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problems with gcc-versions when compiling c++ code.

  • I am not sure if this is a cuda issue or a qmake/qtcreator config issue but here is the output.

    12:06:16: Running steps for project SuperRes...
    12:06:16: Configuration unchanged, skipping qmake step.
    12:06:16: Starting: "/usr/bin/make" 
    Makefile:3001: warning: overriding recipe for target 'moc_mainviewer.cpp'
    Makefile:2501: warning: ignoring old recipe for target 'moc_mainviewer.cpp'
    Makefile:3221: warning: overriding recipe for target 'moc_mainwindow.cpp'
    Makefile:2390: warning: ignoring old recipe for target 'moc_mainwindow.cpp'
    Makefile:3679: warning: overriding recipe for target 'ui_mainwindow.h'
    Makefile:3675: warning: ignoring old recipe for target 'ui_mainwindow.h'
    Makefile:4638: warning: overriding recipe for target '../SuperRes/Obj/main.o'
    Makefile:3867: warning: ignoring old recipe for target '../SuperRes/Obj/main.o'
    Makefile:5295: warning: overriding recipe for target '../SuperRes/Obj/mainwindow.o'
    Makefile:3994: warning: ignoring old recipe for target '../SuperRes/Obj/mainwindow.o'
    /usr/local/cuda-9.1//bin/nvcc -m64 -O3 -c --compiler-options -fno-strict-aliasing -use_fast_math --ptxas-options=-v -DCMAKE_C_COMPILER=/usr/bin/gcc-5 -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 -DCMAKE_C_COMPILER=/usr/bin/gcc-5 -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 -I/usr/local/cuda-9.1/include/ -I/usr/local/cuda-9.1/include/  -L/usr/local/cuda-9.1/lib64/ -lcuda -lcudart -L/usr/local/cuda-9.1/lib64/ -lcudart -lcuda ../SuperRes/ -o ../SuperRes/Obj/Filter_cuda.o 2>&1 | sed -r "s/\(([0-9]+)\)/:\1/g" 1>&2
    In file included from /usr/local/cuda-9.1/include/host_config.h:50:0,
                     from /usr/local/cuda-9.1/include/cuda_runtime.h:78,
                     from <command-line>:0:
    /usr/local/cuda-9.1/include/crt/host_config.h:121:2: error: #error -- unsupported GNU version! gcc versions later than 6 are not supported!
     #error -- unsupported GNU version! gcc versions later than 6 are not supported!
    /usr/local/cuda-9.1//bin/nvcc -m64 -O3 -c --compiler-options -fno-strict-aliasing -use_fast_math --ptxas-options=-v -DCMAKE_C_COMPILER=/usr/bin/gcc-5 -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 -DCMAKE_C_COMPILER=/usr/bin/gcc-5 -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 -I/usr/local/cuda-9.1/include/ -I/usr/local/cuda-9.1/include/  -L/usr/local/cuda-9.1/lib64/ -lcuda -lcudart -L/usr/local/cuda-9.1/lib64/ -lcudart -lcuda ../SuperRes/ -o ../SuperRes/Obj/SuperResolutionKernel_cuda.o 2>&1 | sed -r "s/\(([0-9]+)\)/:\1/g" 1>&2
    In file included from /usr/local/cuda-9.1/include/host_config.h:50:0,
                     from /usr/local/cuda-9.1/include/cuda_runtime.h:78,
                     from <command-line>:0:
    /usr/local/cuda-9.1/include/crt/host_config.h:121:2: error: #error -- unsupported GNU version! gcc versions later than 6 are not supported!
     #error -- unsupported GNU version! gcc versions later than 6 are not supported!
    /usr/local/cuda-9.1//bin/nvcc -D_DEBUG --use_fast_math -DCMAKE_C_COMPILER=/usr/bin/gcc-5 -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 -I/usr/local/cuda-9.1/include/ -I/usr/local/cuda-9.1/include/  --machine 64 -c -o Filter_cuda.o ../SuperRes/
    In file included from /usr/local/cuda-9.1/include/host_config.h:50:0,
                     from /usr/local/cuda-9.1/include/cuda_runtime.h:78,
                     from <command-line>:0:
    /usr/local/cuda-9.1/include/crt/host_config.h:121:2: error: #error -- unsupported GNU version! gcc versions later than 6 are not supported!
     #error -- unsupported GNU version! gcc versions later than 6 are not supported!
    Makefile:2212: recipe for target 'Filter_cuda.o' failed
    make: *** [Filter_cuda.o] Error 1
    12:06:17: The process "/usr/bin/make" exited with code 2.
    Error while building/deploying project SuperRes (kit: Desktop Qt 5.11.0 GCC 64bit)
    When executing step "Make"
    12:06:17: Elapsed time: 00:00.

