使用CMake构建项目的简明示例（2）

3.  在多个项目的情况下，使用自定义的Find<ProjName>.cmake模块

 

在workspace下增加两个目录(项目)，CMakeModules和TestFindModule如下：

 

workspace

        |—— HelloWorld

        |—— Test

        |—— CMakeModules    FindHELLO.cmake   (存放各子项目的Find<Proj>.cmake 定义)

        |—— TestFindModule    ( 功能同Test子项目，不过使用Find<>.cmake模块来查找、链接HelloWorld项目的头文件和库)

                                |—— CMakeLists.txt

                                |—— src    main.cpp,  CMakeLists.txt

                                |—— build

 

（1）CMakeModules目录下的FindHELLO.cmake

MESSAGE(STATUS $ENV{HOME}/workspace/HelloWorld)FIND_PATH(HELLO_INCLUDE_DIR Hello.h $ENV{HOME}/workspace/HelloWorld/include)#FIND_LIBRARY(HELLO_LIBRARY NAMES hello PATHS $ENV{HOME}/workspace/HelloWorld/lib)FIND_LIBRARY(HELLO_LIBRARY hello $ENV{HOME}/workspace/HelloWorld/lib)IF (HELLO_INCLUDE_DIR) MESSAGE(STATUS "FOUND HELLO.H ${HELLO_INCLUDE_DIR}")ENDIF (HELLO_INCLUDE_DIR)IF (HELLO_LIBRARY) MESSAGE(STATUS "FOUND HELLO LIB ${HELLO_LIBRARY}")ENDIF (HELLO_LIBRARY)IF (HELLO_INCLUDE_DIR AND HELLO_LIBRARY) SET(HELLO_FOUND TRUE)ENDIF (HELLO_INCLUDE_DIR AND HELLO_LIBRARY)IF (HELLO_FOUND) IF (NOT HELLO_FIND_QUIETLY) MESSAGE(STATUS "Found Hello: ${HELO_LIBRARY}") ENDIF (NOT HELLO_FIND_QUIETLY)ELSE (HELLO_FOUND) IF (HELLO_FIND_REQUIRED) MESSAGE(FATAL_ERROR "Could not find hello library") ENDIF (HELLO_FIND_REQUIRED)ENDIF (HELLO_FOUND)

 

（2）TestFindModule目录下的CMakeLists.txt

cmake_minimum_required(VERSION 2.8)PROJECT(TEST)# CMAKE_MODULE_PATH定义必须放到前面SET(CMAKE_MODULE_PATH $ENV{HOME}/workspace/CMakeModules)#MESSAGE(STATUS $ENV{HOME}/workspace/CMakeModules)ADD_SUBDIRECTORY(src)

 

(2) TestFindModule目录src下的main.cpp

#include <Hello.h>int main(int arg, char** argv){ Hello h; h.sayHello();}

 

(3) TestFindModule目录src下的CMakeLists.txt

# FIND_PACKAGE(<name>) 用来调用预定义在 CMAKE_MODULE_PATH 下的 Find<name>.cmake 模块FIND_PACKAGE(HELLO) IF (HELLO_FOUND) SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin) ADD_EXECUTABLE(hello main.cpp) INCLUDE_DIRECTORIES(${HELLO_INCLUDE_DIR}) TARGET_LINK_LIBRARIES(hello ${HELLO_LIBRARY})ENDIF (HELLO_FOUND)

 

最后，进入build目录执行:

cmake ..

make

 

到bin目录下测试可执行文件:

$ ./main  

$ Hello CMake!