[LLVMbugs] [Bug 12648] New: clang should support __builtin_alignof on types in microsoft mode

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12648

             Bug #: 12648
           Summary: clang should support __builtin_alignof on types in
                    microsoft mode
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nicolasweber at gmx.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Compiling a file that includes mstcpip.h with clang results in this compile
error:

C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\mstcpip.h:575:35:
error: unexpected type name 'IN_ADDR':
      expected expression
    if (!INET_IS_ALIGNED(Address, IN_ADDR)) {
                                  ^
C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\include\mstcpip.h:542:46:
note: expanded from macro
      'INET_IS_ALIGNED'
   (((ULONG_PTR)Pointer & (__builtin_alignof(Type)-1)) == 0)
                                             ^


A smaller version of this is:

typedef struct a {} A;

void f() {
  if (__builtin_alignof(A))
    ;
}

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