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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - ASTMatchersTest.cpp takes too long to compile"
href="http://llvm.org/bugs/show_bug.cgi?id=20061">20061</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>ASTMatchersTest.cpp takes too long to compile
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>klimek@google.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12670" name="attach_12670" title="preprocessed file">attachment 12670</a> <a href="attachment.cgi?id=12670&action=edit" title="preprocessed file">[details]</a></span>
preprocessed file
We probably have to split this file or find a better way of doing this test, it
is a very noticeable serialization point in a parallel build:
$ time ~/inst/clang/bin/clang -c -std=c++11 ASTMatchersTest.ii -w
-Wno-invalid-constexpr
real 0m8.914s
user 0m8.566s
sys 0m0.309s
$ time /usr/bin/gcc -c -std=c++11 ASTMatchersTest.ii -w -Wno-invalid-constexpr
real 0m15.773s
user 0m15.017s
sys 0m0.689s
$ time ~/inst/clang/bin/clang -c -std=c++11 ASTMatchersTest.ii -w
-Wno-invalid-constexpr -O3
real 0m38.222s
user 0m37.706s
sys 0m0.360s
$ time /usr/bin/gcc -c -std=c++11 ASTMatchersTest.ii -w -Wno-invalid-constexpr
-O3
real 0m43.853s
user 0m43.004s
sys 0m0.674s</pre>
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