# Kernel Makefile
# try `make help` for more information
echo=$(shell which echo) -e

# Default target
.DEFAULT_GOAL = all

# Kernel source files
LINKER_SCRIPT = compiler/sections.ld
CC_SOURCES = $(shell find * -name "*.cc" -a ! -name '.*' -a ! -path 'test*' -a ! -path 'fs/tool/*' -a ! -path 'assets/*' -a ! -path 'tools/*')
ASM_SOURCES = $(shell find * -name "*.asm"  -a ! -name '.*')

# Target files
KERNEL = $(BUILDDIR)/system
KERNEL64 = $(KERNEL)64
ISOFILE = $(BUILDDIR)/stubs.iso
KERNEL_LINK = $(ROOTBUILDDIR)/system.img

# Include global variables and standard recipes
include ../tools/common.mk

all: $(KERNEL)


# Linking the system image
# We use the C++ compiler (which calls the actual linker)
$(KERNEL64): $(ASM_OBJECTS) $(CC_OBJECTS) $(LINKER_SCRIPT) $(MAKEFILE_LIST)
	@echo "LD		$@"
	@mkdir -p $(@D)
	$(VERBOSE) $(CXX) $(CXXFLAGS) -Wl,-T $(LINKER_SCRIPT) -o $@ $(LDFLAGS) $(ASM_OBJECTS) $(CC_OBJECTS)
	@echo "LN		$(KERNEL_LINK)"
	$(VERBOSE) ln -sf $(@:$(ROOTBUILDDIR)/%=%) "$(KERNEL_LINK)"

# The kernel must be a 32bit elf for multiboot compliance
$(KERNEL): $(KERNEL64)
	$(VERBOSE) $(OBJCOPY) -I elf64-x86-64 -O elf32-i386 $< $@