compnerd wrote:
> @compnerd This code snippet does not compile and I could not massage it into
> a form where it would, so I suspect this case is not legal C++.
Sorry, this should give you the separated LinkageSpecDecl that changes:
```c++
namespace {
extern "C++" {
extern "C" {
struct S {
__attribute__((__used__)) static void f() { }
};
}
}
}
```
```
|-NamespaceDecl 0x8c6d29a18 <reduced.cc:1:1, line:9:1> line:1:11
| `-LinkageSpecDecl 0x8c6d29b00 <line:2:1, line:8:1> line:2:8 C++
| `-LinkageSpecDecl 0x8c6d29b70 <line:3:1, line:7:1> line:3:8 C
| `-CXXRecordDecl 0x8c6d29bc0 <line:4:3, line:6:3> line:4:10 struct S
definition
| |-DefinitionData pass_in_registers empty aggregate standard_layout
trivially_copyable pod trivial literal has_constexpr_non_copy_move_ctor
can_const_default_init
| | |-DefaultConstructor exists trivial constexpr needs_implicit
defaulted_is_constexpr
| | |-CopyConstructor simple trivial has_const_param needs_implicit
implicit_has_const_param
| | |-MoveConstructor exists simple trivial needs_implicit
| | |-CopyAssignment simple trivial has_const_param needs_implicit
implicit_has_const_param
| | |-MoveAssignment exists simple trivial needs_implicit
| | `-Destructor simple irrelevant trivial needs_implicit
| |-CXXRecordDecl 0x8c6d29cd8 <col:3, col:10> col:10 implicit struct S
| `-CXXMethodDecl 0x8c6d29df0 <line:5:5, col:49> col:43 used f 'void ()'
static implicit-inline
| |-CompoundStmt 0x8c6d29f08 <col:47, col:49>
| `-UsedAttr 0x8c6d29e98 <col:20>
```
The parent of `f` is not `LinkageSpecDecl` but `CXXRecordDecl`.
https://github.com/llvm/llvm-project/pull/176792
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