cmake find_package說明

CMake中find_package功能演示

find_package可以被用來在系統中自動查找配置構建工程所需的程序庫。在linux和unix類系統下這個命令尤其有用。CMake自帶的模塊文件里有大半是對各種常見開源庫的find_package支持，支持庫的種類非常多。

find_package(Qt5Widgets)，find_package(Qt4 COMPONENTS QTCORE QTGUI QTOPENGL QTSVG)返回之后

就會有變量Qt5Widgets_FOUND，Qt5Widgets_INCLUDE_DIRS相應的變量生效。

 

然后就可以在CMakeLists.txt里面使用上述的變量了。類似如下：

1 INCLUDE_DIRECTORIES(${QT_INCLUDES})
2 INCLUDE_DIRECTORIES(${Qt5Widgets_INCLUDE_DIRS})
3 INCLUDE_DIRECTORIES(${Qt5Svg_INCLUDE_DIRS})
4 INCLUDE_DIRECTORIES(${Qt5OpenGL_INCLUDE_DIRS})
5 INCLUDE_DIRECTORIES(${Qt5Concurrent_INCLUDE_DIRS})

if(Qt5Widgets_FOUND)


message(STATUS ${Qt5Widgets_INCLUDE_DIRS})
   #qt5
else()
 find_package(Qt4 REQUIRED)  #qt4
 include(${QT_USE_FILE})
endif()

 

例子：

cmake_minimum_required(VERSION 2.6 FATAL_ERROR)

project(hello)

set(Boost_USE_STATIC_LIBS ON)
set(Boost_USE_MULTITHREAD ON)

#查找boost庫中python的bind庫
#REQUIRED表示如果沒有找到，cmake會停止處理，並報告一個錯誤.
find_package( Boost 1.35 REQUIRED
COMPONENTS python)

#找到Boost后，變量Boost_INCLUDE_DIRS中將包括指定boost庫頭文件的查找路徑.
#變量Boost_LIBRARY_DIRS中將包含指定boost庫的.a或.so文件的所在目錄的路徑.
include_directories(${Boost_INCLUDE_DIRS})
link_directories(${Boost_LIBRARY_DIRS})

find_package(PythonLibs 2.5 REQUIRED)

add_library(hello SHARED
hello.cpp)

include_directories(${PYTHON_INCLUDE_PATH})

target_link_libraries(hello 
debug ${Boost_PYTHON_LIBRARY_DEBUG}
optimized ${Boost_PYTHON_LIBRARY_RELEASE}
)

target_link_libraries(hello
debug ${PYTHON_DEBUG_LIBRARIES}
optimized ${PYTHON_LIBRARIES}
)