[LLVMbugs] [Bug 6362] New: A potential bug in pragma pack

[bugzilla-daemon at llvm.org]

http://www.llvm.org/bugs/show_bug.cgi?id=6362

           Summary: A potential bug in pragma pack
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P5
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: amine48rz at gmail.com
   Estimated Hours: 0.0


Here's the testcase : 

#pragma pack(2)

typedef struct { unsigned int a; } b;

static void A(void) {
    extern void __C_ASSERT__(int [(__alignof__(((b*)0)->a) == 2)?1:-1]);
}

Clang emits an error : array size is negative
    extern void __C_ASSERT__(int [(__alignof__(((b*)0)->a) == 2)?1:-1]);
                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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