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  1. Qt
  2. QTBUG-108783

own build DBus lib is not recognised using PKG_CONFIG_PATH

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Details

    • Bug
    • Resolution: Unresolved
    • P3: Somewhat important
    • None
    • 6.4.1
    • Build System: CMake
    • None
    • fresh & up to date Ubuntu 22.04
    • Linux/Wayland

    Description

      I'm building DBus lib from source with Thread-Sanitizer (TSAN) support to reduce the possibility for false-positives.

      I'm using the PKG_CONFIG_PATH environment var to let cmake know what dbus library to select but that does not work – cmake always selects the systems dbus library.

      Currently I'm forcing my example code to use my dbus build using LD_LIBRARY_PATH on start.
      Using PKG_CONFIG_PATH path for a self-built Glib does work out of the box and Qt builds with a dependency to my Glib build, also my example is using my glib without any LD_LIBRARY_PATH magic.

       

      im building DBus with these steps

      cd ~/qt6_dev
git clone https://github.com/freedesktop/dbus.gitcd dbus
 git checkout dbus-1.12.20
 cd ..
 mkdir dbus-build
 cd dbus-build
 PKG_CONFIG_PATH=~/qt6_dev/glib-install/lib/x86_64-linux-gnu/pkgconfig
 cmake ../dbus/cmake -DCMAKE_INSTALL_PREFIX=~/qt6_dev/dbus-install
 -DCMAKE_CXX_FLAGS="-g -fno-omit-frame-pointer -fsanitize=thread"-DCMAKE_C_FLAGS="-g -fno-omit-frame-pointer -fsanitize=thread"-DCMAKE_EXE_LINKER_FLAGS="-fno-omit-frame-pointer -fsanitize=thread"-DCMAKE_MODULE_LINKER_FLAGS="-fno-omit-frame-pointer -fsanitize=thread"cmake --build . --parallel 6
 cmake --install .

      and the used Glib with these steps

      cd ~/qt6_dev
 git clone https://gitlab.gnome.org/GNOME/glib.gitcd glib
 git checkout 2.72.1
 cd ..
 mkdir glib-build
 cd glib-build
 meson setup ../glib -Dbuildtype=debug -Db_sanitize=thread --prefix
 ~/qt6_dev/glib-install
 meson compile
 meson install

       

      This also happens with Qt dev branch.
      I think it could be related to QTBUG-86283.

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        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-108784 TSAN build of GLib+DBus+Qt 6.4 shows TSAN warnings with a tiny QApplication example

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Suggestion - Public suggestions QTBUG-86283 CMake Build: Do not rely on only pkg-config for FindXYZ CMake modules

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Open
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              qtbuildsystem Qt Build System Team
              llm Dennis Lühring
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              Dates

                Created:
                Updated:

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