[Bug c++/13484] Addition of -fenable-msvc-relaxations option

["gdr at integrable-solutions dot net" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From gdr at integrable-solutions dot net  2003-12-24 21:50 -------
Subject: Re:  Addition of -fenable-msvc-relaxations option

"s_gccbugzilla at nedprod dot com" <gcc-bugzilla@gcc.gnu.org> writes:

| As I mentioned before, it's done in MSVC using a non const reference
| copy constructor.

But, that is a clear transmutation of the standard C++ semantics; it
is not one which you can play with, will-nilly. But, again, this is
not the first time MSVC is transmuting standard C++ semantics.  Not
just because they happen to do it means that GCC should do it.  We all
are able to conceived of standard C++ semantics transmutation.

We did experiment in the past along those lines of thoughts where a
cast that produces an rvalue could be treated as a modifiable lvalue.
The net effect  was hard-to-find bugs, miscompilations and other
unpleasant maintainance marre.  It is not a road I would recommend to
take again.

If you do really want that behaviour, take it to the C++ standards
committee, have them come up with an agreed-upon behaviour and syntax,
then come here again for lobbying its implementation.

-- Gaby


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13484