mesa: use build flag to ensure stack is realigned on x86

Graphics / Mesa 3D Graphics Library / Mesa - Timothy Arceri [yahoo.com.au] - 9 December 2014 14:35 UTC

Nowadays GCC assumes stack pointer is 16-byte aligned even on 32-bits, but that is an assumption OpenGL drivers (or any dynamic library for that matter) can't afford to make as there are many closed- and open- source application binaries out there that only assume 4-byte stack alignment.

V4: fix comment and indentation

V3: move all sse4.1 build flag config to the same location and add comment as to why we need to do the realign

V2: use $target_cpu rather than $host_cpu and setup build flags in config rather than makefile

https://bugs.freedesktop.org/show_bug.cgi?id=86788

f1b5f2b mesa: use build flag to ensure stack is realigned on x86
configure.ac | 11 ++++++++++-
src/mesa/Makefile.am | 2 +-
src/mesa/main/sse_minmax.c | 3 ---
3 files changed, 11 insertions(+), 5 deletions(-)

Upstream: cgit.freedesktop.org

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