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Exactly when does autoconf enter cross-compilation mode?

From: wferi
Subject: Exactly when does autoconf enter cross-compilation mode?
Date: Sat, 22 Aug 2020 19:51:46 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

is rather hard to follow in general, but also contains the following
clear-cut statement: "Now, configure enters cross-compilation mode if
and only if --host is passed."

However, if I pass in my build architecture Autoconf 2.69 reports:

$ ./configure --host=x86_64-linux-gnu
checking for x86_64-linux-gnu-gcc... x86_64-linux-gnu-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no

That is, it finds the compiler with the prefixed name but does not enter
cross-compilation mode.  Does "cross-compilation mode" mean something
different, do I misunderstand the documentation, or what is the
resolution of this apparent (to me) contradiction?

(Please Cc me, I'm not subscribed.)

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