https://bugs.llvm.org/show_bug.cgi?id=42090
Bug ID: 42090
Summary: Missed -Wsign-compare as compared to GCC9
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
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.
https://godbolt.org/z/7xrWzz
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