qt5.4.1->qt5.5.1 [5.9.6; 5.10.1] - OpenGL builds OK but apps don't see it



  • Hi,
    I'm fighting with this issue since week...
    I'm trying to upgrade qt from working 5.4.1 to newer version (5.5.1, 5.9.6 and 5.10.1) tested.
    My app (mythtv) can't see OpenGL for any qt version newer than 5.4.1.

    Short summary:

    • I have fully working qt5.4.1 in cross-compiled environment (minimyth2)

    • My qt upgrade to 5.5.1/5.9.6/5.10.1 is in exactly the same environment (recompile with new qt sources only)

    • Qt 5.5.1/5.9.6/5.10.1 configure reports "OpenGL desktop: yes"

    • Qt build reports NO ANY errors nor even warnings regarding OpenGL code

    • My app (mythtv) compiles also no any errors nor even warnings regarding OpenGL code

    • Any new version of qt (5.5.1/5.9.6/5.10.1) gives in my app "OpenGL not available"

    • App (mythtv) for sure works OK with qt5.5/5.9/5.10 (many users are using it with those Qt versions no problem)

    • My environment is: gcc7.3.0; glibc2.27; xorg1.19; mesa18.1.3.

    As qt and mythtv build reports no single error nor warning related to OpenGL code - I simply don't have idea where to start...

    Can somebody hint me how to move forward with this?

    i.e. is there any possibility to enable extended checks during qt building to see where is my environment incompatibility causing qt to fail in providing OpenGL to app?

    thx in advance!

    ps: here is 5.9.5 my configure summary:

