CMake add_subdirectory()

Question

Introduction:

I am trying to use CMake to obtain cross platform compilation scripts (for VS 9.0 on a Windows32 and Makefiles for Unix).

I am experiencing something i can't understand about add_subdirectory().

Let me show you my code :

Context:

My architecture for a module named "module1" is something like this :

• CMakeLists.txt
• include/
  • file1.h
  • file2.h
  • *.h
• src/
  • file1.cpp
  • file2.cpp
  • *.cpp
• test/
  • CMakeLists.txt
  • src/
    • testfile1.cpp
    • testfile2.cpp

The architecture of my whole application is composed of these modules which are in themselves projects that could work independantly.

My goals:

1. I want to compile my module as a library

2. I want to test the library with the code in the test/ folder

Here are the CMakeLists i wrote :

This one is the CMakeLists.txt in the root directory of my module.

#ENSURE MINIMUM VERSION OF CMAKE
cmake_minimum_required(VERSION 2.8)

#CONFIGURATION OF THE PROJECT   
    #NAME OF THE PROJECT    
     project(MyProject)

    #OUTPUT OF THE PROJECT  
    set(LIBRARY_OUTPUT_PATH lib/${CMAKE_BUILD_TYPE}) 

    #ADD THE HEADERS OF THE LIBRARY BEING CREATED   
    include_directories(include)

    #ADD 3rd PARTY OPENCV LIBRARIES     
    find_package(OpenCV REQUIRED)       

    #ADD 3rd PARTY XERCES LIBRARIES
    include_directories(${XERCES_INCLUDE_DIR})
    link_directories(${XERCES_LIB_DIR})     
    set(Xerces_LIBS xerces-c_3D.lib)


#CONFIGURATION OF THE LIBRARY   
file(GLOB_RECURSE MYPROJECT_MODULE_CXX src/*)   
file(GLOB_RECURSE MYPROJECT_MODULE_HDR include/*)       

#NAME OF THE PRESENT LIBRARY    
set(MYPROJECT_MODULE_LIB_NAME myModuleLib)
add_library(${MYPROJECT_MODULE_LIB_NAME}
        SHARED
        ${MYPROJECT_MODULE_CXX}
        ${MYPROJECT_MODULE_HDR}
        )   
target_link_libraries(${MYPROJECT_MODULE_LIB_NAME}
               ${OpenCV_LIBS}
               ${Xerces_LIBS}
               )

#CONTINUE IN THE SUB FOLDERS
add_subdirectory(test)

And then, in the test/ folder, here is the CMakeLists.txt

#ENSURE MINIMUM VERSION OF CMAKE
cmake_minimum_required(VERSION 2.8)

#CONFIGURATION OF THE PROJECT
    #NAME OF THE PROJECT
    project(MyProjectTest)

    #OUTPUT OF THE PROJECT
    set(EXECUTABLE_OUTPUT_PATH bin/${CMAKE_BUILD_TYPE})

    #ADD OUR TESTED LIBRARY
    include_directories(../include)
    link_directories(../build/lib/${CMAKE_BUILD_TYPE})


#CONFIGURATION OF THE EXE
    file(GLOB_RECURSE MYPROJECT_MODULE_TEST_CXX src/*)

    #NAME OF THE PRESENT EXECUTABLE
    set(MYPROJECT_MODULE_TEST_BIN_NAME myModuleTest)
    add_executable(${MYPROJECT_MODULE_TEST_BIN_NAME}
               ${MYPROJECT_MODULE_TEST_CXX}
               )
    target_link_libraries(${MYPROJECT_MODULE_TEST_BIN_NAME}
                  ${MYPROJECT_MODULE_LIB_NAME}
                  )

Question

The CMake outputs a correct MyProject.sln Visual Studio 9.0 solution, which compiles successfully in my library linked with OpenCV and Xerces (and other 3rd part libraries). However the test binary did not output any MyProjectTest.sln.

I thought, (and read in the CMake documentation) that add_subdirectory(dir) was used to do CMake in the following sub directory (i mean, the name could not be clearer :p !), so shouldn't it continue CMake in the test/ directory and create my MyProjectTest.sln solution ?

I use the GUI CMake to run the root CMakeLists.txt in a build directory that i create in the root of my module. When I explore the build directory that's where I can find my MyProjet.sln, a test/ folder, but no MyProjectTest.sln in it !

Answer 1

This may not solve your original problem but in your test/folder/CMakeLists.txt try changing

#ADD OUR TESTED LIBRARY
include_directories(../include)
link_directories(../build/lib/${CMAKE_BUILD_TYPE})

to

#ADD OUR TESTED LIBRARY
include_directories(${CMAKE_SOURCE_DIR}/include)
link_directories(${CMAKE_BINARY_DIR}/lib/${CMAKE_BUILD_TYPE})

otherwise you are assuming that your build folder is always named build.