Qt configuration for Linux: What is the default for default Qt libraries?

[Younoussa 0]

I build Qt 5.15 for Linux and observed link issues when linking 3rd party libraries that used a different Qt build.
The libraries in question are built with Qt provided binaries for Linux.
Is there a documentation pointing to the used configuration for Qt libraries? If not is there a way to find/query them?

Notes:

• Everything works fine if I use Qt provided binaries
• Some of the errors look like:

  undefined reference to `std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::find(char, unsigned long) const@Qt_5'
  

Configuration output

root@85968a17170e:/home/buildmasterx/qt-everywhere-src-5.15.1/qt5-build# ../configure --prefix=/opt/Qt/5.15.1/gcc_64 \
>             -platform linux-g++ \
>             -release \
>             -opensource \
>             -confirm-license \
>             -no-rpath \
>             -nomake tests \
>             -optimized-qmake \
>             -no-cups \
>             -system-zlib \
>             -no-pch \
>             -no-pkg-config \
>             -shared \
>             -no-iconv \
>             -no-kms \
>             -no-sql-mysql \
>             -no-sql-psql \
>             -system-sqlite \
>             -gui \
>             -no-harfbuzz \
>             -widgets \
>             -no-xcb \
>             -no-eglfs \
>             -openssl \
>             -no-dbus \
>             -no-tslib \
>             -no-glib \
>             -icu \
>             -nomake examples \
>             -no-libinput \
>             -skip qtconnectivity \
>             -skip qtlottie \
>             -skip qtdatavis3d \
>             -skip qtgamepad \
>             -skip qtlocation\
>             -skip qtnetworkauth \
>             -skip qtpurchasing \
>             -skip qtquick3d \
>             -skip qtremoteobjects \
>             -skip qtscript \
>             -skip qtscxml \
>             -skip qtsensors \
>             -skip qtserialbus \
>             -skip qtserialport \
>             -skip qtwebchannel \
>             -skip qtwebsockets \
>             -skip qtwebview \
>             -skip qtdoc \
>             -skip qtpim \
>             -skip qtdocgallery \
>             -skip qtfeedback \
>             -skip qtqa
+ cd qtbase
+ /home/buildmasterx/qt-everywhere-src-5.15.1/qtbase/configure -top-level --prefix=/opt/Qt/5.15.1/gcc_64 -platform linux-g++ -release -opensource -confirm-license -no-rpath -nomake tests -optimized-qmake -no-cups -system-zlib -no-pch -no-pkg-config -shared -no-iconv -no-kms -no-sql-mysql -no-sql-psql -system-sqlite -gui -no-harfbuzz -widgets -no-xcb -no-eglfs -openssl -no-dbus -no-tslib -no-glib -icu -nomake examples -no-libinput -skip qtconnectivity -skip qtlottie -skip qtdatavis3d -skip qtgamepad -skip qtlocation -skip qtnetworkauth -skip qtpurchasing -skip qtquick3d -skip qtremoteobjects -skip qtscript -skip qtscxml -skip qtsensors -skip qtserialbus -skip qtserialport -skip qtwebchannel -skip qtwebsockets -skip qtwebview -skip qtdoc -skip qtpim -skip qtdocgallery -skip qtfeedback -skip qtqa
Preparing build tree...
Creating qmake...
...............................................................................................Done.

This is the Qt Open Source Edition.

You have already accepted the terms of the Open Source license.

