------- Comment #3 from janis at gcc dot gnu dot org  2008-09-17 17:02 -------
This is twisting my brain, but in this simplified testcase:

  __PTRDIFF_TYPE__ p;
  short q;
  void foo () { ((char *)p)++; }
  void bar () { ((char *)q)++; }

we get an error with both -m32 and-m64 for foo but not for bar:

  elm3b149% /home/janis/tools/gcc-trunk-anonsvn/bin/g++ -c -m32 z.C
  z.C: In function ‘void foo()’:
  z.C:3: error: lvalue required as increment operand
  elm3b149% /home/janis/tools/gcc-trunk-anonsvn/bin/g++ -c -m64 z.C
  z.C: In function ‘void foo()’:
  z.C:3: error: lvalue required as increment operand

although the expression "(char *)q" in bar is not an lvalue.  What am I
missing?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37561