Building with LTO and Clang 20 on Debian fails to link #161821

Bug report

Debian Trixie does not ship LLVMgold.so and if you configure CPython with "clang-20" and --with-lto, it will fail to link. You can explicitly tell Clang to use lld as the linker, which will work, if you install that package. I think configure should detect this situation and use lld.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-161821: Fall back to lld for Clang LTO builds #161822