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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Access to uninitialized volatile stack variable generates warning"
href="https://bugs.llvm.org/show_bug.cgi?id=50645">50645</a>
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<th>Summary</th>
<td>Access to uninitialized volatile stack variable generates warning
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>12.0
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<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
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<th>Reporter</th>
<td>ilya.v.gladyshev@gmail.com
</td>
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<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Running 'clang-check -analyze' on this simplified example:
#include <stdbool.h>
bool test(void)
{
volatile int var;
return var != 0;
}
gives me:
sample.c:6:14: warning: The left operand of '!=' is a garbage value
[core.UndefinedBinaryOperatorResult]
To me this looks like a false positive. var is declared as volatile and is
expected to be initialized externally. I have only encountered this problem
with stack variables.</pre>
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