<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/82205>82205</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h:164:9: error: no viable conversion from '__llvm_libc_19_0_0_git::fputil::FPBits<float>' to 'float'
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            build-problem,
            libc
      </td>
    </tr>

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

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

<pre>
    I'm building on macOS using Xcode 15.2 with my repo at commit `79709498eaa5` and hitting these errors:

```
/Users/rudkx/src/llvm-project/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h:164:9: error: no viable conversion from '__llvm_libc_19_0_0_git::fputil::FPBits<float>' to 'float'
  164 |   float large_value = FPBits<float>::max_normal();
      |         ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/rudkx/src/llvm-project/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h:165:9: error: no viable conversion from '__llvm_libc_19_0_0_git::fputil::FPBits<float>' to 'float'
  165 |   float small_value = FPBits<float>::min_normal();
      |         ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/rudkx/src/llvm-project/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h:280:33: error: implicit conversion loses integer precision: 'const uint64_t' (aka 'const unsigned long long') to 'uint32_t' (aka 'unsigned int') [-Werror,-Wshorten-64-to-32]
  280 | FEnv::set_control_word(state->ControlWord);
      |   ~~~~ ~~~~~~~^~~~~~~~~~~
/Users/rudkx/src/llvm-project/libc/src/__support/FPUtil/aarch64/fenv_darwin_impl.h:281:32: error: implicit conversion loses integer precision: 'const uint64_t' (aka 'const unsigned long long') to 'uint32_t' (aka 'unsigned int') [-Werror,-Wshorten-64-to-32]
  281 | FEnv::set_status_word(state->StatusWord);
      |   ~~~~ ~~~~~~~^~~~~~~~~~
4 errors generated.
```

I configured and built like this:

```
cmake -S llvm -B assert -G Ninja -DLLVM_ENABLE_PROJECTS="clang;mlir;openmp;pstl" -DLLVM_ENABLE_ASSERTIONS=ON -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libc;libunwind;libcxxabi;libcxx;compiler-rt"

cmake --build assert
```

</pre>
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