_uchar_h=no)
2017 ac_save_CXXFLAGS="$CXXFLAGS"
2018 CXXFLAGS="$CXXFLAGS -std=c++11"
2020 if test x"$ac_has_uchar_h" = x"yes"; then
2021 AC_MSG_CHECKING([for ISO C11 support for <uchar.h>])
2022 AC_TRY_COMPILE([#include <uchar.h>
2023 #ifdef __STDC_UTF_16__
2024 long i = __STDC_UTF_16__;
2026 #ifdef __STDC_UTF_32__
2027 long j = __STDC_UTF_32__;
2037 [], [ac_c11_uchar_cxx11=yes], [ac_c11_uchar_cxx11=no])
2038 AC_MSG_RESULT($ac_c11_uchar_cxx11)
2040 ac_c11_uchar_cxx11=no
2042 if test x"$ac_c11_uchar_cxx11" = x"yes"; then
2043 AC_DEFINE(_GLIBCXX_USE_C11_UCHAR_CXX11, 1,
2044 [Define if C11 functions in <uchar.h> should be imported into
2045 namespace std in <cuchar>.])
2048 CXXFLAGS="$CXXFLAGS -fchar8_t"
2049 if test x"$ac_has_uchar_h" = x"yes"; then
2050 AC_MSG_CHECKING([for c8rtomb and mbrtoc8 in <uchar.h> with -fchar8_t])
2051 AC_TRY_COMPILE([#include <uchar.h>
2058 [], [ac_uchar_c8rtomb_mbrtoc8_fchar8_t=yes],
2059 [ac_uchar_c8rtomb_mbrtoc8_fchar8_t=no])
2060 AC_MSG_RESULT($ac_uchar_c8rtomb_mbrtoc8_fchar8_t)
2062 ac_uchar_c8rtomb_mbrtoc8_fchar8_t=no
2064 if test x"$ac_uchar_c8rtomb_mbrtoc8_fchar8_t" = x"yes"; then
2065 AC_DEFINE(_GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_FCHAR8_T, 1,
2066 [Define if c8rtomb and mbrtoc8 functions in <uchar.h> should be
2067 imported into namespace std in <cuchar> for -fchar8_t.])
2070 CXXFLAGS="$CXXFLAGS -std=c++20"
2071 if test x"$ac_has_uchar_h" = x"yes"; then
2072 AC_MSG_CHECKING([for c8rtomb and mbrtoc8 in <uchar.h> with -std=c++20])
2073 AC_TRY_COMPILE([#include <uchar.h>
2080 [], [ac_uchar_c8rtomb_mbrtoc8_cxx20=yes],
2081 [ac_uchar_c8rtomb_mbrtoc8_cxx20=no])
2082 AC_MSG_RESULT($ac_uchar_c8rtomb_mbrtoc8_cxx20)
2084 ac_uchar_c8rtomb_mbrtoc8_cxx20=no
2086 if test x"$ac_uchar_c8rtomb_mbrtoc8_cxx20" = x"yes"; then
2087 AC_DEFINE(_GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_CXX20, 1,
2088 [Define if c8rtomb and mbrtoc8 functions in <uchar.h> should be
2089 imported into namespace std in <cuchar> for C++20.])
2092 CXXFLAGS="$ac_save_CXXFLAGS"
2098 dnl Check whether "/dev/random" and "/dev/urandom" are available for
2099 dnl class std::random_device from C++ 2011 [rand.device], and
2100 dnl random_device of "TR1" (Chapter 5.1, "Random number generation").
2102 AC_DEFUN([GLIBCXX_CHECK_DEV_RANDOM], [
2104 AC_CACHE_CHECK([for "/dev/random" and "/dev/urandom" for std::random_device],
2105 glibcxx_cv_dev_random, [
2106 if test -r /dev/random && test -r /dev/urandom; then
2107 ## For MSys environment the test above is detected as false-positive
2108 ## on mingw-targets. So disable it explicitly for them.
2109 case ${target_os} in
2110 *mingw*) glibcxx_cv_dev_random=no ;;
2111 *) glibcxx_cv_dev_random=yes ;;
2114 glibcxx_cv_dev_random=no;
2118 if test x"$glibcxx_cv_dev_random" = x"yes"; then
2119 AC_DEFINE(_GLIBCXX_USE_DEV_RANDOM, 1,
2120 [Define if /dev/random and /dev/urandom are available for
2121 std::random_device.])
2122 AC_DEFINE(_GLIBCXX_USE_RANDOM_TR1, 1,
2123 [Define if /dev/random and /dev/urandom are available for
2124 the random_device of TR1 (Chapter 5.1).])
2130 dnl Compute the EOF, SEEK_CUR, and SEEK_END integer constants.
2132 AC_DEFUN([GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS], [
2134 if test "$is_hosted" = yes; then
2135 AC_CACHE_CHECK([for the value of EOF], glibcxx_cv_stdio_eof, [
2136 AC_COMPUTE_INT([glibcxx_cv_stdio_eof], [[EOF]],
2137 [#include <stdio.h>],
2138 [AC_MSG_ERROR([computing EOF failed])])
2140 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_EOF, $glibcxx_cv_stdio_eof,
2141 [Define to the value of the EOF integer constant.])
2143 AC_CACHE_CHECK([for the value of SEEK_CUR], glibcxx_cv_stdio_seek_cur, [
2144 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_cur], [[SEEK_CUR]],
2145 [#include <stdio.h>],
2146 [AC_MSG_ERROR([computing SEEK_CUR failed])])
2148 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_CUR, $glibcxx_cv_stdio_seek_cur,
2149 [Define to the value of the SEEK_CUR integer constant.])
2151 AC_CACHE_CHECK([for the value of SEEK_END], glibcxx_cv_stdio_seek_end, [
2152 AC_COMPUTE_INT([glibcxx_cv_stdio_seek_end], [[SEEK_END]],
2153 [#include <stdio.h>],
2154 [AC_MSG_ERROR([computing SEEK_END failed])])
2156 AC_DEFINE_UNQUOTED(_GLIBCXX_STDIO_SEEK_END, $glibcxx_cv_stdio_seek_end,
2157 [Define to the value of the SEEK_END integer constant.])
2162 dnl Check whether required C++ overloads are present in <stdio.h>.
2164 AC_DEFUN([GLIBCXX_CHECK_STDIO_PROTO], [
2168 # Use C++11 because a conforming <stdio.h> won't define gets for C++14,
2169 # and we don't need a declaration for C++14 anyway.
2170 ac_save_CXXFLAGS="$CXXFLAGS"
2171 CXXFLAGS="$CXXFLAGS -std=gnu++11"
2173 AC_CACHE_CHECK([for gets declaration], glibcxx_cv_gets, [
2174 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2181 [glibcxx_cv_gets=yes],
2182 [glibcxx_cv_gets=no]
2185 if test $glibcxx_cv_gets = yes; then
2186 AC_DEFINE(HAVE_GETS, 1, [Define if gets is available in <stdio.h> before C++14.])
2189 CXXFLAGS="$ac_save_CXXFLAGS"
2194 dnl Check whether required C++11 overloads for floating point and integral
2195 dnl types are present in <math.h>.
2197 AC_DEFUN([GLIBCXX_CHECK_MATH11_PROTO], [
2201 ac_save_CXXFLAGS="$CXXFLAGS"
2202 CXXFLAGS="$CXXFLAGS -std=c++11"
2206 # Solaris 12 Build 86, Solaris 11.3 SRU 3.6, and Solaris 10 Patch
2207 # 11996[67]-02 introduced the C++11 <math.h> floating point overloads.
2208 AC_CACHE_CHECK([for C++11 <math.h> floating point overloads],
2209 glibcxx_cv_math11_fp_overload, [
2210 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2214 inline bool isfinite(float __x)
2215 { return __builtin_isfinite(__x); }
2218 [glibcxx_cv_math11_fp_overload=no],
2219 [glibcxx_cv_math11_fp_overload=yes]
2222 # autoheader cannot handle indented templates.
2223 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_FP],
2224 [/* Define if all C++11 floating point overloads are available in <math.h>. */
2225 #if __cplusplus >= 201103L
2226 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_FP
2229 if test $glibcxx_cv_math11_fp_overload = yes; then
2230 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_FP)
2233 # Solaris 12 Build 90, Solaris 11.3 SRU 5.6, and Solaris 10 Patch
2234 # 11996[67]-02 introduced the C++11 <math.h> integral type overloads.
2235 AC_CACHE_CHECK([for C++11 <math.h> integral type overloads],
2236 glibcxx_cv_math11_int_overload, [
2237 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2240 template<typename _Tp>
2241 struct __is_integer;
2243 struct __is_integer<int>
2245 enum { __value = 1 };
2248 namespace __gnu_cxx {
2249 template<bool, typename>
2251 template<typename _Tp>
2252 struct __enable_if<true, _Tp>
2253 { typedef _Tp __type; };
2256 template<typename _Tp>
2257 constexpr typename __gnu_cxx::__enable_if
2258 <__is_integer<_Tp>::__value, double>::__type
2260 { return __builtin_log2(__x); }
2266 return std::log2(i);
2269 [glibcxx_cv_math11_int_overload=no],
2270 [glibcxx_cv_math11_int_overload=yes]
2273 # autoheader cannot handle indented templates.
2274 AH_VERBATIM([__CORRECT_ISO_CPP11_MATH_H_PROTO_INT],
2275 [/* Define if all C++11 integral type overloads are available in <math.h>. */
2276 #if __cplusplus >= 201103L
2277 #undef __CORRECT_ISO_CPP11_MATH_H_PROTO_INT
2280 if test $glibcxx_cv_math11_int_overload = yes; then
2281 AC_DEFINE(__CORRECT_ISO_CPP11_MATH_H_PROTO_INT)
2285 # If <math.h> defines the obsolete isinf(double) and isnan(double)
2286 # functions (instead of or as well as the C99 generic macros) then we
2287 # can't define std::isinf(double) and std::isnan(double) in <cmath>
2288 # and must use the ones from <math.h> instead.
2289 AC_CACHE_CHECK([for obsolete isinf function in <math.h>],
2290 glibcxx_cv_obsolete_isinf, [
2291 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2292 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2298 bool isinf(long double);
2301 bool b = isinf(0.0);
2303 [glibcxx_cv_obsolete_isinf=yes],
2304 [glibcxx_cv_obsolete_isinf=no]
2306 if test $glibcxx_cv_obsolete_isinf = yes; then
2307 AC_DEFINE(HAVE_OBSOLETE_ISINF, 1,
2308 [Define if <math.h> defines obsolete isinf function.])
2311 AC_CACHE_CHECK([for obsolete isnan function in <math.h>],
2312 glibcxx_cv_obsolete_isnan, [
2313 AC_COMPILE_IFELSE([AC_LANG_SOURCE(
2314 [#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
2320 bool isnan(long double);
2323 bool b = isnan(0.0);
2325 [glibcxx_cv_obsolete_isnan=yes],
2326 [glibcxx_cv_obsolete_isnan=no]
2328 if test $glibcxx_cv_obsolete_isnan = yes; then
2329 AC_DEFINE(HAVE_OBSOLETE_ISNAN, 1,
2330 [Define if <math.h> defines obsolete isnan function.])
2335 CXXFLAGS="$ac_save_CXXFLAGS"
2340 dnl Check for what type of C headers to use.
2342 dnl --enable-cheaders= [does stuff].
2343 dnl --disable-cheaders [does not do anything, really].
2344 dnl + Usage: GLIBCXX_ENABLE_CHEADERS[(DEFAULT)]
2345 dnl Where DEFAULT is either 'c' or 'c_global' or 'c_std'.
2347 dnl To use the obsolete 'c_std' headers use --enable-cheaders-obsolete as
2348 dnl well as --enable-cheaders=c_std, otherwise configure will fail.
2350 AC_DEFUN([GLIBCXX_ENABLE_CHEADERS], [
2351 GLIBCXX_ENABLE(cheaders-obsolete,no,,
2352 [allow use of obsolete "C" headers for g++])
2353 GLIBCXX_ENABLE(cheaders,$1,[[[=KIND]]],
2354 [construct "C" headers for g++], [permit c|c_global|c_std])
2355 AC_MSG_NOTICE("C" header strategy set to $enable_cheaders)
2356 if test $enable_cheaders = c_std ; then
2357 AC_MSG_WARN([the --enable-cheaders=c_std configuration is obsolete, c_global should be used instead])
2358 AC_MSG_WARN([if you are unable to use c_global please report a bug or inform libstdc++@gcc.gnu.org])
2359 if test $enable_cheaders_obsolete != yes ; then
2360 AC_MSG_ERROR(use --enable-cheaders-obsolete to use c_std "C" headers)
2364 C_INCLUDE_DIR='${glibcxx_srcdir}/include/'$enable_cheaders
2366 # Allow overrides to configure.host here.
2367 if test $enable_cheaders = c_global; then
2371 AC_SUBST(C_INCLUDE_DIR)
2372 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C, test $enable_cheaders = c)
2373 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_STD, test $enable_cheaders = c_std)
2374 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_C_GLOBAL, test $enable_cheaders = c_global)
2375 GLIBCXX_CONDITIONAL(GLIBCXX_C_HEADERS_COMPATIBILITY, test $c_compatibility = yes)
2380 dnl Check for which locale library to use. The choice is mapped to
2381 dnl a subdirectory of config/locale.
2383 dnl Default is generic.
2385 AC_DEFUN([GLIBCXX_ENABLE_CLOCALE], [
2386 GLIBCXX_ENABLE(clocale,auto,[[[=MODEL]]],
2387 [use MODEL for target locale package],
2388 [permit generic|gnu|ieee_1003.1-2001|newlib|yes|no|auto])
2390 # Deal with gettext issues. Default to not using it (=no) until we detect
2391 # support for it later. Let the user turn it off via --e/d, but let that
2392 # default to on for easier handling.
2395 AC_HELP_STRING([--enable-nls],[use Native Language Support (default)]),
2399 # Either a known package, or "auto"
2400 if test $enable_clocale = no || test $enable_clocale = yes; then
2403 enable_clocale_flag=$enable_clocale
2405 # Probe for locale model to use if none specified.
2406 # Default to "generic".
2407 if test $enable_clocale_flag = auto; then
2408 case ${target_os} in
2409 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2410 enable_clocale_flag=gnu
2413 enable_clocale_flag=darwin
2416 enable_clocale_flag=vxworks
2418 dragonfly* | freebsd*)
2419 enable_clocale_flag=dragonfly
2422 enable_clocale_flag=newlib
2425 if test x"$with_newlib" = x"yes"; then
2426 enable_clocale_flag=newlib
2428 enable_clocale_flag=generic
2434 # Sanity check model, and test for special functionality.
