makefile ifeq empty
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 $(filter ...,The lines of the makefile following the ifeq are obeyed if the two arguments match; otherwise they ... Often you want to test if a variable has a non-empty value. ,GNU make: Conditional Syntax. ... conditional-directive text-if-true else text-if-false endif. or: ... Often you want to test if a variable has a non-empty value. , Any elegant solution to set the variable if empty? GNU make is hardly known for elegant solutions. Unless you find trapdoors and minefields to ..., Note that, due to the time of evaluation, make conditionals ( ifeq , ifneq ...) cannot be used in recipes the way you tried. Use shell conditionals ..., A couple of things: First, you must keep your Make commands and shell commands neatly segregated. This: ifeq ($(A),$(B)) ... endif. Is Make ..., 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。, 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 ...,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。
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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 |