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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Failure to expand macro in pragma pack for MS compatibility"
href="http://llvm.org/bugs/show_bug.cgi?id=18576">18576</a>
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<th>Summary</th>
<td>Failure to expand macro in pragma pack for MS compatibility
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kumquats.a.pair@gmail.com
</td>
</tr>
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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>MSVC uses directives that look like:
#pragma push(pack,_CRT_PACKING)
When requesting preprocessed output specified on the command-line to clang-cl
("/P"), the output does not expand _CRT_PACKING.
Reproduction steps:
1. Create a file with #include <windows.h>
2. clang-cl /P <filename>
3. Observe results in <filename>.i by searching for #pragma
pack(push,_CRT_PACKING)
Expected Results:
- #pragma pack(push,_CRT_PACKING) should not be found and it should be #pragma
pack(push,8)
Other notes:
- This was observed by trying to compile a file using pre-processed source
output, so a good test case might be to #include <windows.h>, preprocess, then
try to compile the preprocessed file. If successful, it's fixed.</pre>
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