Ross Burton, thank you for the review. The build reproduction steps and the intention for this patch can be found in the v1 patch at https://lists.openembedded.org/g/openembedded-core/topic/117252728.
PACKAGECONFIG:remove:class-native = "lto thin-lto" Due to the configuration, llvm-native cannot enable lto in PACKAGECONFIG in any way. When attempting to use clang + lto, components that cannot use the lld linker (and instead use the bfd linker) require the LLVMgold.so plugin. To achieve this, binutils and the -DLLVM_BINUTILS_INCDIR flag in CMake are required. ( https://github.com/llvm/llvm-project/blob/main/clang/docs/ThinLTO.rst#basic ) Anyway, llvm-native cannot have LTO enabled due to the `remove`. -DLLVM_ENABLE_LTO=Full determines whether LLVM itself will be built with LTO applied. However, even if LLVM is not built using LTO, I think the environment should still be configured so that other components using the LLVM/clang toolchain can use LTO.
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