2435 if test $enable_clocale_flag = gnu; then
2436 AC_EGREP_CPP([_GLIBCXX_ok], [
2437 #include <features.h>
2438 #if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined(__UCLIBC__)
2441 ], enable_clocale_flag=gnu, enable_clocale_flag=generic)
2443 # Set it to scream when it hurts.
2444 ac_save_CFLAGS="$CFLAGS"
2445 CFLAGS="-Wimplicit-function-declaration -Werror"
2447 # Use strxfrm_l if available.
2448 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2450 #include <locale.h>],
2451 [char s[128]; __locale_t loc; strxfrm_l(s, "C", 5, loc);],
2452 AC_DEFINE(HAVE_STRXFRM_L, 1,
2453 [Define if strxfrm_l is available in <string.h>.]),)
2455 # Use strerror_l if available.
2456 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2458 #include <locale.h>],
2459 [__locale_t loc; strerror_l(5, loc);],
2460 AC_DEFINE(HAVE_STRERROR_L, 1,
2461 [Define if strerror_l is available in <string.h>.]),)
2463 CFLAGS="$ac_save_CFLAGS"
2466 # Perhaps use strerror_r if available, and strerror_l isn't.
2467 ac_save_CFLAGS="$CFLAGS"
2468 CFLAGS="-Wimplicit-function-declaration -Werror"
2469 AC_TRY_COMPILE([#define _GNU_SOURCE 1
2471 #include <locale.h>],
2472 [char s[128]; strerror_r(5, s, 128);],
2473 AC_DEFINE(HAVE_STRERROR_R, 1,
2474 [Define if strerror_r is available in <string.h>.]),)
2475 CFLAGS="$ac_save_CFLAGS"
2477 # Set configure bits for specified locale package
2478 AC_MSG_CHECKING([for C locale to use])
2479 case ${enable_clocale_flag} in
2481 AC_MSG_RESULT(generic)
2483 CLOCALE_H=config/locale/generic/c_locale.h
2484 CLOCALE_CC=config/locale/generic/c_locale.cc
2485 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2486 CCOLLATE_CC=config/locale/generic/collate_members.cc
2487 CCTYPE_CC=config/locale/generic/ctype_members.cc
2488 CMESSAGES_H=config/locale/generic/messages_members.h
2489 CMESSAGES_CC=config/locale/generic/messages_members.cc
2490 CMONEY_CC=config/locale/generic/monetary_members.cc
2491 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2492 CTIME_H=config/locale/generic/time_members.h
2493 CTIME_CC=config/locale/generic/time_members.cc
2494 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2497 AC_MSG_RESULT(darwin)
2499 CLOCALE_H=config/locale/generic/c_locale.h
2500 CLOCALE_CC=config/locale/generic/c_locale.cc
2501 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2502 CCOLLATE_CC=config/locale/generic/collate_members.cc
2503 CCTYPE_CC=config/locale/darwin/ctype_members.cc
2504 CMESSAGES_H=config/locale/generic/messages_members.h
2505 CMESSAGES_CC=config/locale/generic/messages_members.cc
2506 CMONEY_CC=config/locale/generic/monetary_members.cc
2507 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2508 CTIME_H=config/locale/generic/time_members.h
2509 CTIME_CC=config/locale/generic/time_members.cc
2510 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2513 AC_MSG_RESULT(vxworks)
2515 CLOCALE_H=config/locale/generic/c_locale.h
2516 CLOCALE_CC=config/locale/generic/c_locale.cc
2517 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2518 CCOLLATE_CC=config/locale/generic/collate_members.cc
2519 CCTYPE_CC=config/locale/vxworks/ctype_members.cc
2520 CMESSAGES_H=config/locale/generic/messages_members.h
2521 CMESSAGES_CC=config/locale/generic/messages_members.cc
2522 CMONEY_CC=config/locale/generic/monetary_members.cc
2523 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2524 CTIME_H=config/locale/generic/time_members.h
2525 CTIME_CC=config/locale/generic/time_members.cc
2526 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2529 AC_MSG_RESULT(dragonfly or freebsd)
2531 CLOCALE_H=config/locale/dragonfly/c_locale.h
2532 CLOCALE_CC=config/locale/dragonfly/c_locale.cc
2533 CCODECVT_CC=config/locale/dragonfly/codecvt_members.cc
2534 CCOLLATE_CC=config/locale/dragonfly/collate_members.cc
2535 CCTYPE_CC=config/locale/dragonfly/ctype_members.cc
2536 CMESSAGES_H=config/locale/generic/messages_members.h
2537 CMESSAGES_CC=config/locale/generic/messages_members.cc
2538 CMONEY_CC=config/locale/dragonfly/monetary_members.cc
2539 CNUMERIC_CC=config/locale/dragonfly/numeric_members.cc
2540 CTIME_H=config/locale/dragonfly/time_members.h
2541 CTIME_CC=config/locale/dragonfly/time_members.cc
2542 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2548 # Declare intention to use gettext, and add support for specific
2550 # For some reason, ALL_LINGUAS has to be before AM-GNU-GETTEXT
2553 # Don't call AM-GNU-GETTEXT here. Instead, assume glibc.
2554 AC_CHECK_PROG(check_msgfmt, msgfmt, yes, no)
2555 if test x"$check_msgfmt" = x"yes" && test x"$enable_nls" = x"yes"; then
2558 # Export the build objects.
2559 for ling in $ALL_LINGUAS; do \
2560 glibcxx_MOFILES="$glibcxx_MOFILES $ling.mo"; \
2561 glibcxx_POFILES="$glibcxx_POFILES $ling.po"; \
2563 AC_SUBST(glibcxx_MOFILES)
2564 AC_SUBST(glibcxx_POFILES)
2566 CLOCALE_H=config/locale/gnu/c_locale.h
2567 CLOCALE_CC=config/locale/gnu/c_locale.cc
2568 CCODECVT_CC=config/locale/gnu/codecvt_members.cc
2569 CCOLLATE_CC=config/locale/gnu/collate_members.cc
2570 CCTYPE_CC=config/locale/gnu/ctype_members.cc
2571 CMESSAGES_H=config/locale/gnu/messages_members.h
2572 CMESSAGES_CC=config/locale/gnu/messages_members.cc
2573 CMONEY_CC=config/locale/gnu/monetary_members.cc
2574 CNUMERIC_CC=config/locale/gnu/numeric_members.cc
2575 CTIME_H=config/locale/gnu/time_members.h
2576 CTIME_CC=config/locale/gnu/time_members.cc
2577 CLOCALE_INTERNAL_H=config/locale/gnu/c++locale_internal.h
2580 AC_MSG_RESULT(IEEE 1003.1)
2582 CLOCALE_H=config/locale/ieee_1003.1-2001/c_locale.h
2583 CLOCALE_CC=config/locale/ieee_1003.1-2001/c_locale.cc
2584 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2585 CCOLLATE_CC=config/locale/generic/collate_members.cc
2586 CCTYPE_CC=config/locale/generic/ctype_members.cc
2587 CMESSAGES_H=config/locale/ieee_1003.1-2001/messages_members.h
2588 CMESSAGES_CC=config/locale/ieee_1003.1-2001/messages_members.cc
2589 CMONEY_CC=config/locale/generic/monetary_members.cc
2590 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2591 CTIME_H=config/locale/generic/time_members.h
2592 CTIME_CC=config/locale/generic/time_members.cc
2593 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2596 AC_MSG_RESULT(newlib)
2598 CLOCALE_H=config/locale/generic/c_locale.h
2599 CLOCALE_CC=config/locale/generic/c_locale.cc
2600 CCODECVT_CC=config/locale/generic/codecvt_members.cc
2601 CCOLLATE_CC=config/locale/generic/collate_members.cc
2602 CCTYPE_CC=config/locale/newlib/ctype_members.cc
2603 CMESSAGES_H=config/locale/generic/messages_members.h
2604 CMESSAGES_CC=config/locale/generic/messages_members.cc
2605 CMONEY_CC=config/locale/generic/monetary_members.cc
2606 CNUMERIC_CC=config/locale/generic/numeric_members.cc
2607 CTIME_H=config/locale/generic/time_members.h
2608 CTIME_CC=config/locale/generic/time_members.cc
2609 CLOCALE_INTERNAL_H=config/locale/generic/c++locale_internal.h
2613 # This is where the testsuite looks for locale catalogs, using the
2614 # -DLOCALEDIR define during testsuite compilation.
2615 glibcxx_localedir=${glibcxx_builddir}/po/share/locale
2616 AC_SUBST(glibcxx_localedir)
2618 # A standalone libintl (e.g., GNU libintl) may be in use.
2619 if test $USE_NLS = yes; then
2620 AC_CHECK_HEADERS([libintl.h], [], USE_NLS=no)
2621 AC_SEARCH_LIBS(gettext, intl, [], USE_NLS=no)
2623 if test $USE_NLS = yes; then
2624 AC_DEFINE(_GLIBCXX_USE_NLS, 1,
2625 [Define if NLS translations are to be used.])
2630 AC_SUBST(CMESSAGES_H)
2631 AC_SUBST(CCODECVT_CC)
2632 AC_SUBST(CCOLLATE_CC)
2634 AC_SUBST(CMESSAGES_CC)
2636 AC_SUBST(CNUMERIC_CC)
2639 AC_SUBST(CLOCALE_CC)
2640 AC_SUBST(CLOCALE_INTERNAL_H)
2645 dnl Check for which std::allocator base class to use. The choice is
2646 dnl mapped from a subdirectory of include/ext.
2650 AC_DEFUN([GLIBCXX_ENABLE_ALLOCATOR], [
2651 AC_MSG_CHECKING([for std::allocator base class])
2652 GLIBCXX_ENABLE(libstdcxx-allocator,auto,[[[=KIND]]],
2653 [use KIND for target std::allocator base],
2654 [permit new|malloc|yes|no|auto])
2656 # If they didn't use this option switch, or if they specified --enable
2657 # with no specific model, we'll have to look for one. If they
2658 # specified --disable (???), do likewise.
2659 if test $enable_libstdcxx_allocator = no ||
2660 test $enable_libstdcxx_allocator = yes;
2662 enable_libstdcxx_allocator=auto
2665 # Either a known package, or "auto". Auto implies the default choice
2666 # for a particular platform.
2667 enable_libstdcxx_allocator_flag=$enable_libstdcxx_allocator
2669 # Probe for host-specific support if no specific model is specified.
2671 if test $enable_libstdcxx_allocator_flag = auto; then
2672 case ${target_os} in
2673 linux* | gnu* | kfreebsd*-gnu | knetbsd*-gnu)
2674 enable_libstdcxx_allocator_flag=new
2677 enable_libstdcxx_allocator_flag=new
2681 AC_MSG_RESULT($enable_libstdcxx_allocator_flag)
2684 # Set configure bits for specified locale package
2685 case ${enable_libstdcxx_allocator_flag} in
2687 ALLOCATOR_H=config/allocator/malloc_allocator_base.h
2688 ALLOCATOR_NAME=__gnu_cxx::malloc_allocator
2691 ALLOCATOR_H=config/allocator/new_allocator_base.h
2692 ALLOCATOR_NAME=__gnu_cxx::new_allocator
2696 GLIBCXX_CONDITIONAL(ENABLE_ALLOCATOR_NEW,
2697 test $enable_libstdcxx_allocator_flag = new)
2698 AC_SUBST(ALLOCATOR_H)
2699 AC_SUBST(ALLOCATOR_NAME)
2704 dnl Check for whether the Boost-derived checks should be turned on.
2706 dnl --enable-concept-checks turns them on.
2707 dnl --disable-concept-checks leaves them off.
2708 dnl + Usage: GLIBCXX_ENABLE_CONCEPT_CHECKS[(DEFAULT)]
2709 dnl Where DEFAULT is either `yes' or `no'.
2711 AC_DEFUN([GLIBCXX_ENABLE_CONCEPT_CHECKS], [
2712 GLIBCXX_ENABLE(concept-checks,$1,,[use Boost-derived template checks])
2713 if test $enable_concept_checks = yes; then
2714 AC_DEFINE(_GLIBCXX_CONCEPT_CHECKS, 1,
2715 [Define to use concept checking code from the boost libraries.])
2720 dnl Use extern templates.
2722 dnl --enable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 1
2723 dnl --disable-extern-template defines _GLIBCXX_EXTERN_TEMPLATE to 0
2725 dnl + Usage: GLIBCXX_ENABLE_TEMPLATE[(DEFAULT)]
2726 dnl Where DEFAULT is `yes' or `no'.
2728 AC_DEFUN([GLIBCXX_ENABLE_EXTERN_TEMPLATE], [
2730 GLIBCXX_ENABLE(extern-template,$1,,[enable extern template])
2732 AC_MSG_CHECKING([for extern template support])
2733 AC_MSG_RESULT([$enable_extern_template])
2735 GLIBCXX_CONDITIONAL(ENABLE_EXTERN_TEMPLATE, test $enable_extern_template = yes)
2739 dnl Use vtable verification.
2741 dnl --enable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 1
2742 dnl --disable-vtable-verify defines _GLIBCXX_VTABLE_VERIFY to 0
2744 dnl + Usage: GLIBCXX_ENABLE_VTABLE_VERIFY[(DEFAULT)]
2745 dnl Where DEFAULT is `yes' or `no'.
2747 AC_DEFUN([GLIBCXX_ENABLE_VTABLE_VERIFY], [
2749 GLIBCXX_ENABLE(vtable-verify,$1,,[enable vtable verify])
2751 AC_MSG_CHECKING([for vtable verify support])
2752 AC_MSG_RESULT([$enable_vtable_verify])
2755 if test $enable_vtable_verify = yes; then
2756 case ${target_os} in
2758 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-lvtv,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2759 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2763 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u,_vtable_map_vars_start -Wl,-u,_vtable_map_vars_end"
2764 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-rpath,${toplevel_builddir}/libvtv/.libs"
2767 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2768 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,-R -Wl,${toplevel_builddir}/libvtv/.libs"
2771 VTV_CXXFLAGS="-fvtable-verify=std -Wl,-u_vtable_map_vars_start,-u_vtable_map_vars_end"
2772 VTV_CXXLINKFLAGS="-L${toplevel_builddir}/libvtv/.libs -Wl,--rpath -Wl,${toplevel_builddir}/libvtv/.libs"
2775 VTV_PCH_CXXFLAGS="-fvtable-verify=std"
2782 AC_SUBST(VTV_CXXFLAGS)
2783 AC_SUBST(VTV_PCH_CXXFLAGS)
2784 AC_SUBST(VTV_CXXLINKFLAGS)
2785 AM_CONDITIONAL(VTV_CYGMIN, test x$vtv_cygmin = xyes)
2786 GLIBCXX_CONDITIONAL(ENABLE_VTABLE_VERIFY, test $enable_vtable_verify = yes)
2790 dnl Check for parallel mode pre-requisites, including OpenMP support.
