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Fix __sync_val_compare_and_swap detection

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We should use the second argument of AC_TRY_LINK.
Otherwise, the main function defined twice and this test does never succeed.



git-svn-id: https://google-glog.googlecode.com/svn/trunk@102 eb4d4688-79bd-11dd-afb4-1d65580434c0
This commit is contained in:
2012-01-12 06:15:52 +00:00
parent 6febec361e
commit 6232847ecb
2 changed files with 3 additions and 3 deletions
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4
configure vendored
View File

@ -15172,11 +15172,11 @@ else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */ /* end confdefs.h. */
int main() { int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0; }
int int
main () main ()
{ {
int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0;
; ;
return 0; return 0;
} }

2
m4/ac_have_sync_val_compare_and_swap.m4
View File

@ -2,8 +2,8 @@ AC_DEFUN([AX_C___SYNC_VAL_COMPARE_AND_SWAP], [
AC_MSG_CHECKING(for __sync_val_compare_and_swap) AC_MSG_CHECKING(for __sync_val_compare_and_swap)
AC_CACHE_VAL(ac_cv___sync_val_compare_and_swap, [ AC_CACHE_VAL(ac_cv___sync_val_compare_and_swap, [
AC_TRY_LINK( AC_TRY_LINK(
[int main() { int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0; }],
[], [],
[int a; if (__sync_val_compare_and_swap(&a, 0, 1)) return 1; return 0;],
ac_cv___sync_val_compare_and_swap=yes, ac_cv___sync_val_compare_and_swap=yes,
ac_cv___sync_val_compare_and_swap=no ac_cv___sync_val_compare_and_swap=no
)]) )])