How to display the value of all the variables in Makefile

Question

I am learning how to write Makefile. I found the .VARIABLES variable which holds all the variables valid in Makefile.

I can check the variables' name with command like this:

test:
    @echo "${.VARIABLES}" | tr ' ' '\n'

But I don't know how to should the values of them. Can anyone teach me to to do that?

Answer 1

If you are using GNU Make, then you can use a crafty combination of foreach and .VARIABLES like this:

test:
    $(foreach var,$(.VARIABLES),$(info $(var) = $($(var))))