“No referenc to main” message while running the library [closed]

Question

The error:

farah@farah-VirtualBox:~$ gcc libmy_string.a
/usr/lib/gcc/i686-linux-gnu/4.6/../../../i386-linux-gnu/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

and the code for the library is as follows:

library : my_string.o<br>
    ar rcs libmy_string.a my_string.o<br>
run: string_compare.c<br>
    gcc -o run string_compare.o -L. -lmy_string<br>
string_compare.o: string_compare.c my_string.h<br>
            gcc -c string_compare.c<br>
my_string.o: my_string.c my_string.h<br>
            gcc -c my_string.c<br>

library : my_string.o<br>
    ar rcs libmy_string.a my_string.o<br>
.PHONY: clean<br>
clean:<br>
    rm -rf *.o run<br>

Additional information: My main method is in string_compare.c and method and header are my_string.c and my_string.h respectively.

Answer 1

Programming questions are offtopic here afaik. But I suggest you to have a look at this question.

You have to specify a main function or tell the linker which function it should use instead.

Assuming your entry point should be string_compare() you have to add -Wl,-estring_compare as options to your gcc call.