diff options
Diffstat (limited to 'm4/fp_gcc_supports__atomics.m4')
| -rw-r--r-- | m4/fp_gcc_supports__atomics.m4 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/m4/fp_gcc_supports__atomics.m4 b/m4/fp_gcc_supports__atomics.m4 new file mode 100644 index 0000000000..81fc44c500 --- /dev/null +++ b/m4/fp_gcc_supports__atomics.m4 @@ -0,0 +1,17 @@ +# FP_GCC_SUPPORTS__ATOMICS +# ------------------------ +# Does gcc support the __atomic_* family of builtins? +AC_DEFUN([FP_GCC_SUPPORTS__ATOMICS], +[ + AC_REQUIRE([AC_PROG_CC]) + AC_MSG_CHECKING([whether GCC supports __atomic_ builtins]) + echo 'int test(int *x) { int y; __atomic_load(x, &y, __ATOMIC_SEQ_CST); return y; }' > conftest.c + if $CC -c conftest.c > /dev/null 2>&1; then + CONF_GCC_SUPPORTS__ATOMICS=YES + AC_MSG_RESULT([yes]) + else + CONF_GCC_SUPPORTS__ATOMICS=NO + AC_MSG_RESULT([no]) + fi + rm -f conftest.c conftest.o +]) |