    cat config.summary

    
    Configuration: cross_compile sse2 sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl enable_new_dtags f16c largefile shared release c++11 concurrent dbus no-qml-debug reduce_exports reduce_relocations stl
    Build options:
      Mode ................................... release
      Optimize release build for size ........ no
      Building shared libraries .............. yes
      Using C++ standard ..................... C++11
      Using ccache ........................... no
      Using gold linker ...................... no
      Using new DTAGS ........................ yes
      Using precompiled headers .............. no
      Using LTCG ............................. no
      Target compiler supports:
        SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
        AVX .................................. AVX AVX2 F16C
        AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI
      Build parts ............................ libs
    Qt modules and options:
      Qt Concurrent .......................... yes
      Qt D-Bus ............................... yes
      Qt D-Bus directly linked to libdbus .... yes
      Qt Gui ................................. yes
      Qt Network ............................. yes
      Qt Sql ................................. yes
      Qt Testlib ............................. yes
      Qt Widgets ............................. yes
      Qt Xml ................................. yes
    Support enabled for:
      Using pkg-config ....................... yes
      QML debugging .......................... no
      udev ................................... yes
      Using system zlib ...................... yes
    Qt Core:
      DoubleConversion ....................... yes
        Using system DoubleConversion ........ no
      GLib ................................... yes
      iconv .................................. no
      ICU .................................... yes
      Logging backends:
        journald ............................. no
        syslog ............................... no
        slog2 ................................ no
      Using system PCRE2 ..................... no
    Qt Network:
      getaddrinfo() .......................... yes
      getifaddrs() ........................... yes
      IPv6 ifname ............................ yes
      libproxy ............................... no
      OpenSSL ................................ yes
        Qt directly linked to OpenSSL ........ yes
      SCTP ................................... no
      Use system proxies ..................... yes
    Qt Gui:
      Accessibility .......................... yes
      FreeType ............................... yes
        Using system FreeType ................ yes
      HarfBuzz ............................... yes
        Using system HarfBuzz ................ yes
      Fontconfig ............................. yes
      Image formats:
        GIF .................................. yes
        ICO .................................. yes
        JPEG ................................. yes
          Using system libjpeg ............... yes
        PNG .................................. yes
          Using system libpng ................ yes
      EGL .................................... no
      OpenVG ................................. no
      OpenGL:
        Desktop OpenGL ....................... yes
        OpenGL ES 2.0 ........................ no
        OpenGL ES 3.0 ........................ no
        OpenGL ES 3.1 ........................ no
      Session Management ..................... no
    Features used by QPA backends:
      evdev .................................. yes
      libinput ............................... no
      INTEGRITY HID .......................... no
      mtdev .................................. no
      tslib .................................. no
      xkbcommon-evdev ........................ yes
    QPA backends:
      DirectFB ............................... no
      EGLFS .................................. no
      LinuxFB ................................ yes
      VNC .................................... yes
      Mir client ............................. no
      X11:
        Using system-provided XCB libraries .. yes
        EGL on X11 ........................... no
        Xinput2 .............................. yes
        XCB XKB .............................. yes
        XLib ................................. yes
        XCB render ........................... yes
        XCB GLX .............................. yes
        XCB Xlib ............................. yes
        Using system-provided xkbcommon ...... yes
    Qt Widgets:
      GTK+ ................................... no
      Styles ................................. Fusion Windows
    Qt PrintSupport:
      CUPS ................................... no
    Qt Sql:
      DB2 (IBM) .............................. no
      InterBase .............................. no
      MySql .................................. yes
      OCI (Oracle) ........................... no
      ODBC ................................... no
      PostgreSQL ............................. no
      SQLite2 ................................ no
      SQLite ................................. no
        Using system provided SQLite ......... no
      TDS (Sybase) ........................... no
    QtXmlPatterns:
      XML schema support ..................... yes
    Qt QML:
      QML interpreter ........................ yes
      QML network support .................... yes
    Qt Quick:
      Direct3D 12 ............................ no
      AnimatedImage item ..................... yes
      Canvas item ............................ yes
      Support for Qt Quick Designer .......... yes
      Flipable item .......................... yes
      GridView item .......................... yes
      ListView item .......................... yes
      Path support ........................... yes
      PathView item .......................... yes
      Positioner items ....................... yes
      ShaderEffect item ...................... yes
      Sprite item ............................ yes
    Qt Gamepad:
      SDL2 ................................... yes
    Qt Wayland Client ........................ no
    Qt Wayland Compositor .................... no
    Qt Bluetooth:
      BlueZ .................................. no
      BlueZ Low Energy ....................... no
      Linux Crypto API ....................... no
    Qt Sensors:
      sensorfw ............................... no
    Qt Quick Controls 2:
      Styles ................................. Default Material Universal
    Qt Quick Templates 2:
      Hover support .......................... yes
      Multi-touch support .................... yes
    Qt Positioning:
      Gypsy GPS Daemon ....................... no
      WinRT Geolocation API .................. no
    Qt Location:
      Geoservice plugins:
        OpenStreetMap ........................ yes
        HERE ................................. yes
        Esri ................................. yes
        Mapbox ............................... yes
        MapboxGL ............................. no
        Itemsoverlay ......................... yes
    Qt Multimedia:
      ALSA ................................... yes
      GStreamer 1.0 .......................... yes
      GStreamer 0.10 ......................... no
      Video for Linux ........................ yes
      OpenAL ................................. no
      PulseAudio ............................. no
      Resource Policy (libresourceqt5) ....... no
      Windows Audio Services ................. no
      DirectShow ............................. no
      Windows Media Foundation ............... no
    
    Note: Dropped compiler flags '-pthread' when detecting library 'glib'.
    
    Note: When linking against OpenSSL, you can override the default
    library names through OPENSSL_LIBS.
    For example:
        OPENSSL_LIBS='-L/opt/ssl/lib -lssl -lcrypto' ./configure -openssl-linked
    
    Note: Disabling X11 Accessibility Bridge: D-Bus or AT-SPI is missing.
    
    Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.
    
    Note: Dropped compiler flags '-pthread' when detecting library 'gstreamer'.
    
    Note: Dropped compiler flags '-pthread' when detecting library 'gstreamer_app'.
    

  • Lifetime Qt Champion

    Hi,

    Since it seems to be MythTV specifically, you should consider contacting them for pointers on where to start debugging.



  • Unfortunately mythtv OpenGL works ok with on prebuild qt i.e. 5.5.1.
    I tested it on my test archlinux setup with prebuild qt - to verify that issue isn't in mythtv...
    Difference between test-bed (prebuild 5.5.1 qt on archlinux; works OK) and my project (minimyth2; working 5.4.1 updated to 5.5.1 not works) is:

    • in minimyth2 i'm cross compiling
    • minimyth2 has mesa18.1.3 (latest) while archlinux testbed has 11.1.2 mesa (archlinux has also other packages which are older - i.e. gcc or glibc - but I don't believe they are issue...)

    So issue is in my build of qt - not in mythtv nor qt itself I think.
    But I don't have idea how to move forward...

