9ce91011bf
* clearcap.map: New file. * acinclude.m4 (LIBITM_CHECK_LINKER_HWCAP): New test. * configure.ac: Call it. Clear HWCAP_LDFLAGS if defaulting to -mavx. * Makefile.am (AM_LDFLAGS): Add $(HWCAP_LDFLAGS) * configure: Regenerate. * Makefile.in: Regenerate. * testsuite/Makefile.in: Regenerate. From-SVN: r183430
427 lines
15 KiB
Plaintext
427 lines
15 KiB
Plaintext
dnl ----------------------------------------------------------------------
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dnl This whole bit snagged from libgfortran.
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dnl Check whether the target supports __sync_*_compare_and_swap.
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AC_DEFUN([LIBITM_CHECK_SYNC_BUILTINS], [
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AC_CACHE_CHECK([whether the target supports __sync_*_compare_and_swap],
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libitm_cv_have_sync_builtins, [
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AC_TRY_LINK([], [int foo, bar; bar = __sync_val_compare_and_swap(&foo, 0, 1);],
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libitm_cv_have_sync_builtins=yes, libitm_cv_have_sync_builtins=no)])
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if test $libitm_cv_have_sync_builtins = yes; then
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AC_DEFINE(HAVE_SYNC_BUILTINS, 1,
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[Define to 1 if the target supports __sync_*_compare_and_swap])
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fi])
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dnl Check whether the target supports 64-bit __sync_*_compare_and_swap.
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AC_DEFUN([LIBITM_CHECK_64BIT_SYNC_BUILTINS], [
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AC_CACHE_CHECK([whether the target supports 64-bit __sync_*_compare_and_swap],
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libitm_cv_have_64bit_sync_builtins, [
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AC_TRY_LINK([#include <stdint.h>],
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[uint64_t foo, bar;
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bar = __sync_val_compare_and_swap(&foo, 0, 1);],
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libitm_cv_have_64bit_sync_builtins=yes,
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libitm_cv_have_64bit_sync_builtins=no)])
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if test $libitm_cv_have_64bit_sync_builtins = yes; then
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AC_DEFINE(HAVE_64BIT_SYNC_BUILTINS, 1,
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[Define to 1 if the target supports 64-bit __sync_*_compare_and_swap])
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fi])
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dnl Check whether the target supports hidden visibility.
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AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_VISIBILITY], [
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AC_CACHE_CHECK([whether the target supports hidden visibility],
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libitm_cv_have_attribute_visibility, [
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save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Werror"
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AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
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[], libitm_cv_have_attribute_visibility=yes,
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libitm_cv_have_attribute_visibility=no)
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CFLAGS="$save_CFLAGS"])
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if test $libitm_cv_have_attribute_visibility = yes; then
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AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
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[Define to 1 if the target supports __attribute__((visibility(...))).])
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fi])
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dnl Check whether the target supports dllexport
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AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_DLLEXPORT], [
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AC_CACHE_CHECK([whether the target supports dllexport],
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libitm_cv_have_attribute_dllexport, [
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save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Werror"
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AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],
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[], libitm_cv_have_attribute_dllexport=yes,
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libitm_cv_have_attribute_dllexport=no)
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CFLAGS="$save_CFLAGS"])
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if test $libitm_cv_have_attribute_dllexport = yes; then
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AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
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[Define to 1 if the target supports __attribute__((dllexport)).])
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fi])
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dnl Check whether the target supports symbol aliases.
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AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_ALIAS], [
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AC_CACHE_CHECK([whether the target supports symbol aliases],
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libitm_cv_have_attribute_alias, [
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AC_TRY_LINK([
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void foo(void) { }
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extern void bar(void) __attribute__((alias("foo")));],
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[bar();], libitm_cv_have_attribute_alias=yes, libitm_cv_have_attribute_alias=no)])
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if test $libitm_cv_have_attribute_alias = yes; then
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AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
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[Define to 1 if the target supports __attribute__((alias(...))).])
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fi])
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dnl Check how size_t is mangled.