Running configuration tests...
Checking for machine tuple... yes
Checking for valid makespec... yes
Checking for target architecture... x86_64
Checking for SSE2 instructions... yes
Checking for AES new instructions... yes
Checking for alloca() in alloca.h... yes
Checking for SSE3 instructions... yes
Checking for SSSE3 instructions... yes
Checking for SSE4.1 instructions... yes
Checking for SSE4.2 instructions... yes
Checking for AVX instructions... yes
Checking for AVX2 instructions... yes
Checking for AVX512 F instructions... yes
Checking for AVX512 BW instructions... yes
Checking for AVX512 CD instructions... yes
Checking for AVX512 DQ instructions... yes
Checking for AVX512 ER instructions... yes
Checking for AVX512 IFMA instructions... yes
Checking for AVX512 PF instructions... yes
Checking for AVX512 VBMI instructions... yes
Checking for AVX512 VL instructions... yes
Checking for C++14 support... yes
Checking for C++17 support... yes
Checking for C99 support... yes
Checking for C11 support... yes
Checking for dlopen()... yes
Checking for new dtags support... yes
Checking for F16C instructions... yes
Checking for D-Bus >= 1.2 (host)... yes
Checking for Support for Intel Control-flow Enforcement Technology... no
Checking for udev... no
Checking for POSIX fallocate()... yes
Checking for RDRAND instruction... yes
Checking for RDSEED instruction... no
Checking for symbol visibility support... yes
Checking for -Bsymbolic-functions support... yes
Checking for SHA new instructions... yes
Checking for Signaling NaN for doubles... yes
Checking for STL compatibility... yes
Checking for zlib... yes
Checking for Intrinsics without -mXXX argument... yes
Checking for Zstandard... no
Checking for clock_gettime()... yes
Checking for POSIX monotonic clock... yes
Checking for C++11 <future>... yes
Checking for eventfd... yes
Checking for futimens()... yes
Checking for getauxval()... yes
Checking for getentropy()... yes
Checking for GNU libc... yes
Checking for ICU... yes
Checking for inotify... yes
Checking for SysV IPC... yes
Checking for linkat()... yes
Checking for ppoll()... yes
Checking for PCRE2... no
Checking for renameat2()... no
Checking for slog2... no
Checking for statx() in libc... no
Checking for 64 bit atomics... yes
Checking for DoubleConversion... no
Checking for O_CLOEXEC... yes
Checking for C++11 <random>... yes
Checking for working std::atomic for function pointers... yes
Checking for OpenSSL Headers... yes
Checking for DTLS support in OpenSSL... yes
Checking for getifaddrs()... yes
Checking for KRB5 GSSAPI Support... no
Checking for IPv6 ifname... yes
Checking for Linux AF_NETLINK sockets... yes
Checking for OCSP stapling support in OpenSSL... yes
Checking for Desktop OpenGL... yes
Checking for KMS... no
Checking for EGL... no
Checking for evdev... yes
Checking for FreeType... yes
Checking for Fontconfig... yes
Checking for GBM... no
Checking for LinuxFB... yes
Checking for mtdev... no
Checking for OpenVG... no
Checking for default QPA platform... xcb
Checking for libjpeg... no
Checking for libpng... yes
Checking for libmd4c... no
Checking for Vulkan... no
Checking for XLib... yes
Checking for XCB >= 1.11... yes
Checking for XCB Xlib... yes
Checking for xkbcommon >= 0.5.0... no
Checking for DB2 (IBM)... no
Checking for InterBase... no
Checking for OCI (Oracle)... no
Checking for ODBC... no
Checking for SQLite (version 2)... no
Checking for TDS (Sybase)... no
Checking for SQLite (version 3)... yes
Checking for 64bit pointers... yes
Checking for python... /usr/bin/python
Checking for Direct3D 12... no
Checking for Assimp... no
Checking for Autodesk FBX... no
Checking for Wayland client library... no
Checking for Wayland EGL library... no
Checking for wayland-server... no
Checking for ALSA... yes
Checking for GStreamer 1.0... no
Checking for GStreamer 0.10... no
Checking for Video for Linux... yes
Checking for OpenAL... no
Checking for PulseAudio >= 0.9.10... no
Checking for libresourceqt5... no
Checking for Flite... no
Checking for Speech Dispatcher... no
Checking for libclang... no
Checking for architecture supported... yes
Checking for bison... no
Checking for submodule initialized... yes
Checking for build path without whitespace... yes
Checking for platform supported... 
Checking for gperf... no
Checking for flex... no
Checking for host pkg-config... /usr/bin/pkg-config
Checking for jumbo build merge limit... 8
Checking for linker supports -z noexecstack... yes
Checking for python2... /usr/bin/python2
Checking for d-bus... no
Checking for fontconfig... no
Checking for freetype >= 2.4.2... no
Checking for glib-2.0 >= 2.32.0... no
Checking for glibc > 2.16... yes
Checking for jsoncpp... no
Checking for khr... yes
Checking for lcms2... no
Checking for libdrm... no
Checking for libevent... no
Checking for libvpx... no
Checking for libwebp, libwebpmux and libwebpdemux... no
Checking for compatible libxml2 and libxslt... no
Checking for minizip... no
Checking for system ninja... no
Checking for nss >= 3.26... no
Checking for opus... no
Checking for libpng >= 1.6.0... no
Checking for protobuf... no
Checking for re2... no
Checking for snappy... no
Checking for x11... no
Checking for xcomposite... no
Checking for xcursor... no
Checking for xi... no
Checking for xtst... no
Checking for zlib... no
Done running configuration tests.

