Can't emerge Firefox on a fresh LLVM install

[luke_]

Hey all, I have a fairly new install using the "default/linux/amd64/23.0/llvm/systemd" profile and corresponding stage3 build. I've had no issues so far really building all of the XFCE4 desktop but Firefox is giving me some trouble. According to the build info it should be using clang/llvm:

[luke_]

I did some more digging with this and had a bit of a success. So the LLVM-systemd profile sets up everything to use libc++ as the standard C++ library (maybe obviously?) and I figured I'd try to compile Firefox against the GCC one (libstdc++) by creating an environment override just for that package like so:

[Juippisi]

IIRC there's a problem exactly when using libc++-18. So you can downgrade to llvm-17 toolchain and use that, or compile firefox with "-clang" use flag to force using gcc.

The point of using system-wide libc++ is that you then can get rid of gcc and glibc. If you force usage of libstdc++ on pure llvm profile - then you shouldn't be using the llvm profile :) you can go system-wide clang/llvm (with gcc & glibc installed) using any default profile too.

Mixing libc++ and libstdc++ like that is a pretty sure way to break things along the way.

[luke_]

Yeah I was mostly trying different workarounds. For now firefox:rapid builds and works with the latest llvm. I'm also kind of curious when you say it's a known issue, I looked everywhere I could for issues, bugs and open PRs around the Firefox package and couldn't find anything. Do you have any pointers where to look for this stuff in the future?

[Juippisi]