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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - missing warning for uninitialized struct member"
href="https://bugs.llvm.org/show_bug.cgi?id=45734">45734</a>
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<th>Summary</th>
<td>missing warning for uninitialized struct member
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>arnd@linaro.org
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>Test-building linux kernels, I found new bugs with gcc-10 that neither older
gcc versions nor clang report. See this example at <a href="https://godbolt.org/z/pYDWPx">https://godbolt.org/z/pYDWPx</a>
struct s {
int a; // always initialized
int b; // partially initialized, gcc-10 warns
int c; // not initialized, no warning
};
void f(void *p, int flag)
{
struct s s;
s.a = 0;
if (flag)
s.b |= 1;
else
s.b &= ~1;
__builtin_memcpy(p, &s, sizeof(s));
}
Ideally there would be a warning for both s.b and s.c, but clang currently
warns for neither struct member.</pre>
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