zealbooter: Backport build system improvements from limine-barebones

.gitignore

@@ -15,4 +15,6 @@
 *.hdd
 *.o
 *.d
-/zealbooter/limine.h
+/zealbooter/src/limine.h
+/zealbooter/bin
+/zealbooter/obj

build/build-iso.sh

@@ -105,7 +105,7 @@ sudo cp limine/BOOTX64.EFI $TMPISODIR/EFI/BOOT/BOOTX64.EFI
 sudo cp limine/limine-uefi-cd.bin $TMPISODIR/Boot/Limine-UEFI-CD.BIN
 sudo cp limine/limine-bios-cd.bin $TMPISODIR/Boot/Limine-BIOS-CD.BIN
 sudo cp limine/limine-bios.sys $TMPISODIR/Boot/Limine-BIOS.SYS
-sudo cp ../zealbooter/zealbooter.elf $TMPISODIR/Boot/ZealBooter.ELF
+sudo cp ../zealbooter/bin/kernel $TMPISODIR/Boot/ZealBooter.ELF
 sudo cp ../zealbooter/Limine.CFG $TMPISODIR/Boot/Limine.CFG
 echo "Copying DVDKernel.ZXE over ISO Boot/Kernel.ZXE ..."
 sudo mv $TMPMOUNT/Tmp/DVDKernel.ZXE $TMPISODIR/Boot/Kernel.ZXE

zealbooter/GNUmakefile

@@ -3,7 +3,7 @@ override MAKEFLAGS += -rR
 
 # This is the name that our final kernel executable will have.
 # Change as needed.
-override KERNEL := zealbooter.elf
+override KERNEL := kernel
 
 # Convenience macro to reliably declare user overridable variables.
 define DEFAULT_VAR =
@@ -63,8 +63,8 @@ override CFLAGS += \
 
 # Internal C preprocessor flags that should not be changed by the user.
 override CPPFLAGS := \
-    -I. \
-    -I./lib \
+    -I src \
+    -I src/lib \
     $(CPPFLAGS) \
     -MMD \
     -MP
@@ -89,43 +89,47 @@ override NASMFLAGS += \
 
 # Use "find" to glob all *.c, *.S, and *.asm files in the tree and obtain the
 # object and header dependency file names.
-override CFILES := $(shell find -L . -type f -name '*.c')
-override ASFILES := $(shell find -L . -type f -name '*.S')
-override NASMFILES := $(shell find -L . -type f -name '*.asm')
-override OBJ := $(CFILES:.c=.c.o) $(ASFILES:.S=.S.o) $(NASMFILES:.asm=.asm.o)
-override HEADER_DEPS := $(CFILES:.c=.c.d) $(ASFILES:.S=.S.d)
+override CFILES := $(shell cd src && find -L . -type f -name '*.c')
+override ASFILES := $(shell cd src && find -L . -type f -name '*.S')
+override NASMFILES := $(shell cd src && find -L . -type f -name '*.asm')
+override OBJ := $(addprefix obj/,$(CFILES:.c=.c.o) $(ASFILES:.S=.S.o) $(NASMFILES:.asm=.asm.o))
+override HEADER_DEPS := $(addprefix obj/,$(CFILES:.c=.c.d) $(ASFILES:.S=.S.d))
 
 # Default target.
 .PHONY: all
-all: $(KERNEL)
+all: bin/$(KERNEL)
 
-limine.h:
-	curl -Lo $@ https://github.com/limine-bootloader/limine/raw/trunk/limine.h || cp ../build/limine/limine.h limine.h || echo "ERROR"
+src/limine.h:
+	curl -Lo $@ https://github.com/limine-bootloader/limine/raw/trunk/limine.h || cp ../build/limine/limine.h src/limine.h || echo "ERROR"
 
 # Link rules for the final kernel executable.
-$(KERNEL): GNUmakefile linker.ld $(OBJ)
+bin/$(KERNEL): GNUmakefile linker.ld $(OBJ)
+	mkdir -p "$$(dirname $@)"
 	$(LD) $(OBJ) $(LDFLAGS) -o $@
 
 # Include header dependencies.
 -include $(HEADER_DEPS)
 
 # Compilation rules for *.c files.
-%.c.o: %.c GNUmakefile limine.h
+obj/%.c.o: src/%.c GNUmakefile src/limine.h
+	mkdir -p "$$(dirname $@)"
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
 
 # Compilation rules for *.S files.
-%.S.o: %.S GNUmakefile limine.h
+obj/%.S.o: src/%.S GNUmakefile src/limine.h
+	mkdir -p "$$(dirname $@)"
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
 
 # Compilation rules for *.asm (nasm) files.
-%.asm.o: %.asm GNUmakefile
+obj/%.asm.o: src/%.asm GNUmakefile
+	mkdir -p "$$(dirname $@)"
 	nasm $(NASMFLAGS) $< -o $@
 
 # Remove object files and the final executable.
 .PHONY: clean
 clean:
-	rm -rf $(KERNEL) $(OBJ) $(HEADER_DEPS)
+	rm -rf bin obj
 
 .PHONY: distclean
 distclean: clean
-	rm -f limine.h
+	rm -f src/limine.h