    EDIT: I just downgrade mesa to 11.1.2 (this version with prebuild qt5.5.1 works OK on my reference archlinux.) and rebuild qt5.5.1 on minimyth2.
    Unfortunately qt5.5.1 build from sources on minimyth2 still has broken OpenGL...

    What next is worth to downgrade?
    xcb?


  • Lifetime Qt Champion

    Let's sum up the situation:

    • What exact version of MythTV and Qt is working on what device ?
    • What is the target you are cross-compiling for ?
    • What does this device run as Linux distribution ?


  • What exact version of MythTV and Qt is working on what device ?
    
    • works:
      mythtv: current mythtv-master; last working qt is 5.4.2
      device: I'm not using -device declarations at configure stage. Instead I'm creating custom platform with toolchain information
    • not works:
      mythtv: current mythtv-master; qt 5.5.0 or newer
      device: see above
    What is the target you are cross-compiling for ?
    
    • currently x86_64 (future: i386; armv7; aarch64)
    What does this device run as Linux distribution ?
    
    • if got question correctly: minimyth2

    Below is a bit more details how I'm building qt:

    I'm cross-compiling Qt by creating dedicated platform with created custom qmake.
    My custom qmake is based on qmake from "linux-g++-64".
    Basically I do following:

    1.create mkspec/linux-g++-64-garhost/qmake.conf by

    cat linux-g++-64/qmake.conf >> qmake.conf
    cat linux-g++-64/../common/linux.conf >> qmake.conf
    cat linux-g++-64/../common/unix.conf >> qmake.conf
    cat linux-g++-64/../common/gcc-base-unix.conf >> qmake.conf
    cat linux-g++-64/../common/gcc-base.conf >> qmake.conf
    cat linux-g++-64/../common/g++-unix.conf >> qmake.conf
    cat linux-g++-64/../common/g++-base.conf >> qmake.conf
    cat linux-g++-64/../common/shell-unix.conf >> qmake.conf
    
    1. Updating variables in created qmake. Following variables are updated to cross-compile toolchain:
    QMAKE_COPY
    QMAKE_YACC
    QMAKE_CC
    QMAKE_CXX
    QMAKE_LINK
    QMAKE_LINK_SHLIB
    QMAKE_AR
    QMAKE_RANLIB
    QMAKE_STRIP
    QMAKE_CFLAGS
    QMAKE_CFLAGS_RELEASE
    QMAKE_LFLAGS
    QMAKE_INCDIR
    QMAKE_LIBDIR
    QMAKE_INCDIR_X11
    QMAKE_LIBDIR_X11
    QMAKE_INCDIR_OPENGL
    QMAKE_LIBDIR_OPENGL
    QMAKE_INCDIR_EGL
    QMAKE_LIBDIR_EGL
    

    This process gives me custom qmake.conf. Here is file I'm using to build working 5.4.2 (and unfortunatelly no OpenGL 5.5.1):

    [piotro@minimyth-dev linux-g++-64-garhost]$ cat qmake.conf
    QMAKE_CFLAGS_RELEASE = -pipe -pipe -march=x86-64 -mtune=generic -O3 -mfpmath=sse -m64
    #
    # qmake configuration for linux-g++
    #
    # Written for GNU/Linux platforms that have both lib and lib64 directories,
    # like the AMD Opteron.
    #
    
    MAKEFILE_GENERATOR      = UNIX
    CONFIG                 += incremental
    QMAKE_INCREMENTAL_STYLE = sublib
    
    QMAKE_CFLAGS            = -m64
    QMAKE_LFLAGS            = -Wl,--as-needed -pipe -pipe -march=x86-64 -mtune=generic -O3 -mfpmath=sse -m64 -m64
    
    
    
    QMAKE_LIBDIR_X11        = /home/piotro/minimyth-dev/images/main/usr/lib
    QMAKE_LIBDIR_OPENGL     = /home/piotro/minimyth-dev/images/main/usr/lib
    
    #
    # qmake configuration for common linux
    #
    
    QMAKE_PLATFORM         += linux
    
    QMAKE_CFLAGS_THREAD    += -D_REENTRANT
    QMAKE_CXXFLAGS_THREAD  += $$QMAKE_CFLAGS_THREAD
    QMAKE_LFLAGS_GCSECTIONS = -Wl,--gc-sections
    
