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From: "reichelt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51413] New: Broken diagnostic with __builtin_offsetof
Date: Sun, 04 Dec 2011 21:57:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51413

             Bug #: 51413
           Summary: Broken diagnostic with __builtin_offsetof
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: reichelt@gcc.gnu.org


A broken diagnostic is generated for the following invalid code snippet since
GCC 4.1.2:

=============================================
struct A
{
  static void foo();
};

int i = __builtin_offsetof(A, foo[1][1]);
=============================================

bug.cc:6:36: warning: pointer to a function used in arithmetic
[-Wpointer-arith]
bug.cc:6:39: warning: pointer to a function used in arithmetic
[-Wpointer-arith]
bug.cc:6:40: error: cannot apply 'offsetof' to member function '#'indirect_ref'
not supported by dump_decl#<declaration error>'