Bug 907889 – dev-util/include-what-you-use: linker error: multiple undefined reference with LLVM 16.0.5

• Status: RESOLVED INVALID
• Product: Gentoo Linux

[Description foearb 2023-06-05 08:42:09 UTC]

I get multiple underfined references when linking include-what-you-use with LLVM 16.0.5.

Reproducible: Always

Steps to Reproduce:
1. Emerge Clang and LLVM 16.0.5
2. Emerge include-what-you-use-0.20
Actual Results:  
Link fails.

Expected Results:  
Link succeeds

[Comment 1 Sam James 2023-06-05 08:43:20 UTC]

Please include the full build.log and emerge --info.

[Comment 2 foearb 2023-06-05 08:47:30 UTC]

Created attachment 863319 [details]
emerge --info include-what-you-use

[Comment 3 foearb 2023-06-05 08:47:59 UTC]

Compiles with Clang.

[Comment 4 foearb 2023-06-05 08:48:48 UTC]

Created attachment 863320 [details]
build.log

[Comment 5 Sam James 2023-06-05 08:50:43 UTC]

-- IWYU: configuring for LLVM 16.0.5+libcxx from /usr/lib/llvm/16/lib64/cmake/llvm

This makes it sound like you're mixing libstdc++ and libcxx which is invalid.

[Comment 6 foearb 2023-06-05 08:53:42 UTC]

Right, I have my LLVM stack compiled with Clang, but that linker error didn't happen before that...
I have linker issue with mesa[llvm] as well.

[Comment 7 Sam James 2023-06-05 08:56:45 UTC]

(In reply to nobounce from comment #6)
> Right, I have my LLVM stack compiled with Clang, but that linker error
> didn't happen before that...

That doesn't matter, unfortunately. If something links with LLVM, it's going to get libcxx gunk.

It's okay to build LLVM with Clang, but if you're going to do it with libcxx *as well*, you can't mix it with libstdc++.