    QMAKE_INCDIR            =/home/piotro/minimyth-dev/images/main/usr/include
    QMAKE_LIBDIR            =/home/piotro/minimyth-dev/images/main/usr/lib
    QMAKE_INCDIR_X11        =/home/piotro/minimyth-dev/images/main/usr/include
    QMAKE_LIBDIR_X11        =/home/piotro/minimyth-dev/images/main/usr/lib
    QMAKE_INCDIR_OPENGL     =/home/piotro/minimyth-dev/images/main/usr/include
    QMAKE_LIBDIR_OPENGL     =/home/piotro/minimyth-dev/images/main/usr/lib
    QMAKE_INCDIR_OPENGL_ES2 = $$QMAKE_INCDIR_OPENGL
    QMAKE_LIBDIR_OPENGL_ES2 = $$QMAKE_LIBDIR_OPENGL
    QMAKE_INCDIR_EGL        =/home/piotro/minimyth-dev/images/main/usr/include
    QMAKE_LIBDIR_EGL        =/home/piotro/minimyth-dev/images/main/usr/lib
    QMAKE_INCDIR_OPENVG     =
    QMAKE_LIBDIR_OPENVG     =
    
    QMAKE_LIBS              =
    QMAKE_LIBS_DYNLOAD      = -ldl
    QMAKE_LIBS_X11          = -lXext -lX11 -lm
    QMAKE_LIBS_NIS          = -lnsl
    QMAKE_LIBS_EGL          = -lEGL
    QMAKE_LIBS_OPENGL       = -lGL
    QMAKE_LIBS_OPENGL_ES2   = -lGLESv2
    QMAKE_LIBS_OPENVG       = -lOpenVG
    QMAKE_LIBS_THREAD       = -lpthread
    QMAKE_LIBS_LIBUDEV      = -ludev
    
    QMAKE_CFLAGS_WAYLAND    =
    QMAKE_INCDIR_WAYLAND    =
    QMAKE_LIBS_WAYLAND_CLIENT = -lwayland-client
    QMAKE_LIBS_WAYLAND_SERVER = -lwayland-server
    QMAKE_LIBDIR_WAYLAND    =
    QMAKE_DEFINES_WAYLAND   =
    QMAKE_WAYLAND_SCANNER   = wayland-scanner
    
    QMAKE_CFLAGS_XCB        =
    QMAKE_LIBS_XCB          =
    QMAKE_DEFINES_XCB       =
    
    QMAKE_AR                = x86_64-minimyth-linux-gnu-ar cqs
    QMAKE_OBJCOPY           = objcopy
    QMAKE_NM                = nm -P
    QMAKE_RANLIB            =x86_64-minimyth-linux-gnu-ranlib
    
    QMAKE_STRIP             = x86_64-minimyth-linux-gnu-strip
    QMAKE_STRIPFLAGS_LIB   += --strip-unneeded
    
    #
    # qmake configuration for common unix
    #
    
    QMAKE_PLATFORM         += unix posix
    
    QMAKE_LEX               = flex
    QMAKE_LEXFLAGS         +=
    QMAKE_YACC              = bison -y
    QMAKE_YACCFLAGS        += -d
    QMAKE_YACCFLAGS_MANGLE += -p $base -b $base
    QMAKE_YACC_HEADER       = $base.tab.h
    QMAKE_YACC_SOURCE       = $base.tab.c
    QMAKE_PREFIX_SHLIB      = lib
    QMAKE_PREFIX_STATICLIB  = lib
    QMAKE_EXTENSION_STATICLIB = a
    #
    # Base qmake configuration for GCC on *nix-systems
    #
    # Before making changes to this file, please read the comment in
    # gcc-base.conf, to make sure the change goes in the right place.
    #
    # To verify that your change has the desired effect on the final configuration
    # you can use the manual test in tests/manual/mkspecs.
    #
    
    
    QMAKE_LFLAGS_SHLIB     += -shared
    QMAKE_LFLAGS_PLUGIN    += $$QMAKE_LFLAGS_SHLIB
    QMAKE_LFLAGS_SONAME    += -Wl,-soname,
    QMAKE_LFLAGS_THREAD    +=
    QMAKE_LFLAGS_RPATH      = -Wl,-rpath,
    QMAKE_LFLAGS_RPATHLINK  = -Wl,-rpath-link,
    QMAKE_LFLAGS_NEW_DTAGS  = -Wl,--enable-new-dtags
    QMAKE_LFLAGS_USE_GOLD   = -fuse-ld=gold
    
