http://llvm.org/bugs/show_bug.cgi?id=12708

             Bug #: 12708
           Summary: In microsoft, support __fastcall on functions without
                    prototype
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected]
    Classification: Unclassified


handleFunctionTypeAttr in SemaType.cpp


C:\src\chrome\src>type test.c
void __fastcall f() {
}

C:\src\chrome\src>cl /c test.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.30319.01 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

test.c

C:\src\chrome\src>..\..\llvm-build\bin\Release\clang.exe -c test.c
test.c:1:6: error: function with no prototype cannot use fastcall calling
convention
void __fastcall f() {
     ^
1 error generated.


This is used in lzma_sdk if _MSC_VER is defined.

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