Makefile pattern rule fails?

Question

While using GNU-make, my Makefile has some pattern rule as:

%.o:%.c
    gcc $< -o:$@

This rule is added by me.

But when I do mak

Answer 1

You might need spaces around the : in the first line of your rule. Also, gcc does not take a colon before the output file name; just use -o $@.