    # -Bsymbolic-functions (ld) support
    QMAKE_LFLAGS_BSYMBOLIC_FUNC = -Wl,-Bsymbolic-functions
    QMAKE_LFLAGS_DYNAMIC_LIST   = -Wl,--dynamic-list,
    #
    # This file is used as a basis for the following compilers:
    #
    # - The GNU C++ compiler (g++)
    # - LLVM
    # - Clang
    #
    # Platform-specific options shared by these compilers are put into:
    #
    # - gcc-base-mac.conf
    # - gcc-base-unix.conf
    #
    # These base files are then combined with configurations for each compiler:
    #
    # - g++-base.conf
    # - g++-macx.conf
    # - g++-unix.conf
    # - llvm.conf
    # - clang.conf
    #
    # The combination happens in the top level mkspec, by including a platform-
    # specific version of the base-file, for example gcc-base-mac.conf, and then
    # a (possibly platform-specific) version of the actual compiler configuration,
    # for example g++-macx.conf.
    #
    # If you are making changes to any of these files, please consider the
    # possible effect it may have due to these include-rules, and whether it
    # might make more sense to share the rule or make it more specific.
    #
    # To verify that your change has the desired effect on the final configuration
    # you can use the manual test in tests/manual/mkspecs.
    #
    
    QMAKE_CFLAGS_OPTIMIZE      = -O2
    QMAKE_CFLAGS_OPTIMIZE_FULL = -O3
    
    QMAKE_CFLAGS               += -pipe
    QMAKE_CFLAGS_DEPS          += -M
    QMAKE_CFLAGS_WARN_ON       += -Wall -W
    QMAKE_CFLAGS_WARN_OFF      += -w
    QMAKE_CFLAGS_RELEASE       +=
    QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_OPTIMIZE -g
    QMAKE_CFLAGS_DEBUG         += -g
    QMAKE_CFLAGS_SHLIB         += -fPIC
    QMAKE_CFLAGS_STATIC_LIB    += -fPIC
    QMAKE_CFLAGS_APP           += -fPIC
    QMAKE_CFLAGS_ISYSTEM        =
    QMAKE_CFLAGS_YACC          += -Wno-unused -Wno-parentheses
    QMAKE_CFLAGS_HIDESYMS      += -fvisibility=hidden
    QMAKE_CFLAGS_EXCEPTIONS_OFF += -fno-exceptions
    QMAKE_CFLAGS_SPLIT_SECTIONS += -ffunction-sections
    QMAKE_CFLAGS_LTCG           = -flto -fno-fat-lto-objects
    QMAKE_CFLAGS_LTCG_FATOBJECTS = -ffat-lto-objects
    QMAKE_CFLAGS_DISABLE_LTCG   = -fno-lto
    
    QMAKE_CXXFLAGS            += $$QMAKE_CFLAGS
    QMAKE_CXXFLAGS_DEPS       += $$QMAKE_CFLAGS_DEPS
    QMAKE_CXXFLAGS_WARN_ON    += $$QMAKE_CFLAGS_WARN_ON
    QMAKE_CXXFLAGS_WARN_OFF   += $$QMAKE_CFLAGS_WARN_OFF
    QMAKE_CXXFLAGS_RELEASE    += $$QMAKE_CFLAGS_RELEASE
    QMAKE_CXXFLAGS_RELEASE_WITH_DEBUGINFO += $$QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO
    QMAKE_CXXFLAGS_DEBUG      += $$QMAKE_CFLAGS_DEBUG
    QMAKE_CXXFLAGS_SHLIB      += $$QMAKE_CFLAGS_SHLIB
    QMAKE_CXXFLAGS_STATIC_LIB += $$QMAKE_CFLAGS_STATIC_LIB
    QMAKE_CXXFLAGS_APP        += $$QMAKE_CFLAGS_APP
    QMAKE_CXXFLAGS_YACC       += $$QMAKE_CFLAGS_YACC
    QMAKE_CXXFLAGS_HIDESYMS   += $$QMAKE_CFLAGS_HIDESYMS -fvisibility-inlines-hidden
    QMAKE_CXXFLAGS_EXCEPTIONS_OFF += $$QMAKE_CFLAGS_EXCEPTIONS_OFF
    QMAKE_CXXFLAGS_SPLIT_SECTIONS += $$QMAKE_CFLAGS_SPLIT_SECTIONS
    QMAKE_CXXFLAGS_LTCG        = $$QMAKE_CFLAGS_LTCG
    QMAKE_CXXFLAGS_LTCG_FATOBJECTS = $$QMAKE_CFLAGS_LTCG_FATOBJECTS
    QMAKE_CXXFLAGS_DISABLE_LTCG   = $$QMAKE_CFLAGS_DISABLE_LTCG
    
