http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53202
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-05-03 08:22:51 UTC --- Created attachment 27301 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27301 preprocessed source This preprocessed source was created by G++ version 4.6.3 20120306 (Red Hat 4.6.3-2) When compiled with 4.6.3 it gives: default ctor called, this=0x7fffba05109f copy ctor called, this=0x7fffba051067 move ctor called, this=0x253d010 destructor called, this=0x7fffba051067 void background_hello::operator()() called, this=0x253d010 destructor called, this=0x253d010 destructor called, this=0x7fffba05109f When the same preprocessed source is compiled with the 4.7 branch or trunk it gives: default ctor called, this=0x7fff8a2f7daf move ctor called, this=0x1d56010 destructor called, this=0x7fff8a2f7d77 void background_hello::operator()() called, this=0x1d56010 destructor called, this=0x1d56010 destructor called, this=0x7fff8a2f7daf N.B. there is only one missing constructor here, compared to two when the original source is compiled with trunk, I guess that's due to a change in <tuple> between 4.6 and 4.8, but the same preprocessed input should still produce the same result with both versions, so I think that rules out library changes being the sole cause of this bug
