[Mesa-dev] [Bug 93089] mesa fails to check for gcc atomic primitives before using them

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93089

--- Comment #11 from Jonathan Gray <jsg at openbsd.org> ---
Previously 64 bit atomics were contained to i965.  The on disk shader cache
introduced in Mesa 13.0 in 87ab26b2ab35a29d446ae66f1795d40c184c0739 now
requires 64 bit atomics as well which breaks Mesa on 32 bit powerpc which
doesn't have 64 bit atomic instructions:

glxinfo:/usr/X11R6/lib/modules/dri/r300_dri.so: undefined symbol
'__sync_add_and_fetch_8'
libGL error: unable to load driver: r300_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: r300
glxinfo:/usr/X11R6/lib/modules/dri/swrast_dri.so: undefined symbol
'__sync_add_and_fetch_8'
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
X Error of failed request:  GLXBadContext
  Major opcode of failed request:  155 (GLX)
  Minor opcode of failed request:  6 (X_GLXIsDirect)
  Serial number of failed request:  47
  Current serial number in output stream:  0
name of display: :0

This was reported by Stefan Sperling on OpenBSD/macppc along with the
workaround of using --disable-shader-cache.

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