Bug 907889

Summary:	dev-util/include-what-you-use: linker error: multiple undefined reference with LLVM 16.0.5
Product:	Gentoo Linux	Reporter:	foearb <stffn.mobil>
Component:	Current packages	Assignee:	Gentoo Linux bug wranglers <bug-wranglers>
Status:	RESOLVED INVALID
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	AMD64
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	emerge --info include-what-you-use build.log

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 archtester

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 archtester

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 archtester

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++.