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

[Michel Dänzer]

On 2018-03-06 02:27 PM, Emil Velikov wrote:
> On 6 March 2018 at 12:57, Gert Wollny <gw.fossdev at gmail.com> wrote:
>> Am Dienstag, den 06.03.2018, 13:10 +0100 schrieb Germano Massullo:
>>> Il 06/03/2018 09:06, Gert Wollny ha scritto:
>>>> Am Dienstag, den 06.03.2018, 01:10 +0100 schrieb Germano Massullo:
>>>>> Question: is LIBGL_DRIVERS_PATH enough to let Firefox use a
>>>>> different
>>>>> Mesa version?
>>>>
>>>> You will also need to set LIBGL_DRIVERS_PATH
>>>
>>> Maybe it is a typo? I already mentioned LIBGL_DRIVERS_PATH in my
>>> message
>> Sorry I kind of mixed that up, you should also set LD_LIBRARY_PATH to
>> use the mesa libraries related to the drivers. This will probably do:
>>
>> LD_LIBRARY_PATH= \
>> /home/user/mesa-dri-drivers-18.0.0-0.1.rc4.fc27.x86_64/usr/lib64
>>
> A few things that come to mind:
> 
> a) A 32/64 bit issue
> 
> For example: one is pointing to 32bit binaries, while 64bit ones are
> needed, or vice-versa.
> 
> Have _both_ present and use $LIB. The variable will expand accordingly
> - be that lib, lib32, lib64, lib/x86_64-linux-gnu or other
> 
> b) Missing/wrong dependency - libstdc++, llvm, other
> The debug hints below will help here.
> 
> 
> Note that the issue (one here or bugzilla) can be in either the
> frontend libraries or the backend DRI driver.
> 
> * For normal libraries - libGL/libEGL/libglapi, libgbm
> LD_LIBRARY_PATH=/some/chroot/usr/$LIB/
> to debug
> LD_DEBUG=libs
> 
> * For the backend DRI module - foo_dri.so
> LIBGL_DRIVERS_PATH=/some/chroot/usr/$LIB/dri
> to debug
> LIBGL_DEBUG=verbose

FWIW, I recommend using single quotes around $LIB:

LD_LIBRARY_PATH='/some/chroot/usr/$LIB/'
LIBGL_DRIVERS_PATH='/some/chroot/usr/$LIB/dri'

Otherwise the shell will substitute it with the wrong thing.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer