I am trying to compile a project that has only one main function, but CMake find more.
My CMakeLists.txt is like:
cmake_minimum_required(VERSION 2.8)
project(my_proj)
include_directories(".")
add_subdirectory(main)
add_subdirectory(resources)
find_package(OpenCV REQUIRED)
find_package(Boost REQUIRED COMPONENTS system regex program_options)
include_directories(${Boost_INCLUDE_DIRS})
file(GLOB_RECURSE SRC_FILES ${PROJECT_SOURCE_DIR}/*.cpp)
file(GLOB_RECURSE HDR_FILES ${PROJECT_SOURCE_DIR}/*.hpp)
add_executable(my_proj ${SRC_FILES} ${HDR_FILES})
target_link_libraries(my_proj ${OpenCV_LIBS})
target_link_libraries(my_proj ${OpenCV_LIBS}
${Boost_PROGRAM_OPTIONS_LIBRARY}
${Boost_REGEX_LIBRARY}
${Boost_FILESYSTEM_LIBRARY}
${Boost_SYSTEM_LIBRARY})
I have more folders with .hpp and .cpp files that is why I have added file(GLOB_RECURSE... statements and also include_directories(".").
I get an error after it compiles all files that says:
CMakeFiles/my_proj.dir/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp.o: In function `main':
/media/N/my_proj/build/CMakeFiles/CompilerIdCXX/CMakeCXXCompilerId.cpp:209: multiple definition of `main'
CMakeFiles/my_proj.dir/main.cpp.o:/media/N/my_proj/main.cpp:10: first defined here
CMakeFiles/my_proj.dir/main/solution2/sources/CRunSolution2.cpp.o: In function `boost::filesystem3::path::codecvt()':
/usr/include/boost/filesystem/v3/path.hpp:377: undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
Has anyone met something like that? If yes, how to fix it?
In your executable you simply have 2 main functions (print out SRC_FILES by MESSAGE(${SRC_FILES})). One is in main.cpp and one in CMakeCXXCompilerId.cpp (which is a file that CMake generates to test if your CXX compiler works correctly). The GLOB_RECURSE probably finds and adds both of these files to SRC_FILES
Using FILE(GLOB ...) is tricky:
We do not recommend using GLOB to collect a list of source files from your source tree. If no CMakeLists.txt file changes when a source is added or removed then the generated build system cannot know when to ask CMake to regenerate.
You should list your source and header files in your CMakeLists.txt directly
Related
I have code with one big directory of models which are going to be used in two binaries - the main program and tests. I want to put the models to the library which will compile once and then both main program and tests can use it without recompiling it again.
Here are my current directories:
root/
CMakeLists.cpp
src/
CMakeLists.txt
main.cpp
model/
/*a lot of cpp/hpp files*/
impl/
impl.cpp
impl.hpp (uses models)
test/
CMakeLists.txt
main.cpp
test.cpp (uses models and impl)
root/CMakeLists.txt
cmake_minimum_required(VERSION 3.10)
project(server)
set(CMAKE_CXX_STANDARD 14)
file(GLOB MODEL_SOURCES "src/model/*.cpp")
add_library(modelLibrary ${MODEL_SOURCES})
add_subdirectory(src)
add_subdirectory(test)
src/CMakeLists.txt
set(BINARY ${CMAKE_PROJECT_NAME})
file(GLOB_RECURSE SOURCES LIST_DIRECTORIES true *.h *.cpp)
set(SOURCES ${SOURCES})
add_executable(${BINARY} ${SOURCES})
include_directories(impl)
# can't see model files without this line
target_include_directories(${BINARY} PRIVATE ./model)
target_link_libraries(${BINARY} PUBLIC modelLibrary pistache pthread ssl crypto)
test/CMakeLists.txt
set(BINARY ${CMAKE_PROJECT_NAME}_test)
file(GLOB_RECURSE TEST_SOURCES LIST_DIRECTORIES false *.hpp *.cpp)
set(SOURCES ${TEST_SOURCES})
add_executable(${BINARY} ${TEST_SOURCES})
add_test(NAME ${BINARY} COMMAND ${BINARY})
# can't see model files without this line
target_include_directories(${BINARY} PRIVATE ../src/model)
target_link_libraries(${BINARY} modelLibrary gtest gtest_main pthread)
I have failed with using modelLibrary as only source. It still compiles the models two times. I'd like to achieve solution where models are compiled once and they are reachable from both - main program and test.
