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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - autoconf unconditionally defines _GNU_SOURCE"
href="http://llvm.org/bugs/show_bug.cgi?id=20865">20865</a>
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<th>Summary</th>
<td>autoconf unconditionally defines _GNU_SOURCE
</td>
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<th>Product</th>
<td>Build scripts
</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>OpenBSD
</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
</td>
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<th>Component</th>
<td>autoconf
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jsg@openbsd.org
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>When built via autoconf LLVM unconditionally defines _GNU_SOURCE, this is not
the case when built via cmake. When built via cmake LLVM first checks if the
host is using glibc before adding the define.
This becomes a problem when llvm-config --cflags includes _GNU_SOURCE and
projects like Mesa assume _GNU_SOURCE means the system is using glibc.</pre>
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