在这个例子中,if [ -e example.txt ]是一个shell命令,用于检查example.txt文件是否存在。如果文件存在,则输出“文件存在”;否则,输出“文件不存在”。 3. 综合使用 你可以根据文件是否存在来决定是否执行某些操作。例如,如果文件存在,则编译它;如果不存在,则跳过编译步骤或执行其他操作。 makefile FILE_EXISTS := $(wild
# 定义一个路径变量MY_FILE_PATH:=/path/to/your/file.txt# 判断文件路径是否存在ifneq("$(wildcard $(MY_FILE_PATH))","")has_file:=trueelsehas_file:=falseendif# 根据判断结果执行操作ifeq($(has_file), true)$(info File exists:$(MY_FILE_PATH))else$(info File does not exist:$(MY_FILE_...
▌添加 CheckFunctionExists 宏 首先在顶层 CMakeLists 文件中添加 CheckFunctionExists.cmake 宏,并调用check_function_exists命令测试链接器是否能够在链接阶段找到pow函数。 # 检查系统是否支持 pow 函数include(${CMAKE_ROOT}/Modules/CheckFunctionExists.cmake)check_function_exists(pow HAVE_POW) 将上面这段代码...
Makefile – Check if a file exists using wildcard function 只有注册用户登录后才能阅读该文。 posted @2015-05-21 15:34春天播種,秋天才會收穫阅读(1)评论(0)推荐(0) script 中使用 trap 只有注册用户登录后才能阅读该文。 posted @2015-05-12 18:29春天播種,秋天才會收穫阅读(1)评论(0)推荐(0) shel...
# 列出所有虚拟环境 conda env list # 创建虚拟环境 conda create -n name python=3.6 # 删除...
The above command makes the shell run the script named configure which exists in the current directory. The configure script basically consists of many lines which are used to check some details about the machine on which the software is going to be installed. This script checks for lots of ...
Qt makefile错误你分享的makefile似乎是正确的，除了这个makefile之外，在Debug或Release文件夹中还会有一...
Check if a variable is empty Check if a variable is defined $(MAKEFLAGS) Functions First Functions String Substitution The foreach function The if function The call function The shell function The filter function Other Features Include Makefiles ...
在学习uboot源码之前,要先看一下顶层Makefile,分析gcc版本代码的时候一定是先从顶层Makefile开始的,然后再是子Makefile,这样通过层层分析Makefile即可了解整个工程的组织结构。顶层Makefile也就是uboot根目录下的Makefile文件,由于顶层Makefile文件内容比较多,所以我们将其分开来看。
The above command makes the shell run the script named configure which exists in the current directory. The configure script basically consists of many lines which are used to check some details about the machine on which the software is going to be installed. This script checks for lots of ...