[Bug libstdc++/1773] __cplusplus defined to 1, should be 199711L

["paolo.carlini at oracle dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=1773

--- Comment #110 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-08-04 15:29:58 UTC ---
> Yes. There are independent pieces:
> *fixincludes
> *libstdc++
> *mangling
> 
> and libcpp is the big red button that can only be pressed at the end. None of
> the changes should have any noticable effect as long as we haven't pressed the
> red button.

This is very, very good, thanks.

> > If I understand correctly it's
> > something which we are going to need for C++11 anyway, right?
> 
> Ah, no. It is something we only need if we want to keep binary compatibility
> between __cplusplus=1 and __cplusplus=199711L binaries on Solaris. As soon as
> we break the ABI (libstdc++-v7?), it should be reverted as useless.

I think we really need some feedback from Rainer, then. Sorry, but it's the
first time I see the mangling machinery at issue only for a specific target. At
some point we'll have to involve the front-end people anyway, because the code
lives in cp/.

> About demangling, I don't know if we wan't to change it (and it would have to
> be Solaris-only). std::tm will be printed as tm, but that doesn't seem so
> bad...

Ok.

> PS: wasn't there a discussion some time ago about adding macros like
> __SunOS_5_10 (name taken from sunpro) so we can detect the Solaris version?

Rainer?