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#!/bin/sh
# config.guess: an alternate implementation for modern (cross-)systems.
# modern-hosts: machine detection either via slibtool's --dumpmachine
# output, or by way of a native compiler that implements
# the -dumpmachine switch.
# this file is covered by COPYING.BAUTOMAKE.
# the order of attempted things:
#
# $NATIVE_CC
# $CC_FOR_BUILD
# c99
# cc
# ucc
# gcc
# clang
# cparser
set -eu
mb_script="$0"
mb_status=1
mb_dstamp='2021-06-11'
mb_target=
mb_extarg="${1:-}"
export LC_ALL=C
config_usage()
{
printf 'usage:\n' >&2
printf '\t%s [OPTION]\n' "$mb_script" >&2
printf '\t%s (cross-)target-alias\n\n' "$mb_script" >&2
printf 'Options:\n' >&2
printf '\t%s\n' \
'-h, --help' \
'-t, --time-stamp' \
'-v, --version' \
>&2
printf '\nThis is an alternate config.guess implementation for modern (cross-)systems.' >&2
printf '\nA native system is identified either via `slibtool --dumpmachine`, or by way' >&2
printf '\n of the -dumpmachine output of its priority native compiler.\n\n' >&2
printf 'Native compilers are tried in the following order:\n' >&2
printf '\t%s\n' '$NATIVE_CC' '$CC_FOR_BUILD' 'c99' 'cc' 'ucc' 'gcc' 'clang' 'cparser' >&2
printf '\npkgsite: https://git.foss21.org/bautomake' >&2
printf '\npkgbugs: bugs.automake@foss21.org\n\n' >&2
exit ${mb_status}
}
config_output()
{
printf '%s\n' "$mb_target"
exit 0
}
for arg ; do
case "$arg" in
-h | --help)
mb_status=0
config_usage
;;
-t | --time-stamp)
printf '%s\n' "$mb_dstamp"
exit 0
;;
-v | --version)
printf 'foss21.org config.guess (%s)\n' "$mb_dstamp"
exit 0
;;
-*)
printf '%s: the argument `%s is not supported.\n\n' "$mb_script" "$arg'" >&2
exit 2
esac
done
# no unused arguments
if [ -n "$mb_extarg" ]; then
mb_status=2
config_usage
fi
# try slibtool
if command -v slibtool > /dev/null 2>&1; then
mb_target=$(slibtool --dumpmachine 2>/dev/null || true)
if [ -n "$mb_target" ]; then
config_output
fi
fi
# explicit
mb_native_cc="${NATIVE_CC:-false}"
mb_cc_for_build="${CC_FOR_BUILD:-false}"
# try
for mb_cc_guess in "$mb_native_cc" "$mb_cc_for_build" c99 cc ucc gcc clang cparser; do
mb_target=$($mb_cc_guess -dumpmachine 2>/dev/null || true)
if [ -n "$mb_target" ]; then
config_output
fi
done
# fail
printf '%s: native compiler not found, or does not support -dumpmachine.\n\n' "$mb_script" >&2
exit 2
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