[LLVMbugs] [Bug 9471] New: Doesn't allow incomplete type in member access

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9471

           Summary: Doesn't allow incomplete type in member access
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: schaub.johannes at googlemail.com
                CC: llvmbugs at cs.uiuc.edu


Clang does not conform to the C Standard, it appears (GCC doesn't either):

struct A {
  int a;
  int x : (sizeof ((struct A*)0)->a * 8);
};

C doesn't forbid the left operand to be a pointer to incomplete type. The only
requirement it has is that it's a pointer to a structure type, and that the
right operand shall name a member of that structure. Both conditions are
satisfied (C99: 6.5.2.3p2 and 6.2.1p7).

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