2792 dnl + Usage: GLIBCXX_ENABLE_PARALLEL
2794 AC_DEFUN([GLIBCXX_ENABLE_PARALLEL], [
2798 # See if configured libgomp/omp.h exists. (libgomp may be in
2799 # noconfigdirs but not explicitly disabled.)
2800 if echo " ${TARGET_CONFIGDIRS} " | grep " libgomp " > /dev/null 2>&1 ; then
2801 enable_parallel=yes;
2803 AC_MSG_NOTICE([target-libgomp not built])
2806 AC_MSG_CHECKING([for parallel mode support])
2807 AC_MSG_RESULT([$enable_parallel])
2812 dnl Check for which I/O library to use: stdio and POSIX, or pure stdio.
2814 dnl Default is stdio_posix.
2816 AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
2817 AC_MSG_CHECKING([for underlying I/O to use])
2818 GLIBCXX_ENABLE(cstdio,stdio,[[[=PACKAGE]]],
2819 [use target-specific I/O package], [permit stdio|stdio_posix|stdio_pure])
2821 # The only available I/O model is based on stdio, via basic_file_stdio.
2822 # The default "stdio" is actually "stdio + POSIX" because it uses fdopen(3)
2823 # to get a file descriptor and then uses read(3) and write(3) with it.
2824 # The "stdio_pure" model doesn't use fdopen and only uses FILE* for I/O.
2825 case ${enable_cstdio} in
2827 CSTDIO_H=config/io/c_io_stdio.h
2828 BASIC_FILE_H=config/io/basic_file_stdio.h
2829 BASIC_FILE_CC=config/io/basic_file_stdio.cc
2831 if test "x$enable_cstdio" = "xstdio_pure" ; then
2832 AC_MSG_RESULT([stdio (without POSIX read/write)])
2833 AC_DEFINE(_GLIBCXX_USE_STDIO_PURE, 1,
2834 [Define to restrict std::__basic_file<> to stdio APIs.])
2836 AC_MSG_RESULT([stdio (with POSIX read/write)])
2842 AC_SUBST(BASIC_FILE_H)
2843 AC_SUBST(BASIC_FILE_CC)
2848 dnl Check for "unusual" flags to pass to the compiler while building.
2850 dnl --enable-cxx-flags='-foo -bar -baz' is a general method for passing
2851 dnl experimental flags such as -fpch, -fIMI, -Dfloat=char, etc.
2852 dnl --disable-cxx-flags passes nothing.
2853 dnl + See http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00131.html
2854 dnl http://gcc.gnu.org/ml/libstdc++/2000-q2/msg00284.html
2855 dnl http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00035.html
2856 dnl + Usage: GLIBCXX_ENABLE_CXX_FLAGS(default flags)
2857 dnl If "default flags" is an empty string, the effect is the same
2858 dnl as --disable or --enable=no.
2860 AC_DEFUN([GLIBCXX_ENABLE_CXX_FLAGS], [dnl
2861 AC_MSG_CHECKING([for extra compiler flags for building])
2862 GLIBCXX_ENABLE(cxx-flags,$1,[=FLAGS],
2863 [pass compiler FLAGS when building library],
2864 [case "x$enable_cxx_flags" in
2865 xno | x) enable_cxx_flags= ;;
2867 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2870 # Run through flags (either default or command-line) and set anything
2871 # extra (e.g., #defines) that must accompany particular g++ options.
2872 if test -n "$enable_cxx_flags"; then
2873 for f in $enable_cxx_flags; do
2877 *) # and we're trying to pass /what/ exactly?
2878 AC_MSG_ERROR([compiler flags start with a -]) ;;
2883 EXTRA_CXX_FLAGS="$enable_cxx_flags"
2884 AC_MSG_RESULT($EXTRA_CXX_FLAGS)
2885 AC_SUBST(EXTRA_CXX_FLAGS)
2890 dnl Check to see if debugging libraries are to be built.
2892 dnl --enable-libstdcxx-debug
2893 dnl builds a separate set of debugging libraries in addition to the
2894 dnl normal (shared, static) libstdc++ binaries.
2896 dnl --disable-libstdcxx-debug
2897 dnl builds only one (non-debug) version of libstdc++.
2899 dnl --enable-libstdcxx-debug-flags=FLAGS
2900 dnl iff --enable-debug == yes, then use FLAGS to build the debug library.
2902 dnl + Usage: GLIBCXX_ENABLE_DEBUG[(DEFAULT)]
2903 dnl Where DEFAULT is either `yes' or `no'.
2905 AC_DEFUN([GLIBCXX_ENABLE_DEBUG], [
2906 AC_MSG_CHECKING([for additional debug build])
2908 GLIBCXX_ENABLE(libstdcxx-debug,$1,,[build extra debug library])
2909 if test x$enable_libstdcxx_debug = xyes; then
2910 if test -f $toplevel_builddir/../stage_final \
2911 && test -f $toplevel_builddir/../stage_current; then
2912 stage_final=`cat $toplevel_builddir/../stage_final`
2913 stage_current=`cat $toplevel_builddir/../stage_current`
2914 if test x$stage_current != x$stage_final ; then
2915 skip_debug_build=" (skipped for bootstrap stage $stage_current)"
2916 enable_libstdcxx_debug=no
2920 AC_MSG_RESULT($enable_libstdcxx_debug$skip_debug_build)
2921 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_DEBUG, test $enable_libstdcxx_debug = yes)
2926 dnl Check for explicit debug flags.
2928 dnl --enable-libstdcxx-debug-flags='-O1'
2929 dnl is a general method for passing flags to be used when
2930 dnl building debug libraries with --enable-libstdcxx-debug.
2932 dnl --disable-libstdcxx-debug-flags does nothing.
2933 dnl + Usage: GLIBCXX_ENABLE_DEBUG_FLAGS(default flags)
2934 dnl If "default flags" is an empty string, the effect is the same
2935 dnl as --disable or --enable=no.
2937 AC_DEFUN([GLIBCXX_ENABLE_DEBUG_FLAGS], [
2938 GLIBCXX_ENABLE(libstdcxx-debug-flags,[$1],[=FLAGS],
2939 [pass compiler FLAGS when building debug library],
2940 [case "x$enable_libstdcxx_debug_flags" in
2941 xno | x) enable_libstdcxx_debug_flags= ;;
2943 *) AC_MSG_ERROR(_g_switch needs compiler flags as arguments) ;;
2946 # Option parsed, now set things appropriately
2947 DEBUG_FLAGS="$enable_libstdcxx_debug_flags"
2948 AC_SUBST(DEBUG_FLAGS)
2950 AC_MSG_NOTICE([Debug build flags set to $DEBUG_FLAGS])
2955 dnl Check if the user only wants a freestanding library implementation.
2957 dnl --disable-hosted-libstdcxx will turn off most of the library build,
2958 dnl installing only the headers required by [17.4.1.3] and the language
2959 dnl support library. More than that will be built (to keep the Makefiles
2960 dnl conveniently clean), but not installed.
2962 dnl Also define --disable-libstdcxx-hosted as an alias for
2963 dnl --disable-hosted-libstdcxx but fail if both are given
2964 dnl and their values do not agree.
2967 dnl is_hosted (yes/no)
2970 dnl _GLIBCXX_HOSTED (always defined, either to 1 or 0)
2972 AC_DEFUN([GLIBCXX_ENABLE_HOSTED], [
2973 AC_ARG_ENABLE([hosted-libstdcxx],
2974 AC_HELP_STRING([--disable-hosted-libstdcxx],
2975 [only build freestanding C++ runtime support]),
2976 [enable_hosted_libstdcxx_was_given=yes],
2979 enable_hosted_libstdcxx=no
2982 case "${with_newlib}-${with_headers}" in
2983 no-no) enable_hosted_libstdcxx=no ;;
2984 *) enable_hosted_libstdcxx=yes ;;
2989 # Because most configure args are --enable-libstdcxx-foo add an alias
2990 # of that form for --enable-hosted-libstdcxx.
2991 AC_ARG_ENABLE([libstdcxx-hosted],
2992 AC_HELP_STRING([--disable-libstdcxx-hosted],
2993 [alias for --disable-hosted-libstdcxx]),
2994 [if test "$enable_hosted_libstdcxx_was_given" = yes; then
2995 if test "$enable_hosted_libstdcxx" != "$enableval"; then
2996 AC_MSG_ERROR([--enable-libstdcxx-hosted=$enableval conflicts with --enable-hosted-libstdcxx=$enable_hosted_libstdcxx])
2999 enable_hosted_libstdcxx=${enableval}
3004 if test "$enable_hosted_libstdcxx" = no; then
3005 AC_MSG_NOTICE([Only freestanding libraries will be built])
3009 enable_libstdcxx_pch=no
3010 if test "x$with_headers" = xno; then
3011 freestanding_flags="-ffreestanding"
3015 hosted_define=__STDC_HOSTED__
3017 GLIBCXX_CONDITIONAL(GLIBCXX_HOSTED, test $is_hosted = yes)
3018 AC_DEFINE_UNQUOTED(_GLIBCXX_HOSTED, $hosted_define,
3019 [Define to 1 if a full hosted library is built, or 0 if freestanding.])
3020 FREESTANDING_FLAGS="$freestanding_flags"
3021 AC_SUBST(FREESTANDING_FLAGS)
3026 dnl Check if the user wants a non-verbose library implementation.
3028 dnl --disable-libstdcxx-verbose will turn off descriptive messages to
3029 dnl standard error on termination.
3032 dnl _GLIBCXX_VERBOSE (always defined, either to 1 or 0)
3034 AC_DEFUN([GLIBCXX_ENABLE_VERBOSE], [
3035 AC_ARG_ENABLE([libstdcxx-verbose],
3036 AC_HELP_STRING([--disable-libstdcxx-verbose],
3037 [disable termination messages to standard error]),,
3038 [enable_libstdcxx_verbose=yes])
3039 if test x"$enable_libstdcxx_verbose" = xyes; then
3042 AC_MSG_NOTICE([verbose termination messages are disabled])
3045 AC_DEFINE_UNQUOTED(_GLIBCXX_VERBOSE, $verbose_define,
3046 [Define to 1 if a verbose library is built, or 0 otherwise.])
3051 dnl Check for template specializations for the 'long long' type.
3052 dnl The result determines only whether 'long long' I/O is enabled; things
3053 dnl like numeric_limits<> specializations are always available.
3055 dnl --enable-long-long defines _GLIBCXX_USE_LONG_LONG
3056 dnl --disable-long-long leaves _GLIBCXX_USE_LONG_LONG undefined
3057 dnl + Usage: GLIBCXX_ENABLE_LONG_LONG[(DEFAULT)]
3058 dnl Where DEFAULT is either `yes' or `no'.
3060 AC_DEFUN([GLIBCXX_ENABLE_LONG_LONG], [
3061 GLIBCXX_ENABLE(long-long,$1,,[enable template specializations for 'long long'])
3062 if test $enable_long_long = yes; then
3063 AC_DEFINE(_GLIBCXX_USE_LONG_LONG, 1,
3064 [Define if code specialized for long long should be used.])
3066 AC_MSG_CHECKING([for enabled long long specializations])
3067 AC_MSG_RESULT([$enable_long_long])
3072 dnl Check for decimal floating point.
3074 dnl http://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html#Decimal-Float
3076 dnl This checks to see if the host supports decimal floating point types.
3079 dnl _GLIBCXX_USE_DECIMAL_FLOAT
3081 AC_DEFUN([GLIBCXX_ENABLE_DECIMAL_FLOAT], [
3083 # Fake what AC_TRY_COMPILE does, without linking as this is
3084 # unnecessary for this test.
3086 cat > conftest.$ac_ext << EOF
3087 [#]line __oline__ "configure"
3097 AC_MSG_CHECKING([for ISO/IEC TR 24733 ])
3098 if AC_TRY_EVAL(ac_compile); then
3099 AC_DEFINE(_GLIBCXX_USE_DECIMAL_FLOAT, 1,
3100 [Define if ISO/IEC TR 24733 decimal floating point types are supported on this host.])
3105 AC_MSG_RESULT($enable_dfp)
3110 dnl Check for GNU 128-bit floating point type.
3112 dnl Note: also checks that the type isn't a standard types.
3117 AC_DEFUN([GLIBCXX_ENABLE_FLOAT128], [
3122 # Fake what AC_TRY_COMPILE does, without linking as this is
3123 # unnecessary for this test.
3125 cat > conftest.$ac_ext << EOF
3126 [#]line __oline__ "configure"
3127 template<typename T1, typename T2>
3129 { typedef T2 type; };
3131 template<typename T>
3136 typename same<double, __float128>::type f1;
3137 typename same<long double, __float128>::type f2;
3141 AC_MSG_CHECKING([for __float128])
3142 if AC_TRY_EVAL(ac_compile); then
3147 AC_MSG_RESULT($enable_float128)
3148 GLIBCXX_CONDITIONAL(ENABLE_FLOAT128, test $enable_float128 = yes)
3155 dnl Check for template specializations for the 'wchar_t' type.
3157 dnl --enable-wchar_t defines _GLIBCXX_USE_WCHAR_T
3158 dnl --disable-wchar_t leaves _GLIBCXX_USE_WCHAR_T undefined
3159 dnl + Usage: GLIBCXX_ENABLE_WCHAR_T[(DEFAULT)]
3160 dnl Where DEFAULT is either `yes' or `no'.
3162 dnl Necessary support must also be present.
3164 AC_DEFUN([GLIBCXX_ENABLE_WCHAR_T], [
3165 GLIBCXX_ENABLE(wchar_t,$1,,[enable template specializations for 'wchar_t'])
3167 # Test wchar.h for mbstate_t, which is needed for char_traits and fpos.
3168 AC_CHECK_HEADERS(wchar.h, ac_has_wchar_h=yes, ac_has_wchar_h=no)
3169 AC_MSG_CHECKING([for mbstate_t])
3170 AC_TRY_COMPILE([#include <wchar.h>],
3171 [mbstate_t teststate;],
3172 have_mbstate_t=yes, have_mbstate_t=no)
3173 AC_MSG_RESULT($have_mbstate_t)
3174 if test x"$have_mbstate_t" = xyes; then
3175 AC_DEFINE(HAVE_MBSTATE_T,1,[Define if mbstate_t exists in wchar.h.])
3178 # Test it always, for use in GLIBCXX_ENABLE_C99, together with
3180 AC_CHECK_HEADERS(wctype.h, ac_has_wctype_h=yes, ac_has_wctype_h=no)
3182 if test x"$enable_wchar_t" = x"yes"; then
3187 if test x"$ac_has_wchar_h" = xyes &&
3188 test x"$ac_has_wctype_h" = xyes; then
3189 AC_TRY_COMPILE([#include <wchar.h>
3250 ],[],[], [enable_wchar_t=no])
3258 if test x"$enable_wchar_t" = x"yes"; then
3259 AC_DEFINE(_GLIBCXX_USE_WCHAR_T, 1,
3260 [Define if code specialized for wchar_t should be used.])