I believe the reason you see the model files compiled twice is due to the recursive glob in src/CMakeLists.txt.
file(GLOB_RECURSE SOURCES LIST_DIRECTORIES true *.h *.cpp)
This recursive glob will also walk into src/model and grab the *.cpp files there. So the model files are getting compiled as part of modelLibrary as well as part of the server executable.
One way to fix this would be to remove the recursive glob and create a separate CMakeLists.txt in src/model with the contents of:
# I wouldn't actually glob, see note below.
file(GLOB MODEL_SOURCES "*.cpp")
add_library(modelLibrary ${MODEL_SOURCES})
target_include_directories(modelLibrary PUBLIC ".")
One would need to make a call add_subdirectory() for this new CMakeLists in either the root or the src/CMakeLists.txt.
Notice the use of target_include_directories in the possible solution. I put that there as I noticed it was being repeated in the test and executable. Using PUBLIC on modelLibrary means that consumers get the include directory just by using target_link_libraries.
Note about globbing: from CMake docs on GLOB
Note We do not recommend using GLOB to collect a list of source files from your source tree. If no CMakeLists.txt file changes when a source is added or removed then the generated build system cannot know when to ask CMake to regenerate. The CONFIGURE_DEPENDS flag may not work reliably on all generators, or if a new generator is added in the future that cannot support it, projects using it will be stuck. Even if CONFIGURE_DEPENDS works reliably, there is still a cost to perform the check on every rebuild.
That note can be a bit hard to grok, but try to fully understand the consequences if you do decide to glob.
My program includes a subdirectory, because a header and a source file are there which are needed. My project looks like this:
EDIT: Perhaps I didn't specify: my goal is to link frame_cap.cpp to the header grab_cut.h, as I require its functions.
[-] raspicam
| [-] main_folder
| frame_cap.cpp
| CMakeLists.txt
| [-] opencv-plus
| grab_cut.cpp
| grab_cut.h
| CMakeLists.txt
Now, I have already linked the two using the CMakeLists.txt in main_folder. It looks as follows:
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
PROJECT(frame_cap)
SET(OpenCVPLUS_DIR "/home/pi/Desktop/raspicam/main_folder/opencv-plus")
FIND_PACKAGE( OpenCV REQUIRED )
SET(OpenCV_PACKAGE ${OpenCV_LIBRARIES})
INCLUDE_DIRECTORIES( ${OpenCV_INCLUDE_DIRS} )
INCLUDE_DIRECTORIES(${OpenCVPLUS_DIR})
LINK_DIRECTORIES(${OpenCVPLUS_DIR})
ADD_SUBDIRECTORY(${OpenCVPLUS_DIR})
ADD_EXECUTABLE( frame_cap frame_cap.cpp )
TARGET_LINK_LIBRARIES( frame_cap ${OpenCV_LIBS} ${OpenCVPLUS_DIR})
As you can see, OpenCVPLUS_DIR is, well, the opencv-plus directory, where both the header and source file are located. The CMakeLists.txt file in the opencv-plus folder looks as follows:
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
PROJECT(grab_cut)
SET(OpenCVPLUS_DIR "/home/pi/Desktop/raspicam/main_folder/opencv-plus")
FIND_PACKAGE(OpenCV REQUIRED)
INCLUDE_DIRECTORIES(${OpenCV_INCLUDE_DIRS})
SET(SOURCES grab_cut.cpp ${OpenCVPLUS_DIR}/grab_cut.h)
ADD_EXECUTABLE(grab_cut grab_cut.cpp ${SOURCES})
TARGET_LINK_LIBRARIES(grab_cut ${OpenCV_LIBS})
Finally, this is the exact error I get:
[ 25%] Linking CXX executable frame_cap
/usr/bin/ld: cannot find -lraspicam/main_folder/opencv-plus/
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/frame_cap.dir/build.make:102: frame_cap] Error 1
make[1]: *** [CMakeFiles/Makefile2:73: CMakeFiles/frame_cap.dir/all] Error 2
make: *** [Makefile:84: all] Error 2
I'd be happy to hear your suggestions as I'm a newbie at CMake and am not really sure what I'm doing wrong.
