https://bugs.llvm.org/show_bug.cgi?id=42125
Bug ID: 42125
Summary: Cannot use alias template in friend declaration
Product: clang
Version: 8.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Hi,
trying to use an alias template in a friend declaration fails with "error:
redefinition of 'XYZ' as different kind of symbol".
This piece of code fails to compile on clang-8:
~~~
template<typename T>
class ActualStuff {};
template <typename B>
class Other {
public:
template<typename T>
using Stuff = ActualStuff<T>;
#if 1
// this fails with:
// error: redefinition of 'Stuff' as different kind of symbol
template<typename>
friend class Stuff;
#else
// this works
template<typename>
friend class ActualStuff;
#endif
};
~~~
And the only way I found to make it work (as shown in the example) is to bypass
the alias.
As a side note, gcc accepts the code in the example.
Cheers
Marco
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