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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No conversion warning for assigning 1 to a bit-field of type "int:1""
href="http://llvm.org/bugs/show_bug.cgi?id=18720">18720</a>
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<th>Summary</th>
<td>No conversion warning for assigning 1 to a bit-field of type "int:1"
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>chengniansun@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I have a bit-field "int f:1;", and Clang does not warn if I assign 1 to it,
i.e., "c.f = 1;"
$: cat bitfield-signed-char.c
#include<stdio.h>
struct C {int f:1;};
int main() {
struct C c;
c.f = 1;
printf("c.f = %d\n", c.f);
c.f = 1;
printf("c.f = %d\n", c.f);
return 0;
}
$: clang-trunk -std=c11 -Weverything bitfield-signed-char.c
bitfield-signed-char.c:2:8: warning: padding size of 'struct C' with 31 bits to
alignment boundary [-Wpadded]
struct C {int f:1;};
^
1 warning generated.
$: ./a.out
c.f = -1
c.f = -1
$</pre>
</div>
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