Configure summary:

Build type: linux-g++ (x86_64, CPU features: mmx sse sse2)
Compiler: gcc 5.5.0
Configuration: sse2 aesni sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl compile_examples enable_new_dtags f16c largefile rdrnd shani x86SimdAlways shared shared release c++11 c++14 c++17 c++1z concurrent no-pkg-config reduce_exports reduce_relocations release_tools stl
Build options:
  Mode ................................... release; optimized tools
  Optimize release build for size ........ no
  Building shared libraries .............. yes
  Using C standard ....................... C11
  Using C++ standard ..................... C++17
  Using ccache ........................... no
  Using new DTAGS ........................ yes
  Relocatable ............................ yes
  Using precompiled headers .............. no
  Using LTCG ............................. no
  Target compiler supports:
    SSE .................................. SSE2 SSE3 SSSE3 SSE4.1 SSE4.2
    AVX .................................. AVX AVX2
    AVX512 ............................... F ER CD PF DQ BW VL IFMA VBMI
    Other x86 ............................ AES F16C RDRAND SHA
    Intrinsics without -mXXX option ...... yes
  Build parts ............................ libs tools
Qt modules and options:
  Qt Concurrent .......................... yes
  Qt D-Bus ............................... no
  Qt D-Bus directly linked to libdbus .... no
  Qt Gui ................................. yes
  Qt Network ............................. yes
  Qt Sql ................................. yes
  Qt Testlib ............................. yes
  Qt Widgets ............................. yes
  Qt Xml ................................. yes
Support enabled for:
  Using pkg-config ....................... no
  udev ................................... no
  Using system zlib ...................... yes
  Zstandard support ...................... no
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ no
  GLib ................................... no
  iconv .................................. no
  ICU .................................... yes
  Built-in copy of the MIME database ..... yes
  Tracing backend ........................ <none>
  Logging backends:
    journald ............................. no
    syslog ............................... no
    slog2 ................................ no
  PCRE2 .................................. yes
    Using system PCRE2 ................... no
Qt Network:
  getifaddrs() ........................... yes
  IPv6 ifname ............................ yes
  libproxy ............................... no
  Linux AF_NETLINK ....................... yes
  OpenSSL ................................ yes
    Qt directly linked to OpenSSL ........ no
  OpenSSL 1.1 ............................ yes
  DTLS ................................... yes
  OCSP-stapling .......................... yes
  SCTP ................................... no
  Use system proxies ..................... yes
  GSSAPI ................................. no
Qt Gui:
  Accessibility .......................... yes
  FreeType ............................... yes
    Using system FreeType ................ yes
  HarfBuzz ............................... no
    Using system HarfBuzz ................ no
  Fontconfig ............................. yes
  Image formats:
    GIF .................................. yes
    ICO .................................. yes
    JPEG ................................. yes
      Using system libjpeg ............... no
    PNG .................................. yes
      Using system libpng ................ yes
  Text formats:
    HtmlParser ........................... yes
    CssParser ............................ yes
    OdfWriter ............................ yes
    MarkdownReader ....................... yes
      Using system libmd4c ............... no
    MarkdownWriter ....................... yes
  EGL .................................... no
  OpenVG ................................. no
  OpenGL:
    Desktop OpenGL ....................... yes
    OpenGL ES 2.0 ........................ no
    OpenGL ES 3.0 ........................ no
    OpenGL ES 3.1 ........................ no
    OpenGL ES 3.2 ........................ no
  Vulkan ................................. no
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... no
  INTEGRITY HID .......................... no
  mtdev .................................. no
  tslib .................................. no
  xkbcommon .............................. no
  X11 specific:
    XLib ................................. yes
    XCB Xlib ............................. yes
    EGL on X11 ........................... no
    xkbcommon-x11 ........................ no
QPA backends:
  DirectFB ............................... no
  EGLFS .................................. no
  LinuxFB ................................ yes
  VNC .................................... yes
Qt Sql:
  SQL item models ........................ yes
Qt Widgets:
  GTK+ ................................... no
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... no
Qt Sql Drivers:
  DB2 (IBM) .............................. no
  InterBase .............................. no
  MySql .................................. no
  OCI (Oracle) ........................... no
  ODBC ................................... no
  PostgreSQL ............................. no
  SQLite2 ................................ no
  SQLite ................................. yes
    Using system provided SQLite ......... yes
  TDS (Sybase) ........................... no
Qt Testlib:
  Tester for item models ................. yes
Further Image Formats:
  JasPer ................................. no
  MNG .................................... no
  TIFF ................................... yes
    Using system libtiff ................. no
  WEBP ................................... yes
    Using system libwebp ................. no
Qt QML:
  QML network support .................... yes
  QML debugging and profiling support .... yes
  QML just-in-time compiler .............. yes
  QML sequence object .................... yes
  QML XML http request ................... yes
  QML Locale ............................. yes
Qt QML Models:
  QML list model ......................... yes
  QML delegate model ..................... 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
  TableView item ......................... yes
  Path support ........................... yes
  PathView item .......................... yes
  Positioner items ....................... yes
  Repeater item .......................... yes
  ShaderEffect item ...................... yes
  Sprite item ............................ yes
Qt 3D:
  Assimp ................................. yes
  System Assimp .......................... no
  Output Qt3D GL traces .................. no
  Use SSE2 instructions .................. yes
  Use AVX2 instructions .................. no
  Aspects:
    Render aspect ........................ yes
    Input aspect ......................... yes
    Logic aspect ......................... yes
    Animation aspect ..................... yes
    Extras aspect ........................ yes
Qt 3D Renderers:
  OpenGL Renderer ........................ yes
  RHI Renderer ........................... no
Qt 3D GeometryLoaders:
  Autodesk FBX ........................... no
Qt Wayland Client ........................ no
Qt Wayland Compositor .................... no
Qt Quick Controls 2:
  Styles ................................. Default Fusion Imagine Material Universal
Qt Quick Templates 2:
  Hover support .......................... yes
  Multi-touch support .................... yes
QtXmlPatterns:
  XML schema support ..................... yes
Qt Multimedia:
  ALSA ................................... yes
  GStreamer 1.0 .......................... no
  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
Qt TextToSpeech:
  Flite .................................. no
  Flite with ALSA ........................ no
  Speech Dispatcher ...................... no
Qt Tools:
  Qt Assistant ........................... yes
  Qt Designer ............................ yes
  Qt Distance Field Generator ............ yes
  kmap2qmap .............................. yes
  Qt Linguist ............................ yes
  Mac Deployment Tool .................... no
  makeqpf ................................ yes
  pixeltool .............................. yes
  qdbus .................................. yes
  qev .................................... yes
  Qt Attributions Scanner ................ yes
  qtdiag ................................. yes
  qtpaths ................................ yes
  qtplugininfo ........................... yes
  Windows deployment tool ................ no
  WinRT Runner Tool ...................... no
Qt Tools:
  QDoc ................................... no
Qt WebEngine Build Tools:
  Use System Ninja ....................... no
  Use System Gn .......................... no
  Jumbo Build Merge Limit ................ 8
  Developer build ........................ no
  Sanitizer .............................. no
  QtWebEngine required system libraries:
    fontconfig ........................... no
    dbus ................................. no
    nss .................................. no
    khr .................................. yes
    glibc ................................ yes
  Optional system libraries used:
    re2 .................................. no
    icu .................................. no
    libwebp, libwebpmux and libwebpdemux . no
    opus ................................. no
    ffmpeg ............................... no
    libvpx ............................... no
    snappy ............................... no
    glib ................................. no
    zlib ................................. no
    minizip .............................. no
    libevent ............................. no
    jsoncpp .............................. no
    protobuf ............................. no
    libxml2 and libxslt .................. no
    lcms2 ................................ no
    png .................................. no
    JPEG ................................. no
    harfbuzz ............................. no
    freetype ............................. no

