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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Invalid C accepted: flexible array member in struct with only unnamed member"
href="https://llvm.org/bugs/show_bug.cgi?id=28407">28407</a>
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<th>Summary</th>
<td>Invalid C accepted: flexible array member in struct with only unnamed member
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ch3root@openwall.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>A flexible array member is only permitted in a struct when the struct contains
another _named_ member:
C11, 6.7.2.1p3: "A structure or union shall not contain a member with
incomplete or function type [...], except that the last member of a structure
with more than one named member may have incomplete array type"
This is a constraint violation and must be diagnosed.
Source code:
----------------------------------------------------------------------
int main()
{
struct s {
int :1;
int a[];
};
}
----------------------------------------------------------------------
Results:
----------------------------------------------------------------------
$ clang -std=c11 -Weverything -O3 test.c && ./a.out
----------------------------------------------------------------------
clang version: clang version 3.9.0 (trunk 271312)</pre>
</div>
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