undefined reference to `main' or 'printk' or `__this_module'

[Guest dmiller.org]

When compiling my USB driver I got the following error message which I solved with a change to my makefile. I'm using Mandrake Linux 9.1.

 

Error Message:

 

/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2.2/../../../crt1.o(.text+0x18): In function `_start':

: undefined reference to `main'

/tmp/ccdKE6zL.o(.text+0xc): In function `activewire_probe':

/home/david/lib/test/activewire.c:43: undefined reference to `printk'

/tmp/ccdKE6zL.o(.text+0x20): In function `activewire_disconnect':

/home/david/lib/test/activewire.c:50: undefined reference to `printk'

/tmp/ccdKE6zL.o(.text+0x34): In function `activewire_ioctl':

/home/david/lib/test/activewire.c:58: undefined reference to `printk'

/tmp/ccdKE6zL.o(.text+0x48): In function `activewire_init':

/home/david/lib/test/activewire.c:91: undefined reference to `printk'

/tmp/ccdKE6zL.o(.text+0x54):/home/david/lib/test/activewire.c:92: undefined reference to `usb_register'

/tmp/ccdKE6zL.o(.text+0x6d): In function `activewire_exit':

/home/david/lib/test/activewire.c:99: undefined reference to `printk'

/tmp/ccdKE6zL.o(.text+0x79):/home/david/lib/test/activewire.c:100: undefined reference to `usb_deregister'

/tmp/ccdKE6zL.o(.data+0x40): In function `activewire_init':

/home/david/lib/test/activewire.c:90: undefined reference to `__this_module'

collect2: ld returned 1 exit status

make: *** [activewire.o] Error 1

 

 

The error was solved by adding "-c" option to my makefile:

 

Old file:

activewire.o: activewire.c

gcc -Wall -I/lib/modules/2.4.21-0.13mdk/build/include -g -O -o activewire.o activewire.c

 

 

New file:

activewire.o: activewire.c

gcc -Wall -I/lib/modules/2.4.21-0.13mdk/build/include -g -O -o activewire.o -c activewire.c

 

 

Hope this helps

David