[LLVM19] library packages are no longer multi-arch capable (installation of eg. i386 and amd64 in parallel is impossible)

[TheRealCuran]

The newest batch of LLVM 19 packages from apt.llvm.org (1:19~++20240222101030+ae3e14276b71-1exp120240222221201.1911) install binary files like libLLVM no longer into their multi-arch directories, but into /usr/lib directly:

$ dpkg-deb -c libllvm19_1%3a19~++20240222101030+ae3e14276b71-1~exp1~20240222221201.1911_amd64.deb 
drwxr-xr-x root/root         0 2024-02-22 23:12 ./
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/lib/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/lib/llvm-19/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/lib/llvm-19/lib/
-rw-r--r-- root/root 124842264 2024-02-22 23:12 ./usr/lib/llvm-19/lib/libLLVM.so.1
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/lib/x86_64-linux-gnu/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/doc/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/doc/libllvm19/
-rw-r--r-- root/root     36373 2024-02-22 23:12 ./usr/share/doc/libllvm19/changelog.Debian.gz
-rw-r--r-- root/root      6897 2024-02-22 23:09 ./usr/share/doc/libllvm19/copyright
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/lintian/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/lintian/overrides/
-rw-r--r-- root/root       122 2024-02-22 23:12 ./usr/share/lintian/overrides/libllvm19
lrwxrwxrwx root/root         0 2024-02-22 23:12 ./usr/lib/llvm-19/lib/libLLVM.so.19.0 -> libLLVM.so.1
lrwxrwxrwx root/root         0 2024-02-22 23:12 ./usr/lib/x86_64-linux-gnu/libLLVM-19.so -> libLLVM-19.so.1
$ dpkg-deb -c libllvm19_1%3a19~++20240222101030+ae3e14276b71-1~exp1~20240222221201.1911_i386.deb 
drwxr-xr-x root/root         0 2024-02-22 23:12 ./
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/lib/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/lib/i386-linux-gnu/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/lib/llvm-19/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/lib/llvm-19/lib/
-rw-r--r-- root/root 140601144 2024-02-22 23:12 ./usr/lib/llvm-19/lib/libLLVM.so.1
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/doc/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/doc/libllvm19/
-rw-r--r-- root/root     36373 2024-02-22 23:12 ./usr/share/doc/libllvm19/changelog.Debian.gz
-rw-r--r-- root/root      6897 2024-02-22 23:09 ./usr/share/doc/libllvm19/copyright
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/lintian/
drwxr-xr-x root/root         0 2024-02-22 23:12 ./usr/share/lintian/overrides/
-rw-r--r-- root/root       122 2024-02-22 23:12 ./usr/share/lintian/overrides/libllvm19
lrwxrwxrwx root/root         0 2024-02-22 23:12 ./usr/lib/i386-linux-gnu/libLLVM-19.so -> libLLVM-19.so.1
lrwxrwxrwx root/root         0 2024-02-22 23:12 ./usr/lib/llvm-19/lib/libLLVM.so.19.0 -> libLLVM.so.1

On top of that the names and symlinks are really messed up too (libLLVM.so.1) can only be in one package, if the next LLVM 20 packages try to ship this too, then you can't have multiple LLVM versions in parallel. Something that is quite essential on how breakage-happy LLVM is across major versions. And also the libLLVM-19.so symlink just leads nowhere.

This makes the current packages unusable on a multi-arch setup as for example needed with 32 bit applications, requiring eg. OpenGL through Mesa, as I can't install libllvm19:amd64 and libllvm19:i386 in parallel.

Please restore the previous behaviour of having the binary arch-dependant files in their respective multi-arch directories like /usr/lib/x86_64-linux-gnu and have them named in a way, that makes having multiple LLVM versions installed and usable in parallel. Settling on something like libLLVM.so.19.0 instead of libLLVM-19.so.1 is perfectly fine, just no libLLVM.so.1 please.

[LW-archlinux]

Not a duplicate but has similariites with #82647

Also check #82660

[TheRealCuran]

Just to make sure: this is not a simple fix in the .install files. You need to make sure that e.g. the generated CMake files also contain the correct paths and names.

Locally I have "fixed" all of this and been able to build a new round of the Mesa stack including the spirv-llvm-translator.

[TheRealCuran]

The conflicting libLLVM.so.1 and broken symlinks are still present in 1:19~++20240228111504+fd336c33b6c9-1~exp1~20240228111638.1922

[sylvestre]

ok :/
it will take me sometime to bring back the multi arch capability after these changes :(

[TheRealCuran]

Thanks for the update. Then I'll just have to keep "fixing" (ie. moving files and editing eg. LLVMExports-relwithdebinfo.cmake) locally. Not nice, but it'll work for a while.

[TheRealCuran]

This particular issue is fixed for me with the current LLVM 19 packages from Debian and also the LLVM 20 packages from apt.llvm.org, therefore I am closing this issue.

[serhii-nakon]

Currently no i386 packages in repositories at all...

[sylvestre]

@serhii-nakon for which distro version? thanks

[sylvestre]

for example, Debian unstable has it:
https://apt.llvm.org/unstable/pool/main/l/llvm-toolchain-snapshot/libclang-common-20-dev_20~++20241022100635+d98519715617-1~exp1~20241022220750.2418_i386.deb

[serhii-nakon]

@sylvestre I use Debian Bookworm - here no packages for i386 at all

[sylvestre]

@serhii-nakon could you please a new issue? It is unrelated to this one.
thanks

[serhii-nakon]

@sylvestre Ok

[sylvestre]

thanks :)

[serhii-nakon]

@sylvestre #113438