CMake官方教程3--对库加入使用限制

1. 对库加入限制

• CMakeFile.txt

cmake_minimum_required(VERSION 3.10)

# set the project name and version
project(Tutorial VERSION 1.0)


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

configure_file(TutorialConfig.h.in TutorialConfig.h)
add_subdirectory(MathFunctions)


add_executable(Tutorial tutorial.cxx)


target_link_libraries(Tutorial PUBLIC MathFunctions)

target_include_directories(Tutorial PUBLIC
                           "${PROJECT_BINARY_DIR}"
                           #${EXTRA_INCLUDES}
                           )
                                         
                                                  
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• MathFunctions/CMakeLists

add_library(MathFunctions MathFunctions.cxx)                                                                                                                                                                               
                                                                                                                                                                                                                                                                                                                                                                     
target_include_directories(MathFunctions INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")                                                                                                                                          
                                                                                                                                                                                   
option(USE_MYMATH "Use tutorial provided math implementation" ON)                                                                                                                                                          
if (USE_MYMATH)                                                                                                                                                                                                            
  target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")                                                                                                                                                           
                                                                                                                                                                                           
  add_library(SqrtLibrary STATIC                                                                                                                                                                                           
              mysqrt.cxx                                                                                                                                                                                                   
              )                                                                                                                                                                                                            
                                                                                                                                                                                                                           
 
target_include_directories(MathFunctions INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")


option(USE_MYMATH "Use tutorial provided math implementation" ON)
if (USE_MYMATH)
  target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")

  add_library(SqrtLibrary STATIC
              mysqrt.cxx
              )

  target_link_libraries(MathFunctions PRIVATE SqrtLibrary)
endif()
                                                                                                                                                                                                                                    
                                                    
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对于一个库如果只用头文件，则声明为$INTERFACE$;
如果只要源文件，则声明为$PRIVATE$;
否则使用$PUBLIC$

2. 使用接口库设置C++标准

• CMakeLists.txt

cmake_minimum_required(VERSION 3.10)

project(Tutorial VERSION 1.0)


# specify the C++ standard
add_library(tutorial_compiler_flags INTERFACE)
target_compile_features(tutorial_compiler_flags INTERFACE cxx_std_11)


configure_file(TutorialConfig.h.in TutorialConfig.h)

add_subdirectory(MathFunctions)

add_executable(Tutorial tutorial.cxx)

target_link_libraries(Tutorial PUBLIC MathFunctions tutorial_compiler_flags)

target_include_directories(Tutorial PUBLIC
                           "${PROJECT_BINARY_DIR}"
                           #${EXTRA_INCLUDES}
                           )

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target_comiler_flags INTERFACE是一个接口库不会产生编译目标

• Mathfunctions/CMakeLists.txt

add_library(MathFunctions MathFunctions.cxx)


target_include_directories(MathFunctions INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")


option(USE_MYMATH "Use tutorial provided math implementation" ON)
if (USE_MYMATH)
  target_compile_definitions(MathFunctions PRIVATE "USE_MYMATH")

  add_library(SqrtLibrary STATIC
              mysqrt.cxx
              )

  target_link_libraries(SqrtLibrary PUBLIC tutorial_compiler_flags)
  target_link_libraries(MathFunctions PUBLIC SqrtLibrary)
endif()

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