    I have tried the following:

    • changing the compiler in Tools>Options>Kits as in this screenshot.

      • alt text
      • I do get a warning saying
    :-1: warning: "/usr/bin/gcc-6" is used by qmake, but "/usr/bin/x86_64-linux-gnu-gcc-5" is configured in the kit.
    Please update your kit or choose a mkspec for qmake that matches your target environment better. 

    and likewise for G++ however as you can see it's just a different path. I actually went into the Qt mkspec files and changed it to gcc-5. I will go into detail about that next.

    • Changing the options in the Qt mkspec files.

      • I went into the "linux-g++-64" and "linux-g++" mkspec folders (liux-g++ is the one it said it uses by default but I manually set the kit to use linux-g++-64) and followed the included files and changed all the options to gcc-5 and g++-5 respectively. You can see that it worked in the warning above.
    • Changing options in my file

    # Project created by QtCreator 2018-06-01T16:27:25
    QT       += core \
                network \
                gui \
    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
    TARGET = SuperRes
    TEMPLATE = app
    # The following define makes your compiler emit warnings if you use
    # any feature of Qt which has been marked as deprecated (the exact warnings
    # depend on your compiler). Please consult the documentation of the
    # deprecated API in order to know how to port your code away from it.
    # You can also make your code fail to compile if you use deprecated APIs.
    # In order to do so, uncomment the following line.
    # You can also select to disable deprecated APIs only up to a certain version of Qt.
    #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
    SOURCES += \
            main.cpp \
            mainwindow.cpp \
        FileThread.cpp \
        ImageFloatViewer.cpp \
        ImageIntViewer.cpp \
        ImgRead.cpp \
        main.cpp \
        MainViewer.cpp \
        mainwindow.cpp \
        StatusViewer.cpp \
        Stopwatch.cpp \
        SuperResolution.cpp \
        SuperResolutionThread.cpp \
        SuperResolutionViewer.cpp \
    HEADERS += \
            mainwindow.h \
        mainviewer.h \
        statusdata.h \
        cudaError.h \
        cudaMath.h \
        FileThread.h \
        Filter.h \
        ImageFloatViewer.h \
        ImageHeader.h \
        ImageIntViewer.h \
        ImgRead.h \
        mainviewer.h \
        MainViewer.h \
        mainwindow.h \
        statusdata.h \
        StatusData.h \
        StatusViewer.h \
        Stopwatch.h \
        SuperResolution.h \
        SuperResolutionKernel.h \
        SuperResolutionThread.h \
        SuperResolutionViewer.h \
        UDPRead.h \
    FORMS += \
            mainwindow.ui \
    DISTFILES += \
        SuperResViewer.suo \ \ \
        SuperResViewer.sln \
        SuperResViewer.vcxproj \
        SuperResViewer.vcxproj.filters \
        SuperResViewer.vcxproj.user \ \ \ \
    SUBDIRS += \
    INCLUDEPATH += /usr/local/cuda-9.1/include/
    LIBS += -L"/usr/local/cuda-9.1/lib64/" -lcuda -lcudart
    #CONFIG += console
    #CONFIG -= app_bundle
    SYSTEM_TYPE = 64
    DESTDIR = $$system(pwd)
    # Path to cuda toolkit install
    CUDA_DIR      = /usr/local/cuda-9.1/
    # Path to header and libs files
    INCLUDEPATH += /usr/local/cuda-9.1/include/
    QMAKE_LIBDIR += /usr/local/cuda-9.1/lib64/    # Note I'm using a 64 bits Operating system
    # libs used in your code
    LIBS += -L"/usr/local/cuda-9.1/lib64/" -lcudart -lcuda
    # GPU architecture
    #CUDA_ARCH     = sm_21                # Yeah! I've a new device. Adjust with your compute capability
