<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/54673>54673</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            On Linux, build fails with "Fatal error: bad defsym; format is --defsym name=value"
        </td>
    </tr>

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

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

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

<pre>
    This is Fedora 35, x86_64, `/usr/bin/as` is from binutils-2.37-10.fc35.x86_64
Full message:

[4/3449] Building ASM object lib/Support/BLAKE3/CMakeFiles/LLVMSupportBlake3.dir/blake3_avx512_x86-64_unix.S.o
FAILED: lib/Support/BLAKE3/CMakeFiles/LLVMSupportBlake3.dir/blake3_avx512_x86-64_unix.S.o 
/usr/bin/as --defsym GTEST_HAS_RTTI=0 --defsym _GNU_SOURCE --defsym __STDC_CONSTANT_MACROS --defsym __STDC_FORMAT_MACROS --defsym __STDC_LIMIT_MACROS -I/home/vonbrand/tmp/LLVM/llvm-project/build/lib/Support/BLAKE3 -I/home/vonbrand/tmp/LLVM/llvm-project/llvm/lib/Support/BLAKE3 -I/home/vonbrand/tmp/LLVM/llvm-project/build/include -I/home/vonbrand/tmp/LLVM/llvm-project/llvm/include -fPIC -mavx512vl --MD lib/Support/BLAKE3/CMakeFiles/LLVMSupportBlake3.dir/blake3_avx512_x86-64_unix.S.o.d -o lib/Support/BLAKE3/CMakeFiles/LLVMSupportBlake3.dir/blake3_avx512_x86-64_unix.S.o -c /home/vonbrand/tmp/LLVM/llvm-project/llvm/lib/Support/BLAKE3/blake3_avx512_x86-64_unix.S
Assembler messages:
Fatal error: bad defsym; format is --defsym name=value
</pre>
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