[lwip-users] Lwip make file error

[Gaurav Jain]

After going through the LWIP documents, I wrote a simple tcp echo
server code. To compile it and create an executable I wrote the
following Makefile. Now, when I run the command make all, it gives
error for each of .c files included in the makefile.
The file structure is as follows: 1. tcp_server.c is the main file
where I create the tcp server. 2. It uses the tcp_new(), tcp_bind()
etc functions defined in "lwip-1.4.1/src/core/lwip/tcp.c" and
"lwip-1.4.1/src/core/lwip/tcp_out.c" and I have given the paths for
compilation accordingly.

I am just a beginner in writing makefiles and have written the
following file going through the GNU Make documentation.

The makefile is as follows:

CC=gcc

CFLAGS= -g -Wall

LWIPDIR=../lwip-1.4.1/src

TARGET=tcp_server

INCLUDES= -I../lwip-1.4.1/src/include -I../STABLE-1_4_0/ports/unix/proj/lib\
        -I../STABLE-1_4_0/ports/unix/include -I../lwip-1.4.1/src/include/ipv4

LFLAGS= -L../STABLE-1_4_0/ports/unix/proj/lib/liblwip.so

#LIBS= -llwip

COREFILES=$(LWIPDIR)/core/tcp.c $(LWIPDIR)/core/tcp_out.c

VPATH = $(LWIPDIR)/core

OBJS = tcp_server.o tcp.o tcp_out.o

MAIN=tcp_server

all : edit

edit : $(OBJS)
        $(CC) $(CFLAGS) $(INCLUDES) -o edit $(OBJS) $(LFLAGS)

tcp_server.o : tcp_server.c tcp.o tcp_out.o
        $(CC) $(CFLAGS) $(INCLUDES) -c tcp_server.c $(LFLAGS)

tcp.o : $(LWIPDIR)/core/tcp.c
        $(CC) $(CFLAGS) $(INCLUDES) -c $(LWIPDIR)/core/tcp.c $(LFLAGS)

tcp_out.o : $(LWIPDIR)/core/tcp_out.c
        $(CC) $(CFLAGS) $(INCLUDES) -c $(LWIPDIR)/core/tcp_out.c  $(LFLAGS)

clean :
        rm -f *.o


After going through the LWIP documents, I wrote a simple tcp echo
server code. To compile it and create an executable I wrote the
following Makefile. Now, when I run the command make all, it gives
error for each of .c files included in the makefile.
The file structure is as follows: 1. tcp_server.c is the main file
where I create the tcp server. 2. It uses the tcp_new(), tcp_bind()
etc functions defined in "lwip-1.4.1/src/core/lwip/tcp.c" and
"lwip-1.4.1/src/core/lwip/tcp_out.c" and I have given the paths for
compilation accordingly.

I am just a beginner in writing makefiles and have written the
following file going through the GNU Make documentation.

CC=gcc

CFLAGS= -g -Wall

LWIPDIR=../lwip-1.4.1/src

TARGET=tcp_server

INCLUDES= -I../lwip-1.4.1/src/include -I../STABLE-1_4_0/ports/unix/proj/lib\
        -I../STABLE-1_4_0/ports/unix/include -I../lwip-1.4.1/src/include/ipv4

LFLAGS= -L../STABLE-1_4_0/ports/unix/proj/lib/liblwip.so

#LIBS= -llwip

COREFILES=$(LWIPDIR)/core/tcp.c $(LWIPDIR)/core/tcp_out.c

VPATH = $(LWIPDIR)/core

OBJS = tcp_server.o tcp.o tcp_out.o

MAIN=tcp_server

all : edit

edit : $(OBJS)
        $(CC) $(CFLAGS) $(INCLUDES) -o edit $(OBJS) $(LFLAGS)

tcp_server.o : tcp_server.c tcp.o tcp_out.o
        $(CC) $(CFLAGS) $(INCLUDES) -c tcp_server.c $(LFLAGS)

tcp.o : $(LWIPDIR)/core/tcp.c
        $(CC) $(CFLAGS) $(INCLUDES) -c $(LWIPDIR)/core/tcp.c $(LFLAGS)

tcp_out.o : $(LWIPDIR)/core/tcp_out.c
        $(CC) $(CFLAGS) $(INCLUDES) -c $(LWIPDIR)/core/tcp_out.c  $(LFLAGS)

clean :
        rm -f *.o

All the files include certain headers defined in
"lwip-1.4.1/src/include" and I given the arguments to -I accordingly.
However on running make, the output shows "Undefined reference to" all
the functions which are defined in the lwip header files. What could
be the reason? Where I am going wrong?

I have attached the file as well. Thank you for all the help.

makefile_lwip
Description: Binary data