[llvm-bugs] [Bug 42244] New: incompatible declaration

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42244

            Bug ID: 42244
           Summary: incompatible declaration
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zhonghao at pku.org.cn
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

clang is 9.0.0, and my code is as follows:

template<int...> struct A
{
  void foo();
};

struct B
{
  template<int N> friend void A<N>::A::foo();
};

clang accepts the code. gcc rejects it:

source>:7:44: error: member 'void typename A<N>::A::foo()' declared as friend
before type 'typename A<N>::A' defined

    7 |   template<int N> friend void A<N>::A::foo();

      |                                            ^

Compiler returned: 1

icc also rejects it:

<source>(7): error: declaration is incompatible with nontype "<unnamed>
A<N>::A::foo" (declared at line 7)

    template<int N> friend void A<N>::A::foo();

                                         ^

compilation aborted for <source> (code 2)

Compiler returned: 2

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