起手式
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cmake_minimum_required(VERSION 3.21.0)
project(myproj VERSION 0.1.0 LANGUAGES C CXX)
add_executable(myapp main.cpp ...)#编译为myapp.exe
add_library(test STATIC test.hpp)#编译为静态库
add_library(math SHARED main.hpp)#编译为动态库
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生成配置
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mkdir cmake-build
cd cmake-build
cmake ..
cmake --build .
//启用多线程
cmake --build . -- -m:4
cmake --build . -- -j:4
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build.sh
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set -e
mkdir -p build
cd build
cmake ..
cmake --build . --target myapp --config Release
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基本用法
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set(BUILD_SHARED_LIBS ON) #设置bool值
message(STATUS/NOTICE/FATAL_ERROR "BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS}")
#给布尔变量设置默认值。参数：变量的变量名，注释，默认值。
option(BUILD_LIBS "Compile sources into a library" OFF)
#打印变量
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message(“This is the NOTICE message”)
This is the NOTICE message
message(STATUS “This is the STATUS message”)
– This is the STATUS message
message(FATAL_ERROR “This is the FATAL_ERROR message”)
CMake Error at CMakeLists.txt:5 (message):
This is the FATAL_ERROR message
– Configuring incomplete, errors occurred!
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list(APPEND sources main.cpp test.hpp tes.cpp)
add_executable(myapp ${sources}) #列举
#访问环境变量
if(DEFINED ENV{TEMP})
message("TEMP=$ENV{TEMP}")
endif()
#条件变量
if(BUILD_LIBS)
...
else()
...
endif()
#布尔表达式
NOT BUILD_LIBS 取反
A AND B 且
A OR B 或
A STREQUAL B 两个字符串 A 和 B 相等
EXIST PATH 路径为 PATH 的文件或目录存在
DEFINED VAR 变量 VAR 有定义
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添加附加依赖项
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target_link_libraries(myapp PRIVATE math)
target_include_directories(myapp PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/include")
事实上：
add_executable(myapp main.cpp test.cpp)
等于
add_executable(myapp main.cpp)
target_link_libraries(myapp PRIVATE test)
如果子模块中有定义的宏
target_compile_definitions(module PRIVATE 宏名)
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生成动态库
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//要在需生成动态库的模块中配置
#ifdef EXPORT
#define DECL_API __declspec(dllexport)
#else
#define DECL_API __declspec(dllimport)
#endif
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