    # Here are some NVCC flags I've always used by default.
    NVCC_OPTIONS = --use_fast_math  -DCMAKE_C_COMPILER=/usr/bin/gcc-5  -DCMAKE_CXX_COMPILER=/usr/bin/g++-5
    NVCCFLAGS     = --compiler-options -fno-strict-aliasing -use_fast_math --ptxas-options=-v  -DCMAKE_C_COMPILER=/usr/bin/gcc-5  -DCMAKE_CXX_COMPILER=/usr/bin/g++-5
    # Prepare the extra compiler configuration (taken from the nvidia forum - i'm not an expert in this part)
    CUDA_INC = $$join(INCLUDEPATH,' -I','-I',' ')
    cuda.commands = $$CUDA_DIR/bin/nvcc -m64 -O3  -c $$NVCCFLAGS  -DCMAKE_C_COMPILER=/usr/bin/gcc-5  -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 \
                    $$CUDA_INC $$LIBS  ${QMAKE_FILE_NAME} -o ${QMAKE_FILE_OUT} \
                    2>&1 | sed -r \"s/\\(([0-9]+)\\)/:\\1/g\" 1>&2
    # nvcc error printout format ever so slightly different from gcc
    cuda.dependency_type = TYPE_C # there was a typo here. Thanks workmate!
    cuda.depend_command = $$CUDA_DIR/bin/nvcc -O3 -M $$CUDA_INC $$NVCCFLAGS  -DCMAKE_C_COMPILER=/usr/bin/gcc-5  -DCMAKE_CXX_COMPILER=/usr/bin/g++-5   ${QMAKE_FILE_NAME}
    cuda.input = CUDA_SOURCES
    cuda.output = ${OBJECTS_DIR}${QMAKE_FILE_BASE}_cuda.o
    # Tell Qt that we want add more stuff to the Makefile
    # SPECIFY THE R PATH FOR NVCC (this caused me a lot of trouble before)
    QMAKE_LFLAGS += -DCMAKE_C_COMPILER=/usr/bin/gcc-5  -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 -Wl,-rpath,/usr/local/cuda-9.1/lib64/ # <-- added this
    NVCCFLAGS =  -DCMAKE_C_COMPILER=/usr/bin/gcc-5  -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 -Xlinker -rpath,/usr/local/cuda-9.1/lib64/ # <-- and this
    CONFIG(debug, debug|release) {
        # Debug mode
        cuda_d.input = CUDA_SOURCES
        cuda_d.output = $$CUDA_OBJECTS_DIR/${QMAKE_FILE_BASE}_cuda.o
        cuda_d.commands = $$CUDA_DIR/bin/nvcc -D_DEBUG $$NVCC_OPTIONS $$CUDA_INC $$NVCC_LIBS --machine $$SYSTEM_TYPE  -c -o ${QMAKE_FILE_OUT} ${QMAKE_FILE_NAME}
        cuda_d.dependency_type = TYPE_C
        QMAKE_EXTRA_COMPILERS += cuda_d
    else {
        # Release mode
        cuda.input = CUDA_SOURCES
        cuda.output = $$CUDA_OBJECTS_DIR/${QMAKE_FILE_BASE}_cuda.o
        cuda.commands = $$CUDA_DIR/bin/nvcc $$NVCC_OPTIONS $$CUDA_INC $$NVCC_LIBS --machine $$SYSTEM_TYPE -arch=$$CUDA_ARCH -c -o ${QMAKE_FILE_OUT} ${QMAKE_FILE_NAME}
        cuda.dependency_type = TYPE_C

    I added -DCMAKE_CXX_COMPILER=/usr/bin/g++-5 and -DCMAKE_CXX_COMPILER=/usr/bin/gcc-5 wherever I could be it the NVCC flags or qmake options. I just put it wherever I could and it hasn't raised any extra warnings or errors so I can't imagine it's doing any harm but it's definitely not fixing the errors.


    I was trying this with GCC/G++ 6 when I had 7 enabled first then I tried gcc/g++ 5 because I thought maybe it meant anything above 6.0 so 6.4.0 would also be bad. Again i do not know exactly what the cause of this is. I know it's coming from cuda not being compatible with GCC but I don't know if qt-creator might be what is setting the GCC version here. Thanks for your time.


    I wasn't sure what part of the forum to post this in. I thought General and Desktop might be appropriate.

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    What Linux distribution are you running ?

  • Ok I just wasn't google searching the right phrases. This, at least, seems to fix the issue. Once I have successfully compiled the program I will delete this post or mark as a duplicate respecitvely.

  • Lifetime Qt Champion

    No reason to delete this post.

    That will make the solution even more visible :)

  • @SGaist alright will do.

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