makefile check variable empty
If no goals were given on the command line, this variable is empty. ... whose recipe is a simple shell test if $(var) expands to a non-empty string.,Conditionals control what make actually "sees" in the makefile, so they cannot be used to control ... Often you want to test if a variable has a non-empty value.
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 makefile check variable empty 相關參考資料
Abort makefile if variable not set - Stack Overflow
Check that given variables are set and all have non-empty values, # die with an error otherwise. # # Params: # 1. Variable name(s) to test. # 2. https://stackoverflow.com Conditional checks in makefile - Stack Overflow
If no goals were given on the command line, this variable is empty. ... whose recipe is a simple shell test if $(var) expands to a non-empty string. https://stackoverflow.com GNU make - Conditional Parts of Makefiles
Conditionals control what make actually "sees" in the makefile, so they cannot be used to control ... Often you want to test if a variable has a non-empty value. ftp://ftp.gnu.org Makefile - How to check if variable is not empty and is one of the ...
This would be a commonplace sort of solution: Makefile ENVIRONMENT ?= development ifeq ($(filter $(ENVIRONMENT),development ... https://stackoverflow.com Makefile set if variable is empty - Stack Overflow
From GNU make, chapter 7.2, Syntax of Conditionals: "Often you want to test if a variable has a non-empty value. When the value results from complex ... https://stackoverflow.com Makefile test if variable is not empty - Stack Overflow
Makefile test if variable is not empty. run a shell command and capture the output in a make variable. do something if the variable is not empty. https://stackoverflow.com makefile: fail on single make target if variable empty - Stack ...
The commands in a makefile recipe are shell commands, to be passed to the ... playing with ifeq in isolation; always test new tools in isolation.). https://stackoverflow.com shell - Checking environment variables' value in Makefile - Unix ...
The ifeq() directive has to be in column 1, remove any leading whitespace ie test_target: ifeq ($(TEST),"TRUE") echo "Do something" endif. https://unix.stackexchange.com |