[Bug 101484] [regression, bisected] Steam fails to render content, if mesa is compiled with -O2 -march=haswell

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=101484

--- Comment #14 from LoneVVolf <lonewolf@xs4all.nl> ---
(In reply to Gregor Münch from comment #5)
> Ive tested this now, and again its a compiler flags issue.
> Arch standard clfags are:
> CFLAGS="-march=native -O2 -pipe -fstack-protector-strong"
> 

for clarity, default on archlinux is NOT -march=native .

The current pacman version is 5.0.2-2 and it has these defaults :

# ARCHITECTURE, COMPILE FLAGS
#########################################################################
#
CARCH="x86_64"
CHOST="x86_64-pc-linux-gnu"

#-- Compiler and Linker Flags
# -march (or -mcpu) builds exclusively for an architecture
# -mtune optimizes for an architecture, but builds for whole processor family
CPPFLAGS="-D_FORTIFY_SOURCE=2"
CFLAGS="-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
-fno-plt"
CXXFLAGS="-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
-fno-plt"
LDFLAGS="-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now"
#-- Make Flags: change this for DistCC/SMP systems
#MAKEFLAGS="-j2"
#-- Debugging flags
DEBUG_CFLAGS="-g -fvar-tracking-assignments"
DEBUG_CXXFLAGS="-g -fvar-tracking-assignments"

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