Exercise 1 - Creating a Library

1.使用add_library(MathFunctions MathFunctions.cxx mysqrt.cxx)建立lib

2.add_subdirectory(MathFunctions)包含子目录

3.target_link_libraries(Tutorial PUBLIC MathFunctions)链接

4.target_include_directories(Tutorial PUBLIC ${CMAKE_BINARY_DIR} ${CMAKE_SOURCE_DIR}/MathFunctions)包含链接库头文件

总结：

建立链接库add_library

添加链接库：target_link_libraries target_include_directories

Exercise 2 - Adding an Option

1.定义：

option(USE_MYMATH "Use tutorial provided math implementation" ON)

2.if：

if(USE_MYMATH)
    target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")
add_library(SqrtLibrary STATIC
mysqrt.cxx
)
target_link_libraries(MathFunctions PRIVATE SqrtLibrary)
endif()

其中 target_compile_definitions定义可被#ifdefine访问

Documents