bug#27810: macOS runtime feature detection

[Richard Stallman]

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  > AFAIU, cross-compiling Emacs cannot work because building Emacs
  > includes dumping, which needs to run the produced binary.

'make emacs' can't run to completion in a cross-environment, but
cross-compilation can work well enough in practice.  Precisely, 'make
temacs' can work with a cross compiler; then you can dump with temacs
on the target platform.


-- 
Dr Richard Stallman
President, Free Software Foundation (gnu.org, fsf.org)
Internet Hall-of-Famer (internethalloffame.org)
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