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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missed -Wsign-compare as compared to GCC9"
href="https://bugs.llvm.org/show_bug.cgi?id=42090">42090</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missed -Wsign-compare as compared to GCC9
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lebedev.ri@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Manually reduced:
#include <cstdint>
struct S {
int a;
constexpr S();
explicit constexpr S(int a_) : a(a_) {}
};
constexpr S b = S(12);
template <const S& e>
bool c(unsigned int d) {
return d >= e.a;
}
bool test(unsigned int d);
bool test(unsigned int d) {
return c<b>(d);
}
GCC diagnoses:
<source>: In instantiation of 'bool c(unsigned int) [with const S& e = b]':
<source>:19:18: required from here
<source>:14:12: warning: comparison of integer expressions of different
signedness: 'unsigned int' and 'const int' [-Wsign-compare]
14 | return d >= e.a;
| ~~^~~~~~
Compiler returned: 0
clang doesn't.
<a href="https://godbolt.org/z/7xrWzz">https://godbolt.org/z/7xrWzz</a></pre>
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</p>
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