3263 AC_MSG_CHECKING([for enabled wchar_t specializations])
3264 AC_MSG_RESULT([$enable_wchar_t])
3269 dnl Check to see if building and using a C++ precompiled header can be done.
3271 dnl --enable-libstdcxx-pch=yes
3272 dnl default, this shows intent to use stdc++.h.gch If it looks like it
3273 dnl may work, after some light-hearted attempts to puzzle out compiler
3274 dnl support, flip bits on in include/Makefile.am
3276 dnl --disable-libstdcxx-pch
3277 dnl turns off attempts to use or build stdc++.h.gch.
3280 dnl glibcxx_PCHFLAGS
3282 AC_DEFUN([GLIBCXX_ENABLE_PCH], [
3283 GLIBCXX_ENABLE(libstdcxx-pch,$1,,[build pre-compiled libstdc++ headers])
3284 if test $enable_libstdcxx_pch = yes; then
3285 AC_CACHE_CHECK([for compiler with PCH support],
3286 [glibcxx_cv_prog_CXX_pch],
3287 [ac_save_CXXFLAGS="$CXXFLAGS"
3288 CXXFLAGS="$CXXFLAGS -Werror -Winvalid-pch -Wno-deprecated"
3291 echo '#include <math.h>' > conftest.h
3292 if $CXX $CXXFLAGS $CPPFLAGS -x c++-header conftest.h \
3293 -o conftest.h.gch 1>&5 2>&1 &&
3294 echo '#error "pch failed"' > conftest.h &&
3295 echo '#include "conftest.h"' > conftest.cc &&
3296 $CXX -c $CXXFLAGS $CPPFLAGS conftest.cc 1>&5 2>&1 ;
3298 glibcxx_cv_prog_CXX_pch=yes
3300 glibcxx_cv_prog_CXX_pch=no
3303 CXXFLAGS=$ac_save_CXXFLAGS
3306 enable_libstdcxx_pch=$glibcxx_cv_prog_CXX_pch
3309 AC_MSG_CHECKING([for enabled PCH])
3310 AC_MSG_RESULT([$enable_libstdcxx_pch])
3312 GLIBCXX_CONDITIONAL(GLIBCXX_BUILD_PCH, test $enable_libstdcxx_pch = yes)
3313 if test $enable_libstdcxx_pch = yes; then
3314 glibcxx_PCHFLAGS="-include bits/stdc++.h"
3318 AC_SUBST(glibcxx_PCHFLAGS)
3323 dnl Check for atomic builtins.
3325 dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
3327 dnl This checks to see if the host supports the compiler-generated
3328 dnl builtins for atomic operations for various integral sizes. Note, this
3329 dnl is intended to be an all-or-nothing switch, so all the atomic operations
3330 dnl that are used should be checked.
3333 dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
3335 AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
3338 old_CXXFLAGS="$CXXFLAGS"
3340 # Do link tests if possible, instead asm tests, limited to some platforms
3341 # see discussion in PR target/40134, PR libstdc++/40133 and the thread
3342 # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html
3343 atomic_builtins_link_tests=no
3344 if test x$gcc_no_link != xyes; then
3345 # Can do link tests. Limit to some tested platforms
3347 *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*)
3348 atomic_builtins_link_tests=yes
3353 if test x$atomic_builtins_link_tests = xyes; then
3357 CXXFLAGS="$CXXFLAGS -fno-exceptions"
3359 AC_CACHE_CHECK([for atomic builtins for bool],
3360 glibcxx_cv_atomic_bool, [
3363 [typedef bool atomic_type;
3367 // N.B. __atomic_fetch_add is not supported for bool.
3368 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3370 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3371 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3373 [glibcxx_cv_atomic_bool=yes],
3374 [glibcxx_cv_atomic_bool=no])
3377 AC_CACHE_CHECK([for atomic builtins for short],
3378 glibcxx_cv_atomic_short, [
3381 [typedef short atomic_type;
3385 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3386 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3388 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3389 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3391 [glibcxx_cv_atomic_short=yes],
3392 [glibcxx_cv_atomic_short=no])
3395 AC_CACHE_CHECK([for atomic builtins for int],
3396 glibcxx_cv_atomic_int, [
3399 [typedef int atomic_type;
3403 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3404 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3406 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3407 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3409 [glibcxx_cv_atomic_int=yes],
3410 [glibcxx_cv_atomic_int=no])
3413 AC_CACHE_CHECK([for atomic builtins for long long],
3414 glibcxx_cv_atomic_long_long, [
3417 [typedef long long atomic_type;
3421 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3422 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3424 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3425 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3427 [glibcxx_cv_atomic_long_long=yes],
3428 [glibcxx_cv_atomic_long_long=no])
3435 # Compile unoptimized.
3438 # Fake what AC_TRY_COMPILE does.
3440 cat > conftest.$ac_ext << EOF
3441 [#]line __oline__ "configure"
3444 typedef bool atomic_type;
3448 // N.B. __atomic_fetch_add is not supported for bool.
3449 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3451 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3452 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3458 AC_MSG_CHECKING([for atomic builtins for bool])
3459 if AC_TRY_EVAL(ac_compile); then
3460 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3461 glibcxx_cv_atomic_bool=no
3463 glibcxx_cv_atomic_bool=yes
3466 AC_MSG_RESULT($glibcxx_cv_atomic_bool)
3469 cat > conftest.$ac_ext << EOF
3470 [#]line __oline__ "configure"
3473 typedef short atomic_type;
3477 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3478 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3480 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3481 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3487 AC_MSG_CHECKING([for atomic builtins for short])
3488 if AC_TRY_EVAL(ac_compile); then
3489 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3490 glibcxx_cv_atomic_short=no
3492 glibcxx_cv_atomic_short=yes
3495 AC_MSG_RESULT($glibcxx_cv_atomic_short)
3498 cat > conftest.$ac_ext << EOF
3499 [#]line __oline__ "configure"
3502 // NB: _Atomic_word not necessarily int.
3503 typedef int atomic_type;
3507 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3508 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3510 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3511 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3517 AC_MSG_CHECKING([for atomic builtins for int])
3518 if AC_TRY_EVAL(ac_compile); then
3519 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3520 glibcxx_cv_atomic_int=no
3522 glibcxx_cv_atomic_int=yes
3525 AC_MSG_RESULT($glibcxx_cv_atomic_int)
3528 cat > conftest.$ac_ext << EOF
3529 [#]line __oline__ "configure"
3532 typedef long long atomic_type;
3536 __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
3537 __atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
3539 __atomic_test_and_set(&c1, __ATOMIC_RELAXED);
3540 __atomic_load_n(&c1, __ATOMIC_RELAXED);
3546 AC_MSG_CHECKING([for atomic builtins for long long])
3547 if AC_TRY_EVAL(ac_compile); then
3548 if grep __atomic_ conftest.s >/dev/null 2>&1 ; then
3549 glibcxx_cv_atomic_long_long=no
3551 glibcxx_cv_atomic_long_long=yes
3554 AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
3559 CXXFLAGS="$old_CXXFLAGS"
3562 # Set atomicity_dir to builtins if all but the long long test above passes,
3563 # or if the builtins were already chosen (e.g. by configure.host).
3564 if { test "$glibcxx_cv_atomic_bool" = yes \
3565 && test "$glibcxx_cv_atomic_short" = yes \
3566 && test "$glibcxx_cv_atomic_int" = yes; } \
3567 || test "$atomicity_dir" = "cpu/generic/atomicity_builtins"; then
3568 AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS, 1,
3569 [Define if the compiler supports C++11 atomics.])
3570 atomicity_dir=cpu/generic/atomicity_builtins
3573 # If still generic, set to mutex.
3574 if test $atomicity_dir = "cpu/generic" ; then
3575 atomicity_dir=cpu/generic/atomicity_mutex
3576 AC_MSG_WARN([No native atomic operations are provided for this platform.])
3577 if test "x$target_thread_file" = xsingle; then
3578 AC_MSG_WARN([They cannot be faked when thread support is disabled.])
3579 AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
3581 AC_MSG_WARN([They will be faked using a mutex.])
3582 AC_MSG_WARN([Performance of certain classes will degrade as a result.])
3589 dnl Set default lock policy for synchronizing shared_ptr reference counting.
3591 dnl --with-libstdcxx-lock-policy=auto
3592 dnl Use atomic operations for shared_ptr reference counting only if
3593 dnl the default target supports atomic compare-and-swap.
3594 dnl --with-libstdcxx-lock-policy=atomic
3595 dnl Use atomic operations for shared_ptr reference counting.
3596 dnl --with-libstdcxx-lock-policy=mutex
3597 dnl Use a mutex to synchronize shared_ptr reference counting.
3599 dnl This controls the value of __gnu_cxx::__default_lock_policy, which
3600 dnl determines how shared_ptr reference counts are synchronized.
3601 dnl The option "atomic" means that atomic operations should be used,
3602 dnl "mutex" means that a mutex will be used. The default option, "auto",
3603 dnl will check if the target supports the compiler-generated builtins
3604 dnl for atomic compare-and-swap operations for 2-byte and 4-byte integers,
3605 dnl and will use "atomic" if supported, "mutex" otherwise.
3606 dnl This option is ignored if the thread model used by GCC is "single",
3607 dnl as no synchronization is used at all in that case.
3608 dnl This option affects the library ABI (except in the "single" thread model).
3610 dnl Defines _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY to 1 if atomics should be used.
3612 AC_DEFUN([GLIBCXX_ENABLE_LOCK_POLICY], [
3614 AC_ARG_WITH([libstdcxx-lock-policy],
3615 AC_HELP_STRING([--with-libstdcxx-lock-policy={atomic,mutex,auto}],
3616 [synchronization policy for shared_ptr reference counting [default=auto]]),
3617 [libstdcxx_atomic_lock_policy=$withval],
3618 [libstdcxx_atomic_lock_policy=auto])
3620 case "$libstdcxx_atomic_lock_policy" in
3621 atomic|mutex|auto) ;;
3622 *) AC_MSG_ERROR([Invalid argument for --with-libstdcxx-lock-policy]) ;;
3624 AC_MSG_CHECKING([for lock policy for shared_ptr reference counts])
3626 if test x"$libstdcxx_atomic_lock_policy" = x"auto"; then
3629 ac_save_CXXFLAGS="$CXXFLAGS"
3631 dnl Why do we care about 2-byte CAS on targets with 4-byte _Atomic_word?!
3632 dnl Why don't we check 8-byte CAS for sparc64, where _Atomic_word is long?!
3633 dnl New targets should only check for CAS for the _Atomic_word type.
3636 # error "Defaulting to mutex-based locks for ABI compatibility"
3638 #if ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
3639 # error "No 2-byte compare-and-swap"
3640 #elif ! defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
3641 # error "No 4-byte compare-and-swap"
3644 [libstdcxx_atomic_lock_policy=atomic],
3645 [libstdcxx_atomic_lock_policy=mutex])
3647 CXXFLAGS="$ac_save_CXXFLAGS"
3650 if test x"$libstdcxx_atomic_lock_policy" = x"atomic"; then
3651 AC_MSG_RESULT(atomic)
3652 AC_DEFINE(HAVE_ATOMIC_LOCK_POLICY,1,
3653 [Defined if shared_ptr reference counting should use atomic operations.])
3655 AC_MSG_RESULT(mutex)
3661 dnl Allow visibility attributes to be used on namespaces, objects, etc.
3663 dnl --enable-libstdcxx-visibility enables attempt to use visibility attributes.
3664 dnl --disable-libstdcxx-visibility turns off all use of visibility attributes.
3665 dnl + Usage: GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY[(DEFAULT)]
3666 dnl Where DEFAULT is 'yes'.
3668 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_VISIBILITY], [
3669 GLIBCXX_ENABLE(libstdcxx-visibility,$1,,[enables visibility safe usage])
3671 if test x$enable_libstdcxx_visibility = xyes ; then
3672 dnl all hail libgfortran
3673 dnl Check whether the target supports hidden visibility.
3674 AC_CACHE_CHECK([whether the target supports hidden visibility],
3675 glibcxx_cv_have_attribute_visibility, [
3676 save_CFLAGS="$CFLAGS"
3677 CFLAGS="$CFLAGS -Werror"
3678 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
3679 [], glibcxx_cv_have_attribute_visibility=yes,
3680 glibcxx_cv_have_attribute_visibility=no)
3681 CFLAGS="$save_CFLAGS"])
3682 if test $glibcxx_cv_have_attribute_visibility = no; then
3683 enable_libstdcxx_visibility=no
3687 GLIBCXX_CONDITIONAL(ENABLE_VISIBILITY, test $enable_libstdcxx_visibility = yes)
3688 AC_MSG_NOTICE([visibility supported: $enable_libstdcxx_visibility])
3693 dnl Add version tags to symbols in shared library (or not), additionally
3694 dnl marking other symbols as private/local (or not).
3696 dnl Sets libtool_VERSION, and determines shared library SONAME.
3698 dnl This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
3700 dnl --enable-symvers=style adds a version script to the linker call when
3701 dnl creating the shared library. The choice of version script is
3702 dnl controlled by 'style'.
3703 dnl --disable-symvers does not.
3705 dnl + Usage: GLIBCXX_ENABLE_SYMVERS[(DEFAULT)]
3706 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
3707 dnl choose a default style based on linker characteristics. Passing
3708 dnl 'no' disables versioning.
3710 AC_DEFUN([GLIBCXX_ENABLE_SYMVERS], [
3712 GLIBCXX_ENABLE(symvers,$1,[[[=STYLE]]],
3713 [enables symbol versioning of the shared library],
3714 [permit yes|no|gnu|gnu-versioned-namespace|darwin|darwin-export|sun])
3716 # If we never went through the GLIBCXX_CHECK_LINKER_FEATURES macro, then we
3717 # don't know enough about $LD to do tricks...
3718 AC_REQUIRE([GLIBCXX_CHECK_LINKER_FEATURES])
3719 # Sun style symbol versions needs GNU c++filt for make_sunver.pl to work
3720 # with extern "C++" in version scripts.
3721 AC_REQUIRE([GCC_PROG_GNU_CXXFILT])
3723 # Turn a 'yes' into a suitable default.
