PATCH RFA: Add Go support to top level configure and Makefiles

[Ian Lance Taylor]

This patch adds Go support to the top level configure.ac and
Makefile.tpl/Makefile.def.  The Go support isn't actually committed yet;
this is just in preparation.  Since the directories are not present this
will have no particular effect, just as if one downloaded the gcc-core
tarball without additional language support.

Bootstrapped and tested on x86_64-unknown-linux-gnu.  OK for mainline?

Ian


2010-11-18  Ian Lance Taylor  <iant@google.com>
	    Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

	* configure.ac: Add target-libgo to target_libraries.  Set
	and substitute GOC_FOR_BUILD and GOC_FOR_TARGET.  If we are building
	target-libgo, build target-libffi.
	* Makefile.tpl (BUILD_EXPORTS): Add GOC and GOCFLAGS.
	(HOST_EXPORTS): Add GOC.
	(BASE_TARGET_EXPORTS): Add GOC.
	(GOC_FOR_BUILD, GOCFLAGS, GOC_FOR_TARGET): New variables.
	(GOCFLAGS_FOR_TARGET): New variable.
	(EXTRA_HOST_FLAGS): Add GOC.
	(EXTRA_TARGET_FLAGS): Add GOC and GOCFLAGS.
	* Makefile.def (target_modules): Add libgo.
	(flags_to_pass): Add GOC_FOR_TARGET and GOCFLAGS_FOR_TARGET.
	(dependencies): Add dependency from configure-target-libgo to
	configure-target-libffi and all-target-libstdc++-v3.  Add
	dependencies from all-target-libgo to all-target-libffi.
	(languages): Add go.
	* configure: Rebuild.
	* Makefile.in: Rebuild.


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