makefile: setting variables globally as well as under phony target

makefile: setting variables

GLOBAL_VAR=GOLBAL_VAR_VALUE     # This value will be set as it is global
export GLOBAL_VAR_EXPORT=GLOBAL_VAR_EXPORT_VALUE  # This value will be set as it is global

# @$(foreach var, $(filter GB_ENV_%, $(.VARIABLES)), $(eval export $(subst GB_ENV_,,$(var))=$($(var))))

all:
#	Following two vars remain unset as Makefile doesn't set var under phony target
	@LOCAL_VAR=LOCAL_VAR_VALUE
	@export LOCAL_VAR_EXPORT=LOCAL_VAR_EXPORT_VALUE

#	Following two vars will be set using eval
	@$(eval LOCAL_VAR_EVAL=LOCAL_VAR_EVAL_VALUE)
	@$(eval export LOCAL_VAR_EXPORT_EVAL=LOCAL_VAR_EXPORT_EVAL_VALUE)

	@echo "GLOBAL_VAR             : $(GLOBAL_VAR)"
	@echo "GLOBAL_VAR_EXPORT      : $(GLOBAL_VAR_EXPORT)"
	@echo "LOCAL_VAR              : $(LOCAL_VAR)"
	@echo "LOCAL_VAR_EXPORT       : $(LOCAL_VAR_EXPORT)"
	@echo "LOCAL_VAR_EVAL         : $(LOCAL_VAR_EVAL)"
	@echo "LOCAL_VAR_EXPORT_EVAL  : $(LOCAL_VAR_EXPORT_EVAL)"