Bug#103980: g++-3.0: copies constructors

[Jaakko Niemi <liiwi@iki.fi>]

Laurent Bonnaud <Laurent.Bonnaud@inpg.fr> writes:

> Hi,
> 
> you write that "apparently", g++ 3.0 tries a longer conversion chain
> than 2.95.  Indeed, the compiler message let us think so.  But to
> verify this, I added traces into your testcase.  The result is that
> both g++ versions use the same conversion chain (and indeed g++ 3.0
> takes much longer to compile) :
> 
> $ ./a.out 
> non const aios->aiosout
> 
> So the only problem here seems to be the compilation speed.  Perhaps
> g++ 3.0 has to take into account more copy constructors for the
> conversion chain computation than g++ 2.95 in order to comply with more
> complex new C++ rules ?

 The compile time is not a problem here, but failure building is.

 You move aiosout (const aiosout &o) ... under public:, which
effectively hides the problem. Please take look at:

http://www.mit.edu:8008/snafu.fooworld.org/sfs/116

 and related thread in the sfs mailing list arhive for 
more proper explanation. 

        -j