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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - <ctype.h> doesn't handle -fpack-struct"
href="http://llvm.org/bugs/show_bug.cgi?id=22538">22538</a>
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<th>Summary</th>
<td><ctype.h> doesn't handle -fpack-struct
</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>FreeBSD
</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>Headers
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kenbrody@gmail.com
</td>
</tr>
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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>The <ctype.h> header doesn't protect itself from being included in source code
when "-fpack-struct" is being used with a non-default value. This causes the
is* macros to mis-read the required structs
This is on a 64-bit version of FreeBSD 10.0, should that make a difference.
========== istest.c
#include <stdio.h>
#include <ctype.h>
int main(int argc,char *argv[])
{
printf("isalnum('z') returns %d\n",isalnum('z'));
}
==========
When compiled with the simple:
clang -o istest istest.c
you get the expected "1" result.
However, when compiled with 2-byte packing:
clang -fpack-struct-2 -o istest istest.c
you get "0" for the output.</pre>
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