| Issue |
176136
|
| Summary |
Clang accepts duplicate maybe_unused without diagnostic
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
vrukesh
|
**What code / commands /steps will reproduce the problem?**
Compile the sample code:
_int foo([[maybe_unused, maybe_unused]] int a) {
return 1;
}
int main() {
return foo(3);
}_
**Compiler Explorer link:**
https://godbolt.org/z/67EWeqYnE
**What is the expected result?**
As per C++17 standard,
_The attribute-token maybe_unused indicates that a name or entity is possibly intentionally unused. It shall
appear at most once in each attribute-list and no attribute-argument-clause shall be present._
**What happens instead?**
GCC throws diagnostic warning. It meets C++17 standard.
Clang passes the compilation without any diagnostic warning or error. This doesnot meet C++17 standard.
To meet C++17 standard, Clang should diagnose the duplicate maybe_unused attribute with diagnostic warning or error.
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