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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Bad diagnostic when using -Wunused-macros and building .S files"
href="https://llvm.org/bugs/show_bug.cgi?id=25546">25546</a>
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<th>Summary</th>
<td>Bad diagnostic when using -Wunused-macros and building .S files
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.7
</td>
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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>eyal.lotem@gmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>If you build even the empty.S file:
echo > /tmp/empty.S
clang -Wunused-macros -c /tmp/empty.S
You get a bad "unused macro" diagnostics on all the built-in macros:
<built-in>:1:9: warning: macro is not used [-Wunused-macros]
#define __llvm__ 1
^
<built-in>:2:9: warning: macro is not used [-Wunused-macros]
#define __clang__ 1
^
...</pre>
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