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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Macros with block extension in emmintrin.h generate warnings with -Wshadow"
   href="http://llvm.org/bugs/show_bug.cgi?id=17247">17247</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Macros with block extension in emmintrin.h generate warnings with -Wshadow
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.2
          </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>loufoque@gmail.com
          </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=11201" name="attach_11201" title="demonstrates warning with emmintrin.h, compile with -Wshadow, can only be build on a target with SSE2">attachment 11201</a> <a href="attachment.cgi?id=11201&action=edit" title="demonstrates warning with emmintrin.h, compile with -Wshadow, can only be build on a target with SSE2">[details]</a></span>
demonstrates warning with emmintrin.h, compile with -Wshadow, can only be build
on a target with SSE2

The attached code generates warnings when compiled with -Wshadow because of
macro definitions like this:

#define _mm_srli_si128(a, count) __extension__ ({ \
  __m128i __a = (a); \
  (__m128i)__builtin_ia32_psrldqi128(__a, (count)*8); })

This sort of code can lead to -Wshadow warnings on __a when several macros like
this are called in a nested context, like the attached code.

Either the block extension needs to be modified to not emit -Wshadow warnings,
or the emmintrin.h file needs to locally disable that warning.</pre>
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