Change Makefile variable value inside the target body

Question

Is there a way to reassign Makefile variable value inside of the target body?

What I am trying to do is to add some extra flags for debug compilation:

Answer 1

Yes, there is an easy way to do it, and without rerunning Make. Use a target-specific variable value:

test: clean debug_compile

debug_compile: ERLCFLAGS += -DTEST
debug_compile: compile compile_test;