llvm/llvm-project
Ver no GitHub[clang] Poor diagnostic with wrong template argument type
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#121.235 aberto em 27 de dez. de 2024
clang:diagnosticsconfirmedenhancementgood first issue
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Description
Clang diagnostic for invalid bool-to-enum template parameter conversion lacks failure detail when compared to GCC, as the following C++ snippet:
enum endianness { little = 0, big };
template <endianness e>
inline void foo() {}
void bar() {
foo<false>();
}
Fails as follows on latest clang:
<source>:7:5: error: no matching function for call to 'foo'
7 | foo<false>();
| ^~~~~~~~~~
<source>:4:13: note: candidate template ignored: invalid explicitly-specified argument for template parameter 'big_endian'
4 | inline void foo() {}
GCC explicitly indicates the conversion failure instead:
<source>:4:13: note: template argument deduction/substitution failed:
<source>:7:15: error: could not convert 'false' from 'bool' to 'endianness'
7 | foo<false>();
| ~~~~~~~~~~^~
| |
| bool
Godbolt: https://godbolt.org/z/hnazTn3M7 (cc/ @shafik).