The error:
/usr/bin/ld: cannot find -lraspicam/main_folder/opencv-plus/
occurs because you try to link a directory to your frame_cap executable here:
TARGET_LINK_LIBRARIES( frame_cap ${OpenCV_LIBS} ${OpenCVPLUS_DIR})
This doesn't make sense; only libraries should be linked to your executable.
From your comments, it sounds like you want to build two executables, but use the grab_cut functions in both. This is certainly achievable with CMake. But you appear to have a design problem, because compiling the grab_cut.cpp file with the frame_cap executable will probably cause issues, assuming both files contain a main function. You'll need to split the main function into a separate file (say, main.cpp), then you can include grab_cut.cpp in the compilation of both executables.
BTW, you can use CMAKE_CURRENT_LIST_DIR to refer to the directory of the current CMakeLists.txt file, so there is no need to list out directories in your source-tree explicitly. Also, I pray you are using a newer CMake than version 2.8. Some of the steps in your CMake files seemed unnecessary, so here are the simplified files that might work for you.
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
PROJECT(frame_cap)
# There is no need to spell out this directory since it exists
# in the source-tree already.
SET(OpenCVPLUS_DIR "/home/pi/Desktop/raspicam/main_folder/opencv-plus")
FIND_PACKAGE( OpenCV REQUIRED )
# Seems unused, remove it.
SET(OpenCV_PACKAGE ${OpenCV_LIBRARIES})
# Include the OpenCV and opencv-plus headers in this executable.
INCLUDE_DIRECTORIES(${OpenCV_INCLUDE_DIRS} ${CMAKE_CURRENT_LIST_DIR}/opencv-plus)
# There is no library to link from this directory, so we don't need this call.
LINK_DIRECTORIES(${OpenCVPLUS_DIR})
ADD_SUBDIRECTORY(opencv-plus)
# Add the grap_cut.cpp file to the frame_cap executable.
ADD_EXECUTABLE( frame_cap frame_cap.cpp opencv-plus/grab_cut.cpp)
# We don't link anything from opencv-plus, we compiling it directly.
TARGET_LINK_LIBRARIES( frame_cap ${OpenCV_LIBS} ${OpenCVPLUS_DIR})
And your opencv-plus/CMakeLists.txt file can be simplified to something like this:
# If this CMake file is always called as part of the top-level CMake
# file, don't need this.
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
PROJECT(grab_cut)
# Don't need this, as explained earlier.
SET(OpenCVPLUS_DIR "/home/pi/Desktop/raspicam/main_folder/opencv-plus")
# The top-level CMake file already found OpenCV, so the variables
# we need are already defined.
FIND_PACKAGE(OpenCV REQUIRED)
# The include directories get initialized from the parent CMake file, so no need
# for this call if the include directories are the same for both executables.
INCLUDE_DIRECTORIES(${OpenCV_INCLUDE_DIRS})
# Separate 'main' function into separate file, and add it here.
SET(SOURCES grab_cut.cpp grab_cut.h main.cpp)
