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check that the version of __sync_sub_and_fetch that returns a value is supported, not just the void one

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50480 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík 2007-12-05 10:51:28 +00:00
parent c615a3f57b
commit 9d5507f7a2
2 changed files with 11 additions and 5 deletions
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7
build/aclocal/atomic_builtins.m4
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@ -6,14 +6,17 @@ AC_DEFUN([WX_ATOMIC_BUILTINS],
[
AC_REQUIRE([AC_PROG_CC])
if test -n "$GCC"; then
AC_MSG_CHECKING([for __sync_fetch_* builtins])
AC_MSG_CHECKING([for __sync_fetch_and_add and __sync_sub_and_fetch builtins])
AC_CACHE_VAL(wx_cv_cc_gcc_atomic_builtins, [
AC_TRY_LINK(
[],
[
unsigned int value=0;
__sync_fetch_and_add(&value, 1);
/* wxAtomicInc doesn't use return value here */
__sync_fetch_and_add(&value, 2);
__sync_sub_and_fetch(&value, 1);
/* but wxAtomicDec does, so mimic that: */
unsigned int r2 = __sync_sub_and_fetch(&value, 1);
],
wx_cv_cc_gcc_atomic_builtins=yes,
wx_cv_cc_gcc_atomic_builtins=no)

9
configure vendored
View File

@ -24772,8 +24772,8 @@ fi
if test -n "$GCC"; then
{ echo "$as_me:$LINENO: checking for __sync_fetch_* builtins" >&5
echo $ECHO_N "checking for __sync_fetch_* builtins... $ECHO_C" >&6; }
{ echo "$as_me:$LINENO: checking for __sync_fetch_and_add and __sync_sub_and_fetch builtins" >&5
echo $ECHO_N "checking for __sync_fetch_and_add and __sync_sub_and_fetch builtins... $ECHO_C" >&6; }
if test "${wx_cv_cc_gcc_atomic_builtins+set}" = set; then
echo $ECHO_N "(cached) $ECHO_C" >&6
else
@ -24790,8 +24790,11 @@ main ()
{
unsigned int value=0;
__sync_fetch_and_add(&value, 1);
/* wxAtomicInc doesn't use return value here */
__sync_fetch_and_add(&value, 2);
__sync_sub_and_fetch(&value, 1);
/* but wxAtomicDec does, so mimic that: */
unsigned int r2 = __sync_sub_and_fetch(&value, 1);
;
return 0;