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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Wrong "error: cannot jump from this indirect goto statement to one of its possible targets""
href="https://llvm.org/bugs/show_bug.cgi?id=27645">27645</a>
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<th>Summary</th>
<td>Wrong "error: cannot jump from this indirect goto statement to one of its possible targets"
</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>Linux
</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>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cherepan@mccme.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Source code:
----------------------------------------------------------------------
int main()
{
void *p = &&first;
goto *p;
first:;
int n = 1;
char a[n];
void *q = &&second;
goto *q;
second:;
}
----------------------------------------------------------------------
Results:
----------------------------------------------------------------------
$ clang -std=gnu11 test.c && ./a.out
test.c:4:3: error: cannot jump from this indirect goto statement to one of its
possible targets
goto *p;
^
test.c:14:2: note: possible target of indirect goto statement
second:;
^
test.c:9:8: note: jump bypasses initialization of variable length array
char a[n];
^
1 error generated.
----------------------------------------------------------------------
clang version: clang version 3.9.0 (trunk 268228)
The source code is safe and the clang error is wrong. OTOH my testcase is
artificial and maybe better analysis just doesn't worth the trouble.</pre>
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