1 dnl ----------------------------------------------------------------------
2 dnl This whole bit snagged from libgfortran.
4 dnl Check whether the target supports __sync_*_compare_and_swap.
5 AC_DEFUN([LIBITM_CHECK_SYNC_BUILTINS], [
6 AC_CACHE_CHECK([whether the target supports __sync_*_compare_and_swap],
7 libitm_cv_have_sync_builtins, [
8 AC_TRY_LINK([], [int foo, bar; bar = __sync_val_compare_and_swap(&foo, 0, 1);],
9 libitm_cv_have_sync_builtins=yes, libitm_cv_have_sync_builtins=no)])
10 if test $libitm_cv_have_sync_builtins = yes; then
11 AC_DEFINE(HAVE_SYNC_BUILTINS, 1,
12 [Define to 1 if the target supports __sync_*_compare_and_swap])
15 dnl Check whether the target supports 64-bit __sync_*_compare_and_swap.
16 AC_DEFUN([LIBITM_CHECK_64BIT_SYNC_BUILTINS], [
17 AC_CACHE_CHECK([whether the target supports 64-bit __sync_*_compare_and_swap],
18 libitm_cv_have_64bit_sync_builtins, [
19 AC_TRY_LINK([#include <stdint.h>],
21 bar = __sync_val_compare_and_swap(&foo, 0, 1);],
22 libitm_cv_have_64bit_sync_builtins=yes,
23 libitm_cv_have_64bit_sync_builtins=no)])
24 if test $libitm_cv_have_64bit_sync_builtins = yes; then
25 AC_DEFINE(HAVE_64BIT_SYNC_BUILTINS, 1,
26 [Define to 1 if the target supports 64-bit __sync_*_compare_and_swap])
29 dnl Check whether the target supports hidden visibility.
30 AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_VISIBILITY], [
31 AC_CACHE_CHECK([whether the target supports hidden visibility],
32 libitm_cv_have_attribute_visibility, [
34 CFLAGS="$CFLAGS -Werror"
35 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
36 [], libitm_cv_have_attribute_visibility=yes,
37 libitm_cv_have_attribute_visibility=no)
38 CFLAGS="$save_CFLAGS"])
39 if test $libitm_cv_have_attribute_visibility = yes; then
40 AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
41 [Define to 1 if the target supports __attribute__((visibility(...))).])
44 dnl Check whether the target supports dllexport
45 AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_DLLEXPORT], [
46 AC_CACHE_CHECK([whether the target supports dllexport],
47 libitm_cv_have_attribute_dllexport, [
49 CFLAGS="$CFLAGS -Werror"
50 AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],
51 [], libitm_cv_have_attribute_dllexport=yes,
52 libitm_cv_have_attribute_dllexport=no)
53 CFLAGS="$save_CFLAGS"])
54 if test $libitm_cv_have_attribute_dllexport = yes; then
55 AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
56 [Define to 1 if the target supports __attribute__((dllexport)).])
59 dnl Check whether the target supports symbol aliases.
60 AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_ALIAS], [
61 AC_CACHE_CHECK([whether the target supports symbol aliases],
62 libitm_cv_have_attribute_alias, [
65 extern void bar(void) __attribute__((alias("foo")));],
66 [bar();], libitm_cv_have_attribute_alias=yes, libitm_cv_have_attribute_alias=no)])
67 if test $libitm_cv_have_attribute_alias = yes; then
68 AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
69 [Define to 1 if the target supports __attribute__((alias(...))).])
72 dnl Check how size_t is mangled.
73 AC_DEFUN([LIBITM_CHECK_SIZE_T_MANGLING], [
74 AC_CACHE_CHECK([how size_t is mangled],
75 libitm_cv_size_t_mangling, [
76 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
77 [libitm_cv_size_t_mangling=m], [
78 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
79 [libitm_cv_size_t_mangling=j], [
81 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
82 [libitm_cv_size_t_mangling=y], [
84 [extern __SIZE_TYPE__ x; extern unsigned short x;],
85 [libitm_cv_size_t_mangling=t],
86 [libitm_cv_size_t_mangling=x])
91 if test $libitm_cv_size_t_mangling = x; then
92 AC_MSG_ERROR([Unknown underlying type for size_t])
94 AC_DEFINE_UNQUOTED(MANGLE_SIZE_T, [$libitm_cv_size_t_mangling],
95 [Define to the letter to which size_t is mangled.])
98 dnl Check if as supports AVX instructions.
