To answer second question. When you don't include

EXTRA_OECMAKE:append:class-native = "\
-DLLVM_LIBDIR_SUFFIX=64 \
"

meson configure fails with
....
....
....
| llvm-config found: YES 
(/../../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/bin/crossscripts/llvm-config15.0.1)
 15.0.1
| Run-time dependency LLVM (modules: amdgpu, asmparser, bitreader, bitwriter, 
core, engine, executionengine, instcombine, ipo, mcdisassembler, mcjit, native, 
scalaropts, transformutils, coroutines) found: NO (tried cmake and config-tool)
| Building fallback subproject with default_library=shared
|
| ../mesa-22.2.2/meson.build:1783:2: ERROR: Neither a subproject directory nor 
a llvm.wrap file was found.
|
| A full log can be found at 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/build/meson-logs/meson-log.txt
....
....
....

Now if you

$ cat < 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/build/meson-logs/meson-log.txt

You see

llvm-config found: YES 
(/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/bin/crossscripts/llvm-config15.0.1)
 15.0.1
llvm-config --shared-mode returned an error
Run-time dependency LLVM (modules: amdgpu, asmparser, bitreader, bitwriter, 
core, engine, executionengine, instcombine, ipo, mcdisassembler, mcjit, native, 
scalaropts, transformutils, coroutines) found: NO (tried cmake and config-tool)

Now run llvm-config --shared-mode directly you see

$ llvm-config --shared-mode
llvm-config: error: component libraries and shared library
....
....
....
....
llvm-config: error: missing: 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/lib/libLLVMMCParser.a
llvm-config: error: missing: 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/lib/libLLVMTextAPI.a
llvm-config: error: missing: 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/lib/libLLVMObject.a
llvm-config: error: missing: 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/lib/libLLVMDebugInfoDWARF.a
llvm-config: error: missing: 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/lib/libLLVMDebugInfoMSF.a
llvm-config: error: missing: 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/lib/libLLVMDebugInfoPDB.a
....
....
....
....

../mesa/2_22.2.2-r0/mesa-22.2.2# llvm-config --libdir
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr/lib

../mesa/2_22.2.2-r0/mesa-22.2.2# ls 
/../../.../../../../../../../tmp/work/amd64-northstar-linux/mesa/2_22.2.2-r0/recipe-sysroot/usr
bin  include  lib64  share

That folder doesn't exists for me.

Also another false statement on my end its llvm-config that hard sets directory 
where to load libs.
mesa never calls llvm-config --libdir.
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