    QMAKE_LFLAGS           +=
    QMAKE_LFLAGS_DEBUG     +=
    QMAKE_LFLAGS_APP       +=
    QMAKE_LFLAGS_RELEASE   +=
    QMAKE_LFLAGS_RELEASE_WITH_DEBUGINFO +=
    QMAKE_LFLAGS_EXCEPTIONS_OFF +=
    QMAKE_LFLAGS_LTCG       = $$QMAKE_CFLAGS_LTCG -fuse-linker-plugin
    
    QMAKE_CFLAGS_SSE2      += -msse2
    QMAKE_CFLAGS_SSE3      += -msse3
    QMAKE_CFLAGS_SSSE3     += -mssse3
    QMAKE_CFLAGS_SSE4_1    += -msse4.1
    QMAKE_CFLAGS_SSE4_2    += -msse4.2
    QMAKE_CFLAGS_AVX       += -mavx
    QMAKE_CFLAGS_AVX2      += -mavx2
    QMAKE_CFLAGS_NEON      += -mfpu=neon
    
    # Wrapper tools that understand .o/.a files with GIMPLE instead of machine code
    QMAKE_AR_LTCG           = gcc-ar cqs
    QMAKE_NM_LTCG           = gcc-nm -P
    QMAKE_RANLIB_LTCG       = true          # No need to run since gcc-ar has "s"
    
    #
    # Qmake configuration for the GNU C++ compiler on *nix-systems
    #
    # Before making changes to this file, please read the comment in
    # gcc-base.conf, to make sure the change goes in the right place.
    #
    # To verify that your change has the desired effect on the final configuration
    # you can use the manual test in tests/manual/mkspecs.
    #
    
    
    QMAKE_LFLAGS_RELEASE   += -Wl,-O1
    QMAKE_LFLAGS_NOUNDEF   += -Wl,--no-undefined
    #
    # Qmake configuration for the GNU C++ compiler
    #
    # Before making changes to this file, please read the comment in
    # gcc-base.conf, to make sure the change goes in the right place.
    #
    # To verify that your change has the desired effect on the final configuration
    # you can use the manual test in tests/manual/mkspecs.
    #
    
    QMAKE_COMPILER          = gcc
    
    QMAKE_CC                = x86_64-minimyth-linux-gnu-gcc
    
    QMAKE_LINK_C            = $$QMAKE_CC
    QMAKE_LINK_C_SHLIB      = $$QMAKE_CC
    
    QMAKE_CXX               = x86_64-minimyth-linux-gnu-g++
    
    QMAKE_LINK              = x86_64-minimyth-linux-gnu-g++
    QMAKE_LINK_SHLIB        = x86_64-minimyth-linux-gnu-g++
    
    QMAKE_PCH_OUTPUT_EXT    = .gch
    
    QMAKE_CFLAGS_PRECOMPILE       = -x c-header -c ${QMAKE_PCH_INPUT} -o ${QMAKE_PCH_OUTPUT}
    QMAKE_CFLAGS_USE_PRECOMPILE   = -include ${QMAKE_PCH_OUTPUT_BASE}
    QMAKE_CXXFLAGS_PRECOMPILE     = -x c++-header -c ${QMAKE_PCH_INPUT} -o ${QMAKE_PCH_OUTPUT}
    QMAKE_CXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE
    
    QMAKE_CXXFLAGS_CXX11    = -std=c++0x
    QMAKE_LFLAGS_CXX11      =
    warning("shell-unix.conf is deprecated and has no effect.")
    load(qt_config)
    
