Commen=
t # 4
on bug 10765=
5
from Sergey Kondakov
(In reply to Michel D=C3=A4nzer from comment #3)
> GCC's libstdc++ code crashes trying to use an in=
struction not supported by
> your CPU. You need to report this to your distro.
So, I've bothered my distro's bugzilla, and gcc's, then figured out why it =
was
crashing: Mesa doesn't like being built with clang/gold and ThinLTO (Mesa
doesn't build via gcc with LTO and openSUSE's OBS can't handle gcc's LTO
implementation even if it would). I don't know the actual reason of the cra=
sh
but the guys there figured out that the crash was coming from AVX instructi=
on
in Mesa's SWR code. The affected machine does not support any kind of AVX, =
so
it threw out the error. But it's unclear why SWR even been trying to initia=
lize
during the load of r300_dri. If built without any {C,LD}FLAGS and with gcc,
nothing crashes even with SWR built and installed. And there is no trace of=
SWR
doing things at boot on AVX-capable amdgpu/radeonsi machine even with clang=
's
build.