It's possible, though probably atypical, to list only libraries on a
linker commandline.
For example this sequence creates a program, despite the fact that it
listed only libraries on the commandline:
$ echo 'int main(){return 0;}' > main.c
$ gcc -c main.c
$ ar cur libmain.a main.o
$ gcc -L. -lmain
$ ./a.out
Jeff
