Override target in makefile to add more commands?

Question

At work we use a common makefile that other makefiles include (via the include statement) and it has a generic \"clean\" target that kills some common files. I want to add

Answer 1

Use implicit rules:

existing-target: my-extention

my-extention:
    echo running command 1
    echo running command 2

Very simple make tutorial to ramp up.

When using :: you can run into issues since make complains when you mix single colon : and double colon :: rules:

a:
    echo a

a::
    echo aa

will result in:

. . .
*** target file `a' has both : and :: entries.  Stop.