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brimston3/makefile_guard.mak

Created November 29, 2016 01:51
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Makefile env variable declaration guard w/ file existence protection
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makefile_guard.mak
guard-%: GUARD
@ if [ -z '${${*}}' ]; then echo 'Environment variable $* not set.' && exit 1; fi
.PHONY: GUARD
GUARD:
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A modification of http://stackoverflow.com/a/7367903/436063 to force rule evaluation even if a file named guard-VARIABLENAME exists.

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