================
@@ -4084,6 +4084,19 @@ bool Sema::MergeFunctionDecl(FunctionDecl *New,
NamedDecl *&OldD, Scope *S,
diag::note_carries_dependency_missing_first_decl) << 0/*Function*/;
}
+ // SYCL spec 2020
+ // The first declaration of a function with external linkage must
+ // specify sycl_external attribute.
+ // Subsequent declarations may optionally specify this attribute.
----------------
tahonermann wrote:
It is helpful to quote the specification verbatim so that the intent is
understood from the quoted context in the event that the specification changes.
```suggestion
// SYCL 2020 section 5.10.1, "SYCL functions and member functions linkage":
// When a function is declared with SYCL_EXTERNAL, that macro must be
// used on the first declaration of that function in the translation unit.
// Redeclarations of the function in the same translation unit may
// optionally use SYCL_EXTERNAL, but this is not required.
```
https://github.com/llvm/llvm-project/pull/140282
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