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 dnl Check if as supports RTM instructions.
113 AC_DEFUN([LIBITM_CHECK_AS_RTM], [
114 case "${target_cpu}" in
115 i[[34567]]86 | x86_64)
116 AC_CACHE_CHECK([if the assembler supports RTM], libitm_cv_as_rtm, [
117 AC_TRY_COMPILE([], [asm("1: xbegin 1b; xend");],
118 [libitm_cv_as_rtm=yes], [libitm_cv_as_rtm=no])
120 if test x$libitm_cv_as_rtm = xyes; then
121 AC_DEFINE(HAVE_AS_RTM, 1, [Define to 1 if the assembler supports RTM.])
126 dnl Check if as supports HTM instructions.
127 AC_DEFUN([LIBITM_CHECK_AS_HTM], [
128 case "${target_cpu}" in
130 AC_CACHE_CHECK([if the assembler supports HTM], libitm_cv_as_htm, [
131 AC_TRY_COMPILE([], [asm("tbegin. 0; tend. 0");],
132 [libitm_cv_as_htm=yes], [libitm_cv_as_htm=no])
134 if test x$libitm_cv_as_htm = xyes; then
135 AC_DEFINE(HAVE_AS_HTM, 1, [Define to 1 if the assembler supports HTM.])
139 AC_CACHE_CHECK([if the assembler supports HTM], libitm_cv_as_htm, [
140 save_CFLAGS="$CFLAGS"
141 CFLAGS="$CFLAGS -march=zEC12"
142 AC_TRY_COMPILE([], [asm("tbegin 0,0; tend");],
143 [libitm_cv_as_htm=yes], [libitm_cv_as_htm=no])
144 CFLAGS="$save_CFLAGS"])
145 if test x$libitm_cv_as_htm = xyes; then
146 AC_DEFINE(HAVE_AS_HTM, 1, [Define to 1 if the assembler supports HTM.])
151 sinclude(../libtool.m4)
152 sinclude(../config/cet.m4)
153 dnl The lines below arrange for aclocal not to bring an installed
154 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
155 dnl add a definition of LIBTOOL to Makefile.in.
156 ifelse(,,,[AC_SUBST(LIBTOOL)
157 AC_DEFUN([AM_PROG_LIBTOOL])
158 AC_DEFUN([AC_LIBTOOL_DLOPEN])
159 AC_DEFUN([AC_PROG_LD])
162 dnl ----------------------------------------------------------------------
163 dnl This whole bit snagged from libstdc++-v3.
167 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
168 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
169 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
171 dnl See docs/html/17_intro/configury.html#enable for documentation.
173 m4_define([LIBITM_ENABLE],[dnl
174 m4_define([_g_switch],[--enable-$1])dnl
175 m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
176 AC_ARG_ENABLE($1,_g_help,
181 m4_bpatsubst([$5],[permit ])) ;;
182 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
183 dnl Idea for future: generate a URL pointing to
184 dnl "onlinedocs/configopts.html#whatever"
191 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
195 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
196 m4_undefine([_g_switch])dnl
197 m4_undefine([_g_help])dnl
202 dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
203 dnl the native linker is in use, all variables will be defined to something
204 dnl safe (like an empty string).
207 dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
208 dnl OPT_LDFLAGS='-Wl,-O1' if possible
209 dnl LD (as a side effect of testing)
212 dnl libitm_ld_is_gold (possibly)
213 dnl libitm_ld_is_mold (possibly)
214 dnl libitm_gnu_ld_version (possibly)
216 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
217 dnl set libitm_gnu_ld_version to 12345. Zeros cause problems.
219 AC_DEFUN([LIBITM_CHECK_LINKER_FEATURES], [
220 # If we're not using GNU ld, then there's no point in even trying these
221 # tests. Check for that first. We should have already tested for gld
222 # by now (in libtool), but require it now just to be safe...
223 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
224 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
225 AC_REQUIRE([AC_PROG_LD])
226 AC_REQUIRE([AC_PROG_AWK])
228 # The name set by libtool depends on the version of libtool. Shame on us
229 # for depending on an impl detail, but c'est la vie. Older versions used
230 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
231 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
232 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
233 # set (hence we're using an older libtool), then set it.
234 if test x${with_gnu_ld+set} != xset; then
235 if test x${ac_cv_prog_gnu_ld+set} != xset; then
236 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
239 with_gnu_ld=$ac_cv_prog_gnu_ld
243 # Start by getting the version number. I think the libtool test already
244 # does some of this, but throws away the result.
247 if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
248 libitm_ld_is_gold=yes
249 elif $LD --version 2>/dev/null | grep 'mold' >/dev/null 2>&1; then
250 libitm_ld_is_mold=yes
253 ldver=`$LD --version 2>/dev/null |
254 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
256 libitm_gnu_ld_version=`echo $ldver | \
257 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
260 if test "$with_gnu_ld" = "notbroken"; then
261 # GNU ld it is! Joy and bunny rabbits!
263 # All these tests are for C++; save the language and the compiler flags.
