* Makefile.in: Fix errors introduced in previous change (in particular,
errors when building gnattools were ignored).
Code clean up and simplification.
update comments.
Remove temporary debug code introduced by mistake in previous check in.
Prefer GNU Make syntax over complex and error-prone sh syntax.
(gnatlib-zcx): New target.
(ada.all.cross): Merged with gnattools-cross target.
From-SVN: r80857
* Makefile.in: Call gcc/ada/Makefile directly, not through the
intermediary of gcc/Makefile. Incorporate all necessary parts of
rules from gcc/ada/Make-lang.in, including extra gnatlib/gnattools
targets, rts-zfp, rts-ravenscar. Get needed bits of GCC
configuration from (new) gcc/libada-mk. Decide what gnatlib variant
to build in configure.ac, not here.
* configure.ac: Provide Makefile.in with the new information it needs,
such as GCC's tmake_file and xmake_file.
* configure: Regenerate.
From-SVN: r80711
