Get gcc / clang, in C or C++, information

get_includes

#!/usr/bin/env bash

declare -a includes

function	get_includes()
{
	local	compiler="${1:-gcc}"
	local	language="${2:-c}"
	local	data beg_inc end_inc

	data="$(echo | "${compiler}" -x${language} -v -E - 2>&1)"

	beg_inc="$(<<< ${data} grep -n '<...> search starts here:' | cut -f1 -d':')"
	end_inc="$(<<< ${data} grep -n 'End of search list.' | cut -f1 -d':')"
	includes+=($(<<< ${data} sed -n "$((beg_inc + 1)),$((end_inc - 1))p"))
}

get_includes "gcc"
get_includes "clang"
get_includes "cc"

includes=($(tr ' ' '\n' <<<${includes[@]} | sort -u ))

echo Includes :
printf -- "- %s\n" ${includes[@]}