makefile check variable exists
2017年1月18日 — TL;DR: Use the error function: ifndef MY_FLAG $(error MY_FLAG is not set) endif. Note that the lines must not be indented. More precisely, no ... ,If you are using GNU Make, you can use a workaround like ifeq($(origin SET_FLAG),undefined) $(info not set) else $(info set) endif. More or less cribbed from ... ,2013年5月24日 — Most likely your make directives must not be tab indented but start in the first column. I also suspect you want .if(...) or similar, not plain ifdef . ,Conditional Syntax (GNU make) ... Often you want to test if a variable has a non-empty value. ... Variables that have never been defined have an empty value. ,2013年12月13日 — Is myApp a variable or an actual filename? – BugFinder Apr 5 '11 at 14:21 · myApp is for myApplication i.e. the filename by the build process. – ... ,Check if variable is defined in a Makefile check_defined = - $(strip $(foreach 1,$1, - $(call __check_defined,$1,$(strip $(value 2))))) __check_defined = - $(if $(value $1),, - $(error Undefined $1$(if $2, ($2)))) install: $(call check_defined, var1) $(ca,2019年1月2日 — The first $(something) may return an empty string, however the conditional assignment ?= works only if the previous variable is not set, not if empty. ,2018年7月26日 — Note that, due to the time of evaluation, make conditionals ( ifeq , ifneq ...) cannot be used in recipes the way you tried. Use shell conditionals ... ,2011年9月10日 — You can create an implicit guard target, that checks that the variable in the stem is defined, like this: guard-%: @ if [ "$$*}}" = "" ]; then - echo ...
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 makefile check variable exists 相關參考資料
Abort makefile if variable not set - Stack Overflow
2017年1月18日 — TL;DR: Use the error function: ifndef MY_FLAG $(error MY_FLAG is not set) endif. Note that the lines must not be indented. More precisely, no ... https://stackoverflow.com Check if environmental variable is set in makefile - Stack ...
If you are using GNU Make, you can use a workaround like ifeq($(origin SET_FLAG),undefined) $(info not set) else $(info set) endif. More or less cribbed from ... https://stackoverflow.com Checking if variables are defined in a makefile - Stack Overflow
2013年5月24日 — Most likely your make directives must not be tab indented but start in the first column. I also suspect you want .if(...) or similar, not plain ifdef . https://stackoverflow.com Conditional Syntax (GNU make) - GNU.org
Conditional Syntax (GNU make) ... Often you want to test if a variable has a non-empty value. ... Variables that have never been defined have an empty value. https://www.gnu.org How do I check if file exists in Makefile so I can delete it ...
2013年12月13日 — Is myApp a variable or an actual filename? – BugFinder Apr 5 '11 at 14:21 · myApp is for myApplication i.e. the filename by the build process. – ... https://stackoverflow.com Makefile check if variable is defined · GitHub
Check if variable is defined in a Makefile check_defined = - $(strip $(foreach 1,$1, - $(call __check_defined,$1,$(strip $(value 2))))) __check_defined = - $(if $(value $1),, - $(error Undefined $1$(i... https://gist.github.com Makefile set if variable is empty - Stack Overflow
2019年1月2日 — The first $(something) may return an empty string, however the conditional assignment ?= works only if the previous variable is not set, not if empty. https://stackoverflow.com Makefile test if variable is not empty - Stack Overflow
2018年7月26日 — Note that, due to the time of evaluation, make conditionals ( ifeq , ifneq ...) cannot be used in recipes the way you tried. Use shell conditionals ... https://stackoverflow.com Makefile variable as prerequisite - Stack Overflow
2011年9月10日 — You can create an implicit guard target, that checks that the variable in the stem is defined, like this: guard-%: @ if [ "$$*}}" = "" ]; then - echo ... https://stackoverflow.com |