test11 test11 - 15 days ago 5
C++ Question

Combining two solutions in one using cmake

I have two seperate Visual Studio 2013 solutions and I want to migrate them into one single solution since the first solution (using Qt) serves as the GUI for the second solution.

At the end I would like to have a single solution with a structure like this:



--Solution
-------All Build
-------Project 1
----------------External Dependencies
----------------header files
----------------Source files
-------Project 2
----------------External Dependencies
----------------header files
----------------Source files


The
CMakeLists.txt
for the first project is:

cmake_minimum_required(VERSION 2.8.5 FATAL_ERROR)
if(POLICY CMP0025)
cmake_policy(SET CMP0025 NEW) # CMake 3.0
endif()
if(POLICY CMP0053)
cmake_policy(SET CMP0053 NEW) # CMake 3.1
endif()

project (Project1)

set(CMAKE_MODULE_PATH
${CMAKE_SOURCE_DIR}/CMake
)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

find_package(OpenVR REQUIRED)
find_package(SDL2 REQUIRED)

include_directories(${OPENVR_INCLUDE_DIRS})
include_directories(${SDL2_INCLUDE_DIR})
include_directories(${CMAKE_SOURCE_DIR})

set(HEADER_FILES
...
)

set(CODE_FILES
...
)


# Copy the obj file to the build directory
file(COPY Data/***.*** DESTINATION ${PROJECT_BINARY_DIR}/Data)
file(COPY Data/***.*** DESTINATION ${PROJECT_BINARY_DIR}/Data)
file(COPY Data/***.*** DESTINATION ${PROJECT_BINARY_DIR}/Data)

#QT5_ADD_RESOURCES(visualization_RCS resources.qrc)

if(VTK_LIBRARIES)
add_executable(${PROJECT_NAME} ${CODE_FILES} ${HEADER_FILES})
target_link_libraries(${PROJECT_NAME} ${VTK_LIBRARIES} ${SDL2_LIBRARY})
else()
message("Specific Libs")
endif()


The
CMakeLists.txt
for the second project is:

cmake_minimum_required(VERSION 2.8.12)
project(Project2)
find_package(Qt5Widgets)
set(MyProjectLib_src ${PROJECT_SOURCE_DIR}/gui.cpp)
set(MyProjectLib_hdr ${PROJECT_SOURCE_DIR}/gui.h)
set(MyProjectLib_ui ${PROJECT_SOURCE_DIR}/gui.ui)
set(MyProjectBin_src ${PROJECT_SOURCE_DIR}/main.cpp)
qt5_wrap_cpp(MyProjectLib_hdr_moc ${MyProjectLib_hdr})
qt5_wrap_ui (MyProjectLib_ui_moc ${MyProjectLib_ui})
include_directories(${PROJECT_SOURCE_DIR})
include_directories(${PROJECT_BINARY_DIR})
add_library(MyProjectLib STATIC
${MyProjectLib_src}
${MyProjectLib_hdr_moc}
${MyProjectLib_ui_moc}
)
target_link_libraries(MyProjectLib Qt5::Widgets)
add_executable(MyProject ${MyProjectBin_src})
target_link_libraries(MyProject MyProjectLib)


The thing is that i am not able to combine the two
CMakeLists.txt
into one file. I am stock at this code since days

cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
if(POLICY CMP0025)
cmake_policy(SET CMP0025 NEW) # CMake 3.0
endif()
if(POLICY CMP0053)
cmake_policy(SET CMP0053 NEW) # CMake 3.1
endif()

project (project1)

set(CMAKE_MODULE_PATH
${CMAKE_SOURCE_DIR}/CMake
)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

find_package (Qt5Widgets REQUIRED)
find_package(OpenVR REQUIRED)
find_package(SDL2 REQUIRED)

include_directories(${OPENVR_INCLUDE_DIRS})
include_directories(${SDL2_INCLUDE_DIR})
include_directories(${CMAKE_SOURCE_DIR})

set(HEADER_FILES
GPU/header.h
...
...
)

set(CODE_FILES
GPU/sourcefile.cxx
...
)


#QT5_ADD_RESOURCES(visualization_RCS resources.qrc)
project (project2)


find_package (Qt5Widgets)


set (GuiLib_src Gui/gui.cpp)
set (GuiLib_hdr Gui/gui.h)
set (GuiLib_ui Gui/gui.ui)
set (GuiBin_src Gui/main.cpp)


qt5_wrap_cpp(GuiLib_hdr_moc ${GuiLib_hdr})
qt5_wrap_ui (GuiLib_ui_moc ${GuiLib_ui})


include_directories (${PROJECT_SOURCE_DIR})
include_directories (${PROJECT_BINARY_DIR})


add_library (GuiLib STATIC
${GuiLib_src}
${GuiLib_hdr_moc}
${GuiLib_ui_moc}
)
target_link_libraries (GuiLib Qt5::Widgets)



if(VTK_LIBRARIES)
add_executable(${PROJECT_NAME} ${CODE_FILES} ${HEADER_FILES})
target_link_libraries(${PROJECT_NAME} ${VTK_LIBRARIES} ${SDL2_LIBRARY}) #Qt5::Core Qt5::Gui
add_executable(Gui ${GuiBin_src})
target_link_libraries (Gui GuiLib)
else()
message("Specific Libs")
endif()


It is worth mentioning that
project1
is using VTK, OpenVR and SDL, while
project2
is just using Qt 5.

Answer

The easiest solution to satisfy the requirements you have outlined in the question is to introduce a new CMakeList file in Solution/CMakeLists.txt:

cmake_minimum_required(VERSION 2.8.12)
project(NameForTheCombinedProject)

add_subdirectory(path/to/project1/dir)
add_subdirectory(path/to/project2/dir)

In addition, you'll have to change all references to CMAKE_SOURCE_DIR and CMAKE_BINARY_DIR in the projects to CMAKE_CURRENT_SOURCE_DIR and CMAKE_CURRENT_BINARY_DIR, respectively. In particular, this affects the commands set(CMAKE_MODULE_PATH ...) and file(COPY ...) in Project 1.

The reason is that now CMAKE_SOURCE_DIRand CMAKE_BINARY_DIR will refer to the directories of the toplevel (newly created) project.