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all: floppy.img

loader.o: loader.asm
	nasm -f aout -o loader.o loader.asm

main.o: main.c
	gcc -Wall -O -fstrength-reduce -fomit-frame-pointer -finline-functions -nostdinc -fno-builtin -I./include -c -o main.o main.c

memory.o: memory.c
	gcc -Wall -O -fstrength-reduce -fomit-frame-pointer -finline-functions -nostdinc -fno-builtin -I./include -c -o memory.o memory.c

string.o: string.c
	gcc -Wall -O -fstrength-reduce -fomit-frame-pointer -finline-functions -nostdinc -fno-builtin -I./include -c -o string.o string.c

kernel.bin: loader.o main.o memory.o string.o
	ld -T link.ld -o kernel.bin loader.o main.o memory.o string.o
	
floppy.img: kernel.bin
	cat stage1 stage2 pad kernel.bin > floppy.img

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COMPILER := gcc
ASSEMBLER := nasm

PRJDIRS := loader memory string

NASM_SOURCE_FILES := $(shell find $(PROJDIRS) -mindepth 1 -maxdepth 3 -name "*.asm")
C_SOURCE_FILES := $(shell find $(PROJDIRS) -mindepth 1 -maxdepth 3 -name "*.c")
C_HEADER_FILES := $(shell find $(PROJDIRS) -mindepth 1 -maxdepth 3 -name "*.h")

ALL_SOURCE_FILES := $(NASM_SOURCE_FILES) $(C_SOURCE_FILES) $(C_HEADER_FILES)

OBJECT_FILES := $(patsubst %.c,%.o,$(C_SOURCE_FILES)) $(patsubst %.asm,%.o,$(NASM_SOURCE_FILES))

COMPILER_FLAGS :=  -Wall -O -fstrength-reduce -fomit-frame-pointer -finline-functions -nostdinc -fno-builtin

all: kernel.bin
	
kernel.bin: $(OBJECT_FILES)
	ld -T link.ld -o kernel.bin $(OBJECT_FILES)

%.o: %.c
	$(COMPILER) $(COMPILER_FLAGS) -I./include -c -o $@ $<
	
%.o: %.asm
	$(ASSEMBLER) -f aout -o $@ $<

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make -k all 
ld -T link.ld -o kernel.bin ./string/string.o ./main.o ./memory/memory.o ./loader/loader.o
./main.o: In function `kmain':
main.c:(.text+0x0): multiple definition of `kmain'
./string/string.o:(.text+0x0): first defined here
./memory/memory.o: In function `memcpy':
memory.c:(.text+0x0): multiple definition of `memcpy'
./string/string.o:(.text+0x10): first defined here
./memory/memory.o: In function `memset':
memory.c:(.text+0x29): multiple definition of `memset'
./string/string.o:(.text+0x39): first defined here
./memory/memory.o: In function `memsetw':
memory.c:(.text+0x4b): multiple definition of `memsetw'
./string/string.o:(.text+0x5b): first defined here
./loader/loader.o:./loader/loader.o:(.text+0x20): multiple definition of `_loader'
./string/string.o:(.text+0xa0): first defined here
make: *** [kernel.bin] Error 1
make: Target `all' not remade because of errors.

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#ifndef SYSTEM_H_
#define SYSTEM_H_
extern unsigned char *memcpy(unsigned char *dest, const unsigned char *src, int count);
extern unsigned char *memset(unsigned char *dest, unsigned char val, int count);
extern unsigned short *memsetw(unsigned short *dest, unsigned short val, int count);
#endif /*SYSTEM_H_*/

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int strlen(const char *str)
{
    int retval = 0;
    while(*str++!='\0') retval++;
    return retval;
}