[Mesa-users] Building Mesa with LLVM in $HOME/opt

[Ken Moffat]

On Sun, Apr 26, 2020 at 05:59:04PM +0300, Ruslan Kabatsayev wrote:
> Hi,
> 
> On Sun, 26 Apr 2020 at 07:36, Jackman <kd7nyq at gmail.com> wrote:
> >
> > Good evening! I hope you are all doing well.
> >
> > My goal is simply to get OpenCL 1.2+ working on my MXLinux (Debian Buster derivative) machine with an AMD GPU.
> >
[...]
> >
> > When I try to build Mesa, however, I am still getting this error:
> >
> > Message: libdrm 2.4.100 needed because amdgpu has the highest requirement
> > Run-time dependency libdrm_intel found: YES 2.4.101
> > Run-time dependency libdrm_amdgpu found: YES 2.4.101
> > Run-time dependency libdrm_radeon found: YES 2.4.101
> > Run-time dependency libdrm_nouveau found: YES 2.4.101
> > Run-time dependency libdrm found: YES 2.4.101
> > llvm-config found: YES (/home/jackman/opt/bin/llvm-config) 10.0.0
> > Run-time dependency LLVM (modules: amdgpu, asmparser, bitreader, bitwriter, engine, ipo, mcdisassembler, mcjit, native, coroutines) found: NO (tried config-tool)
> 
> This hints that LLVM is not fully functional. In particular, if you
> look at the section for LLVM in BLFS[1], you'll find the following
> cmake option is used there:
> 
> -DLLVM_TARGETS_TO_BUILD="host;AMDGPU;BPF"
> 
> You may want to enable these targets too. Then at least the amdgpu
> module from the list should be found (not sure if the other modules
> listed have also not been found).
> 

Just to expand on that: in BLFS we added BPF for v4lutils.  The
AMDGPU target has been needed (for amdgpu, which the OP is trying to
enable) for a long time.  But we don't build any more than llvm,
clang and compiler-rt so it is possible that one of the other parts
of llvm might need another target.

For mesa itself, we have some explanation of the options - maybe
useful to reduce how much gets built.  I think we removed the new
iris target earlier, because of segfaults, or else we are going to
(not relevant to amdgpu, nor to previous versions of mesa).

OTOH, if someone is building all of it then perhaps the full set of
drivers might be what they want - for me, building more than I need
wastes time and space, but YMMV.

ĸen
-- 
He could send for Ptraci, his favourite handmaiden. She was special.
Her singing always cheered him up. Life seemed so much brighter when
she stopped.   -- Pyramids