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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - undef is printed on the wrong line by -E -CC -dD with comment in macro"
href="http://bugs.llvm.org/show_bug.cgi?id=32631">32631</a>
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<th>Summary</th>
<td>undef is printed on the wrong line by -E -CC -dD with comment in macro
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>4.0
</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>
</tr>
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<th>Severity</th>
<td>enhancement
</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
</td>
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<th>Reporter</th>
<td>jonathanmueller.dev@gmail.com
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</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>If you run `clang++ -E -CC -dD` on this file:
```
#define FOO /*a
b
c*/
FOO
#undef FOO
```
The output is:
```
predefine macros here...
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "file.cpp" 2
#define FOO /*a
b
c*/
/*a
b
c*/#undef FOO
# 7 "file.cpp"
```
This is incorrect, the `#undef` is on the same line as the expansion but should
be on its own line.
The error still happens when the macro contains additional code, but doesn't
happen anymore if it contains a comment with a line number other than three.
I know that this is *really* obscure, but I parse the output of `clang++ -E`
and can't detect the `#undef` if it is on the same line.</pre>
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</p>
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