.POSIX:

TOOLCHAIN=arm-none-eabi-

CCX=$(TOOLCHAIN)g++
CCFLAGS=-c -Wall -fno-stack-protector -ffreestanding -fno-exceptions -march=armv7-a -mno-unaligned-access -nostdlib -Iinclude -g
STRIP=$(TOOLCHAIN)strip

C_HDR=$(wildcard include/*.h)
C_SRC=$(wildcard src/*.cpp)
C_OBJ=$(patsubst src/%.cpp, obj/c_%.o, $(C_SRC))

A_SRC=$(wildcard src/*.s)
A_OBJ=$(patsubst src/%.s, obj/s_%.o, $(A_SRC))

.PHONY: all environ clean

all: environ bin/kernel.elf

strip: bin/kernel.elf
	$(STRIP) -s bin/kernel.elf

environ:
	mkdir -p bin
	mkdir -p obj

bin/kernel.elf: environ $(A_OBJ) $(C_OBJ)
	arm-none-eabi-ld --nmagic -nostdlib -T src/linker.ld -o bin/kernel.elf obj/*.o

obj/s_%.o: src/%.s
	$(CCX) $(CCFLAGS) -o $@ $<

obj/c_%.o: src/%.cpp $(C_HDR)
	$(CCX) $(CCFLAGS) -o $@ $<

clean:
	rm -f bin/*
	rm -f obj/*