compiler.mk/gcc.mk: Add support for USE_LANGUAGES+= ada

All recent packages featuring Ada code have a hard dependency on the
lang/gnat-aux compiler package.  The valid values for USE_LANGUAGES
are c, c99, c++, fortran, fortran77, java, objc, so specifying a
specific compiler was necessary up into now.

One problem with lang/gnat-aux is that it is installed at ${LOCALBASE}
where the lang/gccXX compilers are installed at ${LOCALBASE}/gccXX.
The latter compilers have no possibility of sharing conflicting files
unlike lang/gnat-aux.  Rather than fundamentally update the GCC 4.6-based
lang/gnat-aux to avoid these conflicts, a new Ada-capable compiler
based on GCC 4.7 was created with the intent of being supported by
mk/compiler.mk and mk/compiler/gcc.mk.

The Ada packages will be effectively migrated from lang/gnat-aux to the
new lang/gcc-aux compiler, but lang/gcc-aux will remain as a standalone
package as it is the only GCC 4.6-based compiler that builds on
DragonFly and serves it as a world and kernel compile option.

In addition to the current language wrappers, lang/gcc-aux adds
wrappers for "ada" (unique to gcc-aux, hardlinked to gcc driver),
and the gnat, gnatmake, gnatbind, gnatlink, gnatchop, gnatprep,
and gnatls programs.  Supporting all of these allows the wrapper
system to be used with Ada packages; currently wrappers are mostly
disabled on them.

The lang/gcc47 implicitly adds support for the "objc-c++" language by
adding it to the USE_LANGUAGES list, but it wasn't really supported.
An attempt was made to better support objc-c++, but this new enumeration
probably still needs work or needs to be removed completely.

Logic for Ada support:
1) All lang/gccXX compilers have version numbers ranging from 2.8.1 to 9.
2) lang/gcc-aux uses the release date as its version number in the form of
   YYYYMMDD with a minimum value of 20120614, so there is no version
   overlap.
3) When at least one element of USE_LANGUAGES is "ada", the value of
   20120614 is added to the set of GCC_REQD which selects lang/gcc-aux.
4) The _NEED_NEWER_GCC check is disabled.  It fails and isn't relevant;
   unless a package sets GCC_REQD over 20120614, the only way to select
   lang/gcc-aux is to specify the Ada language and only one compiler
   known to gcc.mk can support it.

1 files changed, 2 insertions, 2 deletions

diff --git a/mk/wrapper/bsd.wrapper.mk b/mk/wrapper/bsd.wrapper.mk
index d55424f8882..8650ec66f37 100644
--- a/mk/wrapper/bsd.wrapper.mk
+++ b/mk/wrapper/bsd.wrapper.mk
@@ -1,4 +1,4 @@
-# $NetBSD: bsd.wrapper.mk,v 1.86 2011/08/04 13:32:05 obache Exp $
+# $NetBSD: bsd.wrapper.mk,v 1.87 2012/07/08 19:57:10 marino Exp $
 #
 # Copyright (c) 2005 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -174,7 +174,7 @@ WRAPPER_${_wrappee_}=	${WRAPPER_BINDIR}/${${_wrappee_}}
 .endfor	# _WRAPPEES
 
 _WRAP_ALIASES.AS=	as
-_WRAP_ALIASES.CC=	cc gcc
+_WRAP_ALIASES.CC=	cc gcc ada
 _WRAP_ALIASES.CXX=	c++ g++ CC cxx
 _WRAP_ALIASES.CPP=	cpp
 _WRAP_ALIASES.FC=	f77 g77