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I'm using Ubuntu 16.04 x86_64 and LLVM 5.0 and would like to compile a project to a single LLVM IR bitcode file using CMake. I know there is a way to do this using the GOLD Linker with the LLVM Plugin and add the CMake linker flags "-fuse-ld=gold -Wl,-plugin-opt=emit-llvm" and the CXX flag "-flto".

But when I try to compile the project with the LLVM LLD linker and the "-fuse-ld=lld -Wl,-plugin-opt=emit-llvm" respectively "-flto" Flag, the linker is generating a native executable and no LLVM IR file. I was searching for other LLD options to emit a LLVM IR file but found nothing.

Is there a way (or option) to generate a single LLVM IR file using LLD?

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  • Are you sure this is not working for you? I didn't try this myself, but this article promises it should work: gbalats.github.io/2015/12/10/…. Commented Oct 26, 2017 at 15:27
  • Yes the GOLD Linker can emit a single LLVM IR file. But I would like to have the ability to generate a single LLVM IR bitcode file OR a native executable. The project should link to a static LLVM IR Library and the GOLD Linker can't link to it while generating a native executable. So the LLD Linker can do this, but I don't know how to generate a LLVM IR file with the LLD. Commented Oct 27, 2017 at 7:04

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You can use the -save-temps option.

clang -flto -fuse-ld=lld -Wl,-save-temps a.o b.o -o myprogram

This will generate myprogramXYZ.precodegen.bc among other files. You can then use llvm-dis to get it in readable IR format.

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