How to check if a variable is set in Makefile?

To check if a variable is set in Makefile, use the unset command. Did you write a Makefile that tries to figure out all the different ways there are for a user to set an environment variable before compiling your program? It can be a tricky, time-consuming problem, but there's a simple check you can add to your Makefile so that you can be sure you're taking care of it all.

makefile ifeq or

on Jan 01, 1970

ifeq ($(GCC_MINOR),4)
    @echo Supported version
else ifeq ($(GCC_MINOR),5)
    @echo Supported version
else
    @echo Unsupported version
endif

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How to check if a variable is set in Makefile?

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