linking problem with gcc

tokernizer · 11-19-2005, 12:02 PM

i have several functions written in different source files all in the same directory. i wrote the prototypes of theses functions in a header file called "filter.h" and included this header file in necessary functions. the main function is in a file called "filter.c". the directory looks like below:
/root/src/
|-- filter.c
|-- filter.h
|-- makefile
|-- shrink.c
...(and other functions)

my makefile is like below:
filter: filter.o
gcc -L/root/src filter.o
filter.o: filter.c filter.h
gcc -c -I/root/src filter.c

when i type "make" in the console, i get these messages:
gcc -c -I/root/exp3 filter.c
gcc -L/root/exp3 filter.o
filter.o(.text+0x25): In function `main':
: undefined reference to `shrink'
collect2: ld returned 1 exit status

"shrink" is the only funcion used in "main". there is no problem in compiling, so i suppose the linker doesn't see my header file "filter.h".where do i make the mistake?

Vookimedlo · 11-19-2005, 12:56 PM

Try this:

Code:

filter: filter.c shrink.o
	gcc -o filter filter.c shrink.o
shrink.o: shrink.c shrink.h
	gcc -c shrink.c