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AC_DEFUN([LIBITM_CHECK_SIZE_T_MANGLING], [
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AC_CACHE_CHECK([how size_t is mangled],
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libitm_cv_size_t_mangling, [
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AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
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[libitm_cv_size_t_mangling=m], [
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AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
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[libitm_cv_size_t_mangling=j], [
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AC_TRY_COMPILE([],
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[extern __SIZE_TYPE__ x; extern unsigned long long x;],
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[libitm_cv_size_t_mangling=y], [
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AC_TRY_COMPILE([],
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[extern __SIZE_TYPE__ x; extern unsigned short x;],
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[libitm_cv_size_t_mangling=t],
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[libitm_cv_size_t_mangling=x])
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])
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])
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])
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])
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if test $libitm_cv_size_t_mangling = x; then
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AC_MSG_ERROR([Unknown underlying type for size_t])
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fi
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AC_DEFINE_UNQUOTED(MANGLE_SIZE_T, [$libitm_cv_size_t_mangling],
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[Define to the letter to which size_t is mangled.])
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])
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dnl Check if as supports AVX instructions.
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AC_DEFUN([LIBITM_CHECK_AS_AVX], [
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case "${target_cpu}" in
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i[[34567]]86 | x86_64)
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AC_CACHE_CHECK([if the assembler supports AVX], libitm_cv_as_avx, [
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AC_TRY_COMPILE([], [asm("vzeroupper");],
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[libitm_cv_as_avx=yes], [libitm_cv_as_avx=no])
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])
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if test x$libitm_cv_as_avx = xyes; then
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AC_DEFINE(HAVE_AS_AVX, 1, [Define to 1 if the assembler supports AVX.])
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fi
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;;
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esac])
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sinclude(../libtool.m4)
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dnl The lines below arrange for aclocal not to bring an installed
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dnl libtool.m4 into aclocal.m4, while still arranging for automake to
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dnl add a definition of LIBTOOL to Makefile.in.
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ifelse(,,,[AC_SUBST(LIBTOOL)
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AC_DEFUN([AM_PROG_LIBTOOL])
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AC_DEFUN([AC_LIBTOOL_DLOPEN])
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AC_DEFUN([AC_PROG_LD])
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])
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dnl ----------------------------------------------------------------------
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dnl This whole bit snagged from libstdc++-v3.
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dnl
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dnl LIBITM_ENABLE
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dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
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dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
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dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
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dnl
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dnl See docs/html/17_intro/configury.html#enable for documentation.
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dnl
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m4_define([LIBITM_ENABLE],[dnl
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m4_define([_g_switch],[--enable-$1])dnl
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m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
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AC_ARG_ENABLE($1,_g_help,
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m4_bmatch([$5],
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[^permit ],
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[[
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case "$enableval" in
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m4_bpatsubst([$5],[permit ])) ;;
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*) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
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dnl Idea for future: generate a URL pointing to
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dnl "onlinedocs/configopts.html#whatever"
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esac
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]],
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[^$],
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[[
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case "$enableval" in
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yes|no) ;;
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*) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
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esac
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]],
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[[$5]]),
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[enable_]m4_bpatsubst([$1],-,_)[=][$2])
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m4_undefine([_g_switch])dnl
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m4_undefine([_g_help])dnl
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])
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dnl
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dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
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dnl the native linker is in use, all variables will be defined to something
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dnl safe (like an empty string).
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dnl
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dnl Defines:
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dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
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dnl OPT_LDFLAGS='-Wl,-O1' if possible
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dnl LD (as a side effect of testing)
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dnl Sets:
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dnl with_gnu_ld
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dnl libitm_ld_is_gold (possibly)
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dnl libitm_gnu_ld_version (possibly)
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dnl
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dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
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dnl set libitm_gnu_ld_version to 12345. Zeros cause problems.
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dnl
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AC_DEFUN([LIBITM_CHECK_LINKER_FEATURES], [
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# If we're not using GNU ld, then there's no point in even trying these
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# tests. Check for that first. We should have already tested for gld
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# by now (in libtool), but require it now just to be safe...
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test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
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test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
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AC_REQUIRE([AC_PROG_LD])
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AC_REQUIRE([AC_PROG_AWK])
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# The name set by libtool depends on the version of libtool. Shame on us
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# for depending on an impl detail, but c'est la vie. Older versions used
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# ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
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# top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
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# makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
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# set (hence we're using an older libtool), then set it.
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if test x${with_gnu_ld+set} != xset; then
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if test x${ac_cv_prog_gnu_ld+set} != xset; then
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# We got through "ac_require(ac_prog_ld)" and still not set? Huh?
