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Make: Check if Makefile target is called with a required input arg #Makefile #make
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| # Check that given variables are set and all have non-empty values, | |
| # die with an error otherwise. | |
| # | |
| # PARAMS: | |
| # 1. Variable name(s) to test. | |
| # 2. (optional) Error message to print. | |
| # | |
| # EXAMPLE: | |
| # @:$(call check_defined, ENV_REGION, you must set ENV_REGION=usc1|awsuse2) | |
| # | |
| check_defined = \ | |
| $(strip $(foreach 1,$1, \ | |
| $(call __check_defined,$1,$(strip $(value 2))))) | |
| __check_defined = \ | |
| $(if $(value $1),, \ | |
| $(error Undefined $1$(if $2, ($2))$(if $(value @), \ | |
| required by target `$@'))) |
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