Note: -optimized-tools is not useful in -release mode.

Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.

Note: The following modules are not being compiled in this configuration:
    webenginecore
    webengine
    webenginewidgets
    pdf
    pdfwidgets

WARNING: QDoc will not be compiled, probably because libclang could not be located. This means that you cannot build the Qt documentation.

Either ensure that llvm-config is in your PATH environment variable, or set LLVM_INSTALL_DIR to the location of your llvm installation.
On Linux systems, you may be able to install libclang by installing the libclang-dev or libclang-devel package, depending on your distribution.
On macOS, you can use Homebrew's llvm package.
On Windows, you must set LLVM_INSTALL_DIR to the installation path.

WARNING: Tool gperf is required to build QtWebEngine.

WARNING: Tool gperf is required to build QtPdf.

WARNING: QtWebEngine will not be built.

WARNING: QtPdf will not be built.

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/opt/Qt/5.15.1/gcc_64'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

[jsulm]

@Younoussa-0 said in Qt configuration for Linux: What is the default for default Qt libraries?:

when linking 3rd party libraries that used a different Qt build

This can't work - you have to build those libraries with the same Qt version.
What are those 3rd party libraries?

[Younoussa 0]

@jsulm I cannot provide the library names but we are using the same Qt version, just that the Qt binaries are built differently.
They use default Qt libraries and I'm trying to build my own for practical reasons, eg. using a container for CI builds.