CUDA on Qt

  • Integrated .cpp and .cu files, giving errors like
    error: undefined reference to __imp__ZN16QCoreApplicationC1ERiPPci', error: undefined reference to__imp__ZN16QCoreApplication4execEv',
    error: undefined reference to __imp__ZN16QCoreApplicationD1Ev', error: undefined reference to__imp__ZN16QCoreApplicationD1Ev'
    in main.cpp file.

    I am using Qt Creator 4.0.3 , cuda 7.5 on windows 10(64 bit)

    I m uploading the .pro file here

         # project build directories
    DESTDIR     = ./
    #Enter your gencode here!
    GENCODE = arch=compute_52,code=sm_52
    # as I want to support 4.8 and 5 this will set a flag for some of the mac stuff
    # mainly in the types.h file for the setMacVisual which is native in Qt5
    isEqual(QT_MAJOR_VERSION, 5) {
            DEFINES +=QT5BUILD
    QT += core
    QT -= gui
    CONFIG += c++11
    TARGET = cuda-qt-integration
    CONFIG += console
    CONFIG -= app_bundle
    TEMPLATE = app
    VPATH += ./
    SOURCES += main.cpp
    INCLUDEPATH +=./include
        INCLUDEPATH+= /opt/local/include
        LIBS += -L/opt/local/lib -lGLEW
    #in on mac define DARWIN
        LIBS+= -lopengl32 #-lglew32s
        #LIBS+= -L"C:/Program Files (x86)/NVIDIA Corporation/Nsight Visual Studio Edition 4.7/Monitor/glew/lib" -lglew32s
    # basic compiler flags (not all appropriate for all platforms)
    QMAKE_CXXFLAGS+= -msse -msse2 -msse3
    # use this to suppress some warning from boost
    unix*:QMAKE_CXXFLAGS_WARN_ON += "-Wno-unused-parameter"
    #-------------------------Cuda setup-----------------------------
    #Enter your gencode here!
    GENCODE = arch=compute_52,code=sm_52
    #We must define this as we get some confilcs in minwindef.h and helper_math.h
    #set out cuda sources
    #This is to add our .cu files to our file browser in Qt
    # Path to cuda SDK install
    macx:CUDA_DIR = /Developer/NVIDIA/CUDA-6.5
    linux:CUDA_DIR = /usr/local/cuda-6.5
    win32:CUDA_DIR = "C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v7.5"
    # Path to cuda toolkit install
    macx:CUDA_SDK = /Developer/NVIDIA/CUDA-6.5/samples
    linux:CUDA_SDK = /usr/local/cuda-6.5/samples
    win32:CUDA_SDK = "C:/ProgramData/NVIDIA Corporation/CUDA Samples/v7.5"
    #Cuda include paths
    INCLUDEPATH += $$CUDA_DIR/include
    #INCLUDEPATH += $$CUDA_DIR/common/inc/
    #INCLUDEPATH += $$CUDA_DIR/../shared/inc/
    #To get some prewritten helper functions from NVIDIA
    win32:INCLUDEPATH += $$CUDA_SDK/common/inc
    #cuda libs
    macx:QMAKE_LIBDIR += $$CUDA_DIR/lib
    linux:QMAKE_LIBDIR += $$CUDA_DIR/lib64
    win32:QMAKE_LIBDIR += $$CUDA_DIR/lib/x64
    linux|macx:QMAKE_LIBDIR += $$CUDA_SDK/common/lib
    win32:QMAKE_LIBDIR +=$$CUDA_SDK/common/lib/x64
    LIBS += -lcudart -lcudadevrt -lcuda
    # join the includes in a line
    CUDA_INC = $$join(INCLUDEPATH,'" -I"','-I"','"')
    # nvcc flags (ptxas option verbose is always useful)
    NVCCFLAGS = --compiler-options  -fno-strict-aliasing --ptxas-options=-v -maxrregcount 20 --use_fast_math
    #On windows we must define if we are in debug mode or not
    CONFIG(debug, debug|release) {
        # MSVCRT link option (static or dynamic, it must be the same with your Qt SDK link option)
        win32:MSVCRT_LINK_FLAG_DEBUG = "/MDd"
        win32:NVCCFLAGS += -D_DEBUG -Xcompiler $$MSVCRT_LINK_FLAG_DEBUG
    #Release UNTESTED!!!
        win32:MSVCRT_LINK_FLAG_RELEASE = "/MD"
        win32:NVCCFLAGS += -Xcompiler $$MSVCRT_LINK_FLAG_RELEASE
    #prepare intermediat cuda compiler
    cudaIntr.input = CUDA_SOURCES
    cudaIntr.output = ${OBJECTS_DIR}${QMAKE_FILE_BASE}.o
    #So in windows object files have to be named with the .obj suffix instead of just .o
    #God I hate you windows!!
    win32:cudaIntr.output = $$OBJECTS_DIR/${QMAKE_FILE_BASE}.obj
    ## Tweak arch according to your hw's compute capability
    cudaIntr.commands = $$CUDA_DIR/bin/nvcc -m64 -g -gencode $$GENCODE -dc $$NVCCFLAGS $$CUDA_INC $$LIBS ${QMAKE_FILE_NAME} -o ${QMAKE_FILE_OUT}
    #Set our variable out. These obj files need to be used to create the link obj file
    #and used in our final gcc compilation
    cudaIntr.variable_out = CUDA_OBJ
    cudaIntr.variable_out += OBJECTS
    cudaIntr.clean = cudaIntrObj/*.o
    win32:cudaIntr.clean = cudaIntrObj/*.obj
    # Prepare the linking compiler step
    cuda.input = CUDA_OBJ
    cuda.output = ${QMAKE_FILE_BASE}_link.o
    win32:cuda.output = ${QMAKE_FILE_BASE}_link.obj
    # Tweak arch according to your hw's compute capability
    cuda.commands = $$CUDA_DIR/bin/nvcc -m64 -g -gencode $$GENCODE  -dlink    ${QMAKE_FILE_NAME} -o ${QMAKE_FILE_OUT}
    cuda.dependency_type = TYPE_C
    cuda.depend_command = $$CUDA_DIR/bin/nvcc -g -M $$CUDA_INC $$NVCCFLAGS   ${QMAKE_FILE_NAME}
    # Tell Qt that we want add more stuff to the Makefile

