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guard-makefile
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| 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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