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

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

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

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Keywords|                            |documentation
                 CC|                            |hubicka at gcc dot gnu.org

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
With -Og we specifically disable IPA inlining, not considering that
always-inline functions might only appear with LTO.  I don't think that
cross-TU
"always-inline" is sensible, and we probably should not merge the always-inline
definition with the not always-inline declaration that's effective for the
call in question.  So we should accept the code at compile-time but not
honor always-inline cross-TU in the way it is presented by the testcase.
The bool f(int); declaration should force an out-of-line copy of the C99
inline, right?  And GCC always-inline doesn't change that?

Btw, the same should happen with -O2 -flto but __attribute__((optimize(0))) on
main().

It might be worth amending the always-inline documentation as well.