264 # Need to do this so that g++ won't try to link in libstdc++
265 ac_test_CFLAGS="${CFLAGS+set}"
266 ac_save_CFLAGS="$CFLAGS"
267 CFLAGS='-x c++ -Wl,--gc-sections'
269 # Check for -Wl,--gc-sections
270 # XXX This test is broken at the moment, as symbols required for linking
271 # are now in libsupc++ (not built yet). In addition, this test has
272 # cored on solaris in the past. In addition, --gc-sections doesn't
273 # really work at the moment (keeps on discarding used sections, first
274 # .eh_frame and now some of the glibc sections for iconv).
275 # Bzzzzt. Thanks for playing, maybe next time.
276 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
284 ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
285 if test "$ac_test_CFLAGS" = set; then
286 CFLAGS="$ac_save_CFLAGS"
288 # this is the suspicious part
291 if test "$ac_sectionLDflags" = "yes"; then
292 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
294 AC_MSG_RESULT($ac_sectionLDflags)
297 # Set linker optimization flags.
298 if test x"$with_gnu_ld" = x"yes"; then
299 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
302 AC_SUBST(SECTION_LDFLAGS)
303 AC_SUBST(OPT_LDFLAGS)
308 dnl Add version tags to symbols in shared library (or not), additionally
309 dnl marking other symbols as private/local (or not).
311 dnl --enable-symvers=style adds a version script to the linker call when
312 dnl creating the shared library. The choice of version script is
313 dnl controlled by 'style'.
314 dnl --disable-symvers does not.
315 dnl + Usage: LIBITM_ENABLE_SYMVERS[(DEFAULT)]
316 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
317 dnl choose a default style based on linker characteristics. Passing
318 dnl 'no' disables versioning.
320 AC_DEFUN([LIBITM_ENABLE_SYMVERS], [
322 LIBITM_ENABLE(symvers,yes,[=STYLE],
323 [enables symbol versioning of the shared library],
324 [permit yes|no|gnu*|sun])
326 # If we never went through the LIBITM_CHECK_LINKER_FEATURES macro, then we
327 # don't know enough about $LD to do tricks...
328 AC_REQUIRE([LIBITM_CHECK_LINKER_FEATURES])
330 # Turn a 'yes' into a suitable default.
331 if test x$enable_symvers = xyes ; then
332 # FIXME The following test is too strict, in theory.
333 if test $enable_shared = no || test "x$LD" = x; then
336 if test $with_gnu_ld = yes ; then
340 # Sun symbol versioning exists since Solaris 2.5.
341 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
342 enable_symvers=sun ;;
350 # Check if 'sun' was requested on non-Solaris 2 platforms.
351 if test x$enable_symvers = xsun ; then
358 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
359 AC_MSG_WARN([=== you are not targetting Solaris 2.])
360 AC_MSG_WARN([=== Symbol versioning will be disabled.])
366 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
367 if test $enable_symvers != no; then
368 AC_MSG_CHECKING([for shared libgcc])
369 ac_save_CFLAGS="$CFLAGS"
371 AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes, libitm_shared_libgcc=no)
372 CFLAGS="$ac_save_CFLAGS"
373 if test $libitm_shared_libgcc = no; then
374 cat > conftest.c <<EOF
375 int main (void) { return 0; }
378 libitm_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
379 -shared -shared-libgcc -o conftest.so \
380 conftest.c -v 2>&1 >/dev/null \
381 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
383 rm -f conftest.c conftest.so
384 if test x${libitm_libgcc_s_suffix+set} = xset; then
385 CFLAGS=" -lgcc_s$libitm_libgcc_s_suffix"
386 AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes)
387 CFLAGS="$ac_save_CFLAGS"
390 AC_MSG_RESULT($libitm_shared_libgcc)
393 # For GNU ld, we need at least this version. The format is described in
394 # LIBITM_CHECK_LINKER_FEATURES above.
395 libitm_min_gnu_ld_version=21400
396 # XXXXXXXXXXX libitm_gnu_ld_version=21390
398 # Check to see if unspecified "yes" value can win, given results above.
399 # Change "yes" into either "no" or a style name.
400 if test $enable_symvers != no && test $libitm_shared_libgcc = yes; then
401 if test $with_gnu_ld = yes; then
402 if test $libitm_gnu_ld_version -ge $libitm_min_gnu_ld_version ; then
404 elif test $libitm_ld_is_gold = yes ; then
406 elif test $libitm_ld_is_mold = yes ; then
409 # The right tools, the right setup, but too old. Fallbacks?
410 AC_MSG_WARN(=== Linker version $libitm_gnu_ld_version is too old for)
411 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
412 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
413 AC_MSG_WARN(=== $libitm_min_gnu_ld_version or later and rebuild GCC.)
414 if test $libitm_gnu_ld_version -ge 21200 ; then
415 # Globbing fix is present, proper block support is not.
416 dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.])
417 dnl enable_symvers=???
418 AC_MSG_WARN([=== Symbol versioning will be disabled.])
422 AC_MSG_WARN([=== Symbol versioning will be disabled.])
426 elif test $enable_symvers = sun; then
427 : All interesting versions of Sun ld support sun style symbol versioning.
430 AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
431 AC_MSG_WARN([=== either you are not using a supported linker, or you are])
432 AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
433 AC_MSG_WARN([=== Symbol versioning will be disabled.])
438 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
439 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu)
440 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun)
441 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)