makefile ifeq empty
The lines of the makefile following the ifeq are obeyed if the two arguments match; otherwise they ... Often you want to test if a variable has a non-empty value. ,GNU make: Conditional Syntax. ... conditional-directive text-if-true else text-if-false endif. or: ... Often you want to test if a variable has a non-empty value.
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 makefile ifeq empty 相關參考資料
Abort makefile if variable not set - Stack Overflow
Makefile:17: *** Undefined OUT_DIR (build directory). Stop. ... It's sometimes OK if the variable is defined with an empty value. I'd use $(if $(filter ... https://stackoverflow.com GNU make - Conditional Parts of Makefiles
The lines of the makefile following the ifeq are obeyed if the two arguments match; otherwise they ... Often you want to test if a variable has a non-empty value. https://ftp.gnu.org GNU make: Conditional Syntax
GNU make: Conditional Syntax. ... conditional-directive text-if-true else text-if-false endif. or: ... Often you want to test if a variable has a non-empty value. https://www.gnu.org Makefile set if variable is empty - Stack Overflow
Any elegant solution to set the variable if empty? GNU make is hardly known for elegant solutions. Unless you find trapdoors and minefields to ... https://stackoverflow.com Makefile test if variable is not empty - Stack Overflow
Note that, due to the time of evaluation, make conditionals ( ifeq , ifneq ...) cannot be used in recipes the way you tried. Use shell conditionals ... https://stackoverflow.com makefile: fail on single make target if variable empty - Stack ...
A couple of things: First, you must keep your Make commands and shell commands neatly segregated. This: ifeq ($(A),$(B)) ... endif. Is Make ... https://stackoverflow.com makefile中的ifeq ifneq ifdef ifndef條件判斷| 程式前沿
feq ifneq ifdef ifndef 條件語句中使用到了三個關鍵字："ifeq"、"else" ... 前導和結尾空格，“TEXT-IF-EMPTY”也會被作為Makefile需要執行的一部分。 https://codertw.com Null check and empty string check in makefile - Stack Overflow
Just to be clear, make doesn't care about quotes in any way. When make talks about "empty" variables it means variable with no value. If you ... https://stackoverflow.com 跟我一起写Makefile:使用条件判断- Ubuntu中文
概述+ MakeFile介绍+ 书写规则+ 书写命令+ 使用变量+ 使用条件判断| ... 我们可以从上面的示例中看到三个关键字：ifeq、else和endif。ifeq的意思表示 ... 这个示例中使用了“strip”函数，如果这个函数的返回值是空（Empty），那么<text-if-empty>;就生效。 https://wiki.ubuntu.org.cn |