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with_gnu_ld=no
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else
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with_gnu_ld=$ac_cv_prog_gnu_ld
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fi
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fi
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# Start by getting the version number. I think the libtool test already
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# does some of this, but throws away the result.
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libitm_ld_is_gold=no
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if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
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libitm_ld_is_gold=yes
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fi
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changequote(,)
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ldver=`$LD --version 2>/dev/null |
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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'`
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changequote([,])
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libitm_gnu_ld_version=`echo $ldver | \
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$AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
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# Set --gc-sections.
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if test "$with_gnu_ld" = "notbroken"; then
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# GNU ld it is! Joy and bunny rabbits!
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# All these tests are for C++; save the language and the compiler flags.
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# Need to do this so that g++ won't try to link in libstdc++
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ac_test_CFLAGS="${CFLAGS+set}"
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ac_save_CFLAGS="$CFLAGS"
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CFLAGS='-x c++ -Wl,--gc-sections'
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# Check for -Wl,--gc-sections
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# XXX This test is broken at the moment, as symbols required for linking
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# are now in libsupc++ (not built yet). In addition, this test has
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# cored on solaris in the past. In addition, --gc-sections doesn't
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# really work at the moment (keeps on discarding used sections, first
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# .eh_frame and now some of the glibc sections for iconv).
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# Bzzzzt. Thanks for playing, maybe next time.
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AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
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AC_TRY_RUN([
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int main(void)
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{
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try { throw 1; }
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catch (...) { };
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return 0;
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}
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], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
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if test "$ac_test_CFLAGS" = set; then
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CFLAGS="$ac_save_CFLAGS"
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else
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# this is the suspicious part
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CFLAGS=''
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fi
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if test "$ac_sectionLDflags" = "yes"; then
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SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
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fi
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AC_MSG_RESULT($ac_sectionLDflags)
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fi
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# Set linker optimization flags.
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if test x"$with_gnu_ld" = x"yes"; then
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OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
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fi
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AC_SUBST(SECTION_LDFLAGS)
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AC_SUBST(OPT_LDFLAGS)
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])
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dnl
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dnl Check if the linker used supports linker maps to clear hardware
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dnl capabilities. This is only supported by Sun ld at the moment.
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dnl
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dnl Defines:
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dnl HWCAP_LDFLAGS='-Wl,-M,clearcap.map' if possible
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dnl LD (as a side effect of testing)
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dnl
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AC_DEFUN([LIBITM_CHECK_LINKER_HWCAP], [
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test -z "$HWCAP_LDFLAGS" && HWCAP_LDFLAGS=''
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AC_REQUIRE([AC_PROG_LD])
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ac_save_LDFLAGS="$LDFLAGS"
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LDFLAGS="$LFLAGS -Wl,-M,$srcdir/clearcap.map"
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AC_MSG_CHECKING([for ld that supports -Wl,-M,mapfile])
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AC_TRY_LINK([], [return 0;], [ac_hwcap_ldflags=yes],[ac_hwcap_ldflags=no])
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if test "$ac_hwcap_ldflags" = "yes"; then
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HWCAP_LDFLAGS="-Wl,-M,$srcdir/clearcap.map $HWCAP_LDFLAGS"
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fi
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AC_MSG_RESULT($ac_hwcap_ldflags)
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LDFLAGS="$ac_save_LDFLAGS"
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AC_SUBST(HWCAP_LDFLAGS)
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AM_CONDITIONAL(HAVE_HWCAP, test $ac_hwcap_ldflags != no)
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])
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dnl
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dnl Add version tags to symbols in shared library (or not), additionally
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dnl marking other symbols as private/local (or not).
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dnl
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dnl --enable-symvers=style adds a version script to the linker call when
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dnl creating the shared library. The choice of version script is
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dnl controlled by 'style'.
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dnl --disable-symvers does not.
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dnl + Usage: LIBITM_ENABLE_SYMVERS[(DEFAULT)]
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dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
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dnl choose a default style based on linker characteristics. Passing
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dnl 'no' disables versioning.
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dnl
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AC_DEFUN([LIBITM_ENABLE_SYMVERS], [
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LIBITM_ENABLE(symvers,yes,[=STYLE],
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[enables symbol versioning of the shared library],
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[permit yes|no|gnu*|sun])
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# If we never went through the LIBITM_CHECK_LINKER_FEATURES macro, then we
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# don't know enough about $LD to do tricks...
