:ADDPATCH c++:

This patch continues the effort to fix PR7651 [1].

A new option -Wenum-promotion takes over the warning for an enumerator
and a non-enumerator appearing in a conditional expression. The new
option is enabled by -Wextra, so we keep the current behaviour but add
the ability to enable/disable this individual warning.

Notice that there is an unnamed and unconditional warning about
different enumeration types used in conditional expression (see
cp/call.c in the patch). That warning is untouched. This patch only
gives a name to the warning that is enabled by Wextra.

Bootstrapped and regression tested with --enable-languages=all on
i686-pc-linux-gnu.

OK for mainline?

[1] http://gcc.gnu.org/ml/gcc-patches/2006-12/msg01103.html

2007-01-07  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

  PR middle-end/7651
   * c.opt (Wenum-promotion): New.
   * doc/invoke.texi (Wenum-promotion): Document it.
   (Wextra): Enabled by -Wextra.
   (C++ Language Options): Add it.
   * c-opts.c (c_common_post_options): Enabled by -Wextra.

cp/
2007-01-07  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

  PR middle-end/7651
  * call.c (build_conditional_expr): Replace Wextra with Wenum-promotion.

testsuite/
2007-01-07  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

  PR middle-end/7651
  * g++.old-deja/g++.other/cond5.C: Move enumerators testcases to...
  * g++.dg/warn/Wenum-promotion.C: ... here. New.
  * g++.dg/warn/Wenum-promotion-no.C: ... here. New.
  * g++.dg/warn/Wenum-promotion-Wextra.C: ... here. New.