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rebornwwp/Makefile

Forked from rlespinasse/Makefile
Created September 26, 2020 10:26
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guard-makefile
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Makefile
task-who-need-specific-envvar: guard-SPECIFIC_ENVVAR
@echo ${SPECIFIC_ENVVAR}
guard-%:
@ if [ "${${*}}" = "" ]; then \
echo "Environment variable $* not set"; \
exit 1; \
fi
# $ make task-who-need-specific-envvar
# Environment variable SPECIFIC_ENVVAR not set
# make: *** [guard-SPECIFIC_ENVVAR] Error 1
# $ make task-who-need-specific-envvar SPECIFIC_ENVVAR=value
# value
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