[Bug ipa/113203] __attribute__ ((always_inline)) fails with C99/LTO/-Og.

["stefan at bytereef dot org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113203

--- Comment #4 from Stefan Krah <stefan at bytereef dot org> ---
> Or, if the intention is that all calls to the function within its TU
> are inlined and not the other ones, split the function into two, one
> always_inline which is used from within the TU and another one which
> just calls it and is used from other TUs.

Yes, that's the intention. The real project has more than 100 functions in
mpdecimal.c. I'm using C99 inline to both automatically inline functions
specifically in that TU but generate regular functions for the other TUs
and libmpdec.so.

C99 saves the work of creating the wrappers manually.


Do note that this issue started with gcc-12, same as in:

   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107931


So it's a behavior change. I agree that the combination of "-flto -Og" is not
particularly important. But is it guaranteed that the above C99 scheme will
always work with -O{1,2,3}? Or are there other loopholes that might show up
in the future?

I guess that in order to be safe I'll remove always_inline and use your wrapper
suggestion some time in the future.