ppc64le: Undefined temporary symbol .L_MergedGlobals

[tuliom]

This has been originally reported on Fedora Linux at: https://bugzilla.redhat.com/show_bug.cgi?id=2352554
It's impacting Chromium on ppc64le.
Can only be reproduced with LLVM >= 20.

Reduced test:

__attribute__((annotate(""))) int index_;

It fails with the following error:

$ clang++ --target=powerpc64le-linux-gnu -O2 -fPIC -pthread -std=c++20 -c test.cc -o test.o
error: Undefined temporary symbol .L_MergedGlobals
1 error generated.

[llvmbot]

@llvm/issue-subscribers-backend-powerpc

Author: Tulio Magno Quites Machado Filho (tuliom)

This has been originally reported on Fedora Linux at: https://bugzilla.redhat.com/show_bug.cgi?id=2352554 It's impacting Chromium on ppc64le. Can only be reproduced with LLVM >= 20.

Reduced test:

__attribute__((annotate(""))) int index_;

It fails with the following error:

$ clang++ --target=powerpc64le-linux-gnu -O2 -fPIC -pthread -std=c++20 -c test.cc -o test.o
error: Undefined temporary symbol .L_MergedGlobals
1 error generated.

[nikic]

We should not try to merge globals in the llvm.metadata section. Unfortunately I'm having trouble reproducing this issue with a standalone global-merge invocation...

[nikic]

Unfortunately I'm having trouble reproducing this issue with a standalone global-merge invocation...

That's because the option handling for the pass is broken in so many different ways.