[llvm-bugs] [Bug 29142] New: clang-cl treats different extern "C" declarations as redeclarations

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29142

            Bug ID: 29142
           Summary: clang-cl treats different extern "C" declarations as
                    redeclarations
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: 6yearold at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The code

namespace acommon {

struct ErrorInfo;

extern "C" __declspec(dllexport)  const ErrorInfo * const aerror_other;

}

extern "C" {
struct AspellErrorInfo {

  const struct AspellErrorInfo * isa;

  const char * mesg;

  unsigned int num_parms;

  const char * parms[3];

};


typedef struct AspellErrorInfo AspellErrorInfo;
extern const struct AspellErrorInfo * const aerror_other;
}

int main()
{
return 0;
}

compiles with cl.exe, but fails with clang-cl.exe:

tst.cpp(25,45):  error: redeclaration of 'aerror_other' with a different type:
'const struct AspellErrorInfo *const' vs 'const acommon::ErrorInfo *const'
extern const struct AspellErrorInfo * const aerror_other;
                                            ^
tst.cpp(6,59):  note: previous declaration is here
extern "C" __declspec(dllexport)  const ErrorInfo * const aerror_other;
                                                          ^

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