<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/57037>57037</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            LLVM 15.0.0-rc2: compiler_rt does not build out of the box on older macOS: Failed to determine SDK version for "iphonesimulator" SDK
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          debohman
      </td>
    </tr>
</table>

<pre>
    ```
CMake Error at /tera/tera/debo/Projects/llvm/llvmorg-15.0.0-rc2/compiler-rt/cmake/Modules/CompilerRTDarwinUtils.cmake:73 (message):
  Failed to determine SDK version for "iphonesimulator" SDK
Call Stack (most recent call first):
  /tera/tera/debo/Projects/llvm/llvmorg-15.0.0-rc2/compiler-rt/cmake/builtin-config-ix.cmake:120 (find_darwin_sdk_version)
  CMakeLists.txt:51 (include)


-- Configuring incomplete, errors occurred!
See also "/tera/tera/debo/Projects/llvm/llvmorg-15.0.0-rc2-build/runtimes/builtins-bins/CMakeFiles/CMakeOutput.log".
See also "/tera/tera/debo/Projects/llvm/llvmorg-15.0.0-rc2-build/runtimes/builtins-bins/CMakeFiles/CMakeError.log".
FAILED: runtimes/builtins-stamps/builtins-configure /tera/tera/debo/Projects/llvm/llvmorg-15.0.0-rc2-build/runtimes/builtins-stamps/builtins-configure
```
Configuration:
```
cmake -G Ninja -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_EXE_LINKER_FLAGS=-L/usr/local/lib -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_ENABLE_PROJECTS="clang" -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind;compiler-rt" ../llvmorg-15.0.0-rc2/llvm
```
I was able to build it by changing the configuration in ```build/runtimes/builtins-bins/CMakeCache.txt```:
```
COMPILER_RT_ENABLE_IOS:BOOL=OFF
```
macOS 10.12.6
cmake version 3.24.0

</pre>
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