3724 if test x$enable_symvers = xyes ; then
3725 if test $enable_shared = no || test "x$LD" = x || test x$gcc_no_link = xyes; then
3728 if test $with_gnu_ld = yes ; then
3729 case ${target_os} in
3731 enable_symvers=no ;;
3733 enable_symvers=gnu ;;
3736 case ${target_os} in
3738 enable_symvers=darwin ;;
3739 # Sun symbol versioning exists since Solaris 2.5.
3740 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
3741 # make_sunver.pl needs GNU c++filt to support extern "C++" in
3742 # version scripts, so disable symbol versioning if none can be
3744 if test -z "$ac_cv_path_CXXFILT"; then
3745 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3746 AC_MSG_WARN([=== no GNU c++filt could be found.])
3747 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3754 enable_symvers=no ;;
3760 # Check to see if 'darwin' or 'darwin-export' can win.
3761 if test x$enable_symvers = xdarwin-export ; then
3762 enable_symvers=darwin
3765 # Check if 'sun' was requested on non-Solaris 2 platforms.
3766 if test x$enable_symvers = xsun ; then
3767 case ${target_os} in
3773 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
3774 AC_MSG_WARN([=== you are not targetting Solaris 2.])
3775 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3781 # Check to see if 'gnu' can win.
3782 if test $enable_symvers = gnu ||
3783 test $enable_symvers = gnu-versioned-namespace ||
3784 test $enable_symvers = sun; then
3785 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
3786 AC_MSG_CHECKING([for shared libgcc])
3787 ac_save_CFLAGS="$CFLAGS"
3789 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes, glibcxx_shared_libgcc=no)
3790 CFLAGS="$ac_save_CFLAGS"
3791 if test $glibcxx_shared_libgcc = no; then
3792 cat > conftest.c <<EOF
3793 int main (void) { return 0; }
3796 glibcxx_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
3797 -shared -shared-libgcc -o conftest.so \
3798 conftest.c -v 2>&1 >/dev/null \
3799 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
3801 rm -f conftest.c conftest.so
3802 if test x${glibcxx_libgcc_s_suffix+set} = xset; then
3803 CFLAGS=" -lgcc_s$glibcxx_libgcc_s_suffix"
3804 AC_TRY_LINK(, [return 0;], glibcxx_shared_libgcc=yes)
3805 CFLAGS="$ac_save_CFLAGS"
3808 AC_MSG_RESULT($glibcxx_shared_libgcc)
3810 # For GNU ld, we need at least this version. The format is described in
3811 # GLIBCXX_CHECK_LINKER_FEATURES above.
3812 glibcxx_min_gnu_ld_version=21400
3814 # If no shared libgcc, can't win.
3815 if test $glibcxx_shared_libgcc != yes; then
3816 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3817 AC_MSG_WARN([=== you are not building a shared libgcc_s.])
3818 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3820 elif test $with_gnu_ld != yes && test $enable_symvers = sun; then
3821 : All interesting versions of Sun ld support sun style symbol versioning.
3822 elif test $with_gnu_ld != yes ; then
3824 AC_MSG_WARN([=== You have requested GNU symbol versioning, but])
3825 AC_MSG_WARN([=== you are not using the GNU linker.])
3826 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3828 elif test $glibcxx_ld_is_gold = yes ; then
3829 : All versions of gold support symbol versioning.
3830 elif test $glibcxx_ld_is_mold = yes ; then
3831 : All versions of mold support symbol versioning.
3832 elif test $glibcxx_gnu_ld_version -lt $glibcxx_min_gnu_ld_version ; then
3833 # The right tools, the right setup, but too old. Fallbacks?
3834 AC_MSG_WARN(=== Linker version $glibcxx_gnu_ld_version is too old for)
3835 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
3836 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
3837 AC_MSG_WARN(=== $glibcxx_min_gnu_ld_version or later and rebuild GCC.)
3838 AC_MSG_WARN([=== Symbol versioning will be disabled.])
3843 # For libtool versioning info, format is CURRENT:REVISION:AGE
3844 libtool_VERSION=6:31:0
3846 # Everything parsed; figure out what files and settings to use.
3847 case $enable_symvers in
3849 SYMVER_FILE=config/abi/pre/none.ver
3852 SYMVER_FILE=config/abi/pre/gnu.ver
3853 AC_DEFINE(_GLIBCXX_SYMVER_GNU, 1,
3854 [Define to use GNU versioning in the shared library.])
3856 gnu-versioned-namespace)
3857 libtool_VERSION=8:0:0
3858 SYMVER_FILE=config/abi/pre/gnu-versioned-namespace.ver
3859 AC_DEFINE(_GLIBCXX_SYMVER_GNU_NAMESPACE, 1,
3860 [Define to use GNU namespace versioning in the shared library.])
3863 SYMVER_FILE=config/abi/pre/gnu.ver
3864 AC_DEFINE(_GLIBCXX_SYMVER_DARWIN, 1,
3865 [Define to use darwin versioning in the shared library.])
3868 SYMVER_FILE=config/abi/pre/gnu.ver
3869 AC_DEFINE(_GLIBCXX_SYMVER_SUN, 1,
3870 [Define to use Sun versioning in the shared library.])
3874 if test x$enable_symvers != xno ; then
3875 AC_DEFINE(_GLIBCXX_SYMVER, 1,
3876 [Define to use symbol versioning in the shared library.])
3879 AC_CACHE_CHECK([whether the target supports .symver directive],
3880 glibcxx_cv_have_as_symver_directive, [
3881 AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
3882 [], glibcxx_cv_have_as_symver_directive=yes,
3883 glibcxx_cv_have_as_symver_directive=no)])
3884 if test $glibcxx_cv_have_as_symver_directive = yes; then
3885 AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
3886 [Define to 1 if the target assembler supports .symver directive.])
3889 AC_SUBST(SYMVER_FILE)
3890 AC_SUBST(port_specific_symbol_files)
3891 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS, test $enable_symvers != no)
3892 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU, test $enable_symvers = gnu)
3893 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_GNU_NAMESPACE, test $enable_symvers = gnu-versioned-namespace)
3894 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_DARWIN, test $enable_symvers = darwin)
3895 GLIBCXX_CONDITIONAL(ENABLE_SYMVERS_SUN, test $enable_symvers = sun)
3896 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
3898 if test $enable_symvers != no ; then
3899 case ${target_os} in
3900 # The Solaris 2 runtime linker doesn't support the GNU extension of
3901 # binding the same symbol to different versions
3904 # Other platforms with GNU symbol versioning (GNU/Linux, more?) do.
3906 AC_DEFINE(HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT, 1,
3907 [Define to 1 if the target runtime linker supports binding the same symbol to different versions.])
3912 # Now, set up compatibility support, if any.
3913 # In addition, need this to deal with std::size_t mangling in
3914 # src/compatibility.cc. In a perfect world, could use
3915 # typeid(std::size_t).name()[0] to do direct substitution.
3916 AC_MSG_CHECKING([for size_t as unsigned int])
3917 ac_save_CFLAGS="$CFLAGS"
3919 AC_TRY_COMPILE(, [__SIZE_TYPE__* stp; unsigned int* uip; stp = uip;],
3920 [glibcxx_size_t_is_i=yes], [glibcxx_size_t_is_i=no])
3921 CFLAGS=$ac_save_CFLAGS
3922 if test "$glibcxx_size_t_is_i" = yes; then
3923 AC_DEFINE(_GLIBCXX_SIZE_T_IS_UINT, 1, [Define if size_t is unsigned int.])
3925 AC_MSG_RESULT([$glibcxx_size_t_is_i])
3927 AC_MSG_CHECKING([for ptrdiff_t as int])
3928 ac_save_CFLAGS="$CFLAGS"
3930 AC_TRY_COMPILE(, [__PTRDIFF_TYPE__* ptp; int* ip; ptp = ip;],
3931 [glibcxx_ptrdiff_t_is_i=yes], [glibcxx_ptrdiff_t_is_i=no])
3932 CFLAGS=$ac_save_CFLAGS
3933 if test "$glibcxx_ptrdiff_t_is_i" = yes; then
3934 AC_DEFINE(_GLIBCXX_PTRDIFF_T_IS_INT, 1, [Define if ptrdiff_t is int.])
3936 AC_MSG_RESULT([$glibcxx_ptrdiff_t_is_i])
3941 dnl Setup to use the gcc gthr.h thread-specific memory and mutex model.
3942 dnl We must stage the required headers so that they will be installed
3943 dnl with the library (unlike libgcc, the STL implementation is provided
3944 dnl solely within headers). Since we must not inject random user-space
3945 dnl macro names into user-provided C++ code, we first stage into <file>-in
3946 dnl and process to <file> with an output command. The reason for a two-
3947 dnl stage process here is to correctly handle $srcdir!=$objdir without
3948 dnl having to write complex code (the sed commands to clean the macro
3949 dnl namespace are complex and fragile enough as it is). We must also
3950 dnl add a relative path so that -I- is supported properly.
3955 AC_DEFUN([GLIBCXX_ENABLE_THREADS], [
3956 AC_MSG_CHECKING([for thread model used by GCC])
3957 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3958 AC_MSG_RESULT([$target_thread_file])
3959 GCC_AC_THREAD_HEADER([$target_thread_file])
3964 dnl Check if gthread implementation defines the types and functions
3965 dnl required by the c++0x thread library. Conforming gthread
3966 dnl implementations can define __GTHREADS_CXX0X to enable use with c++0x.
3968 dnl GLIBCXX_ENABLE_SYMVERS must be done before this.
3970 AC_DEFUN([GLIBCXX_CHECK_GTHREADS], [
3971 GLIBCXX_ENABLE(libstdcxx-threads,auto,,[enable C++11 threads support])
3973 if test x$enable_libstdcxx_threads = xauto ||
3974 test x$enable_libstdcxx_threads = xyes; then
3979 ac_save_CXXFLAGS="$CXXFLAGS"
3980 CXXFLAGS="$CXXFLAGS -fno-exceptions \
3981 -I${toplevel_srcdir}/libgcc -I${toplevel_builddir}/libgcc"
3983 target_thread_file=`$CXX -v 2>&1 | sed -n 's/^Thread model: //p'`
3984 case $target_thread_file in
3986 CXXFLAGS="$CXXFLAGS -DSUPPORTS_WEAK -DGTHREAD_USE_WEAK -D_PTHREADS"
3989 CXXFLAGS="$CXXFLAGS -D_WIN32_THREADS"
3990 # The support of condition variables is disabled by default in
3991 # the Win32 gthreads library, so enable it on explicit request.
3992 if test x$enable_libstdcxx_threads = xyes; then
3993 CXXFLAGS="$CXXFLAGS -D_WIN32_WINNT=0x0600"
3998 AC_MSG_CHECKING([whether it can be safely assumed that mutex_timedlock is available])
4000 AC_TRY_COMPILE([#include <unistd.h>],
4002 // In case of POSIX threads check _POSIX_TIMEOUTS.
4003 #if (defined(_PTHREADS) \
4004 && (!defined(_POSIX_TIMEOUTS) || _POSIX_TIMEOUTS <= 0))
4006 // In case of Win32 threads there is no support.
4007 #elif defined(_WIN32_THREADS)
4010 ], [ac_gthread_use_mutex_timedlock=1], [ac_gthread_use_mutex_timedlock=0])
4012 AC_DEFINE_UNQUOTED(_GTHREAD_USE_MUTEX_TIMEDLOCK, $ac_gthread_use_mutex_timedlock,
4013 [Define to 1 if mutex_timedlock is available.])
4015 if test $ac_gthread_use_mutex_timedlock = 1 ; then res_mutex_timedlock=yes ;
4016 else res_mutex_timedlock=no ; fi
4017 AC_MSG_RESULT([$res_mutex_timedlock])
4019 AC_MSG_CHECKING([for gthreads library])
4021 AC_TRY_COMPILE([#include "gthr.h"],
4023 #ifndef __GTHREADS_CXX0X
4026 ], [ac_has_gthreads=yes], [ac_has_gthreads=no])
4031 AC_MSG_RESULT([$ac_has_gthreads])
4033 if test x"$ac_has_gthreads" = x"yes"; then
4034 AC_DEFINE(_GLIBCXX_HAS_GTHREADS, 1,
4035 [Define if gthreads library is available.])
4037 # Also check for pthread_rwlock_t for std::shared_timed_mutex in C++14
4038 # but only do so if we're using pthread in the gthread library.
4039 # On VxWorks for example, pthread_rwlock_t is defined in sys/types.h
4040 # but the pthread library is not there by default and the gthread library
4042 AC_TRY_COMPILE([#include "gthr.h"],
4044 #if (!defined(_PTHREADS))
4047 ], [ac_gthread_use_pthreads=yes], [ac_gthread_use_pthreads=no])
4048 if test x"$ac_gthread_use_pthreads" = x"yes"; then
4049 AC_CHECK_TYPE([pthread_rwlock_t],
4050 [AC_DEFINE([_GLIBCXX_USE_PTHREAD_RWLOCK_T], 1,
4051 [Define if POSIX read/write locks are available in <gthr.h>.])],
4053 [#include "gthr.h"])
4056 # See above for the rationale.
4057 if test $target_thread_file = win32; then
4058 CPPFLAGS="$CPPFLAGS -D_WIN32_WINNT=0x0600"
4062 AC_CHECK_HEADER(semaphore.h, [
4063 AC_MSG_CHECKING([for POSIX Semaphores and sem_timedwait])
4066 #include <semaphore.h>
4070 #if !defined _POSIX_TIMEOUTS || _POSIX_TIMEOUTS <= 0
4071 # error "POSIX Timeouts option not supported"
4072 #elif !defined _POSIX_SEMAPHORES || _POSIX_SEMAPHORES <= 0
4073 # error "POSIX Semaphores option not supported"
4075 #if defined SEM_VALUE_MAX
4076 constexpr int sem_value_max = SEM_VALUE_MAX;
4077 #elif defined _POSIX_SEM_VALUE_MAX
4078 constexpr int sem_value_max = _POSIX_SEM_VALUE_MAX;
4080 # error "SEM_VALUE_MAX not available"
4083 sem_init(&sem, 0, sem_value_max);
4084 struct timespec ts = { 0 };
4085 sem_timedwait(&sem, &ts);
4088 [ac_have_posix_semaphore=yes],
4089 [ac_have_posix_semaphore=no])],
4090 [ac_have_posix_semaphore=no])
4092 if test $ac_have_posix_semaphore = yes ; then
4093 AC_DEFINE(HAVE_POSIX_SEMAPHORE,
4095 [Define to 1 if POSIX Semaphores with sem_timedwait are available in <semaphore.h>.])
4097 AC_MSG_RESULT([$ac_have_posix_semaphore])
4099 CXXFLAGS="$ac_save_CXXFLAGS"
4104 # Check whether LC_MESSAGES is available in <locale.h>.
4105 # Ulrich Drepper <drepper@cygnus.com>, 1995.
