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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Empty macro expansion from inside another macro causes incorrect placement of expanded macro"
href="http://llvm.org/bugs/show_bug.cgi?id=18485">18485</a>
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<th>Summary</th>
<td>Empty macro expansion from inside another macro causes incorrect placement of expanded macro
</td>
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<th>Product</th>
<td>clang
</td>
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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>Windows NT
</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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>eremeev@viva64.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Empty macro expansion from inside another macro causes incorrect placement of
expanded macro.
Consider the example:
#define B
#define A(type) B unsigned type
/*
empty lines
...
...
...
...*/
A(int) foo()
{}
The clang preprocessor (-E option) will output the following:
#line 1 "D:/home/paul/sample.c"
#line 1 "<built-in>"
#line 1 "<built-in>"
#line 156 "<built-in>"
#line 1 "<command line>"
#line 1 "<built-in>"
#line 1 "D:/home/paul/sample.c" unsigned int
#line 10 "D:/home/paul/sample.c"
foo()
{}
Take a note, that the return type of the foo function is placed before #line
10, meaning that it is placed before the whitespace, thus incorrectly pointing
the start position of the foo to line 1 instead of line 10.</pre>
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</p>
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