ifndef with multiple AND conditions in makefile gnu

Question

How do I ensure that make command has the parameter ENV passed in it?

Eg: make destroy ENV=test if ENV is not passed I should throw error.

Code:

ENV ?=prod
ifndef ENV
   $(error ENV is not defined, Please provide ENV paramter in your make command)
ifndef FORCE
   @/bin/echo -n "Are you sure to DESTROY configuration for ${ENV}? [y/N] " && read ans && [ $${ans:-N} = y ]
endif
endif
   terraform destroy ${ARGS}

Answer 1

The question is whether you want to test whether they are empty, or whether they are defined. If you want to test that at least one is set to a non-empty value, you can use the following trick:

ifeq ($(CONDITION1)$(CONDITION2),)
# Both CONDITION1 and CONDITION2 are empty or not defined
endif

If you want to test if either is defined (but potentially emtpy), you could would use the origin function:

ifeq ($(origin CONDITION1)$(origin CONDITION2),undefinedundefined)
# Both CONDITION1 and CONDITION2 are not defined
endif

For more complex expressions, you can also use the $(if ...), $(and ...) and $(or ...) functions (see here). eg:

ifeq ($(or $(CONDITION1),$(CONDITION2)),)
# Both CONDITION1 and CONDITION2 are empty or not defined
endif

---

EDIT:

As to the updated question, it is a bit different than what you were originally asking. The cleanest way to do this is to add the checks in a recipe rather than conditional parts of the make:

checkenv:
   @[ "$(origin ENV)" -eq "command line" ] \
       || echo "ERROR ENV not defined on command line" >&2 \
       && false
   @[ $(FORCE) ] \
       || echo -n "Are you sure to DESTROY configuration for ${ENV}? [y/N]" \
       && read ans \
       && [ $${ans:-N} = y ] 

maintarget: checkenv
    terraform destroy ${ARGS}