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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compiling a math-heavy file that uses Eigen with the '-O3 -ffast-math' causes an infinite hang"
href="http://bugs.llvm.org/show_bug.cgi?id=32514">32514</a>
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<th>Summary</th>
<td>Compiling a math-heavy file that uses Eigen with the '-O3 -ffast-math' causes an infinite hang
</td>
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<th>Product</th>
<td>compiler-rt
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>MacOS X
</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>compiler-rt
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rsanchez.saez@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=18215" name="attach_18215" title="clang hang example">attachment 18215</a> <a href="attachment.cgi?id=18215&action=edit" title="clang hang example">[details]</a></span>
clang hang example
Compiling a math-heavy file that uses Eigen with the '-O3 -ffast-math' makes
the clang compiler to hang indefinitely.
The attached file shows the problem. It is a rework of:
<a href="https://github.com/sweeneychris/TheiaSfM/blob/98d1b2c07f836a6f90046ef5e60edea4be25a94b/src/theia/sfm/pose/perspective_three_point.cc#L184">https://github.com/sweeneychris/TheiaSfM/blob/98d1b2c07f836a6f90046ef5e60edea4be25a94b/src/theia/sfm/pose/perspective_three_point.cc#L184</a>
to be self-compilable. It only depends on eigen3, you can install it through
MacPorts: sudo port install eigen3.
Compile the file through
clang -O3 -ffast-math -c PnP.cpp -I/opt/local/include/eigen3
and observe clang to hang indefinitely.
Compilation using
clang -O3 -c PnP.cpp -I/opt/local/include/eigen3
succeeds.
--$ clang --version
Apple LLVM version 8.1.0 (clang-802.0.38)
Target: x86_64-apple-darwin16.5.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin</pre>
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