To compile two files i have created a makefile where i use to mention the object name or i can use the pattern rule using patsubst.
# ----------------------------------------------------------------------------
# Makefile for building tapp
#
# Copyright 2010 FriendlyARM (http://www.arm9.net/)
#
ifndef DESTDIR
DESTDIR ?= /opt/FriendlyARM/tiny6410/linux/rootfs_qtopia_qt4
endif
#CFLAGS = -c -Wall -O2 # wall is for warning show and 02 is optiminisation level 2
CFLAGS = -c -O2 # wall is for warning show and 02 is optiminisation level 2
#CC = arm-linux-gcc # compiler name
CC = gcc # compiler name
LD = ld
INSTALL = install #
TARGET = led_player_project
#OBJ = led-player_backup.o led-player.o
OBJ := $(patsubst %.c,%.o,$(wildcard *.c */*.c))
#OBJ = $(shell find . -name '*.c')
all: $(TARGET)
#all: $(OBJ)
led_player_project : $(OBJ)
$(LD) $(LDFLAGS) -o $@ $(OBJ) $(LIBS)
# $(LD) $(LDFLAGS) -o $@ $< $(LIBS)
%.o : %.c
$(CC) $(CFLAGS) $< -o $@
#$< -o $@
install: $(TARGET)
$(INSTALL) $^ $(DESTDIR)/usr/bin
clean :
rm -rf *.o $(TARGET) $(OBJ)
# ----------------------------------------------------------------------------
.PHONY: $(PHONY) install clean
# End of file
# vim: syntax=make
#EOF
Now if my project contains folder contains subfolders & they contains further files. Then can i write pattern rule to compile every file & create an common executable?
1> Do i will have to create makefile in every-subfolder so that i can invoke that makefile from main makefile, like integrating static driver to linux kernel each driver have respective makefile ?
2> Or common makefile for full project ?
3> can i use patsubst to compile every file without mentioning there name.
4> How can i combine every *.o to create on executable called main.
Edit :---
@Jan Hudec
I have modified my makefile as per your comment (i have posted it above). Now i am just trying with two folders inside my main folder. I am getting following error
Folder structure :--
main Folder ----> one Folder
----> two Folder
Folder Main contains :--
main.c
main.h
Makefile
Folder one contains :--
one.c
one.h
Folder two contains :--
two.c
two.h
main.c content :--
#include <stdio.h>
#include <stdlib.h>
#include "main.h"
int main()
{
char *p;
printf("\n\n main \n");
one();
two();
return 0;
}
main.h content :---
#include "one/one.h"
#include "two/two.h"
one.c content :---
#include <stdio.h>
#include <stdlib.h>
#include "one.h"
void one()
{
printf("\n one \n");
}
one.h content :---
void one();
two.c content :---
#include <stdio.h>
#include <stdlib.h>
#include "two.h"
void two()
{
printf("\n two \n");
}
two.h content :---
void two();
Error i got at make time :----
ignite@ignite:~/testing/main$ make
gcc -c -O2 main.c -o main.o
gcc -c -O2 one/one.c -o one/one.o
gcc -c -O2 two/two.c -o two/two.o
ld -o led_player_project main.o one/one.o two/two.o
ld: warning: cannot find entry symbol _start; defaulting to 0000000008048080
main.o: In function `main':
main.c:(.text.startup+0x11): undefined reference to `puts'
one/one.o: In function `one':
one.c:(.text+0xb): undefined reference to `puts'
two/two.o: In function `two':
two.c:(.text+0xb): undefined reference to `puts'
make: *** [led_player_project] Error 1
ignite@ignite:~/testing/main$
