The llvm-18 Ubuntu Jammy (22.04) LTS binary packages don't include LLVMgold.so

[joshuaehill]

The llvm-18 release binary packages for Ubuntu Jammy (22.04) published on the LLVM Debian/Ubuntu nightly packages don't seem to include the LLVMgold.so plugin required for LTO support.

In prior versions, this was included in the linker-tools package, but this file is not presently included in the llvm-18-linker-tools package.

Using the current package set for llvm-18 when using LTO, the linker complains:
/usr/bin/ld: /usr/lib/llvm-18/bin/../lib/LLVMgold.so: error loading plugin: /usr/lib/llvm-18/bin/../lib/LLVMgold.so: cannot open shared object file: No such file or directory

[joshuaehill]

This seems to have been mentioned before, and may be related to #84271.

[MaskRay]

Thanks for the report. I created #87567

[MaskRay]

In prior versions, this was included in the linker-tools package, but this file is not presently included in the llvm-18-linker-tools package.

@sylvestre Do you know who maintains the Ubuntu packages? It seems that they started to use cmake -DLLVM_INSTALL_TOOLCHAIN_ONLY=on ?

[sylvestre]

this is me and no, we don't use LLVM_INSTALL_TOOLCHAIN_ONLY
grep on https://salsa.debian.org/pkg-llvm-team/llvm-toolchain/-/blob/18/debian/rules return 0

[MaskRay]

I confirm that the llvm-17-linker-tools package contains LLVMgold.so while llvm-18-linker-tools doesn't.

Landed #87567 to install LLVMgold.so (like we install libLTO.so) in LLVM_INSTALL_TOOLCHAIN_ONLY=on builds but @sylvestre said it might be unrelated?

https://apt.llvm.org/mantic/pool/main/l/llvm-toolchain-17/llvm-17-linker-tools_17.0.6~%2B%2B20240124120726%2B6009708b4367-1~exp1~20240124120743.47_amd64.deb

% tar tvf data.tar.zst
drwxr-xr-x root/root         0 2024-01-24 04:07 ./
drwxr-xr-x root/root         0 2024-01-24 04:07 ./usr/
drwxr-xr-x root/root         0 2024-01-24 04:07 ./usr/lib/
drwxr-xr-x root/root         0 2024-01-24 04:07 ./usr/lib/bfd-plugins/
drwxr-xr-x root/root         0 2024-01-24 04:07 ./usr/lib/llvm-17/
drwxr-xr-x root/root         0 2024-01-24 04:07 ./usr/lib/llvm-17/lib/
-rw-r--r-- root/root   4021888 2024-01-24 04:07 ./usr/lib/llvm-17/lib/LLVMPolly.so
-rw-r--r-- root/root     89848 2024-01-24 04:07 ./usr/lib/llvm-17/lib/LLVMgold.so
-rw-r--r-- root/root     69576 2024-01-24 04:07 ./usr/lib/llvm-17/lib/libLTO.so.17
drwxr-xr-x root/root         0 2024-01-24 04:07 ./usr/share/
drwxr-xr-x root/root         0 2024-01-24 04:07 ./usr/share/doc/
drwxr-xr-x root/root         0 2024-01-24 04:07 ./usr/share/doc/llvm-17-linker-tools/
-rw-r--r-- root/root     35092 2024-01-24 04:07 ./usr/share/doc/llvm-17-linker-tools/changelog.Debian.gz
-rw-r--r-- root/root      6897 2024-01-24 04:07 ./usr/share/doc/llvm-17-linker-tools/copyright
lrwxrwxrwx root/root         0 2024-01-24 04:07 ./usr/lib/bfd-plugins/LLVMgold-17.so -> ../llvm-17/lib/LLVMgold.so

https://apt.llvm.org/mantic/pool/main/l/llvm-toolchain-18/llvm-18-linker-tools_18.1.3~%2B%2B20240322073236%2Bef6d1ec07c69-1~exp1~20240322193248.98_amd64.deb

% tar tvf data.tar.zst
drwxr-xr-x root/root         0 2024-03-22 12:32 ./
drwxr-xr-x root/root         0 2024-03-22 12:32 ./usr/
drwxr-xr-x root/root         0 2024-03-22 12:32 ./usr/lib/
drwxr-xr-x root/root         0 2024-03-22 12:32 ./usr/lib/bfd-plugins/
drwxr-xr-x root/root         0 2024-03-22 12:32 ./usr/lib/llvm-18/
drwxr-xr-x root/root         0 2024-03-22 12:32 ./usr/lib/llvm-18/lib/
-rw-r--r-- root/root   3973096 2024-03-22 12:32 ./usr/lib/llvm-18/lib/LLVMPolly.so
-rw-r--r-- root/root     70328 2024-03-22 12:32 ./usr/lib/llvm-18/lib/libLTO.so.18.1
drwxr-xr-x root/root         0 2024-03-22 12:32 ./usr/share/
drwxr-xr-x root/root         0 2024-03-22 12:32 ./usr/share/doc/
drwxr-xr-x root/root         0 2024-03-22 12:32 ./usr/share/doc/llvm-18-linker-tools/
-rw-r--r-- root/root     36840 2024-03-22 12:32 ./usr/share/doc/llvm-18-linker-tools/changelog.Debian.gz
-rw-r--r-- root/root      6897 2024-03-22 12:32 ./usr/share/doc/llvm-18-linker-tools/copyright
lrwxrwxrwx root/root         0 2024-03-22 12:32 ./usr/lib/bfd-plugins/LLVMgold-18.so -> ../llvm-18/lib/LLVMgold.so

[Explorer09]

I was about to report the similar issue to Debian packages, because this affects my CI build as well (see this build log). Now I cannot use LLVM-18 with LTO anymore.

By the way, the fastest way to verify this is to see this page:
https://packages.debian.org/sid/amd64/llvm-18-linker-tools/filelist
and compare with this:
https://packages.debian.org/sid/amd64/llvm-17-linker-tools/filelist
or this:
https://packages.debian.org/experimental/amd64/llvm-19-linker-tools/filelist

And see the LLVMgold.so file is missing.