compilation error : undefined reference to 'main'

manoj1987's Avatar, Join Date: Apr 2009
Light Poster
Hi !
I have been learning C back from basics. Recently i tried out a simple program myHello.c , which contained the following code :

  1. //myHello.c
  2. #include"hello.h"
  3. int main(void)
  4. {
  5. hello("WORLD");
  6. return 0;
  7. }
next, i created hello.h that contained the following code :
  1. //hello.h
  2. void hello(const char* name);
Finally i created helloFunc.c that contained the declaration for hello() :
  1. //helloFunc.c
  2. #include<stdio.h>
  3. #include"hello.h"
  4. void hello(const char* name)
  5. {
  6. printf("hello, %s \n",name);
  7. }
I compiled the C sources as follow :
gcc -Wall myHello.c helloFunc.c -o newHello

I received the following error :
/usr/lib/gcc/i486-linux-gnu-4.3.3/../../../../libcrt1.o: In function '_start' :

/build/buildd/libc-2.9/csu/../sysdeps/i386/elf/start.S:115: undefined reference to 'main'


collect2: ld returned 1 exit status

i tried googling , but couldnt get a satisfying solution ! please help !

<Manoj>
0
prasad1990's Avatar, Join Date: Jul 2009
Light Poster
hey try removing 'void' from main............
0
manoj1987's Avatar, Join Date: Apr 2009
Light Poster
Hi !
I tried a different solution :

just use a Makefile.
You need to build them using:

gcc -c helloFunc.c -o helloFunc.o
gcc -c myHello.c -o myHello.o
gcc myHello.o helloFunc.o -o hello

Let me also try the solution you suggested . Thanks :-)