Thread: Compling a module without a main

I have a module pgm that contains only definitions and functions. I have not included a main() statement.

The module does have an associated header file.

When I compile the module I am getting errors as attached:


usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.o: In function `_start':
/usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.o(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status
make: *** [mod.o] Error 1

These are not preventing my other programmes from compiling or running.

However, I also have a makefile that is to compile the "group" of programmes - and if I try "make all" - the compiler is displaying this error and then stopping.

Do I need a main method in my module? (I have tried to put one in, but get errors "multiple definition of main"


If not - is there a flag I should use to compile the module that will eliminate the error.
Thanks
Sue

You compile all of your source files using the -c option.

In any event, ONE (and only one) of your source files must contain a main()

You then "compile" all your objects like so
gcc -o prog main.o functions.o menu.o

Just tell the compiler the list of previously created .o files. The compiler will know what to do with them