Hi Eric,

>> I haven't tried to readd the boehm-gc objc support that has also been
>> disabled, don't know about anybody using that.
>
> I always configure with --enable-objc-gc. The only reason Apple
> deprecated garbage collection for Objective C is because they replaced
> it with Automated Reference Counting in clang, which GCC doesn't
> support yet. So, until GCC supports Automated Reference Counting,
> please keep boehm-gc support for objc.

me too, though mostly to have maximum test coverage (primarily on
Solaris).  As expected, a x86_64-apple-darwin16 bootstrap with
--enable-objc-gc just failed for me.  I'm testing the following patch
(on top of Jakub's).

	Rainer


2016-10-01  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* configure.ac (target_libraries): Readd target-boehm-gc.
	Restore --enable-objc-gc handling.
	* configure: Regenerate.