[llvm-bugs] [Bug 25644] New: clang-cl rejects code that Visual C++ accepts

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25644

            Bug ID: 25644
           Summary: clang-cl rejects code that Visual C++ accepts
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: yaron.keren at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The code comes from boost typeof:


template <typename ID, typename T = int>
struct msvc_extract_type;

template <typename ID>
struct msvc_extract_type<ID, int> {
  template <bool> struct id2type_impl;
};

template <typename ID, typename T>
struct msvc_extract_type
    : msvc_extract_type<ID, int> {
  template <>
  struct id2type_impl<true> // VC8.0 specific bugfeature
  {};
};


clang errors while Visual C++ 2013 (from the comment, all the way from VC 8...)
accepts it, so it should be a warning instead of error when Microsoft
extensions are enabled.

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