makefile variable if not set
2016年8月6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. ,2012年6月1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. ,2018年9月21日 — I have a Makefile that has a variable that needs to have a default value in case when variable is unset or if set but has null value. ,2022年11月12日 — You can't set a makefile variable from within it. There are ways to get around this however, using the $(shell) and $(eval) makefile commands. ,2023年7月19日 — Setting a variable refers to defining a variable with an initial value as well as changing its value later in the program. You can either set a ... ,2021年10月20日 — If BUILDVERSION is not defined or is defined to an empty string, you will get that empty variable name error. ,A conditional causes part of a makefile to be obeyed or ignored depending on the values of variables. Conditionals can compare the value of one variable to ... ,Most variable names are considered to have the empty string as a value if you have never set them. Several variables have built-in initial values that are not ... ,The syntax of a simple conditional with no else is as follows: conditional-directive text-if-true endif The text-if-true may be any lines of text. ,Check if variable is defined in a Makefile. Using ifndef, ifndef MY_FLAG, $(error MY_FLAG is not set), endif, Using custom function.
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 makefile variable if not set 相關參考資料
How to conditionally set Makefile variable to something if it ...
2016年8月6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 How to abort makefile if variable not set?
2012年6月1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. https://stackoverflow.com Makefile: Default Value of Variable that is set but has null ...
2018年9月21日 — I have a Makefile that has a variable that needs to have a default value in case when variable is unset or if set but has null value. https://unix.stackexchange.com Variables not being set in Makefile
2022年11月12日 — You can't set a makefile variable from within it. There are ways to get around this however, using the $(shell) and $(eval) makefile commands. https://superuser.com Understanding and Using Makefile Variables
2023年7月19日 — Setting a variable refers to defining a variable with an initial value as well as changing its value later in the program. You can either set a ... https://earthly.dev How to avoid the error empty variable name in Makefile
2021年10月20日 — If BUILDVERSION is not defined or is defined to an empty string, you will get that empty variable name error. https://unix.stackexchange.com GNU make - Conditional Parts of Makefiles
A conditional causes part of a makefile to be obeyed or ignored depending on the values of variables. Conditionals can compare the value of one variable to ... https://www.math.utah.edu GNU make - How to Use Variables
Most variable names are considered to have the empty string as a value if you have never set them. Several variables have built-in initial values that are not ... https://ftp.gnu.org Conditional Syntax (GNU make)
The syntax of a simple conditional with no else is as follows: conditional-directive text-if-true endif The text-if-true may be any lines of text. https://www.gnu.org Makefile check if variable is defined
Check if variable is defined in a Makefile. Using ifndef, ifndef MY_FLAG, $(error MY_FLAG is not set), endif, Using custom function. https://gist.github.com |