https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69407
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The fix is as easy as
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -11443,6 +11443,8 @@ resolve_overloaded_builtin (location_t loc, tree
function,
&& orig_code != BUILT_IN_ATOMIC_STORE_N)
result = sync_resolve_return (first_param, result, orig_format);
+ TREE_USED (result) = 1;
+
/* If new_return is set, assign function to that expr and cast the
result to void since the generic interface returned void. */
if (new_return)
but I've yet to see if this PR is just about __atomic_fetch_OP and
__atomic_OP_fetch intrinsics or even about the rest.
