Hi, I'm porting my application from qt4 to qt5. I filled my CMakeLists.txt of if/else conditions to handle qt5 (default) and qt4 (minimum) requirements. During compilation I fixed all error messages and seems all ok. But when I try to launch it, seg-fault occurs and the debugger opens disassembler on a line of /usr/lib/libQtGui.so.4, and this is strange since the application should build against qt5. I used ldd on the executable and I found a mixture of qt4/qt5 libraries:

$ ldd ./myapp
linux-vdso.so.1 (0x00007f21147ae000)
libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007f2113f2c000)
libQt5Widgets.so.5 => /usr/lib/libQt5Widgets.so.5 (0x00007f2113749000)
libQt5Network.so.5 => /usr/lib/libQt5Network.so.5 (0x00007f2113411000)
libQt5Xml.so.5 => /usr/lib/libQt5Xml.so.5 (0x00007f21131d7000)
libQt5Svg.so.5 => /usr/lib/libQt5Svg.so.5 (0x00007f2112f8b000)
libphonon.so.4 => /usr/lib/libphonon.so.4 (0x00007f2112d1b000)
libQtSvg.so.4 => /usr/lib/libQtSvg.so.4 (0x00007f2112ac5000)
libqjson.so.0 => /usr/lib/libqjson.so.0 (0x00007f211289e000)
libQtXml.so.4 => /usr/lib/libQtXml.so.4 (0x00007f211265c000)
libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007f211203d000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f2111d39000)
libm.so.6 => /lib/libm.so.6 (0x00007f2111a36000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f2111820000)
libc.so.6 => /lib/libc.so.6 (0x00007f2111475000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00007f2111257000)
libz.so.1 => /usr/lib/libz.so.1 (0x00007f2111042000)
libicui18n.so.51 => /usr/lib/libicui18n.so.51 (0x00007f2110c3f000)
libicuuc.so.51 => /usr/lib/libicuuc.so.51 (0x00007f21108c8000)
libdl.so.2 => /lib/libdl.so.2 (0x00007f21106c4000)
librt.so.1 => /lib/librt.so.1 (0x00007f21104bc000)
libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x00007f21101c7000)
/lib64/ld-linux-x86-64.so.2 (0x00007f2114591000)
libX11.so.6 => /usr/lib/libX11.so.6 (0x00007f210fe90000)
libssl.so.1.0.0 => /usr/lib/libssl.so.1.0.0 (0x00007f210fc26000)
libcrypto.so.1.0.0 => /usr/lib/libcrypto.so.1.0.0 (0x00007f210f81e000)
libQtCore.so.4 => /usr/lib/libQtCore.so.4 (0x00007f210f33e000)
libQtGui.so.4 => /usr/lib/libQtGui.so.4 (0x00007f210e6bd000)
libQtDBus.so.4 => /usr/lib/libQtDBus.so.4 (0x00007f210e442000)
libpulse.so.0 => /usr/lib/libpulse.so.0 (0x00007f210e1f8000)
libpulse-mainloop-glib.so.0 => /usr/lib/libpulse-mainloop-glib.so.0 (0x00007f210dff4000)
libqzeitgeist.so.1 => /usr/lib/libqzeitgeist.so.1 (0x00007f210ddd0000)
libpng16.so.16 => /usr/lib/libpng16.so.16 (0x00007f210db9c000)
libGL.so.1 => /usr/lib/libGL.so.1 (0x00007f210d86e000)
libicudata.so.51 => /usr/lib/libicudata.so.51 (0x00007f210c124000)
libpcre.so.0 => /usr/lib/libpcre.so.0 (0x00007f210becb000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0x00007f210bcae000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00007f210ba0f000)
libSM.so.6 => /usr/lib/libSM.so.6 (0x00007f210b808000)
libICE.so.6 => /usr/lib/libICE.so.6 (0x00007f210b5ed000)
libXrender.so.1 => /usr/lib/libXrender.so.1 (0x00007f210b3e3000)
libXcursor.so.1 => /usr/lib/libXcursor.so.1 (0x00007f210b1d9000)
libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00007f210af9f000)
libXext.so.6 => /usr/lib/libXext.so.6 (0x00007f210ad8e000)
libdbus-1.so.3 => /usr/lib/libdbus-1.so.3 (0x00007f210ab48000)
libjson-c.so.2 => /usr/lib/libjson-c.so.2 (0x00007f210a93e000)
libpulsecommon-4.0.so => /usr/lib/pulseaudio/libpulsecommon-4.0.so (0x00007f210a6d2000)
libnvidia-tls.so.319.49 => /usr/lib/libnvidia-tls.so.319.49 (0x00007f210a4cf000)
libnvidia-glcore.so.319.49 => /usr/lib/libnvidia-glcore.so.319.49 (0x00007f2107f77000)
libXau.so.6 => /usr/lib/libXau.so.6 (0x00007f2107d74000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0x00007f2107b6f000)
libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0x00007f210795f000)
libuuid.so.1 => /usr/lib/libuuid.so.1 (0x00007f210775b000)
libXfixes.so.3 => /usr/lib/libXfixes.so.3 (0x00007f2107555000)
libexpat.so.1 => /usr/lib/libexpat.so.1 (0x00007f210732d000)
libsndfile.so.1 => /usr/lib/libsndfile.so.1 (0x00007f21070c6000)
libasyncns.so.0 => /usr/lib/libasyncns.so.0 (0x00007f2106ec1000)
libFLAC.so.8 => /usr/lib/libFLAC.so.8 (0x00007f2106c90000)
libvorbisenc.so.2 => /usr/lib/libvorbisenc.so.2 (0x00007f21067c2000)
libvorbis.so.0 => /usr/lib/libvorbis.so.0 (0x00007f2106596000)
libogg.so.0 => /usr/lib/libogg.so.0 (0x00007f2106390000)
libnsl.so.1 => /lib/libnsl.so.1 (0x00007f2106178000)
libresolv.so.2 => /lib/libresolv.so.2 (0x00007f2105f61000)
Unfortunately I can't remove qt4 since required by KDE. This is an excerpt of CMakeLists.txt I'm using:

