Autotools: Check for cross_compiling=yes #15238
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The cross_compiling variable can initially be "yes", "no", or "maybe" (when only --host option is added). Autoconf otherwise after AC_PROG_CC resets it to "no" in such case but to be sure, this checks for value "yes" instead. The HAVE_FNMATCH template can be also set after the AC_DEFINE as autoheader scans the templates overall the source code.
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The cross_compiling variable can initially be "yes", "no", or "maybe" (when only --host option is added). Autoconf otherwise after AC_PROG_CC resets it to "no" in such case but to be sure, this checks for value "yes" instead. The HAVE_FNMATCH template can be also set after the AC_DEFINE as autoheader scans the templates overall the source code.