https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109214
sandra at gcc dot gnu.org changed:
What |Removed |Added
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CC| |sandra at gcc dot gnu.org
--- Comment #2 from sandra at gcc dot gnu.org ---
The option that controls the warning for casts between function and data
pointers is -Wpedantic. It's not explicitly documented as doing that, but the
description of the option starts out: "Issue all the warnings demanded by
strict ISO C and ISO C++; diagnose all programs that use forbidden
extensions..." It's also already documented with -Wpedantic that the way to
suppress pedantic warnings locally is by adding the __extension__ keyword
before the expression that triggers them.
IIUC it is wired into GCC that function and data pointers have the same size
(Pmode), but it's at least theoretically possible that a function pointer might
actually point to a descriptor object instead of a raw code address. I'd think
this is ABI-specific, anyway.
I'm not sure what additional documentation needs to be added here, or if what's
being requested is implementing a separate option/attribute just to control
function pointer conversion warnings.
