[PATCH] D99621: [CMake][Compiler-rt] Make it possible to configure standalone compiler-rt without `LLVMConfig.cmake`.

Tue Mar 30 23:41:14 PDT 2021

mstorsjo added a comment.

In D99621#2660149 <https://reviews.llvm.org/D99621#2660149>, @delcypher wrote:

> In D99621#2660131 <https://reviews.llvm.org/D99621#2660131>, @vitalybuka wrote:
>
>> On Linux "CC=gcc CXX=g++ cmake -G Ninja -DCOMPILER_RT_INCLUDE_TESTS=ON ../../llvm-project/compiler-rt" works for me without the patch
>
> @vitalybuka I suspect CMake is finding a copy of `llvm-config` to use and that the path printed out by `llvm-config --cmake-dir` points into a directory that has usable CMake files generated by an LLVM build.

It's fully possible to build compiler-rt without that, too, see lines 216-220 in CompilerRTUtils.cmake, with the "UNSUPPORTED COMPILER-RT CONFIGURATION DETECTED: llvm-config not found. Reconfigure with -DLLVM_CONFIG_PATH=path/to/llvm-config." warning. It works fine to build it despite that warning, dunno what I'm missing. I guess I can't build/run tests in that config though.

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  https://reviews.llvm.org/D99621/new/

https://reviews.llvm.org/D99621