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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - no warnings with -Waddress"
href="https://bugs.llvm.org/show_bug.cgi?id=43647">43647</a>
</td>
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<th>Summary</th>
<td>no warnings with -Waddress
</td>
</tr>
<tr>
<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>
</tr>
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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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tangyixuan@mail.dlut.edu.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>clang-10 falls to emit the warning for the following:
$ cat s.c
int main()
{
int *a = (void *) 0;
int b = (&a) == ((void *) 0);
return b;
}
$ clang-10 -Weverything -pedantic s.c
clang version 10.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
49c4e58b75ecec8dce75dd13c61aaeb30e14b531)
Target: x86_64-unknown-linux-gnu
Thread model: posix
[-Waddress] is enabled by default in Clang, but do not issue the warning. When
compiled with GCC, warnings such as:
$ gcc -Wall s.c
s.c: In function ‘main’:
s.c:4:16: warning：the comparison will always evaluate as ‘false’ for the
address of ‘a’ will never be NULL [-Waddress]
4 | int b = (&a) == ((void *) 0);
| ^~</pre>
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