<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </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 --- - error in backend: SSE register return with SSE disabled"
   href="https://llvm.org/bugs/show_bug.cgi?id=23203">23203</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>error in backend: SSE register return with SSE disabled
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>3.6
          </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>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>blastrock@free.fr
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=14190" name="attach_14190" title="The preprocessed file">attachment 14190</a> <a href="attachment.cgi?id=14190&action=edit" title="The preprocessed file">[details]</a></span>
The preprocessed file

I'm trying to compile some code (in this case its a modified version of
string.cpp from libcxx) with SSE disabled (-mno-sse), but this gives me the
following error:

    fatal error: error in backend: SSE register return with SSE disabled
    clang-3.6: error: clang frontend command failed with exit code 70 (use -v
to see invocation)
    clang version 3.6.1 
    Target: x86_64-unknown-linux-gnu
    Thread model: posix
    clang-3.6: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
    clang-3.6: note: diagnostic msg: 
    ********************

    PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
    Preprocessed source(s) and associated run script(s) are located at:
    clang-3.6: note: diagnostic msg: /tmp/string-117432.cpp
    clang-3.6: note: diagnostic msg: /tmp/string-117432.sh
    clang-3.6: note: diagnostic msg: 

    ********************

I'm attaching the preprocessed cpp file (which is different from the one
mentioned above since it didn't compile, complaining about using ::int8_t).

I reduced the command line to:
clang-3.6 "-cc1" "-triple" "x86_64-unknown-linux-gnu" "-emit-obj" "-target-cpu"
"x86-64" "-target-feature" "-sse" "-nobuiltininc" "-O0" "-std=c++0x" "-x" "c++"
"string.cpp"</pre>
        </div>
      </p>
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