help: makefile: directory rules

There are two directories /src1 and /src2 where the soruce codes are, and another directory /headers for head files.

How should the makefile set variables ( not to hard code all the directories) so that the complier can find these files?


Many thanks!

Paul

BIN = gcc

BASE = ./
SRC1 = $(BASE)/src1/
SRC2 = $(BASE)/src2/

to include headers use -I like :

$(BIN) -I "./headers/"

hi dude543,

Thank you so much for your help!

Another question is that how to put the compiled file in a predifined directory. For example, there is a directory ./output/, and I want all the compiled .o file be stored in ./output. and also, like the .exe file in another directory like ./?

Thanks again.

Regards,
Paul

something like that

Code:

---

odir=./obj
exedir=./exe
target=myprog.exe

$(exedir)/$(target): $(odir)/mod1.o $(odir)/mod1.o
        gcc $(odir)/mod1.o $(odir)/mod1.o -o $(exedir)/$(target)

$(odir)/mod1.o: mod1.c
        gcc -c mod1.c -o $(odir)/mod1.o

$(odir)/mod2.o: mod2.c
        gcc -c mod2.c -o $(odir)/mod2.o

---

Kurt

Thanks for the message.

Now i'm using :
.c.o:
$(CC) -c $(CFLAGS) $<

rather than individaul lines to declare complie. How should I add the directory information in this command?

Thanks again!

Paul

I've just figured out by myself as the following :D

hope it can help anyone in future. And thanks for the helps from these nice guys.

#===================START========================= ===
CC = gcc

BASE = ./
HEAD_DIR = $(BASE)headers/
SRC_DIR = $(BASE)src/ $(BASE)src/file_process/
OBJ_DIR = $(BASE)obj/

SRC = main.c real_lines.c parse_line.c record.c
OBJ = main.o read_lines.o parse_line.o record.o
HEADER = file_handler.h
PROG = handler

CFLAGS = -ggdb -Wall -I$(HEAD_DIR)

vpath %.c $(SRC_DIR)
vpath %.o $(OBJ_DIR)

$(OBJ_DIR)%.o : %.c
$(COMPILE.c) $< -o $@

$(PROG) : $(addprefix $(OBJ_DIR), $(OBJ))
$(LINK.o) $^ -o $@

all : $(PROG)

clean :
-rm handler $(addprefix $(OBJ_DIR), $(OBJ))
#================END======================

Basically, i've got a ./src where all my source codes are, a ./headers where all .head files, and ./obj where i'd like all complied files to be.

-I$(HEAD_DIR) : links head files included in source file.

vpath %.c $(SRC_DIR) and vpath %.o $(OBJ_DIR) : tells the compiler the directories and source codes and head files

(COMPILE.c) <==> $(CC) -c $(CFLAGS)

$(addprefix $(OBJ_DIR), $(OBJ)) : that's the thing making evey generated object to a predefined directory.

$(LINK.o) $^ -o $@ : I'm still a bit confused it, but just know it's a implicit rule like (COMPILE.c) .