[sr #110348] Simplify rules for when configure enters cross-compiling mode

[Zack Weinberg]

Follow-up Comment #2, sr#110348 (group autoconf):

Nick Bowler raised a serious concern about this change in email:

> You can already force cross-compilation mode today by running
>
>   ./configure cross_compiling=yes
>
> I think it would be better to simply document this more clearly. 
> Changing the behaviour of --host (without --build) to force cross 
> compilation mode seems ill-advised.  As I recall, this was tried before 
> some years back and there were complaints by people cross-building with 
> mingw on GNU/Linux build systems, who actually wanted the runtime tests 
> to be done.
>
> I think the current wording in the manual (which de-emphasized the 
> recommendation to always specify --build and --host together) came as a 
> result of those complaints, and it explicitly mentions the mingw use case.

I'm going to leave this open for now, but when we come back to this
during the 2.73 cycle we should investigate whether the proposed change
can still break cross-builds for mingw, or anyone else.


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