[Bug ipa/114262] Over-inlining when optimizing for size with gnu_inline function

["lh_mouse at 126 dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114262

--- Comment #7 from LIU Hao <lh_mouse at 126 dot com> ---
(In reply to Jan Hubicka from comment #6)
> > Note GCC has not retuned its -Os heurstics for a long time because it has been
> > decent enough for most folks and corner cases like this is almost never come
> > up.
> There were quite few changes to -Os heuristics :)
> One of bigger challenges is that we do see more and more C++ code built
> with -Os which relies on certain functions to be inlined and optimized
> in context, so we had to get more optimistic in a hope that inlined code
> will optimize well.
> 
> COMDAT functions are more likely inlined because statistics shows that
> many of them are not really shared between translations units
> (see -param=comdat-sharing-probability parameter). This was necessary to
> get reasonable code for Firefox approx 15 years ago.

So is there no way to get the C99 extern inline behavior? i.e. sibling calls to
gnu_inline functions are inlined even when optimizing for size.