[llvm-branch-commits] [llvm] release/19.x: Revert "[LLVM] Silence compiler-rt warning in runtimes build (#99525)" (PR #102475)

[Joseph Huber via llvm-branch-commits]

jhuber6 wrote:

> For reasons I don't understand, cmake (version 3.22.1, default on Ubuntu 22.04.4) is not producing debug output for the find_package call for LLVM if I use `cmake --debug-find`. It does produce output for other packages.
> 
> Resorting to strace -efile:
> 
> Good:
> 
> ```
> /home/ubuntu/llvm-project/compiler-rt/cmake/Modules/CompilerRTUtils.cmake(312):  find_package(LLVM HINTS /home/ubuntu/bld4 )
> access("/home/ubuntu/bld4/lib/cmake/llvm/LLVMConfig.cmake", R_OK) = 0
> ```
> 
> Bad:
> 
> ```
> /home/ubuntu/llvm-project/compiler-rt/cmake/Modules/CompilerRTUtils.cmake(312):  find_package(LLVM HINTS /home/ubuntu/llvm-project/llvm/cmake/modules )
> access("/usr/lib/llvm-14/cmake/LLVMConfig.cmake", R_OK) = 0
> ```
> 
> Not sure why cmake is ignoring the hint. It doesn't appear to test any other directories.

Do you know what `LLVM_CONFIG_PATH` is set to in this case? The old handling was to get the config path based off of that, so i'd be surprised if it were fundamentally different. The runtimes build should not be using a config that exists out-of-tree as far as I'm aware.

https://github.com/llvm/llvm-project/pull/102475