CMake.md

tags	created
cmake tool	2023-03-16T00:43:34 (UTC +08:00)

CMake

01-基础

A-hello-cmake

一个非常简单的CMake项目，只包含两个文件：

1. CMakeLists.txt - 包含CMake命令的文件，表示你想怎么运行项目。在执行CMake命令时，CMake会首先查看这个文件，如果不存在会报错

2. main.cpp - 简单的源代码

CMakeLists 参数说明

1. cmake_minimum_required ：项目支持的最小的CMake版本

2. project (hello_cmake)：项目名称

3. add_executable(hello_cmake main.cpp)：add_executable()命令指定应从指定的源文件构建可执行文件，在本例中为main.cpp。add_executable()函数的第一个参数是要构建的可执行文件的名称，第二个参数是要编译的源文件列表。如图，项目构建后会创建hello_cmake 可执行文件|

$ cmake ..
-- The C compiler identification is GNU 11.2.0
-- The CXX compiler identification is GNU 11.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/cjj/cmake-examples/01-basic/A-hello-cmake/build
$ make
[ 50%] Building CXX object CMakeFiles/hello_cmake.dir/main.cpp.o
[100%] Linking CXX executable hello_cmake
[100%] Built target hello_cmake
$ ./hello_cmake
Hello CMake!

B-hello-headers

与hello_cmake不同，这个项目新增了头文件。

$ tree
.
├── CMakeLists.txt
├── include
│   └── Hello.h
├── README.adoc
└── src
    ├── Hello.cpp
    └── main.cpp

Variable	Info
CMAKE_SOURCE_DIR	The root source directory
CMAKE_CURRENT_SOURCE_DIR	The current source directory if using sub-projects and directories.
PROJECT_SOURCE_DIR	The source directory of the current cmake project.
CMAKE_BINARY_DIR	The root binary / build directory. This is the directory where you ran the cmake command.
CMAKE_CURRENT_BINARY_DIR	The build directory you are currently in.
PROJECT_BINARY_DIR	The build directory for the current project.