4107 # This file file be copied and used freely without restrictions. It can
4108 # be used in projects which are not available under the GNU Public License
4109 # but which still want to provide support for the GNU gettext functionality.
4110 # Please note that the actual code is *not* freely available.
4111 AC_DEFUN([AC_LC_MESSAGES], [
4112 AC_CHECK_HEADER(locale.h, [
4113 AC_CACHE_CHECK([for LC_MESSAGES], ac_cv_val_LC_MESSAGES,
4114 [AC_TRY_COMPILE([#include <locale.h>], [return LC_MESSAGES],
4115 ac_cv_val_LC_MESSAGES=yes, ac_cv_val_LC_MESSAGES=no)])
4116 if test $ac_cv_val_LC_MESSAGES = yes; then
4117 AC_DEFINE(HAVE_LC_MESSAGES, 1,
4118 [Define if LC_MESSAGES is available in <locale.h>.])
4124 dnl Check whether rdrand is supported in the assembler.
4125 AC_DEFUN([GLIBCXX_CHECK_X86_RDRAND], [
4126 AC_CACHE_CHECK([for rdrand support in assembler],
4132 AC_TRY_COMPILE(, [asm("rdrand %eax");],
4133 [ac_cv_x86_rdrand=yes], [ac_cv_x86_rdrand=no])
4136 if test $ac_cv_x86_rdrand = yes; then
4137 AC_DEFINE(_GLIBCXX_X86_RDRAND, 1,
4138 [ Defined if as can handle rdrand. ])
4143 dnl Check whether rdseed is supported in the assembler.
4144 AC_DEFUN([GLIBCXX_CHECK_X86_RDSEED], [
4145 AC_CACHE_CHECK([for rdseed support in assembler],
4151 AC_TRY_COMPILE(, [asm("rdseed %eax");],
4152 [ac_cv_x86_rdseed=yes], [ac_cv_x86_rdseed=no])
4155 if test $ac_cv_x86_rdseed = yes; then
4156 AC_DEFINE(_GLIBCXX_X86_RDSEED, 1,
4157 [ Defined if as can handle rdseed. ])
4162 dnl Check whether get_nprocs is available in <sys/sysinfo.h>, and define _GLIBCXX_USE_GET_NPROCS.
4164 AC_DEFUN([GLIBCXX_CHECK_GET_NPROCS], [
4168 ac_save_CXXFLAGS="$CXXFLAGS"
4169 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4171 AC_CACHE_CHECK([for get_nprocs],
4172 glibcxx_cv_GET_NPROCS, [
4173 GCC_TRY_COMPILE_OR_LINK(
4174 [#include <sys/sysinfo.h>],
4175 [int n = get_nprocs();],
4176 [glibcxx_cv_GET_NPROCS=yes],
4177 [glibcxx_cv_GET_NPROCS=no])
4179 if test $glibcxx_cv_GET_NPROCS = yes; then
4180 AC_DEFINE(_GLIBCXX_USE_GET_NPROCS, 1, [Define if get_nprocs is available in <sys/sysinfo.h>.])
4183 CXXFLAGS="$ac_save_CXXFLAGS"
4188 dnl Check whether sysconf(_SC_NPROCESSORS_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROCESSORS_ONLN.
4190 AC_DEFUN([GLIBCXX_CHECK_SC_NPROCESSORS_ONLN], [
4194 ac_save_CXXFLAGS="$CXXFLAGS"
4195 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4197 AC_CACHE_CHECK([for _SC_NPROCESSORS_ONLN],
4198 glibcxx_cv_SC_NPROCESSORS_ONLN, [
4199 GCC_TRY_COMPILE_OR_LINK(
4200 [#include <unistd.h>],
4201 [int n = sysconf(_SC_NPROCESSORS_ONLN);],
4202 [glibcxx_cv_SC_NPROCESSORS_ONLN=yes],
4203 [glibcxx_cv_SC_NPROCESSORS_ONLN=no])
4205 if test $glibcxx_cv_SC_NPROCESSORS_ONLN = yes; then
4206 AC_DEFINE(_GLIBCXX_USE_SC_NPROCESSORS_ONLN, 1, [Define if _SC_NPROCESSORS_ONLN is available in <unistd.h>.])
4209 CXXFLAGS="$ac_save_CXXFLAGS"
4214 dnl Check whether sysconf(_SC_NPROC_ONLN) is available in <unistd.h>, and define _GLIBCXX_USE_SC_NPROC_ONLN.
4216 AC_DEFUN([GLIBCXX_CHECK_SC_NPROC_ONLN], [
4220 ac_save_CXXFLAGS="$CXXFLAGS"
4221 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4223 AC_CACHE_CHECK([for _SC_NPROC_ONLN],
4224 glibcxx_cv_SC_NPROC_ONLN, [
4225 GCC_TRY_COMPILE_OR_LINK(
4226 [#include <unistd.h>],
4227 [int n = sysconf(_SC_NPROC_ONLN);],
4228 [glibcxx_cv_SC_NPROC_ONLN=yes],
4229 [glibcxx_cv_SC_NPROC_ONLN=no])
4231 if test $glibcxx_cv_SC_NPROC_ONLN = yes; then
4232 AC_DEFINE(_GLIBCXX_USE_SC_NPROC_ONLN, 1, [Define if _SC_NPROC_ONLN is available in <unistd.h>.])
4235 CXXFLAGS="$ac_save_CXXFLAGS"
4240 dnl Check whether pthread_num_processors_np is available in <pthread.h>, and define _GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP.
4242 AC_DEFUN([GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP], [
4246 ac_save_CXXFLAGS="$CXXFLAGS"
4247 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4249 AC_CACHE_CHECK([for pthreads_num_processors_np],
4250 glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP, [
4251 GCC_TRY_COMPILE_OR_LINK(
4252 [#include <pthread.h>],
4253 [int n = pthread_num_processors_np();],
4254 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=yes],
4255 [glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP=no])
4257 if test $glibcxx_cv_PTHREADS_NUM_PROCESSORS_NP = yes; then
4258 AC_DEFINE(_GLIBCXX_USE_PTHREADS_NUM_PROCESSORS_NP, 1, [Define if pthreads_num_processors_np is available in <pthread.h>.])
4261 CXXFLAGS="$ac_save_CXXFLAGS"
4266 dnl Check whether pthread_cond_clockwait is available in <pthread.h> for std::condition_variable to use,
4267 dnl and define _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT.
4269 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_COND_CLOCKWAIT], [
4273 ac_save_CXXFLAGS="$CXXFLAGS"
4274 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4275 ac_save_LIBS="$LIBS"
4276 LIBS="$LIBS -lpthread"
4278 AC_CACHE_CHECK([for pthread_cond_clockwait],
4279 glibcxx_cv_PTHREAD_COND_CLOCKWAIT, [
4280 GCC_TRY_COMPILE_OR_LINK(
4281 [#include <pthread.h>],
4282 [pthread_mutex_t mutex; pthread_cond_t cond; struct timespec ts; int n = pthread_cond_clockwait(&cond, &mutex, 0, &ts);],
4283 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=yes],
4284 [glibcxx_cv_PTHREAD_COND_CLOCKWAIT=no])
4286 if test $glibcxx_cv_PTHREAD_COND_CLOCKWAIT = yes; then
4287 AC_DEFINE(_GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT, 1, [Define if pthread_cond_clockwait is available in <pthread.h>.])
4290 CXXFLAGS="$ac_save_CXXFLAGS"
4291 LIBS="$ac_save_LIBS"
4296 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4297 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4299 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_MUTEX_CLOCKLOCK], [
4303 ac_save_CXXFLAGS="$CXXFLAGS"
4304 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4305 ac_save_LIBS="$LIBS"
4306 LIBS="$LIBS -lpthread"
4308 AC_CACHE_CHECK([for pthread_mutex_clocklock],
4309 glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK, [
4310 GCC_TRY_COMPILE_OR_LINK(
4311 [#include <pthread.h>],
4312 [pthread_mutex_t mutex; struct timespec ts; int n = pthread_mutex_clocklock(&mutex, CLOCK_REALTIME, &ts);],
4313 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=yes],
4314 [glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK=no])
4316 if test $glibcxx_cv_PTHREAD_MUTEX_CLOCKLOCK = yes; then
4317 AC_DEFINE(_GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK, 1, [Define if pthread_mutex_clocklock is available in <pthread.h>.])
4320 CXXFLAGS="$ac_save_CXXFLAGS"
4321 LIBS="$ac_save_LIBS"
4326 dnl Check whether pthread_mutex_clocklock is available in <pthread.h> for std::timed_mutex to use,
4327 dnl and define _GLIBCXX_USE_PTHREAD_MUTEX_CLOCKLOCK.
4329 AC_DEFUN([GLIBCXX_CHECK_PTHREAD_RWLOCK_CLOCKLOCK], [
4333 ac_save_CXXFLAGS="$CXXFLAGS"
4334 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4335 ac_save_LIBS="$LIBS"
4336 LIBS="$LIBS -lpthread"
4338 AC_CACHE_CHECK([for pthread_rwlock_clockrdlock, pthread_wlock_clockwrlock],
4339 glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK, [
4340 GCC_TRY_COMPILE_OR_LINK(
4341 [#include <pthread.h>],
4342 [pthread_rwlock_t rwl; struct timespec ts;]
4343 [int n = pthread_rwlock_clockrdlock(&rwl, CLOCK_REALTIME, &ts);]
4344 [int m = pthread_rwlock_clockwrlock(&rwl, CLOCK_REALTIME, &ts);],
4345 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=yes],
4346 [glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK=no])
4348 if test $glibcxx_cv_PTHREAD_RWLOCK_CLOCKLOCK = yes; then
4349 AC_DEFINE(_GLIBCXX_USE_PTHREAD_RWLOCK_CLOCKLOCK, 1, [Define if pthread_rwlock_clockrdlock and pthread_rwlock_clockwrlock are available in <pthread.h>.])
4352 CXXFLAGS="$ac_save_CXXFLAGS"
4353 LIBS="$ac_save_LIBS"
4358 dnl Check whether sysctl is available in <pthread.h>, and define _GLIBCXX_USE_SYSCTL_HW_NCPU.
4360 AC_DEFUN([GLIBCXX_CHECK_SYSCTL_HW_NCPU], [
4364 ac_save_CXXFLAGS="$CXXFLAGS"
4365 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4367 AC_CACHE_CHECK([for hw.ncpu sysctl],
4368 glibcxx_cv_SYSCTL_HW_NCPU, [
4369 GCC_TRY_COMPILE_OR_LINK(
4372 #include <sys/sysctl.h>
4376 size_t size = sizeof(count);
4377 int mib[] = { CTL_HW, HW_NCPU };
4378 sysctl(mib, 2, &count, &size, NULL, 0);
4380 [glibcxx_cv_SYSCTL_HW_NCPU=yes],
4381 [glibcxx_cv_SYSCTL_HW_NCPU=no])
4383 if test $glibcxx_cv_SYSCTL_HW_NCPU = yes; then
4384 AC_DEFINE(_GLIBCXX_USE_SYSCTL_HW_NCPU, 1, [Define if sysctl(), CTL_HW and HW_NCPU are available in <sys/sysctl.h>.])
4387 CXXFLAGS="$ac_save_CXXFLAGS"
4392 dnl Check to see if python pretty printing can be activated.
4394 dnl --with-python-dir=dir
4395 dnl installs directory into $prefix/dir
4396 AC_DEFUN([GLIBCXX_ENABLE_PYTHON], [
4398 AC_MSG_CHECKING([for custom python install directory])
4399 AC_ARG_WITH([python-dir],
4400 AS_HELP_STRING([--with-python-dir],
4401 [the location to install Python modules. This path is relative starting from the prefix.]),
4402 [with_python_dir=$withval], [with_python_dir="no"])
4403 AC_MSG_RESULT(${with_python_dir})
4405 # Needed for installing Python modules during make install.
4406 python_mod_dir="${with_python_dir}"
4407 AC_SUBST(python_mod_dir)
4408 GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
4412 dnl Check to see if -Werror is disabled.
4414 dnl --enable-werror/--disable-werror
4415 AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
4416 AC_MSG_CHECKING([for -Werror])
4417 GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
4418 AC_MSG_RESULT($enable_werror)
4419 GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
4423 dnl Check whether obsolescent tmpnam is available in <stdio.h>,
4424 dnl and define _GLIBCXX_USE_TMPNAM.
4426 AC_DEFUN([GLIBCXX_CHECK_TMPNAM], [dnl
4430 ac_save_CXXFLAGS="$CXXFLAGS"
4431 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4433 AC_CACHE_CHECK([for tmpnam], glibcxx_cv_TMPNAM, [dnl
4434 GCC_TRY_COMPILE_OR_LINK(
4435 [#include <stdio.h>],
4436 [char *tmp = tmpnam(NULL);],
4437 [glibcxx_cv_TMPNAM=yes],
4438 [glibcxx_cv_TMPNAM=no])
4440 if test $glibcxx_cv_TMPNAM = yes; then
4441 AC_DEFINE(_GLIBCXX_USE_TMPNAM, 1, [Define if obsolescent tmpnam is available in <stdio.h>.])
4444 CXXFLAGS="$ac_save_CXXFLAGS"
4449 dnl Check to see if sys/sdt.h exists and that it is suitable for use.
4450 dnl Some versions of sdt.h were not compatible with C++11.
4452 AC_DEFUN([GLIBCXX_CHECK_SDT_H], [
4453 # Note that this test has to be run with the C language.
4454 # Otherwise, sdt.h will try to include some headers from
4458 AC_CACHE_CHECK([for suitable sys/sdt.h],
4459 glibcxx_cv_sys_sdt_h, [
4460 # Because we have to run the test in C, we use grep rather
4461 # than the compiler to check for the bug. The bug is that
4462 # were strings without trailing whitespace, causing g++
4463 # to look for operator"". The pattern searches for the fixed
4465 AC_EGREP_CPP([ \",\" ], [
4466 #include <sys/sdt.h>
4467 int f() { STAP_PROBE(hi, bob); }
4468 ], [glibcxx_cv_sys_sdt_h=yes], [glibcxx_cv_sys_sdt_h=no])
4471 if test $glibcxx_cv_sys_sdt_h = yes; then
4472 AC_DEFINE(HAVE_SYS_SDT_H, 1,
4473 [Define to 1 if you have a suitable <sys/sdt.h> header file])
4478 dnl Control whether the library should define symbols for old and new ABIs.
4479 dnl This affects definitions of strings, stringstreams and locale facets.
4481 dnl --disable-libstdcxx-dual-abi will use old ABI for all types.
