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bug#27810: macOS runtime feature detection

From: Eli Zaretskii
Subject: bug#27810: macOS runtime feature detection
Date: Fri, 28 Jul 2017 20:36:00 +0300

> From: Richard Stallman <address@hidden>
> CC: address@hidden, address@hidden
> Date: Fri, 28 Jul 2017 13:14:19 -0400
>   > 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.

You'd need to copy the entire build tree to the target platform for
that to work, so it's not really a cross-build anymore, not in the
usual sense.

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