diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 1bfac3b291..421f4f3c80 100644 --- a/configure.ac +++ b/configure.ac @@ -387,6 +387,17 @@ fi AM_CONDITIONAL([SSE41_SUPPORTED], [test x$SSE41_SUPPORTED = x1]) AC_SUBST([SSE41_CFLAGS], $SSE41_CFLAGS) +dnl Check for new-style atomic builtins +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +int main() { + int n; + return __atomic_load_n(&n, __ATOMIC_ACQUIRE); +}]])], GCC_ATOMIC_BUILTINS_SUPPORTED=1) +if test "x$GCC_ATOMIC_BUILTINS_SUPPORTED" = x1; then + DEFINES="$DEFINES -DUSE_GCC_ATOMIC_BUILTINS" +fi +AM_CONDITIONAL([GCC_ATOMIC_BUILTINS_SUPPORTED], [test x$GCC_ATOMIC_BUILTINS_SUPPORTED = x1]) + dnl Check for Endianness AC_C_BIGENDIAN( little_endian=no, |