Initial commit

1 files changed, 41 insertions, 0 deletions

diff --git a/makefile b/makefile
new file mode 100644
index 0000000..82e3bba
--- /dev/null
+++ b/makefile
@@ -0,0 +1,41 @@
+# https://www.gnu.org/software/make/manual/html_node/Setting.html
+# :=	expanded variable, right-hand side can contain variables
+# ?=	only set if it doesn't have a value
+# !=	execute a shell script on the right-hand side and assign its result to the left-hand side
+
+TARGET := i686-elf
+
+NASM := nasm
+CXX := clang++
+CXXFLAGS := -std=c++20 -ffreestanding -nostdinc -fno-exceptions -fno-rtti -Wall -Wextra -O2
+INCLUDE := stdlib
+
+OBJ := kernel.o vga.o stdlib/string.o stdlib/stdlib/console.o
+
+# $@ is target
+# $< is first dependency
+# $^ is all dependencies
+
+default: boot.o $(OBJ)
+	ld.lld -T linker.ld -o myos.bin boot.o $(OBJ)
+
+boot.o: boot.asm
+	$(NASM) -felf32 -o $@ $^
+
+$(OBJ): %.o : %.cc
+	$(CXX) -target $(TARGET) $(CXXFLAGS) -I$(INCLUDE) -c $^ -o $@
+
+iso:
+	mkdir -p isodir/boot/grub
+	cp myos.bin isodir/boot/myos.bin
+	cp grub.cfg isodir/boot/grub/grub.cfg
+	grub-mkrescue -o myos.iso isodir
+
+run:
+	qemu-system-i386 -kernel myos.bin
+
+clean:
+	rm boot.o $(OBJ) myos.bin
+
+clean-iso:
+	rm -rf isodir