    please help me to sort out the issue


  • Hi @Maithri ,

    error: undefined reference to __imp__ZN16QCoreApplicationC1ERiPPci', error: undefined reference to__imp__ZN16QCoreApplication4execEv',

    AFAIK, this is because of using the different bit version. You might be using 32 bit version to build 64 bit application. Please check the versions.

  • @Ni.Sumi said in CUDA on Qt:

    64 bit application

    thanks @Ni-Sumi ,
    I ll check it

  • I Changed it to 64 bit version, now I am facing problem with
    **error: file not recognized: File format not recognized ** for cuda object(.obj) file

  • @Maithri

    Clean and re-built once. It might help. And re-check the paths given.

  • For this error:
    **error: file not recognized: File format not recognized ** for cuda object(.obj) file

    Change the include path and lib path to following style and delete the build folder and .pro.user file, rebuild:

    INCLUDEPATH +="C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v7.5/include"

    macx:QMAKE_LIBDIR += "C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v7.5/lib"
    linux:QMAKE_LIBDIR += "C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v7.5/lib64"
    win32:QMAKE_LIBDIR += "C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v7.5/lib/x64"

    I met similar problem in win 7, not sure about win 10.

  • Thanks Ni.Sumi & lilyofvalley,
    but nothing worked for me, still the same problem is coming.

  • These are the settings in my .pro file with win 7. I don't have win 10.
    For your reference:

