On Fri, 21 Oct 2022, Florian Weimer via Gcc wrote: > Is this really possible? For function pointers, it's an ABI change. > int (*) () and int (*) (void) have different calling conventions on some > ABIs (e.g., powerpc64le-linux-gnu). The ABI difference goes away once > the callees are rebuilt, and I think such rebuilt callees are compatible > with either calling convention.
The semantics of int (*) (void) are a refinement of those of pre-C2x int (*) (): any non-variadic function whose argument types are unchanged by the default argument promotions can be called through an int (*) () pointer, but only functions with no arguments can be called through an int (*) (void) pointer. -- Joseph S. Myers jos...@codesourcery.com
