GCC与.o文件链接

Question

I'm trying to compile my code but it isn't working. I got this to compile at school but I can't compile this on my home computer. I can't seem to figure out why. I need this error fixed in order to continue my assignment. Also, this list.o file is the profs file. I have to use this file.

Solutions I've tried kind of? I've updated gcc to gcc-7. I've located libc.a

/usr/lib/x86_64-linux-gnu/libc.a
/usr/share/doc/libklibc/README.klibc.arch

Edit: I have tried compiling without -fPIC

gcc -m64 -pthread -Wall -std=c99 -o run main.o as2.o list.o
/usr/bin/ld: list.o: relocation R_X86_64_32S against undefined symbol...

This is from the terminal:

gcc -m64 -pthread -Wall -std=c99 -fPIC  -o run main.o as2.o list.o
/usr/bin/ld: list.o: relocation R_X86_64_32S against undefined symbol `headlist' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status

This is my make file:

CC = gcc
CFLAGS = -m64 -pthread -Wall -std=c99 -fPIC 
PROG = run
OBJS = main.o as2.o list.o

run: $(OBJS)
    $(CC) $(CFLAGS) -o $(PROG) $(OBJS)

main.o: main.c list.h as2.h
     $(CC) $(CFLAGS) -c main.c

as2.o: as2.c as2.h list.h
    $(CC) $(CFLAGS) -c as2.c

clean:
    rm main.o as2.o run

This is my includes:

#include <netinet/in.h> 
#include <sys/socket.h> 
#include <netdb.h>  
#include <unistd.h> 
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <pthread.h> 
#include "list.h"
#include "as2.h"

Any ideas/solutions?

Answer 1

EDIT: changed the spelling from LFLAGS to LDFLAGS to appease some comment.

EDIT: moved the -c option to appease some comment.

Note: all is normally the first target in a make file.

Note: used := rather than = so the macros would only be evaluated once.

Note: the list.o is already available in the current directory (per the OPs question) so is not compiled in the makefile. But is only linked with the other object files to produce the executable

your makefile seems to have a few oversights. Suggest:

CC := gcc
RM := rm -f

CFLAGS := -ggdb -m64 -pthread -Wall -Wextra -pedantic -std=c99
#LDFLAGS :=   <-- use the default value

PROG := run
OBJS := main.o as2.o list.o
HDRS := list.h as2.h



.PSEUDO: all clean

all: $(PROG)

$(PROG): $(OBJS)
    $(CC)  -ggdb -o $(PROG) $(OBJS) $(LDFLAGS)

main.o: main.c $(HDRS)
     $(CC) $(CFLAGS) -c main.c -o main.o -I.

as2.o: as2.c $(HDRS)
    $(CC) $(CFLAGS) -c as2.c -o as2.o -I.

clean:
    $(RM) main.o as2.o run