[Mlir-commits] [clang] [flang] [llvm] [mlir] [polly] [CMake][LLVM] Add PCH infrastructure and LLVMSupport PCH (PR #176420)

[Florian Hahn]

fhahn wrote:

It looks like this also breaks ThinLTO bootstrap builds on macOS: 
```
18:08:40  error: precompiled file '/Users/ec2-user/jenkins/workspace/m.org_clang-stage2-Rthinlto_main/clang-build/Build/lib/Support/CMakeFiles/LLVMSupport.dir/cmake_pch.hxx.pch' cannot be loaded due to a configuration mismatch with the current compilation [-Wmodule-file-config-mismatch]
```

https://ci.swift.org/job/llvm.org/job/clang-stage2-Rthinlto/job/main/21/console

https://github.com/llvm/llvm-project/pull/176420