[llvm-bugs] [Bug 44531] New: clang-cl unqualified friend declaration

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44531

            Bug ID: 44531
           Summary: clang-cl unqualified friend declaration
           Product: clang
           Version: 9.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tiagomacarios at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

The code below warns on windows but compiles fine on linux.

https://godbolt.org/z/20iVGc

> type a.cpp
class S;

namespace N
{
    class SS
    {
        friend class S;
    };
}

>clang -c -std=c++17 -Weverything -v a.cpp
clang version 9.0.0 (tags/RELEASE_900/final)
Target: x86_64-pc-windows-msvc
...
a.cpp:7:22: warning: unqualified friend declaration referring to type outside
of the nearest enclosing namespace is a Microsoft extension;
      add a nested name specifier [-Wmicrosoft-unqualified-friend]
        friend class S;
                     ^
                     ::
1 warning generated.

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