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Building Qt as static libraries and linking on RedHat 7.2

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  • Simon PlattenS Offline
    Simon PlattenS Offline
    Simon Platten
    wrote on last edited by
    #7

    No problem, what I would like is a packager that identifies what libraries are required, grabs them and packages then into an installer that we can use for installations and be assured that nothing is missing.

    Kind Regards,
    Simon Platten

    kshegunovK 1 Reply Last reply
    0
    • Simon PlattenS Simon Platten

      No problem, what I would like is a packager that identifies what libraries are required, grabs them and packages then into an installer that we can use for installations and be assured that nothing is missing.

      kshegunovK Offline
      kshegunovK Offline
      kshegunov
      Moderators
      wrote on last edited by
      #8

      @Simon-Platten said in Building Qt as static libraries and linking on RedHat 7.2:

      No problem, what I would like is a packager that identifies what libraries are required, grabs them and packages then into an installer that we can use for installations and be assured that nothing is missing.

      That's the thing, you shouldn't ... it's sounds counterintuitive I know, but Linux distros have their own repository and in that repository there's Qt, to which you should stick. Qt is binary compatible just for that reason, the API is allowed to (breakingly) change only between major versions, which means that things developed with Qt 5.0 should work out of the box if you just substitute the target of the libQt5Core.so symbolic link from libQt5Core.so.5.0.0 to libQt5Core.so.5.7.0. You can deploy Qt binaries as well, but it starts to get really painful if there's a change in one of the underlying libraries the Qt platform integration plugins depend on. Same problem with static builds, you can't build the kernel API statically, right, plus you get one big monster executable and you need to initialize the plugins Qt uses manually from code (which Qt does automagically when the loader loads the corresponding .so). Just my 2 cents.

      If you still decide to walk the "deploy Qt binaries" way then the Qt documentation provides a relatively comprehensive text, as you've already found out, on how to do it.

      Read and abide by the Qt Code of Conduct

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      0
      • Simon PlattenS Offline
        Simon PlattenS Offline
        Simon Platten
        wrote on last edited by Simon Platten
        #9

        Now I'm confused, what are you saying...I have built at least 4 RedHat 7.2 systems and none of these had the Qt shared object libraries after the install. This is why we are looking at static builds.

        I've just relinked our application with the static libraries and I get:

        This application failed to start because it could not find or load the Qt platform plugin "xcb"
        in "".

        Reinstalling the application may fix this problem.
        Aborted (core dumped)

        [Edit] I've run ldd on the application and noted the referneced libraries, I added all these to the project but it still comes up with the same error.

        Kind Regards,
        Simon Platten

        kshegunovK 1 Reply Last reply
        0
        • Simon PlattenS Simon Platten

          Now I'm confused, what are you saying...I have built at least 4 RedHat 7.2 systems and none of these had the Qt shared object libraries after the install. This is why we are looking at static builds.

          I've just relinked our application with the static libraries and I get:

          This application failed to start because it could not find or load the Qt platform plugin "xcb"
          in "".

          Reinstalling the application may fix this problem.
          Aborted (core dumped)

          [Edit] I've run ldd on the application and noted the referneced libraries, I added all these to the project but it still comes up with the same error.

          kshegunovK Offline
          kshegunovK Offline
          kshegunov
          Moderators
          wrote on last edited by
          #10

          @Simon-Platten said in Building Qt as static libraries and linking on RedHat 7.2:

          none of these had the Qt shared object libraries after the install.

          Have you installed Qt from the distribution's repository? I work on Debian (testing), here's what I have for Qt, all precompiled and ready to be installed.

          This application failed to start because it could not find or load the Qt platform plugin "xcb"
          in "".

          As I said, with static linkage the plugins must be loaded from code.

          Look here and here for more info. It should be enough to add:

          CONFIG += static
          

          for your application, so I'd start there.

          Kind regards.

          Read and abide by the Qt Code of Conduct

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          0
          • Simon PlattenS Offline
            Simon PlattenS Offline
            Simon Platten
            wrote on last edited by Simon Platten
            #11

            Thank you, will look into this....

            hmm...I found one post from last year:

            https://blog.qt.io/blog/2015/06/24/qt-is-coming-to-red-hat-enterprise-linux/

            However there isn't any recent activity on this and I'm not sure that Qt5.6 libraries are available from any repositories.

            Kind Regards,
            Simon Platten

            kshegunovK 1 Reply Last reply
            0
            • Simon PlattenS Simon Platten

              Thank you, will look into this....

              hmm...I found one post from last year:

              https://blog.qt.io/blog/2015/06/24/qt-is-coming-to-red-hat-enterprise-linux/

              However there isn't any recent activity on this and I'm not sure that Qt5.6 libraries are available from any repositories.

              kshegunovK Offline
              kshegunovK Offline
              kshegunov
              Moderators
              wrote on last edited by
              #12

              @Simon-Platten said in Building Qt as static libraries and linking on RedHat 7.2:

              However there isn't any recent activity on this and I'm not sure that Qt5.6 libraries are available from any repositories.

              I can't say, sorry. You may be right that there isn't a prebuilt binary, I never cared much for the RedHat family, so I'm not up to date.

              Read and abide by the Qt Code of Conduct

              1 Reply Last reply
              0
              • Simon PlattenS Offline
                Simon PlattenS Offline
                Simon Platten
                wrote on last edited by
                #13

                I have no choice the company I'm contracting to required a licensed version of Linux.

                Kind Regards,
                Simon Platten

                kshegunovK 1 Reply Last reply
                0
                • Simon PlattenS Simon Platten

                  I have no choice the company I'm contracting to required a licensed version of Linux.

                  kshegunovK Offline
                  kshegunovK Offline
                  kshegunov
                  Moderators
                  wrote on last edited by kshegunov
                  #14

                  @Simon-Platten said in Building Qt as static libraries and linking on RedHat 7.2:

                  I have no choice the company I'm contracting to required a licensed version of Linux.

                  I didn't mean to imply that you should switch, I only meant that I am not up to date with RedHat and what it provides.

                  Read and abide by the Qt Code of Conduct

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                  0
                  • Simon PlattenS Offline
                    Simon PlattenS Offline
                    Simon Platten
                    wrote on last edited by
                    #15

                    Thats ok, no offence taken :)

                    Kind Regards,
                    Simon Platten

                    1 Reply Last reply
                    0
                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #16

                      Hi,

                      Just in case, there's a WIP tool available here which goal is to be integrated in Qt in the long run.

                      Hope it helps

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

                      kshegunovK 1 Reply Last reply
                      0
                      • SGaistS SGaist

                        Hi,

                        Just in case, there's a WIP tool available here which goal is to be integrated in Qt in the long run.

                        Hope it helps

                        kshegunovK Offline
                        kshegunovK Offline
                        kshegunov
                        Moderators
                        wrote on last edited by
                        #17

                        @SGaist
                        This is so new and fresh, I love it. I'll consider making a few pull requests in the near future. :)

                        Read and abide by the Qt Code of Conduct

                        1 Reply Last reply
                        0

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