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      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Unable to use __builtin_cpu_supports with compiler-rt"
   href="https://bugs.llvm.org/show_bug.cgi?id=41230">41230</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Unable to use __builtin_cpu_supports with compiler-rt
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>compiler-rt
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>8.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>compiler-rt
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>chris@detrino.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>When using the toolchain provided by
<a href="http://releases.llvm.org/7.0.1/clang+llvm-7.0.1-x86_64-linux-gnu-ubuntu-18.04.tar.xz">http://releases.llvm.org/7.0.1/clang+llvm-7.0.1-x86_64-linux-gnu-ubuntu-18.04.tar.xz</a>


Consider the following file test.cc:
<span class="quote">>bool Foo() {
>  return __builtin_cpu_supports("avx2");
>}</span >

The following compiles sucessfully:
<span class="quote">>$ bin/clang++ -shared -o test.so test.cc -fPIC</span >

And the following leads to an error:
<span class="quote">>$ bin/clang++ -shared -o test.so test.cc -fPIC -rtlib=compiler-rt
>/usr/bin/ld: /tmp/test-46520d.o: relocation R_X86_64_PC32 against symbol `__cpu_model' can not be used when making a shared object; recompile with -fPIC
>/usr/bin/ld: final link failed: Bad value
>clang-8: error: linker command failed with exit code 1 (use -v to see invocation)</span ></pre>
        </div>
      </p>


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