Ation Ation - 4 months ago 21
Linux Question

Getting load library or linking error for XCB plugin of statically linked Qt5

Trying to create C++ Qt5.6.1 application and start it on Debian.
Getting either link error or load library error.

Qt build to a static libs, used configuration

configure -release -confirm-license -opensource -static -no-dbus -no-openssl -no-qml-debug -no-opengl -qt-freetype -qt-xcb -nomake tools -nomake tests -nomake examples -no-sql-db2 -no-sql-oci -no-sql-tds -no-sql-sqlite2 -no-sql-odbc -no-sql-ibase -no-sql-psql -skip doc -skip imageformats -skip webchannel -skip webengine -skip webview -skip sensors -skip serialport -skip script -skip multimedia


Project created with Cmake, libs are specified in this way:

SET(CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH} "${QT5_LIB_ROOT}/cmake")

FIND_PACKAGE(Qt5Core REQUIRED)
FIND_PACKAGE(Qt5Gui REQUIRED)
FIND_PACKAGE(Qt5Widgets REQUIRED)
FIND_PACKAGE(Qt5Network REQUIRED)

FIND_PACKAGE( PNG REQUIRED )
FIND_PACKAGE( ZLIB REQUIRED)
FIND_PACKAGE( Threads REQUIRED )

IF(CMAKE_BUILD_TYPE STREQUAL "Debug")
SET(QT_LIBS
libqtharfbuzzng_debug.a
libqtpcre_debug.a
libQt5PlatformSupport_debug.a
libxcb-static_debug.a
)
ELSE()
SET(QT_LIBS
libqtharfbuzzng.a
libqtpcre.a
libQt5PlatformSupport.a
libxcb-static.a
)
ENDIF(CMAKE_BUILD_TYPE STREQUAL "Debug")

SET(OS_SPECIFIC_LIBS
dl
Qt5::QXcbIntegrationPlugin
${CMAKE_THREAD_LIBS_INIT}
${ZLIB_LIBRARIES}
${PNG_LIBRARY} )

FOREACH(lib_name ${QT_LIBS})
IF(NOT EXISTS ${QT5_LIB_ROOT}/${lib_name})
MESSAGE(FATAL_ERROR "Could not locate required Qt lib ${QT5_LIB_ROOT}/${lib_name}")
ENDIF()

LIST(APPEND OS_SPECIFIC_LIBS ${QT5_LIB_ROOT}/${lib_name})
ENDFOREACH(lib_name)


And if I'm importing XCB plugin in the code ( Q_IMPORT_PLUGIN(QXcbIntegrationPlugin) it gives me link error:

/Qt5/plugins/platforms/libqxcb.a(qxcbmain.o): In function `QXcbIntegrationPlugin::create(QString const&, QStringList const&, int&, char**)':
qxcbmain.cpp:(.text+0x67): undefined reference to `QXcbIntegration::QXcbIntegration(QStringList const&, int&, char**)'


Anf if I don't import plugin - it just not start with error:

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


Any help? advice?

Thanks.

Answer

Solution was simple - just link with proper system libs: fixed with adding

FIND_PACKAGE( X11 REQUIRED )

SET(OS_SPECIFIC_LIBS
   ...
   xcb
   X11-xcb
   ${X11_LIBRARIES}
)