[Bug other/96628] Feature request: __attribute__((no_builtin("Foo")))

["rafael_andreas at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96628

Rafaël Kooi <rafael_andreas at hotmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rafael_andreas at hotmail dot com
            Summary|Feature request:            |Feature request:
                   |__attribute__((no_builtin(F |__attribute__((no_builtin("
                   |oo)))                       |Foo")))

--- Comment #1 from Rafaël Kooi <rafael_andreas at hotmail dot com> ---
Clang supports __attribute__((no_builtin("memset"))) for things like
implementing memset in a CRT. This is preferable over using -fno-builtin cause
it disables all builtins, which is not optimal when it comes to possible
optimizations.

I also wasn't able to find out how to disable a specific builtin from the
commandline, which could be used as a workaround by just splitting functionally
up into more files.

Right now my CRT project doesn't work with GCC on Windows because of reliance
on this attribute, msvc ABI, and SEH support, but I would like to be able to
also compile it with GCC for portability reasons and this would be a big step.