<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [GCC compatibility] different layout for ms_struct with bit-field"
href="https://llvm.org/bugs/show_bug.cgi?id=25707">25707</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[GCC compatibility] different layout for ms_struct with bit-field
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dmitry.polukhin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat test3.c
#include <stddef.h>
#include <stdio.h>
struct __attribute__((ms_struct)) B {
char AField;
int b : 1;
char BField;
};
int main() {
printf("sizeof(struct B) = %ld\n", sizeof(struct B));
printf("offsetof(struct B, BField) = %ld\n", offsetof(struct B, BField));
printf("__alignof(struct B) = %ld\n", __alignof(struct B));
}
$ clang test3.c && ./a.out
sizeof(struct B) = 12
offsetof(struct B, BField) = 8
__alignof(struct B) = 4
$ gcc test3.c && ./a.out
sizeof(struct B) = 8
offsetof(struct B, BField) = 5
__alignof(struct B) = 4</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>