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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - gcda (gcov data) writer is not multi-process-safe, impacting coverage analysis and profiling of programs that fork()"
href="http://llvm.org/bugs/show_bug.cgi?id=20986">20986</a>
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<th>Summary</th>
<td>gcda (gcov data) writer is not multi-process-safe, impacting coverage analysis and profiling of programs that fork()
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<th>Product</th>
<td>compiler-rt
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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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>compiler-rt
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>mark@chromium.org
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>llvm/projects/compiler-rt/lib/profile/GCDAProfiling.c says:
|* TODO: gcov is multi-process safe by having each exit open the existing file
|* and append to it. We'd like to achieve that and be thread-safe too.
(<a href="http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/GCDAProfiling.c?revision=215933&view=markup#l18">http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/GCDAProfiling.c?revision=215933&view=markup#l18</a>)
I believe that this is causing a problem for test coverage analysis when the
test framework implements death tests in the way that gtest (googletest) does,
either as fork()-based or fork()-exec()-based. These are described as “fast”
and “threadsafe” respectively in
<a href="https://code.google.com/p/googletest/wiki/AdvancedGuide#How_It_Works">https://code.google.com/p/googletest/wiki/AdvancedGuide#How_It_Works</a>.
Regardless, I didn’t find a bug tracking this TODO, and it seems like there
should probably be one.</pre>
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