[Mesa-dev] PATH(s) to run Firefox with different Mesa versions

[Germano Massullo]

Good day
I am testing Firefox with various Mesa versions to find which version
started triggering the bug
<<Firefox quirks (black and/or white squares)>>
https://bugs.freedesktop.org/show_bug.cgi?id=104216

I packaged Mesa 18 for Fedora 27
https://copr-be.cloud.fedoraproject.org/results/germano/mesa_18/fedora-27-x86_64/00720216-mesa/
and then I unpacked
mesa-dri-drivers-18.0.0-0.1.rc4.fc27.x86_64.rpm
and runned Firefox with command
LIBGL_DRIVERS_PATH=/home/user/mesa-dri-drivers-18.0.0-0.1.rc4.fc27.x86_64/usr/lib64/dri/
firefox

Question: is LIBGL_DRIVERS_PATH enough to let Firefox use a different
Mesa version?
I am asking this because on the console I am getting

libGL error: unable to load driver: radeonsi_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: radeonsi
libGL error: unable to load driver: radeonsi_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: radeonsi
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
libGL error: unable to load driver: radeonsi_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: radeonsi
libGL error: unable to load driver: radeonsi_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: radeonsi
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swras

Best regards
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