Cmake-2

target_include_directories(Tutorial PUBLIC"${PROJECT_BINARY_DIR}")

把配置文件写到二进制树中。

# specify the C++ standard
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED True)

上面的命令指定C++的标准。

Step 2：增加一个库

把自定义的库文件放到子目录：MathFunctions；库包含头文件：MathFunctions.h和源文件：mysqrt.cxx；有一个方法是mysqrt。

add_library(MathFunctions mysqrt.cxx)的cmakeLists.txt到MathFunctions的子目录中。

为了使用mathFunctions的功能，高一级的cmakeLists的写法如下：

# add the MathFunctions library
add_subdirectory(MathFunctions)# add the executable
add_executable(Tutorial tutorial.cxx)target_link_libraries(Tutorial PUBLIC MathFunctions)# add the binary tree to the search path for include files
# so that we will find TutorialConfig.h
target_include_directories(Tutorial PUBLIC"${PROJECT_BINARY_DIR}""${PROJECT_SOURCE_DIR}/MathFunctions")

为了让这个math库变为可配置的。

option(USE_MYMATH "Use tutorial provided math implementation" ON)# configure a header file to pass some of the CMake settings
# to the source code
configure_file(TutorialConfig.h.in TutorialConfig.h)

改变上一级的cmakelist.txt:

if(USE_MYMATH)add_subdirectory(MathFunctions)list(APPEND EXTRA_LIBS MathFunctions)list(APPEND EXTRA_INCLUDES "${PROJECT_SOURCE_DIR}/MathFunctions")
endif()# add the executable
add_executable(Tutorial tutorial.cxx)target_link_libraries(Tutorial PUBLIC ${EXTRA_LIBS})# add the binary tree to the search path for include files
# so that we will find TutorialConfig.h
target_include_directories(Tutorial PUBLIC"${PROJECT_BINARY_DIR}"${EXTRA_INCLUDES})

在 in tutorial.cxx中使用宏定义：

#ifdef USE_MYMATH
#  include "MathFunctions.h"
#endif

#ifdef USE_MYMATHconst double outputValue = mysqrt(inputValue);
#elseconst double outputValue = sqrt(inputValue);
#endif

编译：

cmake ../Step2 -DUSE_MYMATH=OFF

Step 3：添加库的使用要求

1）接口的使用，是用户需要的，需要修改MathFunctions/CMakeLists.txt增加下面一行:

target_include_directories(MathFunctionsINTERFACE ${CMAKE_CURRENT_SOURCE_DIR})

如果增加了上面一行，那就可以修改上一级的CMakeLists.txt:

if(USE_MYMATH)add_subdirectory(MathFunctions)list(APPEND EXTRA_LIBS MathFunctions)
endif()

And here:

target_include_directories(Tutorial PUBLIC"${PROJECT_BINARY_DIR}")

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