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<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>
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<th>Summary</th>
<td>Macros with block extension in emmintrin.h generate warnings with -Wshadow
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.2
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>loufoque@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<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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