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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang -fopenmp -ffast-math causes compile failures with gnu math.h"
href="https://llvm.org/bugs/show_bug.cgi?id=28973">28973</a>
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<th>Summary</th>
<td>clang -fopenmp -ffast-math causes compile failures with gnu math.h
</td>
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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>dan_gulotta@yahoo.com
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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>When OpenMP is enabled in Clang, the _OPENMP macro is set to 201307, indicating
support for OpenMP 4. Defining the _OPENMP macro this way will cause some
header files to try to use OpenMP 4 features not yet supported by Clang. In
particular, GNU's bits/math-vector.h will use "omp declare simd notinbranch"
when __FAST_MATH__ is defined and _OPENMP >= 201307, leading to compile errors.
Manually defining _OPENMP to be 201107 makes the problem go away.</pre>
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