PATCH RFA: Permit languages to share target_libs

[Ian Lance Taylor]

OK, here is a different approach for the issue that target-libgo
requires target-libffi.  With this patch, we only add target_libs for
disabled languages to noconfigdirs if they are not in target_libs for
any enabled languages.

In order to make this work for Go, I had to prevent --disable-libgcj
from adding libffi to noconfigdirs.  This does mean that libffi will be
built for the case of --enable-languages=java --disable-libgcj, unless
libffi is disabled for the target.  I don't think that is a big deal.  I
doubt this is a widely used case, and libffi is a small library.

Bootstrapped on x86_64-unknown-linux-gnu.  I configured with the
following options and examined the generated Makefile to make sure that
it looked OK:

--enable-languages=c
--enable-languages=c,java
--enable-languages=c,go
--enable-languages=c,go,java
--enable-languages=c,go,java --enable-libgcj
--enable-languages=c,go,java --disable-libgcj

OK for mainline?

Ian


2010-11-19  Ian Lance Taylor  <iant@google.com>

	* configure.ac: Only disable a language library if no language needs
	it.  Don't let --disable-libgcj uncondtionally disable libffi.


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