------- Comment #4 from jwakely dot gcc at gmail dot com 2009-07-06 17:34 ------- See 8.5 [dcl.init] paragraph 12
The initialization that occurs in argument passing, function return, throwing an exception (15.1), handling an exception (15.3), and brace-enclosed initializer lists (8.5.1) is called copy-initialization and is equivalent to the form T x = a; and 12.8 [class.copy] paragraphs 14 and 15 A program is ill-formed if the copy constructor or the copy assignment operator for an object is implicitly used and the special member function is not accessible ... When certain criteria are met, an implementation is allowed to omit the copy construction of a class object, even if the copy constructor and/or destructor for the object have side effects. Your code is invalid, this is not a bug in GCC. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40655
