https://bugs.llvm.org/show_bug.cgi?id=50648
Bug ID: 50648
Summary: Clang should warn on what appear to be buggy friend
declarations
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Consider code like this:
https://gcc.godbolt.org/z/EEe8xWrzj
class Bar;
namespace foo {
class Foo {
friend class Bar; // forward declares ::foo::Bar
Foo();
int x;
};
}
class Bar {
Bar() {}
foo::Foo m; // error
};
It seems like clang should be able to warn and say, "hey, you probably say
`friend class ::Bar;`".
We accept this code in MSVC mode with a warning, so it shouldn't be too hard to
detect when we would do that and provide a warning in that case:
https://reviews.llvm.org/D4443
See `bool FriendSawTagOutsideEnclosingNamespace` in SemaDecl.cpp.
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