    1. Next I'm building qt with following configure parameters:
    CONFIGURE_ARGS = \
    	-prefix $(DESTDIR)$(qt5prefix) \
    	-bindir $(DESTDIR)$(qt5bindir) \
    	-libdir $(DESTDIR)$(qt5libdir) \
    	-docdir $(DESTDIR)$(qt5prefix)/doc \
    	-headerdir $(DESTDIR)$(qt5includedir) \
    	-datadir $(DESTDIR)$(qt5libdir) \
    	-translationdir $(DESTDIR)$(qt5prefix)/translations \
    	-sysconfdir $(DESTDIR)$(qt5libdir)/settings \
    	-examplesdir $(DESTDIR)$(qt5prefix)/examples \
    	-hostprefix $(DESTDIR)$(qt5prefix) \
    	-platform linux-g++-64 \
            -xplatform linux-g++-64-garhost \
    	-shared \
    	-largefile \
    	-confirm-license \
    	-release \
    	-opensource \
    	-opengl \
    	-no-rpath \
    	-no-optimized-qmake \
    	-plugin-sql-mysql \
    	-no-sql-db2 \
    	-no-sql-ibase \
    	-no-sql-oci \
    	-no-sql-odbc \
    	-no-sql-psql \
    	-no-sql-sqlite \
    	-no-sql-sqlite2 \
    	-no-sql-tds \
    	-no-compile-examples \
    	-no-gtkstyle \
    	-no-openvg \
    	-nomake tools \
    	-nomake examples \
    	-skip qttranslations \
    	-skip qtserialport \
    	-skip qtwebengine \
    	-skip qtwebkit-examples \
    	-verbose \
    

    Above procedure works very well for qt up to 5.5.0 family. Since 5.5.0 build is perfectly clean - but opengl is not recognised by mythtv...

    If anybody is interested - here are full build logs for 5.4.2 (opengl working) and 5.5.1 (OpenGL not working)
    5.4.2 log
    5.5.1 log


  • Lifetime Qt Champion

    Do you know how MythTV does the OpenGL detection.

    From a quick look at the logs, there's some differences in the EGLFS and KMS in the output.



  • @SGaist said in qt5.4.1->qt5.5.1 [5.9.6; 5.10.1] - OpenGL builds OK but apps don't see it:

    Do you know how MythTV does the OpenGL detection.

    From a quick look at the logs, there's some differences in the EGLFS and KMS in the output.

    Ah - Yes. Logs from 5.5.1 build are with improved custom qmake where I started to add dependencies in hope that it will help. Difference regarding EGLFS/KMS are result of adding EGL related includes/libs from mesa

    QMAKE_INCDIR_EGL        =/home/piotro/minimyth-dev/images/main/usr/include
    QMAKE_LIBDIR_EGL        =/home/piotro/minimyth-dev/images/main/usr/lib
    

    But this obviously not helps :-(

    What intriguing me that:
    -issue appearance is aligned exactly to qt release change: 5.4->5.5
    -5.5.1 build from sources is perfectly clean (IMHO)
    -prebuild 5.5.1 on achlinux with the same mythtv works OK

    I don't see issue with my approach of cross-compiling Qt (it is working for me since years starting with qt4.8 and latter with qt5.3 and 5.4) - but maybe changes in 5.5 are prohibiting my way? But why 5.5.1 build is so clean?

    anyway: myth checking opengl here:
    https://github.com/MythTV/mythtv/blob/bc20ba5a9a3bea4f5eb7ce5bf6c3e3f7e43f9e34/mythtv/libs/libmythui/mythmainwindow.cpp#L1142


  • Lifetime Qt Champion

    Did you check whether the Archlinux version of Qt uses any special configuration stuff ?



  • @SGaist said in qt5.4.1->qt5.5.1 [5.9.6; 5.10.1] - OpenGL builds OK but apps don't see it:

    Did you check whether the Archlinux version of Qt uses any special configuration stuff ?

    Of course. Arch has no any special things except:
    -archlinux is not cross-compiling
    -it has enabled (+ required dependencies) for all graphics variants (wayland, etc)

    here is arch build script:
    qt5.11 archlinux build script


  • Lifetime Qt Champion

    Strange, they disable the examples but still build the tests...

    Anyway, from what architecture are you cross-compiling from ?



  • @SGaist said in qt5.4.1->qt5.5.1 [5.9.6; 5.10.1] - OpenGL builds OK but apps don't see it:

    Strange, they disable the examples but still build the tests...

    Anyway, from what architecture are you cross-compiling from ?

    • underlying os where build system runs is archlinux

    • build system is GAR (GAR it is make based environment to build since scratch complete toolchain and next cross build all packages to create target appliance called minimyth2

    • target system is minimyth2

    Architecturally:

    • underlying os is x86_64 (can be anything)
    • GAR is x86_64
    • minimyth2 can be: i386, x86_64, armv7 and aarch64

    so far I have well working minimyth2 with qt5.4.1 for: i386, x86_64 and aarch64 (bcm2837). armv7 not tested yet.

