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

Edit: As explained by Beta in the other answer, it is possible.

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No. There is no way to do this in the Makefile. You can however change the value of a variable on the make command line. If you rewrite your Makefile as follows:

ERLCFLAGS += $(ERLCFLAGSADDED)

%.erl: %.beam
    $(ERLC) $(ERLCFLAGS) -o ebin $<

test: clean compile compile_test

Then, you can invoke make to perform your tests using:

make ERLCFLAGSADDED=-DTEST test