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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - use of MAP_ANONYMOUS blocks build on OS X 10.10 and earlier"
href="https://bugs.llvm.org/show_bug.cgi?id=38958">38958</a>
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<th>Summary</th>
<td>use of MAP_ANONYMOUS blocks build on OS X 10.10 and earlier
</td>
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<th>Product</th>
<td>compiler-rt
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Macintosh
</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>xray
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>ken.cunningham.webuse@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20884" name="attach_20884" title="instances of MAP_ANONYMOUS in compiler-rt/* as of 20180915">attachment 20884</a> <a href="attachment.cgi?id=20884&action=edit" title="instances of MAP_ANONYMOUS in compiler-rt/* as of 20180915">[details]</a></span>
instances of MAP_ANONYMOUS in compiler-rt/* as of 20180915
A number of uses of MAP_ANONYMOUS have crept into the compiler-rt codebase, and
causes build failures on systems that only define MAP_ANON and not
MAP_ANONYMOUS (including macOS 10.10 and earlier).
Previously <<a href="https://reviews.llvm.org/D15180">https://reviews.llvm.org/D15180</a>> it was decided to use MAP_ANON
instead for this reason.
This could possibly be fixed in compiler-rt/CMakeLists.txt with a simple
blanket change:
IF (APPLE)
add_definitions(-DMAP_ANONYMOUS=MAP_ANON)
ENDIF
Or more elegantly the define could be tested for and added only if missing.
Or the instances of MAP_ANONYMOUS in the compiler-rt codebase could be
individually changed to MAP_ANON.
(I note tsan has done it's own version of managing this mapping with
TSAN_MAP_ANON in compiler-rt/test/tsan/ignore_lib5.cc)
A present list of involved files is attached.</pre>
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