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Improve cross-compilation support [once autoconf 2.70 is widespread] #1199

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Improve cross-compilation support [once autoconf 2.70 is widespread] #1199

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Commits on Jan 4, 2021

  1. Add AC_CANONICAL_HOST to improve cross-compilation 

    Autoconf 2.70 is more careful about cross compilation, so with this
version using AC_FUNC_MMAP implicitly pulls in AC_CANONICAL_HOST.
So we might as well use AC_CANONICAL_HOST explicitly and improve
our "shared library type" check, regardless of autoconf version.

Using AC_CANONICAL_HOST causes autoconf 2.69 or earlier to search for
install-sh unconditionally. So we might as well also add AC_PROG_INSTALL
and use @install@.

This requires the config.guess, config.sub, and install-sh support scripts.
Add instructions about how to add them to a Git checkout. (Release tarballs
will also have to take steps to ensure they are present.) In autoconf 2.70
(but not previous versions), autoreconf -i/--install creates these files.
    @jmarshall
    jmarshall committed Jan 4, 2021
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