configure

#!/usr/bin/env bash

# configure: Makefile generator
# Copyright © 2011-2019 Lukas Martini

# This file is part of Xelix.
#
# Xelix is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Xelix is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Xelix. If not, see <http://www.gnu.org/licenses/>.

function w {
	echo "$@" >> Makefile
}

FIND=$(command -v gfind || command -v find)

# Update submodules
[ -x "$(command -v git)" ] && git submodule update --init 1> /dev/null

# Make sure config.h exists on first build
if [ ! -f ".config" ]; then
	util/kconfiglib/alldefconfig.py
fi

if [ ! -f "src/lib/config.h" ]; then
	util/kconfiglib/genconfig.py --header-path src/lib/config.h
fi

# Get architecture from config
arch=`sed -rn 's/\#define CONFIG_ARCH "([^"]+)"/\1/p' src/lib/config.h`


# Get files
extensions="\.\(c\|asm\|s\|psf\|img\)"
arch_files=`$FIND -L src -type f -iregex "^.*$arch-.*$extensions" | tr '\n' '  '`
files=`$FIND -L src -type f -iregex "^[^\-]*$extensions" | tr '\n' '  '`
files="$arch_files$files"

echo -e "# This file has been generated by ./configure. You usually don't \
want to change it manually.\n" > Makefile
w "ARCH := $arch"
w "include Makefile.static"

w -n "xelix.bin: "
for i in $files
do
	w -n " ${i%\.*}"

	if [[ ${i##*.} =~ ^(asm|S|psf|img)$ ]]; then
		w -n "-${i##*.}"
	fi
	w -n ".o"
done

w " ext/picotcp/build/lib/libpicotcp.a"
w "	\$(LD) $^ -o xelix.bin \$(MAKE_LDFLAGS) \$(LDFLAGS)"

for i in $files
do
	deps=`gcc -nostdinc -I src -MM $i -MQ $i 2> /dev/null | tr ' \n ' ' ' | tr ' \\\  ' ' '`
	deps=($deps)
	unset deps[1]
	deps[0]=$(echo "${deps[0]}" | sed 's/\.c/\.o/')
	w ${deps[*]}
done