99 AC_DEFUN([LIBITM_CHECK_AS_AVX], [
100 case "${target_cpu}" in
101 i[[34567]]86 | x86_64)
102 AC_CACHE_CHECK([if the assembler supports AVX], libitm_cv_as_avx, [
103 AC_TRY_COMPILE([], [asm("vzeroupper");],
104 [libitm_cv_as_avx=yes], [libitm_cv_as_avx=no])
106 if test x$libitm_cv_as_avx = xyes; then
107 AC_DEFINE(HAVE_AS_AVX, 1, [Define to 1 if the assembler supports AVX.])
112 sinclude(../libtool.m4)
113 dnl The lines below arrange for aclocal not to bring an installed
114 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
115 dnl add a definition of LIBTOOL to Makefile.in.
116 ifelse(,,,[AC_SUBST(LIBTOOL)
117 AC_DEFUN([AM_PROG_LIBTOOL])
118 AC_DEFUN([AC_LIBTOOL_DLOPEN])
119 AC_DEFUN([AC_PROG_LD])
122 dnl ----------------------------------------------------------------------
123 dnl This whole bit snagged from libstdc++-v3.
127 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
128 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
129 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
131 dnl See docs/html/17_intro/configury.html#enable for documentation.
133 m4_define([LIBITM_ENABLE],[dnl
134 m4_define([_g_switch],[--enable-$1])dnl
135 m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
136 AC_ARG_ENABLE($1,_g_help,
141 m4_bpatsubst([$5],[permit ])) ;;
142 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
143 dnl Idea for future: generate a URL pointing to
144 dnl "onlinedocs/configopts.html#whatever"
151 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
155 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
156 m4_undefine([_g_switch])dnl
157 m4_undefine([_g_help])dnl
162 dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
163 dnl the native linker is in use, all variables will be defined to something
164 dnl safe (like an empty string).
167 dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
168 dnl OPT_LDFLAGS='-Wl,-O1' if possible
169 dnl LD (as a side effect of testing)
172 dnl libitm_ld_is_gold (possibly)
173 dnl libitm_gnu_ld_version (possibly)
175 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
176 dnl set libitm_gnu_ld_version to 12345. Zeros cause problems.
178 AC_DEFUN([LIBITM_CHECK_LINKER_FEATURES], [
179 # If we're not using GNU ld, then there's no point in even trying these
180 # tests. Check for that first. We should have already tested for gld
181 # by now (in libtool), but require it now just to be safe...
182 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
183 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
184 AC_REQUIRE([AC_PROG_LD])
185 AC_REQUIRE([AC_PROG_AWK])
187 # The name set by libtool depends on the version of libtool. Shame on us
188 # for depending on an impl detail, but c'est la vie. Older versions used
189 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
190 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
191 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
192 # set (hence we're using an older libtool), then set it.
193 if test x${with_gnu_ld+set} != xset; then
194 if test x${ac_cv_prog_gnu_ld+set} != xset; then
195 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
198 with_gnu_ld=$ac_cv_prog_gnu_ld
202 # Start by getting the version number. I think the libtool test already
203 # does some of this, but throws away the result.
205 if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
206 libitm_ld_is_gold=yes
209 ldver=`$LD --version 2>/dev/null |
210 sed -e 's/GNU gold /GNU ld /;s/GNU ld version /GNU ld /;s/GNU ld ([^)]*) /GNU ld /;s/GNU ld \([0-9.][0-9.]*\).*/\1/; q'`
212 libitm_gnu_ld_version=`echo $ldver | \
213 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
216 if test "$with_gnu_ld" = "notbroken"; then
217 # GNU ld it is! Joy and bunny rabbits!
219 # All these tests are for C++; save the language and the compiler flags.
220 # Need to do this so that g++ won't try to link in libstdc++
221 ac_test_CFLAGS="${CFLAGS+set}"
222 ac_save_CFLAGS="$CFLAGS"
223 CFLAGS='-x c++ -Wl,--gc-sections'
225 # Check for -Wl,--gc-sections
226 # XXX This test is broken at the moment, as symbols required for linking
227 # are now in libsupc++ (not built yet). In addition, this test has
228 # cored on solaris in the past. In addition, --gc-sections doesn't
229 # really work at the moment (keeps on discarding used sections, first
230 # .eh_frame and now some of the glibc sections for iconv).
231 # Bzzzzt. Thanks for playing, maybe next time.
