Switching to C++ by default in 4.8

[Diego Novillo <dnovillo at google dot com>]

We would like to start the process to make GCC 4.8 build in C++ mode by 
default.

The mechanics of the change are simple enough.  I volunteer to test 
changing the default on all primary targets (assuming I can get them 
from the GCC build farm).

Concurrently with this, Lawrence and Ian are working on the C++ coding 
guidelines.  The draft is stored at 
http://gcc.gnu.org/wiki/CppConventions.  They will be sending an update 
in the next few days.  The idea is to hash out the details on the wiki 
and then produce a patch to http://gcc.gnu.org/codingconventions.html.

While these two changes are independent, it probably makes sense to 
first have agreement on an initial set of coding conventions before we 
switch the default.

I expect that coding conventions will evolve quite a bit in the next few 
months, so we should do the switch after the first patch to 
codingconventions.html is approved and installed.  A reasonable initial 
version of this should cover the core language features that allow 
implementing basic conversions (for instance, those that would allow 
re-implementing vec.h).

I would like to avoid discussions to drag on indefinitely.  But, given 
the magnitude of these changes, I suppose that it may take a few days to 
hash it out.  Therefore, I propose that:

- For the coding conventions, we have the explicit approval of at least 
4 global reviewers.
- For the build changes, approval from a build maintainer should be enough.


Thanks.  Diego.