================
@@ -6,27 +6,20 @@
#include <stdarg.h>
-#define DERP this is an error
-
void func(...) { // expected-warning {{'...' as the only parameter of a
function is incompatible with C standards before C23}}
// Show that va_start doesn't require the second argument in C23 mode.
va_list list;
- va_start(list); // expected-warning {{passing no argument for the '...'
parameter of a variadic macro is incompatible with C standards before C23}}
expected-note@* {{macro 'va_start' defined here}}
- va_end(list);
-
- // Show that va_start doesn't expand or evaluate the second argument.
- va_start(list, DERP);
+ va_start(list);
----------------
AaronBallman wrote:
> I haven't found the `*-compat` warnings ever actually helpful (if you want to
> check compat with previous versions, just build with the previous version!),
> but, given that they do exist, should a new diagnostic be emitted under
> `-Wpre-c23-compat` when __builtin_c23_va_start is called with 1-arg?
Yeah, it probably should given that `va_start(list)` won't compile under
previous language modes.
https://github.com/llvm/llvm-project/pull/131166
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