    # CUDA with Windows
        #CUDA_DIR = "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7.5"
        CUDA_DIR = "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0"
        SYSTEM_NAME = x64         # Depending on your system either 'Win32', 'x64', or 'Win64'
        SYSTEM_TYPE = 64            # '32' or '64', depending on your system
        CUDA_ARCH = sm_52           # Type of CUDA architecture, for example 'compute_10', 'compute_11', 'sm_10'
        NVCC_OPTIONS = --use_fast_math # default setting
        #include paths
        #INCLUDEPATH += $$CUDA_DIR\include
        #INCLUDEPATH += "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7.5\include"
        INCLUDEPATH += "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\include"
        #library directories
        #QMAKE_LIBDIR += $$join(CUDA_DIR,'" -I"','-I"','"')\lib\$$SYSTEM_NAME
        #QMAKE_LIBDIR += "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v7.5\lib\x64"
        QMAKE_LIBDIR += "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\lib\x64"
        CUDA_LIBS = -lcuda -lcudart -lcufft
        CUDA_INC += $$join(INCLUDEPATH,'" -I"','-I"','"')
        LIBS += $$CUDA_LIBS
        # MSVCRT link option (static or dynamic, it must be the same with your Qt SDK link option)
        CONFIG(debug, debug|release){
            cuda_d.input    = CUDA_SOURCES
            cuda_d.output   = ${QMAKE_FILE_BASE}_cuda.obj
            cuda_d.commands = $$CUDA_DIR/bin/nvcc.exe -D_DEBUG $$NVCC_OPTIONS $$CUDA_INC $$LIBS \
                            --machine $$SYSTEM_TYPE -arch=$$CUDA_ARCH \
                            --compile -cudart static -g -DWIN32 -D_MBCS \
                            -Xcompiler "/wd4819,/EHsc,/W3,/nologo,/Od,/Zi,/RTC1" \
                            -Xcompiler $$MSVCRT_LINK_FLAG_DEBUG \
                            -c -o ${QMAKE_FILE_OUT} ${QMAKE_FILE_NAME}
            cuda_d.dependency_type = TYPE_C
            QMAKE_EXTRA_COMPILERS += cuda_d
        else {
            # Release settings
            cuda.input    = CUDA_SOURCES
            cuda.output   = ${QMAKE_FILE_BASE}_cuda.obj
            cuda.commands = $$CUDA_DIR/bin/nvcc.exe $$NVCC_OPTIONS $$CUDA_INC $$LIBS \
                            --machine $$SYSTEM_TYPE -arch=$$CUDA_ARCH \
                            --compile -cudart static -DWIN32 -D_MBCS \
                            -Xcompiler "/wd4819,/EHsc,/W3,/nologo,/O2,/Zi" \
                            -Xcompiler $$MSVCRT_LINK_FLAG_RELEASE \
                            -c -o ${QMAKE_FILE_OUT} ${QMAKE_FILE_NAME}
            cuda.dependency_type = TYPE_C
            QMAKE_EXTRA_COMPILERS += cuda

  • Thanks for the support,

    Compilation problems got solved, now getting run time error

    D:\maithri_MODD\CUDA_QT_5.7\build-cuda-qt-integration-GCC-Debug\cuda-qt-integration.exe exited with code -1073741515

  • Qt Champions 2016

    @Maithri said in CUDA on Qt:

    exited with code -1073741515

    If you start in debug mode and place breakpoint at main()

    Do you get to the BP before the error ?

    or does error just comes at once and main never reached?

  • @mrjj

    if I run it in debug mode, it's not reaching breakpoint and giving some other error.
    I have attached error msg and main.cpp code
    alt text
    alt text


    [Fixed images' URLs ~kshegunov]

  • Qt Champions 2016

    Super but picture upload is broken here and I cant see it.
    Can you please use external site and post links here.

    Oh you did, for some reason they are not shown.

    I am not huge Visual Studio user but this error
    -1073741515 == 0xC0000135
    and that should mean STATUS_DLL_NOT_FOUND

    So maybe it needs some Dlls it cant find? Maybe some cuda ones?
    If you have an idea which one it could be, then try copy them to the build folder next to the exe and try to
    run again ( from editor) (Double clicking on EXE is 100% other matter so please dont do that)

    Alternatively, download

    It shows which dlls it will try to load and from where. that can also give hints.
    So you will simply install it and open the .exe in it. it then shows all all it uses.
    This tool is a bit confusing at first but gives great insight in what dlls being needed.

  • Qt Champions 2016


    My best guess would it just wants some DLLS from cuda.
    Something like
    Projects- > Build & Run" tab
    "Run Settings" (chosen in the "Kit") For you is VS 64 bit !
    "Run Environment" > "Details" > PATH

    and see if it has paths to where cuda DLLS are. ( if such exists :)

  • hi @mrjj ,

    using the dependency walker figer out that the .exe file depends on so many dll files, I have given the path for the available dll's but still the problem exist .

    Following are some of dll's which are not available in the system,

  • Qt Champions 2016


    Those are normal. Shown as missing most of the time-
    I was more after some CUDA dlls or something it need for this project.

    Also click on those CUDA dlls it have and see if those have indirectly a need for a dll it cant find.

  • @Maithri said in CUDA on Qt:

    main.cpp and error message

    In addition to Mr. @mrjj .

    Usually, this debug error is caused due to mismatach of the bit version. Earlier , even I have faced the same problem . Please check that you are using the right cdb.exe (32 bit or 64 bit). Check here to configure the debug

    CDB Process terminated unexpectedly

    you can find your 64 bit path of cdb here (Win10)

    C:\Program Files (x86)\Windows Kits\8.1\Debuggers\x64\cdb.exe

    If still, does not run, check all the required dll's you have them or not. (not the general windows dll's).

    Does it run fine in release mode ?

  • @Ni.Sumi

    i am using 64bit cdb.
    its running fine in release mode.


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