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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Analyzer fails to recognize C-style union struct initialization"
href="https://bugs.llvm.org/show_bug.cgi?id=39884">39884</a>
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<th>Summary</th>
<td>Analyzer fails to recognize C-style union struct initialization
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>7.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Static Analyzer
</td>
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<th>Assignee</th>
<td>dcoughlin@apple.com
</td>
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<th>Reporter</th>
<td>renat@idrisov.info
</td>
</tr>
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Hi All,
I run analysis on a piece of code with:
$ clang-tidy tidy-minimal.c -checks=* --
Code:
#include <stdio.h>
#include <stdlib.h>
struct a {
union {
struct {
void *b;
};
};
};
void *something();
void something_else(struct a *param);
void myfunction() {
struct a c = { .b = malloc(256) };
something_else(&c);
}
int main() {
myfunction();
}
----------------
I get:
/.../tidy-minimal.c:18:1: warning: Potential memory leak
[clang-analyzer-unix.Malloc]
}
^
/.../tidy-minimal.c:21:3: note: Calling 'myfunction'
myfunction();
^
/.../tidy-minimal.c:16:23: note: Memory is allocated
struct a c = { .b = malloc(256) };
^
/.../tidy-minimal.c:18:1: note: Potential memory leak
}
^
----------------
It looks like it is not handling struct initialization properly because if I
remove union -- it produces no warnings
The issue could be related to <a class="bz_bug_link
bz_status_NEW "
title="NEW - core.CallAndMessage false positives with anonymous unions"
href="show_bug.cgi?id=35882">https://bugs.llvm.org/show_bug.cgi?id=35882</a>
but in my case giving union a name does not resolve it.
Thanks!</pre>
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