Re: [Mesa3d-dev] Current tinderbox regression (swrastg_dri, sparc64)

[Luca B. <luc...@gm...>]

Are you sure that swrastg and/or any Gallium driver actually load
correctly and work on sparc64?

This seems to indicate that they use __sync_add_and_fetch_4 assuming
it is a GCC builtin, but GCC does not implement it as a builtin on
sparc64 and neither libgcc nor libc have an implementation of the
function.

I don't know anything about sparc64, but according to the linux
kernel, I vaguely guess that specifying an high enough -march= to gcc
could solve it by enabling use of atomic instructions that are
otherwise are not used.

The root cause is likely that we set PIPE_ATOMIC_GCC_INTRINSIC even
though not all __sync builtins are actually supported: we should
probably fix that.