我们可以从上面的示例中看到三个关键字：ifeq、else和endif。ifeq的意思表示条件语句的开始，并指定一个条件表达式，表达式包含两个参数，以逗号分隔，表达式以圆括号括起。else表示条件表达式为假的情况。endif表示一个条件语句的结束，任何一个条件表达式都应该以endif结束。当我们的变量$(CC)值是“gcc”...
5，嵌入式 Makefile中:=与=与+=与=的区别$@，$^，$<区别：在Makefile中我们经常看到 = := ?= +=这几个赋值运算符,那么他们有什么区别呢?我们来做个简单的实验 新建一个Makefile,内容为: ifdef DEFINE_VRE VRE = "HelloWorld!" else endif ifeq ($(OPT),define) VRE ?="Hello 。
3 changes: 3 additions & 0 deletions 3 extensions/vscode-colorize-tests/test/colorize-fixtures/makefile Original file line numberDiff line numberDiff line change @@ -63,7 +63,10 @@ ${info Parentheses () in braces {()}: $(ok)} ifeq ("${ok}", "skip") $(ok))} else ifeq ("$...
下面是一个示例的Makefile,展示了如何对特定文件使用ifeq测试: 代码语言:txt 复制 # 定义变量 FILE := myfile.txt # 条件判断 ifeq ($(FILE), myfile.txt) # 如果文件名为myfile.txt,则执行以下指令 @echo "This is myfile.txt" else # 如果文件名不为myfile.txt,则执行以下指令 @echo "This is no...
有时候,我们还是需要让make命令带入一些参数给makefile脚本。 比如,你在代码里面需要定义一个宏DEBUG来打开调试开关,代码如下:intmain(){int i=9;#ifdef DEBUGi=1;#elsei=0;#endifprintf("i=%d\n",i);return0;}一般来说,这个宏定义可以通过直接修改源代码进行,但这样显然不是很好的办法。另外一个办法是通...
$ make -r echo 'false' false In essence, a build script known as makefile (VERSION 3) can be defined as: ifeq ( a , a ) all:: echo 'true' else all:: echo 'false' endif Upon execution, the result obtained is: $ make -r ...
makefile 是个古老又难以回避的技术. 同shell一样,其中一些语法特别古怪又难以琢磨. 这里 GNU Make的一些语法进行拾遗补充说明. 0 变量定义与赋值 0.1 一般写法 0.1.1 变量名 = 变量值 特点: 延时扩展 递归扩展 样例: b = var b says $(a) ! a = hello wolrd $(warning $(b)) # 输出: makefile:...
else ifeq ($(PLATFORM_VERSION),4.2.1) $(info "___4.2"); LOCAL_CFLAGS += -DPLUSCREENCAST_17 else ifeq ($(PLATFORM_VERSION),4.1.1) $(info "___4.1"); LOCAL_CFLAGS += -DPLUSCREENCAST_16 endif endif endif endif
else # Some other target needs "build" "refresh" "product" # "build" is done above ifeq (,$(filter build refresh clean depend linktree,$(MAKECMDGOALS)) include make.refresh include make.product endif # "make.refresh" is needed for refresh ...
same makefile, will $(origin var) produce `undefined' or `file'? I guess I can test that with a couple of warning functions in an ifeq .. else .. endif construct. In any case, that leaves me with having to find a similar method to ...