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# Kernel makefile
CFLAGS := -ffreestanding -Wall -Wextra -g -std=gnu99 -O2 -Iinclude --sysroot=$(SYSROOT) \
-isystem="/usr/include"
CXXFLAGS := -ffreestanding -Wall -Wextra -fno-exceptions -fno-rtti -g -O2 -Iinclude --sysroot=$(SYSROOT) \
-isystem="/usr/include"
LDFLAGS := -T arch/$(ARCH)/linker.ld -ffreestanding -g -O2 -Iinclude --sysroot=$(SYSROOT) \
-isystem="/usr/include"
ASMFLAGS :=
ifeq ($(ARCH),x86_64)
CFLAGS += -mno-red-zone -mcmodel=kernel -mno-sse -mno-sse2 -mno-mmx
CXXFLAGS += -mno-red-zone -mcmodel=kernel -mno-sse -mno-sse2 -mno-mmx
LDFLAGS += -mno-red-zone -mcmodel=kernel -mno-sse -mno-sse2 -mno-mmx
ASMFLAGS += -felf64
endif
ifndef SYSROOT
$(error No sysroot specified)
endif
LIBS = -nostdlib -lc -lgcc
#Find all the source files
CPP_SRCS := $(shell find . -type f -name '*.cpp' -not -path './arch/*') \
$(shell find $(PWD)/kernel/arch/$(ARCH) -type f -name '*.cpp')
HEADERS := $(shell find ./include -type f -name '*.h')
#ASMFILES := $(shell find $(PWD) -type f -name '*.asm' -prune $(PWD)/arch) \
$(shell find $(PWD)/kernel/arch/$(ARCH) -type f -name '*.asm')
#OBJS := $(patsubst %.c,%.o,$(C_SOURCES))
OBJS := $(patsubst %.cpp,%.o,$(CPP_SRCS))
OBJS += $(patsubst %.asm,%.o,$(ASMFILES))
#DEPFILES := $(patsubst %.c,%.d,$(C_SOURCES))
DEPFILES := $(patsubst %.cpp,%.d,$(CPP_SRCS))
# LINKLST := crti.o
# LINKLST += $(CRTBEGIN)
LINKLST += $(OBJS)
LINKLST += $(LIBS)
# LINKLST += $(CRTEND)
# LINKLST += crtn.o
-include $(DEPFILES)
.PHONY: all clean
all: kernel.bin
kernel.bin: ${OBJS}
$(info [INFO] Linking kernel)
$(CXX) ${LDFLAGS} -o $@ $(LINKLST)
%.o: %.cpp
# $(info [INFO] Compiling $<)
$(CXX) ${CXXFLAGS} -MMD -MP -c $< -o $@
%.o: %.c
# $(info [INFO] Compiling $<)
$(CC) $(CFLAGS) -MMD -MP -c $< -o $@
%.o: %.asm
$(info [INFO] Assembling $<)
$(NASM) $< $(ASMFLAGS) -o $@ -g
# crti.o:
# $(NASM) arch/$(ARCH)/crti.asm $(ASMFLAGS) -o $@
# crtn.o:
# $(NASM) arch/$(ARCH)/crtn.asm $(ASMFLAGS) -o $@
install-headers: $(HEADERS)
cp -r --preserve=timestamps include/. $(SYSROOT)/usr/include
clean:
$(info [INFO] Cleaning)
$(RM) ${OBJS} $(DEPFILES) kernel.bin
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