BukeBeyond wrote:
The following code breaks builds on Windows:
compiler-rt/cmake/Modules/CompilerRTUtils.cmake:387
runtimes/CMakeLists.txt:197
```
if (CMAKE_C_SIMULATE_ID MATCHES "MSVC")
set(option_prefix "/clang:")
endif()
```
The problem is when LLVM is built with Clang-cl, CMAKE_C_SIMULATE_ID gets MSVC.
But these sub builds switch the compiler to the newly built clang++ without
updating CMAKE_C_SIMULATE_ID, and this condition sets an invalid flag "/clang:".
https://github.com/llvm/llvm-project/pull/89425
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