232 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
240 ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
241 if test "$ac_test_CFLAGS" = set; then
242 CFLAGS="$ac_save_CFLAGS"
244 # this is the suspicious part
247 if test "$ac_sectionLDflags" = "yes"; then
248 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
250 AC_MSG_RESULT($ac_sectionLDflags)
253 # Set linker optimization flags.
254 if test x"$with_gnu_ld" = x"yes"; then
255 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
258 AC_SUBST(SECTION_LDFLAGS)
259 AC_SUBST(OPT_LDFLAGS)
264 dnl Add version tags to symbols in shared library (or not), additionally
265 dnl marking other symbols as private/local (or not).
267 dnl --enable-symvers=style adds a version script to the linker call when
268 dnl creating the shared library. The choice of version script is
269 dnl controlled by 'style'.
270 dnl --disable-symvers does not.
271 dnl + Usage: LIBITM_ENABLE_SYMVERS[(DEFAULT)]
272 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
273 dnl choose a default style based on linker characteristics. Passing
274 dnl 'no' disables versioning.
276 AC_DEFUN([LIBITM_ENABLE_SYMVERS], [
278 LIBITM_ENABLE(symvers,yes,[=STYLE],
279 [enables symbol versioning of the shared library],
280 [permit yes|no|gnu*|sun])
282 # If we never went through the LIBITM_CHECK_LINKER_FEATURES macro, then we
283 # don't know enough about $LD to do tricks...
284 AC_REQUIRE([LIBITM_CHECK_LINKER_FEATURES])
286 # Turn a 'yes' into a suitable default.
287 if test x$enable_symvers = xyes ; then
288 # FIXME The following test is too strict, in theory.
289 if test $enable_shared = no || test "x$LD" = x; then
292 if test $with_gnu_ld = yes ; then
296 # Sun symbol versioning exists since Solaris 2.5.
297 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
298 enable_symvers=sun ;;
306 # Check if 'sun' was requested on non-Solaris 2 platforms.
307 if test x$enable_symvers = xsun ; then
314 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
315 AC_MSG_WARN([=== you are not targetting Solaris 2.])
316 AC_MSG_WARN([=== Symbol versioning will be disabled.])
322 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
323 if test $enable_symvers != no; then
324 AC_MSG_CHECKING([for shared libgcc])
325 ac_save_CFLAGS="$CFLAGS"
327 AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes, libitm_shared_libgcc=no)
328 CFLAGS="$ac_save_CFLAGS"
329 if test $libitm_shared_libgcc = no; then
330 cat > conftest.c <<EOF
331 int main (void) { return 0; }
334 libitm_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
335 -shared -shared-libgcc -o conftest.so \
336 conftest.c -v 2>&1 >/dev/null \
337 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
339 rm -f conftest.c conftest.so
340 if test x${libitm_libgcc_s_suffix+set} = xset; then
341 CFLAGS=" -lgcc_s$libitm_libgcc_s_suffix"
342 AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes)
343 CFLAGS="$ac_save_CFLAGS"
346 AC_MSG_RESULT($libitm_shared_libgcc)
349 # For GNU ld, we need at least this version. The format is described in
350 # LIBITM_CHECK_LINKER_FEATURES above.
351 libitm_min_gnu_ld_version=21400
352 # XXXXXXXXXXX libitm_gnu_ld_version=21390
354 # Check to see if unspecified "yes" value can win, given results above.
355 # Change "yes" into either "no" or a style name.
356 if test $enable_symvers != no && test $libitm_shared_libgcc = yes; then
357 if test $with_gnu_ld = yes; then
358 if test $libitm_gnu_ld_version -ge $libitm_min_gnu_ld_version ; then
360 elif test $libitm_ld_is_gold = yes ; then
363 # The right tools, the right setup, but too old. Fallbacks?
364 AC_MSG_WARN(=== Linker version $libitm_gnu_ld_version is too old for)
365 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
366 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
367 AC_MSG_WARN(=== $libitm_min_gnu_ld_version or later and rebuild GCC.)
368 if test $libitm_gnu_ld_version -ge 21200 ; then
369 # Globbing fix is present, proper block support is not.
370 dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.])
371 dnl enable_symvers=???
372 AC_MSG_WARN([=== Symbol versioning will be disabled.])
376 AC_MSG_WARN([=== Symbol versioning will be disabled.])
380 elif test $enable_symvers = sun; then
381 : All interesting versions of Sun ld support sun style symbol versioning.
384 AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
385 AC_MSG_WARN([=== either you are not using a supported linker, or you are])
386 AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
387 AC_MSG_WARN([=== Symbol versioning will be disabled.])
392 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
393 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu)
394 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun)
395 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)