| Issue |
208987
|
| Summary |
[Clang] `-Wliteral-conversion` only warns for conversion from floating-point literals
|
| Labels |
clang:diagnostics
|
| Assignees |
|
| Reporter |
frederick-vs-ja
|
From the [documentation](https://clang.llvm.org/docs/DiagnosticsReference.html#wliteral-conversion), one may expect that the warning also covers non-floating-point literals. But currently the warning is restricted to conversion from floating-point literals.
Example ([Godbolt link](https://godbolt.org/z/fTr49cK9x)):
```C++
void test() {
(void)('*' || true); // no warning
(void)(u8'*' || true); // no warning
(void)(u'*' || true); // no warning
(void)(U'*' || true); // no warning
(void)(L'*' || true); // no warning
(void)("" || true); // no warning
(void)(u8"" || true); // no warning
(void)(u"" || true); // no warning
(void)(U"" || true); // no warning
(void)(L"" || true); // no warning
(void)(42 || true); // no warning
(void)(42U || true); // no warning
(void)(42L || true); // no warning
(void)(42UL || true); // no warning
(void)(42LL || true); // no warning
(void)(42UL || true); // no warning
(void)(42.0F16 || true); // warning
(void)(42.0F || true); // warning
(void)(42.0 || true); // warning
(void)(42.0L || true); // warning
}
```
This seems to be by design.
https://github.com/llvm/llvm-project/blob/9dffcd2752af16a09eeb4131f90a1a0fe2b76a1f/clang/include/clang/Basic/DiagnosticSemaKinds.td#L4598-L4603
Do we want to extend the coverage of `-Wliteral-conversion` or clarify that it's restricted to FP literals?
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