diff options
| -rw-r--r-- | configure.ac | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index 34858087..626a1ce6 100644 --- a/configure.ac +++ b/configure.ac @@ -81,8 +81,8 @@ fi # GCC flags test_gcc_flag() { - AC_LANG_CONFTEST([int main() {}]) - $CC -c conftest.c $CFLAGS $@ > /dev/null 2> /dev/null + AC_LANG_CONFTEST([int main(int argc, char*argv[]) {}]) + $CC -c conftest.c $CFLAGS -o conftest.o > /dev/null 2> /dev/null ret=$? rm -f conftest.o return $ret @@ -106,6 +106,18 @@ if test "x$GCC" = "xyes" ; then done fi +AC_MSG_CHECKING([whether $CC knows __sync_bool_compare_and_swap()]) +AC_LANG_CONFTEST([int main() { int a = 4; __sync_bool_compare_and_swap(&a, 4, 5); }]) +$CC conftest.c $CFLAGS -o conftest > /dev/null 2> /dev/null +ret=$? +rm -f conftest.o conftest +if test $ret -eq 0 ; then + AC_DEFINE([HAVE_ATOMIC_BUILTINS], 1, [Have __sync_bool_compare_and_swap() and friends.]) + AC_MSG_RESULT([yes]) +else + AC_MSG_RESULT([no]) +fi + #### libtool stuff #### AC_LTDL_ENABLE_INSTALL |