4484 dnl _GLIBCXX_USE_DUAL_ABI (always defined, either to 1 or 0)
4486 AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_DUAL_ABI], [
4487 GLIBCXX_ENABLE(libstdcxx-dual-abi,$1,,[support two versions of std::string])
4488 if test x$enable_symvers = xgnu-versioned-namespace; then
4489 # gnu-versioned-namespace is incompatible with the dual ABI.
4490 enable_libstdcxx_dual_abi="no"
4492 if test x"$enable_libstdcxx_dual_abi" != xyes; then
4493 AC_MSG_NOTICE([dual ABI is disabled])
4494 default_libstdcxx_abi="gcc4-compatible"
4496 GLIBCXX_CONDITIONAL(ENABLE_DUAL_ABI, test $enable_libstdcxx_dual_abi = yes)
4500 dnl Check to see which ABI should be enabled by default.
4502 dnl --with-default-libstdcxx-abi={gcc4-compatible,new}
4505 dnl _GLIBCXX_USE_CXX11_ABI (always defined, either to 1 or 0)
4507 AC_DEFUN([GLIBCXX_DEFAULT_ABI], [
4508 if test x$enable_libstdcxx_dual_abi = xyes; then
4509 AC_MSG_CHECKING([for default std::string ABI to use])
4510 AC_ARG_WITH([default-libstdcxx-abi],
4511 AS_HELP_STRING([--with-default-libstdcxx-abi],
4512 [set the std::string ABI to use by default]),
4514 gcc4-compatible) default_libstdcxx_abi="gcc4-compatible" ;;
4515 new|cxx11) default_libstdcxx_abi="new" ;;
4516 c++*|gnu++*) AC_MSG_ERROR([Supported arguments for --with-default-libstdcxx-abi have changed, use "new" or "gcc4-compatible"]) ;;
4517 *) AC_MSG_ERROR([Invalid argument for --with-default-libstdcxx-abi]) ;;
4520 [default_libstdcxx_abi="new"])
4521 AC_MSG_RESULT(${default_libstdcxx_abi})
4523 if test $default_libstdcxx_abi = "new"; then
4530 AC_SUBST(glibcxx_cxx98_abi)
4531 GLIBCXX_CONDITIONAL(ENABLE_CXX11_ABI, test $glibcxx_cxx11_abi = 1)
4535 dnl Check to see whether to build libstdc++fs.a
4537 dnl --enable-libstdcxx-filesystem-ts
4539 AC_DEFUN([GLIBCXX_ENABLE_FILESYSTEM_TS], [
4540 GLIBCXX_ENABLE(libstdcxx-filesystem-ts,auto,,
4541 [turns on ISO/IEC TS 18822 support],
4542 [permit yes|no|auto])
4544 AC_MSG_CHECKING([whether to build Filesystem TS support])
4545 if test x"$ac_cv_header_dirent_h" != x"yes"; then
4546 enable_libstdcxx_filesystem_ts=no
4548 if test x"$enable_libstdcxx_filesystem_ts" = x"auto"; then
4549 case "${target_os}" in
4550 freebsd*|netbsd*|openbsd*|dragonfly*|darwin*)
4551 enable_libstdcxx_filesystem_ts=yes
4553 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu | uclinux*)
4554 enable_libstdcxx_filesystem_ts=yes
4557 enable_libstdcxx_filesystem_ts=yes
4560 enable_libstdcxx_filesystem_ts=yes
4563 enable_libstdcxx_filesystem_ts=yes
4566 enable_libstdcxx_filesystem_ts=no
4570 AC_MSG_RESULT($enable_libstdcxx_filesystem_ts)
4571 GLIBCXX_CONDITIONAL(ENABLE_FILESYSTEM_TS, test $enable_libstdcxx_filesystem_ts = yes)
4575 dnl Check whether the library calls required by the C++17 Filesystem library
4576 dnl and the Filesystem TS are present.
4578 dnl HAVE_STRUCT_DIRENT_D_TYPE
4579 dnl _GLIBCXX_USE_REALPATH
4580 dnl _GLIBCXX_USE_UTIMENSAT
4581 dnl _GLIBCXX_USE_ST_MTIM
4582 dnl _GLIBCXX_USE_FCHMOD
4583 dnl _GLIBCXX_USE_FCHMODAT
4584 dnl _GLIBCXX_USE_SENDFILE
4589 AC_DEFUN([GLIBCXX_CHECK_FILESYSTEM_DEPS], [dnl
4593 ac_save_CXXFLAGS="$CXXFLAGS"
4594 CXXFLAGS="$CXXFLAGS -fno-exceptions"
4596 AC_CACHE_CHECK([for struct dirent.d_type], glibcxx_cv_dirent_d_type, [dnl
4597 GCC_TRY_COMPILE_OR_LINK(
4598 [#include <dirent.h>],
4601 if (sizeof d.d_type) return 0;
4603 [glibcxx_cv_dirent_d_type=yes],
4604 [glibcxx_cv_dirent_d_type=no])
4606 if test $glibcxx_cv_dirent_d_type = yes; then
4607 AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE, 1, [Define to 1 if `d_type' is a member of `struct dirent'.])
4610 AC_CACHE_CHECK([for realpath], glibcxx_cv_realpath, [dnl
4611 GCC_TRY_COMPILE_OR_LINK(
4618 #if _XOPEN_VERSION < 500
4620 #elif _XOPEN_VERSION >= 700 || defined(PATH_MAX)
4621 char *tmp = realpath((const char*)NULL, (char*)NULL);
4626 [glibcxx_cv_realpath=yes],
4627 [glibcxx_cv_realpath=no])
4629 if test $glibcxx_cv_realpath = yes; then
4630 AC_DEFINE(_GLIBCXX_USE_REALPATH, 1, [Define if usable realpath is available in <stdlib.h>.])
4633 AC_CACHE_CHECK([for utimensat], glibcxx_cv_utimensat, [dnl
4634 GCC_TRY_COMPILE_OR_LINK(
4637 #include <sys/stat.h>
4640 struct timespec ts[2] = { { 0, UTIME_OMIT }, { 1, 1 } };
4641 int i = utimensat(AT_FDCWD, "path", ts, 0);
4643 [glibcxx_cv_utimensat=yes],
4644 [glibcxx_cv_utimensat=no])
4646 if test $glibcxx_cv_utimensat = yes; then
4647 AC_DEFINE(_GLIBCXX_USE_UTIMENSAT, 1, [Define if utimensat and UTIME_OMIT are available in <sys/stat.h> and AT_FDCWD in <fcntl.h>.])
4650 AC_CACHE_CHECK([for utime], glibcxx_cv_utime, [dnl
4651 GCC_TRY_COMPILE_OR_LINK(
4656 struct utimbuf t = { 1, 1 };
4657 int i = utime("path", &t);
4659 [glibcxx_cv_utime=yes],
4660 [glibcxx_cv_utime=no])
4662 if test $glibcxx_cv_utime = yes; then
4663 AC_DEFINE(_GLIBCXX_USE_UTIME, 1, [Define if utime is available in <utime.h>.])
4666 AC_CACHE_CHECK([for lstat], glibcxx_cv_lstat, [dnl
4667 GCC_TRY_COMPILE_OR_LINK(
4668 [ #include <sys/stat.h> ],
4671 int i = lstat("path", &st);
4673 [glibcxx_cv_lstat=yes],
4674 [glibcxx_cv_lstat=no])
4676 if test $glibcxx_cv_lstat = yes; then
4677 AC_DEFINE(_GLIBCXX_USE_LSTAT, 1, [Define if lstat is available in <sys/stat.h>.])
4680 AC_CACHE_CHECK([for struct stat.st_mtim.tv_nsec],
4681 glibcxx_cv_st_mtim, [dnl
4682 GCC_TRY_COMPILE_OR_LINK(
4683 [ #include <sys/stat.h> ],
4686 return st.st_mtim.tv_nsec;
4688 [glibcxx_cv_st_mtim=yes],
4689 [glibcxx_cv_st_mtim=no])
4691 if test $glibcxx_cv_st_mtim = yes; then
4692 AC_DEFINE(_GLIBCXX_USE_ST_MTIM, 1, [Define if struct stat has timespec members.])
4695 AC_CACHE_CHECK([for fchmod],
4696 glibcxx_cv_fchmod, [dnl
4697 GCC_TRY_COMPILE_OR_LINK(
4698 [#include <sys/stat.h>],
4699 [fchmod(1, S_IWUSR);],
4700 [glibcxx_cv_fchmod=yes],
4701 [glibcxx_cv_fchmod=no])
4703 if test $glibcxx_cv_fchmod = yes; then
4704 AC_DEFINE(_GLIBCXX_USE_FCHMOD, 1, [Define if fchmod is available in <sys/stat.h>.])
4707 AC_CACHE_CHECK([for fchmodat],
4708 glibcxx_cv_fchmodat, [dnl
4709 GCC_TRY_COMPILE_OR_LINK(
4712 #include <sys/stat.h>
4714 [fchmodat(AT_FDCWD, "", 0, AT_SYMLINK_NOFOLLOW);],
4715 [glibcxx_cv_fchmodat=yes],
4716 [glibcxx_cv_fchmodat=no])
4718 if test $glibcxx_cv_fchmodat = yes; then
4719 AC_DEFINE(_GLIBCXX_USE_FCHMODAT, 1, [Define if fchmodat is available in <sys/stat.h>.])
4722 AC_CACHE_CHECK([for sendfile that can copy files],
4723 glibcxx_cv_sendfile, [dnl
4724 case "${target_os}" in
4725 gnu* | linux* | solaris* | uclinux*)
4726 GCC_TRY_COMPILE_OR_LINK(
4727 [#include <sys/sendfile.h>],
4728 [sendfile(1, 2, (off_t*)0, sizeof 1);],
4729 [glibcxx_cv_sendfile=yes],
4730 [glibcxx_cv_sendfile=no])
4733 glibcxx_cv_sendfile=no
4737 if test $glibcxx_cv_sendfile = yes; then
4738 AC_DEFINE(_GLIBCXX_USE_SENDFILE, 1, [Define if sendfile is available in <sys/sendfile.h>.])
4741 AC_CACHE_CHECK([for link],
4742 glibcxx_cv_link, [dnl
4743 GCC_TRY_COMPILE_OR_LINK(
4744 [#include <unistd.h>],
4746 [glibcxx_cv_link=yes],
4747 [glibcxx_cv_link=no])
4749 if test $glibcxx_cv_link = yes; then
4750 AC_DEFINE(HAVE_LINK, 1, [Define if link is available in <unistd.h>.])
4753 AC_CACHE_CHECK([for readlink],
4754 glibcxx_cv_readlink, [dnl
4755 GCC_TRY_COMPILE_OR_LINK(
4756 [#include <unistd.h>],
4757 [char buf[32]; readlink("", buf, sizeof(buf));],
4758 [glibcxx_cv_readlink=yes],
4759 [glibcxx_cv_readlink=no])
4761 if test $glibcxx_cv_readlink = yes; then
4762 AC_DEFINE(HAVE_READLINK, 1, [Define if readlink is available in <unistd.h>.])
4765 AC_CACHE_CHECK([for symlink],
4766 glibcxx_cv_symlink, [dnl
4767 GCC_TRY_COMPILE_OR_LINK(
4768 [#include <unistd.h>],
4770 [glibcxx_cv_symlink=yes],
4771 [glibcxx_cv_symlink=no])
4773 if test $glibcxx_cv_symlink = yes; then
4774 AC_DEFINE(HAVE_SYMLINK, 1, [Define if symlink is available in <unistd.h>.])
4777 AC_CACHE_CHECK([for truncate],
4778 glibcxx_cv_truncate, [dnl
4779 GCC_TRY_COMPILE_OR_LINK(
4780 [#include <unistd.h>],
4781 [truncate("", 99);],
4782 [glibcxx_cv_truncate=yes],
4783 [glibcxx_cv_truncate=no])
4785 if test $glibcxx_cv_truncate = yes; then
4786 AC_DEFINE(HAVE_TRUNCATE, 1, [Define if truncate is available in <unistd.h>.])
4789 AC_CACHE_CHECK([for fdopendir],
4790 glibcxx_cv_fdopendir, [dnl
4791 GCC_TRY_COMPILE_OR_LINK(
4792 [#include <dirent.h>],
4793 [::DIR* dir = ::fdopendir(1);],
4794 [glibcxx_cv_fdopendir=yes],
4795 [glibcxx_cv_fdopendir=no])
4797 if test $glibcxx_cv_fdopendir = yes; then
4798 AC_DEFINE(HAVE_FDOPENDIR, 1, [Define if fdopendir is available in <dirent.h>.])
4801 AC_CACHE_CHECK([for dirfd],
4802 glibcxx_cv_dirfd, [dnl
4803 GCC_TRY_COMPILE_OR_LINK(
4804 [#include <dirent.h>],
4805 [int fd = ::dirfd((::DIR*)0);],
4806 [glibcxx_cv_dirfd=yes],
4807 [glibcxx_cv_dirfd=no])
4809 if test $glibcxx_cv_dirfd = yes; then
4810 AC_DEFINE(HAVE_DIRFD, 1, [Define if dirfd is available in <dirent.h>.])
4813 AC_CACHE_CHECK([for openat],
4814 glibcxx_cv_openat, [dnl
4815 GCC_TRY_COMPILE_OR_LINK(
4816 [#include <fcntl.h>],
4817 [int fd = ::openat(AT_FDCWD, "", 0);],
4818 [glibcxx_cv_openat=yes],
4819 [glibcxx_cv_openat=no])
4821 if test $glibcxx_cv_openat = yes; then
4822 AC_DEFINE(HAVE_OPENAT, 1, [Define if openat is available in <fcntl.h>.])
4825 AC_CACHE_CHECK([for unlinkat],
4826 glibcxx_cv_unlinkat, [dnl
4827 GCC_TRY_COMPILE_OR_LINK(
4829 #include <unistd.h>],
4830 [::unlinkat(AT_FDCWD, "", AT_REMOVEDIR);],
4831 [glibcxx_cv_unlinkat=yes],
4832 [glibcxx_cv_unlinkat=no])
4834 if test $glibcxx_cv_unlinkat = yes; then
4835 AC_DEFINE(HAVE_UNLINKAT, 1, [Define if unlinkat is available in <fcntl.h>.])
4838 CXXFLAGS="$ac_save_CXXFLAGS"
4843 dnl Check how size_t is mangled. Copied from libitm.
