Issue 176757
Summary Setting option CLANG_DEFAULT_CXX_STDLIB=libc++ prevents compiler-rt build
Labels libc++
Assignees
Reporter pkl97
    When compiling clang (e.g. 22.1.0-rc1) like this under Red Hat Enterprise Linux 10 with gcc, the build runs fine but compiler-rt is never built:

```
cmake -G "Ninja" \
    -DCMAKE_BUILD_TYPE=Release \
 -DCMAKE_INSTALL_PREFIX=install \
    -DLLVM_ENABLE_PROJECTS="clang" \
 -DLLVM_ENABLE_RUNTIMES="compiler-rt" \
 -DCLANG_DEFAULT_CXX_STDLIB=libc++ \
    ../llvm-project/llvm

cmake --build . > output_compile.txt 2>&1
```

It turns out that removing CLANG_DEFAULT_CXX_STDLIB=libc++ from the command line leads to the expected compiler-rt build.
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