    So answering Your question: I'm cross compiling from x86_64 (GAR) to x86_64 (chosen minimyth2 target architecture in this exercise).


  • Lifetime Qt Champion

    Ok, so in fact, your current test setup isn't really cross-compiling since you start and end with the exact same architecture.

    What hardware are you using to run minimyth2 ?



  • @SGaist said in qt5.4.1->qt5.5.1 [5.9.6; 5.10.1] - OpenGL builds OK but apps don't see it:

    Ok, so in fact, your current test setup isn't really cross-compiling since you start and end with the exact same architecture.

    Well - I would say: it IS cross compiling but in this exercise build, host and target are all x86_64. But only cpu arch is single common part.
    All other vital components (gcc, glibc, binutils, kernel, qt, etc are different).

    So pls don't be mislead: situation that build and target have declared the same architecture not means that there is no cross-compile.

    What hardware are you using to run minimyth2 ?

    It is any x86 or selected armv7 / aarch64 (bcm2837 tested)
    For x86 I have users with: Intel NUC, ION1, ION2, multiple AMD (Kabini, Richland, etc).
    Basically I'm supporting any x86 CPU and 1503 gfx cards out-of-box (with full auto detection and auto-configure)



  • I started to play with myth code to see what qt5.10.1 provides.
    After disabling OpenGL checks I started to see:

    QXcbIntegration: Cannot create platform OpenGL context, neither GLX nor EGL are enabled
    

    Of course I have libglx.so in /home/piotro/minimyth-dev/images/main/usr/lib/xorg/modules/extensions.

    qt config summary also says GLX on X11:yes

    X11:
      Using system-provided XCB libraries .. yes
      EGL on X11 ........................... yes
      Xinput2 .............................. yes
      XCB XKB .............................. yes
      XLib ................................. yes
      XCB render ........................... yes
      XCB GLX .............................. yes
      XCB Xlib ............................. yes
      Using system-provided xkbcommon ...... yes
      Native painting (experimental) ....... yes
    

    What are other possible reasons for such error?


  • Lifetime Qt Champion

    I wonder if it's a question of libraries versions.


  • Moderators

    Consider running conifugre with verbose flag - you'll be able to see what libs it is looking for an maybe whether there are some warnings popping up.



  • @SGaist said in qt5.4.1->qt5.5.1 [5.9.6; 5.10.1] - OpenGL builds OK but apps don't see it:

    I wonder if it's a question of libraries versions.

    I was thinking about this as well.
    I made test build with qt build-in xcb (assuming bundled xcb for sure is OK).
    OpenGL still not works.
    Currently I think qt5.5+ has changed opengl subsystem in a way that my cross-build procedure earlier described in this thread (my message from 8 days ago) will not work anymore.

    I think it is qt bug as:

    • conceptually procedure is OK (IMHO)
    • procedure works for qt5.4 and earlier
    • qt5.10 configure says Yes in all places where needed
    • qt5.10 build reports no errors nor related warnings


  • @sierdzio
    Pls look at my earlier post where I put links to full build log with -verbose flag in configure.
    Pls look at 5.5.1.log (as 5.5 is first qt ver. where opengl not works for me.)
    Maybe You will discover something meaningful in build log.
    I can't :-(



  • ok - I found it.
    Issue was typo in filename of xcbintegration libs in my install script. argh....
    5.4.x family don't have those libs while 5.5+ has.
    I added images of those libs to boot image - but 2 letters in filename were in reverse order....

    thx anybody who was trying to help me!


  • Lifetime Qt Champion

    Glad you found out and thanks for sharing !

    What was the additional file you had wrong ?



  • @SGaist said in qt5.4.1->qt5.5.1 [5.9.6; 5.10.1] - OpenGL builds OK but apps don't see it:

    Glad you found out and thanks for sharing !

    What was the additional file you had wrong ?

    oh it was

    libqxcb-glx-integration.so
    

    in

    /usr/lib/qt5/plugins/xcbglintegrations
    

    dir
    This .so is new addition since 5.5.
    may ppl has issues with nonworking OpenGL due missing this library after upgrade to 5.5 but forgotten to install this lib. (there is also EGL version of this lib btw)
    It is usually because packagers are frequently putting them the into separate package called usually xcbglintegrations plugins or similar.

    btw: I'm really impressed in increasing quality of qt regarding building process.


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