makefile assign if not defined
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 ...,conditional-directive text-if-true else text-if-false endif. or: ... The syntax of the conditional-directive is the same whether the conditional is simple or complex; after an else or not. There are four ... Variables that have never been defined have an ,A variable is a name defined in a makefile to represent a string of text, called the ... If you'd like a variable to be set to a value only if it's not already set, then you ... , The first $(something) may return an empty string, however the conditional assignment ?= works only if the previous variable is not set, not if ..., Note: the following won't work if the variable are not defined in the terminal, as they are set in the bash script. Makefile. dSourceP?=$(shell pwd) ..., However, when I run make step using any of the above, I always get the VER is not set error. Simply put, how can I test for a variable in a specific ...,To set a variable from the makefile, write a line starting with the variable name ... If you'd like a variable to be set to a value only if it's not already set, then you ...
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 makefile assign if not defined 相關參考資料
Abort makefile if variable not set - Stack Overflow
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 Conditional Syntax (GNU make)
conditional-directive text-if-true else text-if-false endif. or: ... The syntax of the conditional-directive is the same whether the conditional is simple or complex; after an else or not. There are f... https://www.gnu.org GNU make - How to Use Variables
A variable is a name defined in a makefile to represent a string of text, called the ... If you'd like a variable to be set to a value only if it's not already set, then you ... https://ftp.gnu.org Makefile set if variable is empty - Stack Overflow
The first $(something) may return an empty string, however the conditional assignment ?= works only if the previous variable is not set, not if ... https://stackoverflow.com Makefile: Default Value of Variable that is set but has null ...
Note: the following won't work if the variable are not defined in the terminal, as they are set in the bash script. Makefile. dSourceP?=$(shell pwd) ... https://unix.stackexchange.com makefile: fail on single make target if variable empty - Stack ...
However, when I run make step using any of the above, I always get the VER is not set error. Simply put, how can I test for a variable in a specific ... https://stackoverflow.com Setting (GNU make) - Gnu.org
To set a variable from the makefile, write a line starting with the variable name ... If you'd like a variable to be set to a value only if it's not already set, then you ... https://www.gnu.org |