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Problem building qtbase from source

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  • Tom assoT Tom asso

    @SGaist Thanks again SGaist - my apologies for all the questions, but is the procedure for building sources that come from the downloaded .run file (e.g qt-opensource-linux-x64-5.14.2.run) documented somewhere? As you suggest, I now run ./configure (instead of qmake directly), but still have problems.

    When I execute qt-opensource-linux-x64-5.14.2.run on my ubuntu 18.04 system, it places files including sources and shared libraries in $HOME/Qt5.14.2.. I can link my application with the shared libraries in $HOME/Qt5.14.2/5.14.2/gcc_64/

    Now I want to modify some source files in Qt5.14.2 qtbase

    % cd 5.14.2/Src/qtbase
    % ./configure   # builds (and runs?) qmake, generates Makefile
    

    Now if I run ‘make’ it successfully runs to completion. If I modify a qtbase source file and run ‘make’ again, it successfully builds. However ‘make’ rebuilds the libraries in 5.14.2/Src/qtbase/lib - but my app is linking with 5.14.2/gcc_64/lib. How do I “install” the rebuilt libraries into that directory? Is it ‘make install’? I tried “make install”, but it fails:

    % make install
     
    cd src/ && ( test -e Makefile || /home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/bin/qmake -o Makefile /home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/src/src.pro ) && make -f Makefile install
    make[1]: Entering directory '/home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/src'
    cd tools/bootstrap/ && ( test -e Makefile || /home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/bin/qmake -o Makefile /home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/src/tools/bootstrap/bootstrap.pro ) && make -f Makefile install
    make[2]: Entering directory '/home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/src/tools/bootstrap'
    /home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/bin/qmake -install qinstall ../../../lib/libQt5Bootstrap.a /usr/local/Qt-5.14.2/lib/libQt5Bootstrap.a
    Error copying ../../../lib/libQt5Bootstrap.a to /usr/local/Qt-5.14.2/lib/libQt5Bootstrap.a: Destination file exists
    Makefile:14154: recipe for target 'install_target' failed
    make[2]: *** [install_target] Error 3
    make[2]: Leaving directory '/home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/src/tools/bootstrap'
    Makefile:82: recipe for target 'sub-bootstrap-install_subtargets' failed
    make[1]: *** [sub-bootstrap-install_subtargets] Error 2
    make[1]: Leaving directory '/home/oreilly/Qt5.14.2/5.14.2/Src/qtbase/src'
    Makefile:62: recipe for target 'sub-src-install_subtargets' failed
    make: *** [sub-src-install_subtargets] Error 2
    

    If I just manually copy all libraries from 5.14.2/Src/qtbase/lib to 5.14.2/gcc_64/lib, then link my application with those, it gives this error:

    /home/oreilly/Qt5.14.2/5.14.2/gcc_64/lib/libQt5Qml.so: undefined reference to `operator delete[](void*, unsigned long)@Qt_5'
    /home/oreilly/Qt5.14.2/5.14.2/gcc_64/lib/libQt5Quick.so: undefined reference to `operator delete(void*, unsigned long)@Qt_5'
    collect2: error: ld returned 1 exit status
    Makefile:373: recipe for target 'mbgrdviz-2' failed
    

    So I am still missing something...

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #8

    @Tom-asso Since you're you're installing into /usr/local you should call make install with sudo.

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    Tom assoT 1 Reply Last reply
    2
    • jsulmJ jsulm

      @Tom-asso Since you're you're installing into /usr/local you should call make install with sudo.

      Tom assoT Offline
      Tom assoT Offline
      Tom asso
      wrote on last edited by
      #9

      @jsulm - ah, you are right of course!

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by SGaist
        #10

        Note that if you want to hack on Qt itself, you can use the developer-build and it will do an in place build. However it should not be used to build software releases as it toggles some flags for development.

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        Tom assoT 1 Reply Last reply
        1
        • SGaistS SGaist

          Note that if you want to hack on Qt itself, you can use the developer-build and it will do an in place build. However it should not be used to build software releases as it toggles some flags for development.

          Tom assoT Offline
          Tom assoT Offline
          Tom asso
          wrote on last edited by
          #11

          @SGaist - could you please explain? What is the "developer build", and what is the "development.3" flag?
          I would like to modify qtdatavisualization3d for my app, then freely distribute to users on a non-commercial basis - which source file should I be using in that case?
          Thanks!

          1 Reply Last reply
          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #12

            The 3 was a typo.
            As I wrote, it will trigger an in-place build, meaning that you won't have to call make install each time you want to test your modifications.

            In that case, you should only build that module rather than the whole of Qt.

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

            Tom assoT 1 Reply Last reply
            1
            • SGaistS SGaist

              The 3 was a typo.
              As I wrote, it will trigger an in-place build, meaning that you won't have to call make install each time you want to test your modifications.

              In that case, you should only build that module rather than the whole of Qt.

              Tom assoT Offline
              Tom assoT Offline
              Tom asso
              wrote on last edited by
              #13

              @SGaist - thanks. Earlier you mentioned a "Ce" option to specify a particular sub-folder to build. Can you please refer me to a page describing how to use that?
              Thanks!

              1 Reply Last reply
              0
              • Tom assoT Offline
                Tom assoT Offline
                Tom asso
                wrote on last edited by
                #14

                @SGaist - after building in-place with 'make', the libraries are scattered among many different subdirectories. What is the best way to link against those, when there are in so many different places?
                Thanks!

                1 Reply Last reply
                0
                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #15

                  Did you do a build from scratch after adding that option to your configure line ?

                  With a developer build you should have all binaries in qtbase/bin and the libraries in qtbase/lib.

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                  Tom assoT 1 Reply Last reply
                  1
                  • SGaistS SGaist

                    Did you do a build from scratch after adding that option to your configure line ?

                    With a developer build you should have all binaries in qtbase/bin and the libraries in qtbase/lib.

                    Tom assoT Offline
                    Tom assoT Offline
                    Tom asso
                    wrote on last edited by
                    #16

                    @SGaist - yes I see them there, thanks.
                    Earlier you mentioned a "Ce" option to specify a particular sub-folder to build. Can you please refer me to a page describing how to use that?
                    Thanks!

                    1 Reply Last reply
                    0
                    • Tom assoT Offline
                      Tom assoT Offline
                      Tom asso
                      wrote on last edited by
                      #17

                      I do not see a qtcreator executable after building qt-everywhere-src-5.14.2. Is that expected?
                      I built with these configure options: -qt-xcb -recheck-all -debug -developer-build

                      1 Reply Last reply
                      0
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #18

                        Yes it is to be expected, Qt Creator is a independent project.

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                        1 Reply Last reply
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