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  1. Qbs ("Cubes")
  2. QBS-1617

Linker error when compiling against Qt 6.0.0 Alpha/Beta (cannot find -l-pthread)

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    • Linux/X11

      There appears an -l-pthread entry on the linker command-line that is causing trouble:

      ERROR: /usr/lib/ccache/g++ -Wl,-soname=libtiledquick.so,--as-needed,-m,elf_x86_64,-rpath,/home/bjorn/Qt/6.0.0/gcc_64/lib -shared -L/home/bjorn/Qt/6.0.0/gcc_64/lib -m64 -o /home/bjorn/projects/tiled/default/libtiledquick.11f78142/libtiledquick.so /home/bjorn/projects/tiled/default/libtiledquick.11f78142/3a52ce780950d4d9/mapitem.cpp.o /home/bjorn/projects/tiled/default/libtiledquick.11f78142/3a52ce780950d4d9/maploader.cpp.o /home/bjorn/projects/tiled/default/libtiledquick.11f78142/3a52ce780950d4d9/tilelayeritem.cpp.o /home/bjorn/projects/tiled/default/libtiledquick.11f78142/3a52ce780950d4d9/tilesnode.cpp.o /home/bjorn/projects/tiled/default/libtiledquick.11f78142/73489b871e127538/moc_mapitem.cpp.o /home/bjorn/projects/tiled/default/libtiledquick.11f78142/73489b871e127538/moc_maploader.cpp.o /home/bjorn/projects/tiled/default/libtiledquick.11f78142/73489b871e127538/moc_mapref.cpp.o /home/bjorn/projects/tiled/default/libtiledquick.11f78142/73489b871e127538/moc_tilelayeritem.cpp.o /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6Quick.so.6.0.0 /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6QmlModels.so.6.0.0 /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6Qml.so.6.0.0 /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6OpenGL.so.6.0.0 /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6Network.so.6.0.0 /home/bjorn/projects/tiled/default/libtiled.080f31f8/libtiled.so /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6Gui.so.6.0.0 /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6Core.so.6.0.0 /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6QmlModels.so /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6Qml.so -l-pthread /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6Gui.so /home/bjorn/Qt/6.0.0/gcc_64/lib/libQt6Core.so -lGLX -lOpenGL -lpthread

ERROR: /usr/bin/ld: cannot find -l-pthread
collect2: error: ld returned 1 exit status
ERROR: Process failed with exit code 1.

      This problem does not happen with the same Qbs version but compiling against Qt 5.15.1.

      Searching through the auto-generated Qt modules, I find several "-pthread" entries in dynamicLibsRelease properties that should probably be "pthread" entries:

      bjorn@thor:~/projects/tiled/default/genmodules/Qt/d5d4cd07616a5428$ grep -Irn pthread 
d46821bae07cf44b/modules/Qt/core/core.qbs:70:    property stringList dynamicLibsRelease: ["pthread"]
d46821bae07cf44b/modules/Qt/bootstrap-private/module.qbs:11:    staticLibsRelease: ["pthread","z"]
84267398099612f5/modules/Qt/quicktest/module.qbs:13:    dynamicLibsRelease: ["-pthread"]
84267398099612f5/modules/Qt/waylandclient/module.qbs:13:    dynamicLibsRelease: ["-pthread","wayland-client","wayland-cursor"]
84267398099612f5/modules/Qt/help/module.qbs:13:    dynamicLibsRelease: ["-pthread"]
84267398099612f5/modules/Qt/qml/qml.qbs:35:    dynamicLibsRelease: ["-pthread"]
84267398099612f5/modules/Qt/uitools/module.qbs:13:    dynamicLibsRelease: ["-pthread"]
84267398099612f5/modules/Qt/core/core.qbs:70:    property stringList dynamicLibsRelease: ["pthread"]
84267398099612f5/modules/Qt/designer/module.qbs:13:    dynamicLibsRelease: ["-pthread"]
84267398099612f5/modules/Qt/svg/module.qbs:13:    dynamicLibsRelease: ["-pthread"]

      Some further analysis based on discussion on Discord showed that these values are taken from Qt's .prl files (most files left out for brevity, but about 22 files in total are affected, with 20 other files using -lpthread instead):

      bjorn@thor:~/Qt/6.0.0/gcc_64/lib$ grep -Irn "LIBS =.*\-l\-pthread" *.prl
...
libQt6Qml.prl:5:QMAKE_PRL_LIBS = -lQt6Network -lQt6Core -l-pthread
libQt6QmlWorkerScript.prl:5:QMAKE_PRL_LIBS = $$[QT_INSTALL_LIBS]/libQt6Qml.so -lQt6Network -lQt6Core -l-pthread
libQt6QuickControls2Impl.prl:5:QMAKE_PRL_LIBS = -lQt6Quick -lQt6QmlModels -lQt6OpenGL -lQt6Gui -lGLX -lOpenGL -lQt6Qml -lQt6Network -lQt6Core -l-pthread
libQt6QuickControls2.prl:5:QMAKE_PRL_LIBS = -lQt6Quick -lQt6QmlModels -lQt6OpenGL -lQt6Gui -lGLX -lOpenGL -lQt6Qml -lQt6Network -lQt6Core -l-pthread
...

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            kandeler Christian Kandeler
            bjorn Thorbjørn Lindeijer
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              Created:
              Updated:
              Resolved:

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