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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - no warnings for -Wtautological-compare"
href="https://bugs.llvm.org/show_bug.cgi?id=43573">43573</a>
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<th>Summary</th>
<td>no warnings for -Wtautological-compare
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</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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<tr>
<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>C
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>tangyixuan@mail.dlut.edu.cn
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>clang-10 falls to emit the warning for the following:
$ cat s.c
int main(){
int a;
int b = (0!=((-1)|((a = 1) == 1)));
return 0;
}
$ clang-10 -Wtautological-compare 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
$ gcc-9.1 -Wtautological-compare s.c
s.c:3:12: warning：bitwise comparison always evaluates to true
[-Wtautological-compare]
3 | int b = (0!=((-1)|((c = 1) == 1)));
| ^~</pre>
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