Qt Code: 
  1. ...
  2. cmake_minimum_required(VERSION 2.6)
  3.  
  4. set( CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/modules )
  5.  
  6. find_package(Qt5Core)
  7. if( Qt5Core_DIR )
  8.     message(STATUS "Found Qt5! Be aware that Qt5-support is still experimental and not officially supported!")
  9.     ADD_DEFINITIONS(-fPIC)
  10.     find_package(Qt5Widgets REQUIRED)
  11.     find_package(Qt5Gui REQUIRED)
  12.     find_package(Qt5Network REQUIRED)
  13.     find_package(Qt5Xml REQUIRED)
  14.     find_package(Qt5Svg REQUIRED)
  15.     find_package(Qt5LinguistTools REQUIRED)
  16.     set(CMAKE_AUTOMOC ON)
  17. endif()
  18. if( NOT Qt5Core_DIR )
  19.     find_package(Qt4 COMPONENTS QTCORE QTGUI QTNETWORK QTSVG QTXML)
  20. endif()
  21. find_package(Phonon REQUIRED)
  22. find_package(QJson REQUIRED)
  23.  
  24. # Handle Translations
  25. file( GLOB TRANS_FILES ${CMAKE_SOURCE_DIR}/translations/myapp_*.ts)
  26. set(TRANSLATIONS ${TRANS_FILES})
  27.  
  28. ...
  29.  
  30. if( Qt5Core_DIR )
  31.     include_directories(${Qt5Core_INCLUDE_DIRS}
  32.                     ${Qt5Widgets_INCLUDE_DIRS}
  33.                     ${Qt5Network_INCLUDE_DIRS}
  34.                     ${Qt5Xml_INCLUDE_DIRS}
  35.                     ${Qt5Svg_INCLUDE_DIRS}
  36.                     ${PHONON_INCLUDES}
  37.                     ${QJSON_INCLUDE_DIR}
  38.                     ${CMAKE_CURRENT_BINARY_DIR}
  39.                     ${CMAKE_CURRENT_SOURCE_DIR})
  40.  
  41.     qt5_add_resources(myapp_RC_SRCS ${myapp_RCS} )
  42.     qt5_wrap_ui(myapp_UI_HEADERS ${myapp_UI})
  43.     qt5_add_translation(myapp_I18N ${TRANSLATIONS})
  44. endif()
  45. if( NOT Qt5Core_DIR )
  46.     include_directories(${QT_INCLUDES}
  47.                     ${PHONON_INCLUDES}
  48.                     ${QJSON_INCLUDE_DIR}
  49.                     ${CMAKE_CURRENT_BINARY_DIR}
  50.                     ${CMAKE_CURRENT_SOURCE_DIR})
  51.     qt4_add_resources(myapp_RC_SRCS ${myapp_RCS} )
  52.     qt4_wrap_ui(myapp_UI_HEADERS ${myapp_UI})
  53.     qt4_automoc(${myapp_SRCS})
  54.     qt4_add_translation(myapp_I18N ${TRANSLATIONS})
  55. endif()
  56.  
  57. add_executable(myapp main.cpp ${myapp_SRCS} ${myapp_RC_SRCS} ${myapp_UI_HEADERS} ${myapp_I18N})
  58.  
  59. if( Qt5Core_DIR )
  60. target_link_libraries(myapp
  61.                       ${Qt5Core_LIBRARIES}
  62.                       ${Qt5Widgets_LIBRARIES}
  63.                       ${Qt5Network_LIBRARIES}
  64.                       ${Qt5Xml_LIBRARIES}
  65.                       ${Qt5Svg_LIBRARIES}
  66.                       ${PHONON_LIBRARY}
  67.                       ${QT_QTSVG_LIBRARY}
  68.                       ${QJSON_LIBRARY}
  69.                       ${QT_QTXML_LIBRARY})
  70. endif()
  71. if( NOT Qt5Core_DIR )
  72. target_link_libraries(myapp
  73.                       ${QT_QTCORE_LIBRARY}
  74.                       ${QT_QTGUI_LIBRARY}
  75.                       ${QT_QTNETWORK_LIBRARY}
  76.                       ${PHONON_LIBRARY}
  77.                       ${QT_QTSVG_LIBRARY}
  78.                       ${QJSON_LIBRARY}
  79.                       ${QT_QTXML_LIBRARY})
  80. endif()
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Any idea about the problem?

Very thanks.