# Don't need to add 'grab_cut.cpp' to the executable twice! It was
# already added using the 'SOURCES' variable.
ADD_EXECUTABLE(grab_cut grab_cut.cpp ${SOURCES})
TARGET_LINK_LIBRARIES(grab_cut ${OpenCV_LIBS})
I have a list of object files generated by a Makefile stored under say mylib directory. I am trying to link these object files while compiling one of the sub-directories in my project (I don't want to generate an executable). Here is my CMakeLists.txt file
cmake_minimum_required(VERSION 3.5.1)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED on)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -g")
set( CMAKE_EXPORT_COMPILE_COMMANDS ON )
file(GLOB SOURCES "*.cpp" ".hpp")
include_directories(mylib)
link_directories(${CMAKE_CURRENT_SOURCE_DIR}/mylib)
add_library(slib SHARED ${SOURCES})
That is, mylib directory contains .h, .cc and .o files I generated after running make on mylib.
When I try to compile this, I get an Undefined symbols for architecture x86_64 error for mylib functions.
How can I link multiple precompiled object files generated by an external make? This question (how to add prebuilt object files to executable in cmake) gives a method to link a single object file. How do I do this for all the object files and generated a shared library instead of an executable?
I suggest to compile library "mylib" with ExternalProject (by direct call to gcc, for example) and, then use code like this:
add_library (slib SHARED ${SOURCES})
target_link_libraries (slib "mylib")
add_dependencies may be useful in some cases.
I have the following CMakeLists file:
cmake_minimum_required(VERSION 2.6 FATAL_ERROR)
project(PointCloudComparator)
find_package(PCL 1.7 REQUIRED COMPONENTS common io)
set(PCL_DIR "/usr/share/pcl-1.7/PCLConfig.cmake")
set(PCL_INCLUDE_DIRS "/usr/include/pcl-1.7")
set(PCL_LIBRARY_DIRS "/usr/lib/")
include_directories(${PCL_INCLUDE_DIRS} "/usr/include/eigen3" "include")
link_directories(${PCL_LIBRARY_DIRS})
add_definitions(${PCL_DEFINITIONS})
add_executable (segmentator src/segmentation.cpp include/segmentation.h)
target_link_libraries (segmentator ${PCL_LIBRARIES}
${PCL_COMMON_LIBRARIES} ${PCL_IO_LIBRARIES}
"/usr/lib/libpcl_visualization.so" "/usr/lib/libpcl_keypoints.so"
"/usr/lib/libpcl_features.so" "/usr/lib/libpcl_kdtree.so"
"/usr/lib/libpcl_search.so" "/usr/lib/libpcl_filters.so"
"/usr/lib/libpcl_segmentation.so"
"/usr/lib/libpcl_sample_consensus.so")
add_executable (comparator src/comparator.cpp include/comparator.h
include/segmentation.h)
target_link_libraries (comparator ${PCL_LIBRARIES}
${PCL_COMMON_LIBRARIES}
${PCL_IO_LIBRARIES} "/usr/lib/libpcl_visualization.so"
"/usr/lib/libpcl_keypoints.so" "/usr/lib/libpcl_features.so"
"/usr/lib/libpcl_kdtree.so" "/usr/lib/libpcl_search.so"
"/usr/lib/libpcl_filters.so" "/usr/lib/libpcl_segmentation.so"
"/usr/lib/libpcl_sample_consensus.so")
But, when I try to compile my code, I get the error:
CMakeFiles/comparator.dir/src/comparator.cpp.o: In function `main':
comparator.cpp:(.text+0x3313): reference to
`region_growing_segmentation(std::string)' not defined
collect2: error: ld returned 1 exit status
region_growing_segmentation(std::string) is a function declared in segmentation.h and defined in segmentation.cpp. Eclipse actually knows where the function is but when I try to run make it just simply cant find it. Any ideas?
Regards
You are building two separate executables (segmentator and comparator). Each executable is made from one single source file and one single header file. That is what you say with the add_executable commands. The source files used by a single add_executable command is not shared with any other executable target you create.
If you have common code that should be shared between the two programs, then you should put it in a separate source file that you add to each executable (add the new common source file to the add_executable command). Or create a library target that is linked with the two executables.
