http://llvm.org/bugs/show_bug.cgi?id=8669
Summary: friend decls get put in the wrong DeclContext in
certain situations
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Consider the following code:
---
1 struct B {
2 template<class T> class C;
3 template<class T> friend class C;
4 //friend class C<float>;
5 };
6
7 template<class T> class C { };
8
9 C<int>* foo;
---
The declaration at line 7 and the declarations and line 2 and 3 are put in
separate DeclContexts (as far as I can tell). To see this, when looking at the
CXXRecord for C<int> on line 9, and looking at the redecls (via
redecl_begin()/end()), the only redecl it shows is for line 7.
However, if I uncomment line 4, the situation changes. Now if I look at the
redecls for C<float> on line 4, I see line 2, line 3, and line 7. All 3 of
these have the same DeclContext (that is, record_decl->getParent() produces the
same output in each case), which is the DeclContext for this translation unit.
Likewise, if I look at the redecls for C<int> on line 9, I see all three decls,
on lines 2, 3, and 7. They still all have the same DeclContext. :-)
I would not expect uncommenting line 4 to change whether lines 2 and 3 are
redecls of line 7 or not. Nor would I expect, in any case, that the decls on
line 2 and 3 should be in the global (translation-unit) DeclContext, rather
than a DeclContext for class B.
It seems to me that the behavior when line 4 is commented is correct, but the
behavior when it is uncommented is incorrect, and clang is conflating two
DeclContexts that it shouldn't be.
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