[LLVMbugs] [Bug 20050] New: Function macro expansion with return cast problem

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20050

            Bug ID: 20050
           Summary: Function macro expansion with return cast problem
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: paul.tankard at sumo-digital.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Possibly Windows only (don't have different machine to test)

clang version 3.4.1 (207424)
Target: i686-pc-mingw32
Thread model: posix

In visual studio, cpp file is including interlockedapi.h which has the
following definition.

#define InterlockedExchangePointer(Target, Value) \
    (PVOID)InterlockedExchange((PLONG)(Target), ((LONG)(LONG_PTR)(Value)))

When invoked in code via

return ::InterlockedExchangePointer(Dest, Exchange);

The following is produced.

error : unexpected parenthesis after '::'
1>                  return ::InterlockedExchangePointer(Dest, Exchange);
1>                           ^
1>  C:\Program Files (x86)\Windows Kits\8.0\include\um\interlockedapi.h(76,4) :
 note: expanded from macro 'InterlockedExchangePointer'
1>      (PVOID)InterlockedExchange((PLONG)(Target), ((LONG)(LONG_PTR)(Value)))

error : expected '(' for function-style cast or type construction
1>                  return ::InterlockedExchangePointer(Dest, Exchange);
1>                         ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1>  C:\Program Files (x86)\Windows Kits\8.0\include\um\interlockedapi.h(76,11)
:  note: expanded from macro 'InterlockedExchangePointer'
1>      (PVOID)InterlockedExchange((PLONG)(Target), ((LONG)(LONG_PTR)(Value)))

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