[Bug c/34156] gcc ignores the __may_alias__ attribute on a struct typedef

2010-02-04 Thread vda dot linux at googlemail dot com
--- Comment #3 from vda dot linux at googlemail dot com 2010-02-04 14:33 --- I was bitten by this whet I was trying to get rid of warning: dereferencing type-punned pointer will break strict-aliasing rules on this fairly normal networking-related code: if (cmsgptr-cmsg_level ==

[Bug c/34156] gcc ignores the __may_alias__ attribute on a struct typedef

2010-02-04 Thread rguenth at gcc dot gnu dot org
--- Comment #4 from rguenth at gcc dot gnu dot org 2010-02-04 15:38 --- The easiest way would be to expose the middle-end ref-all pointer annotation so you could do typedef struct T *my_ptr __attribute__((ref_all)). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34156

[Bug c/34156] gcc ignores the __may_alias__ attribute on a struct typedef

2007-11-19 Thread pinskia at gcc dot gnu dot org
--- Comment #1 from pinskia at gcc dot gnu dot org 2007-11-20 02:24 --- Please read the dicussion starting at: http://gcc.gnu.org/ml/gcc/2007-11/msg00213.html -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34156

[Bug c/34156] gcc ignores the __may_alias__ attribute on a struct typedef

2007-11-19 Thread acahalan at gmail dot com
--- Comment #2 from acahalan at gmail dot com 2007-11-20 05:35 --- (In reply to comment #1) Please read the dicussion starting at: http://gcc.gnu.org/ml/gcc/2007-11/msg00213.html Discussion noted. It seems like the 100% workable solution is to let the C++ compiler factor attributes