4845 AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
4846 AC_CACHE_CHECK([how size_t is mangled],
4847 glibcxx_cv_size_t_mangling, [
4848 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
4849 [glibcxx_cv_size_t_mangling=m], [
4850 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
4851 [glibcxx_cv_size_t_mangling=j], [
4853 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
4854 [glibcxx_cv_size_t_mangling=y], [
4856 [extern __SIZE_TYPE__ x; extern unsigned short x;],
4857 [glibcxx_cv_size_t_mangling=t], [
4859 [extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
4860 [glibcxx_cv_size_t_mangling=u6uint20],
4861 [glibcxx_cv_size_t_mangling=x])
4867 if test $glibcxx_cv_size_t_mangling = x; then
4868 AC_MSG_ERROR([Unknown underlying type for size_t])
4870 AC_DEFINE_UNQUOTED(_GLIBCXX_MANGLE_SIZE_T, [$glibcxx_cv_size_t_mangling],
4871 [Define to the letter to which size_t is mangled.])
4875 dnl Determine whether std::exception_ptr symbols should be exported with
4876 dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
4877 dnl release first added support for std::exception_ptr. Originally it was
4878 dnl only supported for targets with always-lock-free atomics for int, but
4879 dnl since GCC 7.1 it is supported for all targets.
4881 AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
4882 if test $enable_symvers != no; then
4883 AC_MSG_CHECKING([for first version to support std::exception_ptr])
4885 aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
4886 m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
4887 ac_exception_ptr_since_gcc46=yes
4890 # If the value of this macro changes then we will need to hardcode
4891 # yes/no here for additional targets based on the original value.
4892 AC_TRY_COMPILE([], [
4893 #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
4894 # error atomic int not always lock free
4897 [ac_exception_ptr_since_gcc46=yes],
4898 [ac_exception_ptr_since_gcc46=no])
4901 if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
4902 AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
4903 [Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
4904 AC_MSG_RESULT([4.6.0])
4906 AC_MSG_RESULT([7.1.0])
4912 dnl Check whether getentropy is present in <unistd.h>.
4914 AC_DEFUN([GLIBCXX_CHECK_GETENTROPY], [
4918 AC_CACHE_CHECK([for getentropy], glibcxx_cv_getentropy, [
4919 GCC_TRY_COMPILE_OR_LINK(
4920 [#include <unistd.h>],
4922 ::getentropy(&i, sizeof(i));],
4923 [glibcxx_cv_getentropy=yes], [glibcxx_cv_getentropy=no])
4926 if test $glibcxx_cv_getentropy = yes; then
4927 AC_DEFINE(HAVE_GETENTROPY, 1, [Define if getentropy is available in <unistd.h>.])
4933 dnl Check whether arc4random is present in <stdlib.h>.
4935 AC_DEFUN([GLIBCXX_CHECK_ARC4RANDOM], [
4939 AC_CACHE_CHECK([for arc4random], glibcxx_cv_arc4random, [
4940 GCC_TRY_COMPILE_OR_LINK(
4941 [#include <stdlib.h>],
4942 [unsigned i = ::arc4random();],
4943 [glibcxx_cv_arc4random=yes], [glibcxx_cv_arc4random=no])
4946 if test $glibcxx_cv_arc4random = yes; then
4947 AC_DEFINE(HAVE_ARC4RANDOM, 1, [Define if arc4random is available in <stdlib.h>.])
4953 dnl Check to see whether to build libstdc++_libbacktrace.a
4955 dnl --enable-libstdcxx-backtrace
4957 AC_DEFUN([GLIBCXX_ENABLE_BACKTRACE], [
4958 GLIBCXX_ENABLE(libstdcxx-backtrace,auto,,
4959 [turns on libbacktrace support],
4960 [permit yes|no|auto])
4962 # Most of this is adapted from libsanitizer/configure.ac
4966 # libbacktrace only needs atomics for int, which we've already tested
4967 if test "$glibcxx_cv_atomic_int" = "yes"; then
4968 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_ATOMIC_FUNCTIONS=1"
4971 # Test for __sync support.
4972 AC_CACHE_CHECK([__sync extensions],
4973 [glibcxx_cv_sys_sync],
4974 [GCC_TRY_COMPILE_OR_LINK(
4976 [__sync_bool_compare_and_swap (&i, i, i);
4977 __sync_lock_test_and_set (&i, 1);
4978 __sync_lock_release (&i);],
4979 [glibcxx_cv_sys_sync=yes],
4980 [glibcxx_cv_sys_sync=no])
4982 if test "$glibcxx_cv_sys_sync" = "yes"; then
4983 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_SYNC_FUNCTIONS=1"
4986 # Check for dl_iterate_phdr.
4987 AC_CHECK_HEADERS(link.h)
4988 if test "$ac_cv_header_link_h" = "no"; then
4989 have_dl_iterate_phdr=no
4991 # When built as a GCC target library, we can't do a link test.
4992 AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
4993 [have_dl_iterate_phdr=no])
4995 if test "$have_dl_iterate_phdr" = "yes"; then
4996 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_DL_ITERATE_PHDR=1"
4998 AC_CHECK_HEADERS(windows.h)
5000 # Check for the fcntl function.
5001 if test -n "${with_target_subdir}"; then
5003 *-*-mingw*) have_fcntl=no ;;
5004 *) have_fcntl=yes ;;
5007 AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
5009 if test "$have_fcntl" = "yes"; then
5010 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_FCNTL=1"
5013 AC_CHECK_DECLS(strnlen)
5015 # Check for getexecname function.
5016 if test -n "${with_target_subdir}"; then
5018 *-*-solaris2*) have_getexecname=yes ;;
5019 *) have_getexecname=no ;;
5022 AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no])
5024 if test "$have_getexecname" = "yes"; then
5025 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DHAVE_GETEXECNAME=1"
5028 # The library needs to be able to read the executable itself. Compile
5029 # a file to determine the executable format. The awk script
5030 # filetype.awk prints out the file type.
5031 AC_CACHE_CHECK([output filetype],
5032 [glibcxx_cv_sys_filetype],
5035 [AC_LANG_PROGRAM([int i;], [int j;])],
5036 [filetype=`${AWK} -f $srcdir/../libbacktrace/filetype.awk conftest.$ac_objext`],
5037 [AC_MSG_FAILURE([compiler failed])])
5038 glibcxx_cv_sys_filetype=$filetype])
5040 # Match the file type to decide what files to compile.
5042 case "$glibcxx_cv_sys_filetype" in
5043 elf*) FORMAT_FILE="elf.lo" ;;
5044 pecoff*) FORMAT_FILE="pecoff.lo" ;;
5045 *) AC_MSG_WARN([could not determine output file type])
5046 FORMAT_FILE="unknown.lo"
5047 enable_libstdcxx_backtrace=no
5050 AC_SUBST(FORMAT_FILE)
5054 case "$glibcxx_cv_sys_filetype" in
5055 elf32) elfsize=32 ;;
5056 elf64) elfsize=64 ;;
5058 BACKTRACE_CPPFLAGS="$BACKTRACE_CPPFLAGS -DBACKTRACE_ELF_SIZE=$elfsize"
5060 AC_MSG_CHECKING([whether to build libbacktrace support])
5061 if test "$enable_libstdcxx_backtrace" = "auto"; then
5062 enable_libstdcxx_backtrace=no
5064 AC_MSG_RESULT($enable_libstdcxx_backtrace)
5065 if test "$enable_libstdcxx_backtrace" = "yes"; then
5066 BACKTRACE_SUPPORTED=1
5068 AC_CHECK_HEADERS(sys/mman.h)
5070 *-*-msdosdjgpp) # DJGPP has sys/man.h, but no mmap
5073 have_mmap="$ac_cv_header_sys_mman_h" ;;
5076 if test "$have_mmap" = "no"; then
5081 AC_PREPROC_IFELSE([AC_LANG_SOURCE([
5082 #include <sys/mman.h>
5083 #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
5084 #error no MAP_ANONYMOUS
5086 ])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
5089 AC_SUBST(ALLOC_FILE)
5091 BACKTRACE_USES_MALLOC=0
5092 if test "$ALLOC_FILE" = "alloc.lo"; then
5093 BACKTRACE_USES_MALLOC=1
5096 if test "$ac_has_gthreads" = "yes"; then
5097 BACKTRACE_SUPPORTS_THREADS=1
5099 BACKTRACE_SUPPORTS_THREADS=0
5101 AC_SUBST(BACKTRACE_CPPFLAGS)
5102 AC_SUBST(BACKTRACE_SUPPORTED)
5103 AC_SUBST(BACKTRACE_USES_MALLOC)
5104 AC_SUBST(BACKTRACE_SUPPORTS_THREADS)
5105 AC_DEFINE(HAVE_STACKTRACE, 1, [Define if the <stacktrace> header is supported.])
5107 BACKTRACE_SUPPORTED=0
5108 BACKTRACE_USES_MALLOC=0
5109 BACKTRACE_SUPPORTS_THREADS=0
5111 GLIBCXX_CONDITIONAL(ENABLE_BACKTRACE, [test "$enable_libstdcxx_backtrace" = yes])
5115 dnl Allow the emergency EH pool to be configured.
5117 dnl --enable-libstdcxx-static-eh-pool will cause a fixed-size static buffer
5118 dnl to be used for allocating exceptions after malloc fails. The default is
5119 dnl to allocate a buffer using malloc
5121 dnl --with-libstdcxx-eh-pool-obj-count=N will set the default size for the
5122 dnl buffer. For a static buffer that size is fixed permanently. For a dynamic
5123 dnl buffer it's the default, but it can be overridden from the environment.
5125 dnl To set the default to approximately the same values as GCC 12,
5126 dnl use --with-libstdcxx-eh-pool-obj-count=94 for 32-bit targets,
5127 dnl and --with-libstdcxx-eh-pool-obj-count=252 for 64-bit targets.
5130 dnl _GLIBCXX_EH_POOL_STATIC if a fixed-size static buffer should be used
5131 dnl instead of allocating a buffer on startup.
5132 dnl _GLIBCXX_EH_POOL_NOBJS to override the default EMERGENCY_OBJ_COUNT value.
5134 AC_DEFUN([GLIBCXX_EMERGENCY_EH_ALLOC], [
5137 AC_ARG_ENABLE([libstdcxx-static-eh-pool],
5138 AC_HELP_STRING([--enable-libstdcxx-static-eh-pool],
5139 [use a fixed-size static buffer for allocating exceptions if malloc fails]),
5140 [if test "${enableval}" = yes; then
5141 eh_pool_static="-D_GLIBCXX_EH_POOL_STATIC"
5142 AC_MSG_NOTICE([EH pool using static buffer])
5145 AC_ARG_WITH([libstdcxx-eh-pool-obj-count],
5146 AC_HELP_STRING([--with-libstdcxx-eh-pool-obj-count],
5147 [the number of exceptions that can be allocated from the pool if malloc fails]),
5148 [if test "${withval}" -ge 0 2>/dev/null; then
5149 eh_pool_obj_count="-D_GLIBCXX_EH_POOL_NOBJS=${withval}"
5150 AC_MSG_NOTICE([EH pool object count: ${withval}])
5152 AC_MSG_ERROR([EH pool obj count must be a non-negative integer: $withval])
5155 EH_POOL_FLAGS="$eh_pool_static $eh_pool_obj_count"
5156 AC_SUBST(EH_POOL_FLAGS)
5160 dnl Allow the location of tzdata files to be configured.
5162 dnl --with-libstdcxx-zoneinfo=ARG where ARG can be:
5163 dnl DIR - use DIR/tzdata.zi and DIR/leapseconds files.
5164 dnl static - use static copy of tzdata.zi embedded in the library.
5165 dnl DIR,static - use DIR, but use embedded static copy as fallback.
5166 dnl yes - equivalent to DIR,static with a system-specific value for DIR.
5167 dnl no - disable most tzdb functionality.
5170 dnl _GLIBCXX_ZONEINFO_DIR if std::chrono::tzdb should use the specified
5171 dnl directory for the tzdata.zi and leapseconds files.
5172 dnl _GLIBCXX_STATIC_TZDATA if std::chrono::tzdb should use an embedded
5173 dnl static copy of the tzdata.zi file.
5175 AC_DEFUN([GLIBCXX_ZONEINFO_DIR], [
5176 AC_ARG_WITH([libstdcxx-zoneinfo],
5177 AC_HELP_STRING([--with-libstdcxx-zoneinfo],
5178 [the location to use for tzdata]),
5179 [],[with_libstdcxx_zoneinfo=yes])
5181 if test "x${with_libstdcxx_zoneinfo}" = xyes; then
5182 # Pick a default when no specific path is set.
5183 case "$target_os" in
5184 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
5185 # Not all distros ship tzdata.zi in this dir.
5186 zoneinfo_dir="/usr/share/zoneinfo"
5189 # Binary tzfile files are in /usr/share/lib/zoneinfo
5190 # but tzdata.zi is not present there.
5194 # Binary tzfile files are in /usr/share/lib/zoneinfo.default
5195 # but tzdata.zi is not present there.
5199 # Binary tzfile files are commonly found in /usr/share/zoneinfo
5200 # but tzdata.zi is not present there.
5205 avr-*-* | msp430-*-* ) embed_zoneinfo=no ;;
5207 # Also embed a copy of the tzdata.zi file as a static string.
5208 embed_zoneinfo=yes ;;
5210 elif test "x${with_libstdcxx_zoneinfo}" = xno; then
5211 # Disable tzdb support completely.
5215 case "${with_libstdcxx_zoneinfo}" in
5217 # Do not attempt to read from disk, always use embedded data.
5221 static,* | *,static)
5222 # Try to read from disk, use embedded data as fallback.
5223 zoneinfo_dir="${with_libstdcxx_zoneinfo#static,}"
5224 zoneinfo_dir="${with_libstdcxx_zoneinfo%,static}"
5228 zoneinfo_dir="${with_libstdcxx_zoneinfo}"
5233 AC_MSG_NOTICE([zoneinfo data directory: ${zoneinfo_dir}])
5234 if test "x${zoneinfo_dir}" != xnone; then
5235 AC_DEFINE_UNQUOTED(_GLIBCXX_ZONEINFO_DIR, "${zoneinfo_dir}",
5236 [Define if a directory should be searched for tzdata files.])
5237 if $GLIBCXX_IS_NATIVE && ! test -f "$zoneinfo_dir/tzdata.zi"; then
5238 AC_MSG_WARN("$zoneinfo_dir does not contain tzdata.zi file")
5241 GLIBCXX_CONDITIONAL(USE_STATIC_TZDATA, test "${embed_zoneinfo}" = yes)
5242 if test "x${embed_zoneinfo}" = xyes; then
5243 AC_MSG_NOTICE([static tzdata.zi file will be compiled into the library])
5244 AC_DEFINE_UNQUOTED(_GLIBCXX_STATIC_TZDATA, 1,
5245 [Define if static tzdata should be compiled into the library.])
5249 # Macros from the top-level gcc directory.
5250 m4_include([../config/gc++filt.m4])
5251 m4_include([../config/tls.m4])
5252 m4_include([../config/gthr.m4])
5253 m4_include([../config/cet.m4])