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AC_REQUIRE([LIBITM_CHECK_LINKER_FEATURES])
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# Turn a 'yes' into a suitable default.
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if test x$enable_symvers = xyes ; then
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# FIXME The following test is too strict, in theory.
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if test $enable_shared = no || test "x$LD" = x; then
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enable_symvers=no
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else
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if test $with_gnu_ld = yes ; then
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enable_symvers=gnu
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else
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case ${target_os} in
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# Sun symbol versioning exists since Solaris 2.5.
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solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
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enable_symvers=sun ;;
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*)
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enable_symvers=no ;;
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esac
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fi
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fi
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fi
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# Check if 'sun' was requested on non-Solaris 2 platforms.
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if test x$enable_symvers = xsun ; then
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case ${target_os} in
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solaris2*)
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# All fine.
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;;
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*)
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# Unlikely to work.
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AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
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AC_MSG_WARN([=== you are not targetting Solaris 2.])
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AC_MSG_WARN([=== Symbol versioning will be disabled.])
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enable_symvers=no
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;;
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esac
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fi
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# Check to see if libgcc_s exists, indicating that shared libgcc is possible.
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if test $enable_symvers != no; then
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AC_MSG_CHECKING([for shared libgcc])
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ac_save_CFLAGS="$CFLAGS"
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CFLAGS=' -lgcc_s'
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AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes, libitm_shared_libgcc=no)
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CFLAGS="$ac_save_CFLAGS"
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|
if test $libitm_shared_libgcc = no; then
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|
cat > conftest.c <<EOF
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int main (void) { return 0; }
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|
EOF
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changequote(,)dnl
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libitm_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
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-shared -shared-libgcc -o conftest.so \
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conftest.c -v 2>&1 >/dev/null \
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| sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
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changequote([,])dnl
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rm -f conftest.c conftest.so
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|
if test x${libitm_libgcc_s_suffix+set} = xset; then
|
|
CFLAGS=" -lgcc_s$libitm_libgcc_s_suffix"
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|
AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes)
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|
CFLAGS="$ac_save_CFLAGS"
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|
fi
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fi
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AC_MSG_RESULT($libitm_shared_libgcc)
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fi
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|
# For GNU ld, we need at least this version. The format is described in
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|
# LIBITM_CHECK_LINKER_FEATURES above.
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|
libitm_min_gnu_ld_version=21400
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|
# XXXXXXXXXXX libitm_gnu_ld_version=21390
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|
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|
# Check to see if unspecified "yes" value can win, given results above.
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|
# Change "yes" into either "no" or a style name.
|
|
if test $enable_symvers != no && test $libitm_shared_libgcc = yes; then
|
|
if test $with_gnu_ld = yes; then
|
|
if test $libitm_gnu_ld_version -ge $libitm_min_gnu_ld_version ; then
|
|
enable_symvers=gnu
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|
elif test $libitm_ld_is_gold = yes ; then
|
|
enable_symvers=gnu
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|
else
|
|
# The right tools, the right setup, but too old. Fallbacks?
|
|
AC_MSG_WARN(=== Linker version $libitm_gnu_ld_version is too old for)
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|
AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
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|
AC_MSG_WARN(=== You would need to upgrade your binutils to version)
|
|
AC_MSG_WARN(=== $libitm_min_gnu_ld_version or later and rebuild GCC.)
|
|
if test $libitm_gnu_ld_version -ge 21200 ; then
|
|
# Globbing fix is present, proper block support is not.
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|
dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.])
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|
dnl enable_symvers=???
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|
AC_MSG_WARN([=== Symbol versioning will be disabled.])
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|
enable_symvers=no
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|
else
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|
# 2.11 or older.
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|
AC_MSG_WARN([=== Symbol versioning will be disabled.])
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|
enable_symvers=no
|
|
fi
|
|
fi
|
|
elif test $enable_symvers = sun; then
|
|
: All interesting versions of Sun ld support sun style symbol versioning.
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|
else
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|
# just fail for now
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|
AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
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|
AC_MSG_WARN([=== either you are not using a supported linker, or you are])
|
|
AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
|
|
AC_MSG_WARN([=== Symbol versioning will be disabled.])
|
|
enable_symvers=no
|
|
fi
|
|
fi
|
|
|
|
AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
|
|
AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu)
|
|
AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun)
|
|
AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
|
|
])
|