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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Preprocessor bug (variadic macros)"
href="https://bugs.llvm.org/show_bug.cgi?id=35617">35617</a>
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<th>Summary</th>
<td>Preprocessor bug (variadic macros)
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>5.0
</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>jkl9543@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
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<pre>#define xcombine(A,B,...) A ## B ## __VA_ARGS__
#define m(x,...) xcombine(x,__VA_ARGS__)
m(1) //CLANG should NOT bark "too few arguments".
m(1,2) //GCC/MSC/CLANG works fine.
#define ycombine(A,B) A ## B
#define n(x,...) ycombine(x,##__VA_ARGS__)
n(1) //MSC/CLANG fail to detect error: macro "ycombine" requires 2 arguments,
but only 1 given.
n(1,2) //no problem.</pre>
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