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Test whether libgcc or kernel defines __sync_bool_compare_and_swap_4.

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From-SVN: r169504
This commit is contained in:
Ian Lance Taylor 2011-02-01 21:23:07 +00:00
parent 56490b7406
commit a7c48c8ec5
4 changed files with 47 additions and 1 deletions
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4
libgo/config.h.in
View File

@ -39,6 +39,10 @@
/* Define to 1 if you have the `strsignal' function. */
#undef HAVE_STRSIGNAL
/* Define to 1 if the compiler provides the __sync_bool_compare_and_swap
function for uint32 */
#undef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4
/* Define to 1 if you have the <syscall.h> header file. */
#undef HAVE_SYSCALL_H

28
libgo/configure vendored
View File

@ -14099,6 +14099,34 @@ fi
done
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __sync_bool_compare_and_swap_4" >&5
$as_echo_n "checking for __sync_bool_compare_and_swap_4... " >&6; }
if test "${libgo_cv_func___sync_bool_compare_and_swap_4+set}" = set; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
typedef unsigned int uint32 __attribute__ ((mode (SI)));
uint32 i;
int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
libgo_cv_func___sync_bool_compare_and_swap_4=yes
else
libgo_cv_func___sync_bool_compare_and_swap_4=no
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_func___sync_bool_compare_and_swap_4" >&5
$as_echo "$libgo_cv_func___sync_bool_compare_and_swap_4" >&6; }
if test "$libgo_cv_func___sync_bool_compare_and_swap_4" = "yes"; then
$as_echo "#define HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether compiler supports -minline-all-stringops" >&5
$as_echo_n "checking whether compiler supports -minline-all-stringops... " >&6; }
if test "${libgo_cv_c_stringops+set}" = set; then :

14
libgo/configure.ac
View File

@ -332,6 +332,20 @@ AC_CHECK_HEADERS(sys/mman.h syscall.h sys/epoll.h sys/ptrace.h sys/user.h sys/ut
AM_CONDITIONAL(HAVE_SYS_MMAN_H, test "$ac_cv_header_sys_mman_h" = yes)
AC_CHECK_FUNCS(srandom random strsignal)
AC_CACHE_CHECK([for __sync_bool_compare_and_swap_4],
[libgo_cv_func___sync_bool_compare_and_swap_4],
[AC_LINK_IFELSE([
typedef unsigned int uint32 __attribute__ ((mode (SI)));
uint32 i;
int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
],
[libgo_cv_func___sync_bool_compare_and_swap_4=yes],
[libgo_cv_func___sync_bool_compare_and_swap_4=no])])
if test "$libgo_cv_func___sync_bool_compare_and_swap_4" = "yes"; then
AC_DEFINE(HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4, 1,
[Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint32])
fi
dnl For x86 we want to use the -minline-all-stringops option to avoid
dnl forcing a stack split when calling memcpy and friends.
AC_CACHE_CHECK([whether compiler supports -minline-all-stringops],

2
libgo/runtime/thread.c
View File

@ -77,7 +77,7 @@ runtime_destroylock(Lock *l)
sem_destroy(&l->sem);
}
#ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
#ifndef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4
// For targets which don't have the required sync support. Really
// this should be provided by gcc itself. FIXME.