I'm having trouble compiling my application using cmake and make. The source files of the project are organized as follows:
SOURCE/
CMakeLists.txt
myApp.cc
include/
classA.hh
classB.hh
src/
classA.cc
classB.cc
classB.cu
My CMakeLists.txt file is as follows:
CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
PROJECT(myApp)
FIND_PACKAGE(VTK REQUIRED)
INCLUDE(${VTK_USE_FILE})
FIND_PACKAGE(GDCM REQUIRED)
IF(GDCM_FOUND)
INCLUDE(${GDCM_USE_FILE})
SET(GDCM_LIBRARIES gdcmCommon vtkgdcm)
ELSE(GDCM_FOUND)
MESSAGE(FATAL_ERROR "Cannot find GDCM, did you set GDCM_DIR?")
ENDIF(GDCM_FOUND)
SET(CUDA_TOOLKIT_ROOT_DIR="/Developer/NVIDIA/CUDA-7.5/")
FIND_PACKAGE(CUDA REQUIRED)
SET(CUDA_PROPAGATE_HOST_FLAGS ON)
SET(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS} -gencode arch=compute_30,code=sm_30)
SET(LIB_TYPE SHARED)
SET(CUDA_SEPARABLE_COMPILATION ON)
LINK_DIRECTORIES(/lib/FFTW/INSTALL/lib)
INCLUDE_DIRECTORIES(/lib/FFTW/INSTALL/include)
INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR}/include)
FILE(GLOB headers ${PROJECT_SOURCE_DIR}/include/*.hh)
FILE(GLOB sources ${PROJECT_SOURCE_DIR}/src/*.cc)
FILE(GLOB cudafile ${PROJECT_SOURCE_DIR}/src/*.cu)
CUDA_ADD_EXECUTABLE(myApp myApp ${headers} ${sources} ${cudafile})
TARGET_LINK_LIBRARIES(myApp ${VTK_LIBRARIES} ${GDCM_LIBRARIES} fftw3)
When I try to compile the project using make (after successfully running cmake) I get:
nvcc fatal : A single input file is required for a non-link phase when an outputfile is specified
CMake Error at myApp_generated_classB.cu.o.cmake:207 (message):
Error generating
../BUILD/CMakeFiles/myApp.dir/src/./myApp_generated_classB.cu.o
Is breaking up the source file of a class into .cc and .cu files problematic?
This is not a comprehensive explanation of what exactly causes the problem stated in the question; nevertheless it solves the problem in a fairly satisfactory way.
First, apparently there is a conflict between using FIND_PACKAGE(VTK) (and hence FIND_PACKAGE(GDCM) which seems to require VTK CMake files for vtkgdcm) and nvcc. This has been recently reported on Mantis. To avoid this conflict, I use:
LINK_DIRECTORIES( {VTK_Directory}/INSTALL/lib)
INCLUDE_DIRECTORIES({VTK_Directory}/INSTALL/include/vtk-6.2)
LINK_DIRECTORIES( {GDCM_Directory}/INSTALL/lib)
INCLUDE_DIRECTORIES({GDCM_Directory}/INSTALL/include/gdcm-2.4)
instead of,
FIND_PACKAGE(VTK REQUIRED)
FIND_PACKAGE(GDCM REQUIRED)
Second, as for the CUDA part of the project, I put everything into a .cu file and use CUDA_COMPILE(cuda_o myCUDAstudff.cu) to create an object file. Then I use the native C++ compiler to create an executable as usual using ADD_EXECUTABLE( ... ${cuda_o}). Since I am using the native C++ compiler as opposed to nvcc, I need to include the following header files in my kernel (myCUDAstudff.cu) file:
#include <cuda.h>
#include <cuda_runtime.h>
and also link to libcudart in TARGET_LINK_LIBRARIES(), for which I used the shared library. I couldn't figure out a way to do the same with libcudart_static.a though.
Alternatively, one can use CUDA_ADD_EXECUTABLE(... myCUDAstudff.cu) instead of all the above steps (i.e., CUDA_COMPILE(), ADD_EXECUTABLE(),...).