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#!/bin/sh

cmdexists()
{
    type "$1" > /dev/null 2>&1
}

trycmd()
{
    local name="$1"
    shift
    test -z "$(eval echo \$$name)" && cmdexists "$1" && eval "$name=\"$*\""
}

trycmd CC "gcc"
trycmd CC "clang"
trycmd CC "cc"
trycmd CC "false"

case "$($CC -dumpmachine 2>/dev/null)" in
    *x86_64*) exit 0;;
esac
exit 1