bug#27810: macOS runtime feature detection

[Richard Stallman]

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  > Should I stop working on this? I honestly don’t believe it will have
  > any effect on cross compilation, and the default is to not include the
  > feature detection code unless you ask for it explicitly.

I wasn't trying to make a decision about this particular question.
I was disagreeing with the general idea that it was better to do
Autoconf tests by running programs rather than by just compiling them.

If your code would have no effect at all other than on MacOS,
it can't do much harm.

-- 
Dr Richard Stallman
President, Free Software Foundation (gnu.org, fsf.org)
Internet Hall-of-Famer (internethalloffame.org)
Skype: No way! See stallman.org/skype.html.