https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91766
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |visibility
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=85678
--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Wilco from comment #4)
> (In reply to martin krastev from comment #3)
> > So it appears to be a clash between -fcommon and -fvisibility=hidden during
> > -fpic -- passing either -fno-common or -fno-pic drops the GOT indirection.
> > And explicitly hiding the symbol obviously solves it. But the crux of the
> > issue, IMO, is a multi-platform one -- that behavior deviates on gcc-8.2
> > from platform to platform. On amd64 it suffices to -fvisibility=hidden to
> > stop GOT detours, whereas on aarch64 it's -fvisibility=hidden -fno-common.
> > As a result aarch64 performance gets penalized in unsuspecting multi-plats.
>
> -fno-common should really become the default, -fcommon causes way too many
> issues.
That's bug 85678
