*** cannot compile in 16gb ***

tce-load -i compiletc Xorg-7.7-3d-dev sqlite3-dev libmng-dev libpng-dev tiff-dev cups-dev pulseaudio-dev perl5 gst-plugins-base-dev libwebp1-dev mtdev-dev ruby-dev geoclue-dev libpci-dev nss-dev git libxkbcommon-dev gperf libgcrypt-dev libgnome-keyring-dev libinput-dev harfbuzz-icu-dev wayland-protocols jasper-dev ibus-dev pcre2-dev gzip bash libxslt-dev zstd-dev libvulkan-dev python ffmpeg4-dev double-conversion-dev

wget https://download.qt.io/archive/qt/5.15/5.15.10/single/qt-everywhere-opensource-src-5.15.10.tar.xz
wget https://www.linuxfromscratch.org/patches/blfs/svn/qt-everywhere-opensource-src-5.15.10-kf5-1.patch

cd qt-everywhere-src-5.15.10

patch -Np1 -i ../qt-everywhere-opensource-src-5.15.10-kf5-1.patch

mkdir -pv qtbase/.git

sed -e "/pragma once/a#include <cstdint>" -i qtlocation/src/3rdparty/mapbox-gl-native/include/mbgl/util/geometry.hpp qtlocation/src/3rdparty/mapbox-gl-native/include/mbgl/util/string.hpp qtlocation/src/3rdparty/mapbox-gl-native/src/mbgl/gl/stencil_mode.hpp

edit qtbase/configure
#!/bin/sh -> #!/bin/bash

edit qtbase/mkspecs/common/gcc-base.conf
O2/O3 -> Os
QMAKE_CFLAGS               += -mtune=generic -pipe

CC="gcc -mtune=generic -Os -pipe" CXX="g++ -mtune=generic -Os -pipe" ./configure -prefix /usr/local -archdatadir /usr/local/lib/qt5 -bindir /usr/local/bin -plugindir /usr/local/lib/qt5/plugins -importdir /usr/local/lib/qt5/imports -headerdir /usr/local/include/qt5 -datadir /usr/local/share/qt5 -docdir /usr/local/share/doc/qt5 -translationdir /usr/local/share/qt5/translations -examplesdir /usr/local/share/doc/qt5/examples -libexecdir /usr/local/lib/qt5 -sysconfdir /usr/local/etc/xdg -qmldir /usr/local/lib/qt5/qml -confirm-license -opensource -release -dbus-linked -openssl-linked -system-freetype -system-harfbuzz -system-libjpeg -system-libpng -system-pcre -system-sqlite -system-zlib -nomake examples -optimized-qmake -no-use-gold-linker -no-rpath -skip qtwebengine

[fails with gold-linker]

time make [3h 24m 53s]
sudo make install


find /usr/local/ -name \*.prl -exec sed -i -e '/^QMAKE_PRL_BUILD_DIR/d' {} \;

for file in moc uic rcc qmake lconvert lrelease lupdate; do
  ln -sfrvn /usr/local/bin/$file /usr/local/bin/$file-qt5
done

sudo install -dm755 /usr/local/share/pixmaps

sudo install -Dm644 qttools/src/assistant/assistant/images/assistant-128.png /usr/local/share/pixmaps/assistant-qt5.png

sudo install -Dm644 qttools/src/designer/src/designer/images/designer.png /usr/local/share/pixmaps/designer-qt5.png

sudo install -Dm644 qttools/src/linguist/linguist/images/icons/linguist-128-32.png /usr/local/share/pixmaps/linguist-qt5.png

sudo install -Dm644 qttools/src/qdbus/qdbusviewer/images/qdbusviewer-128.png /usr/local/share/pixmaps/qdbusviewer-qt5.png


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 .............. yes
  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 ............................... 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
  udev ................................... yes
  Using system zlib ...................... yes
  Zstandard support ...................... yes
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ yes
  GLib ................................... yes
  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 ................... yes
Qt Network:
  getifaddrs() ........................... yes
  IPv6 ifname ............................ yes
  libproxy ............................... no
  Linux AF_NETLINK ....................... yes
  OpenSSL ................................ yes
    Qt directly linked to OpenSSL ........ yes
  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 ............................... 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
  Text formats:
    HtmlParser ........................... yes
    CssParser ............................ yes
    OdfWriter ............................ yes
    MarkdownReader ....................... yes
      Using system libmd4c ............... no
    MarkdownWriter ....................... yes
  EGL .................................... yes
  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 ................................. yes
  Session Management ..................... yes
Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... yes
  INTEGRITY HID .......................... no
  mtdev .................................. yes
  tslib .................................. no
  xkbcommon .............................. yes
  X11 specific:
    XLib ................................. yes
    XCB Xlib ............................. yes
    EGL on X11 ........................... yes
    xkbcommon-x11 ........................ yes
QPA backends:
  DirectFB ............................... no
  EGLFS .................................. yes
  EGLFS details:
    EGLFS OpenWFD ........................ no
    EGLFS i.Mx6 .......................... no
    EGLFS i.Mx6 Wayland .................. no
    EGLFS RCAR ........................... no
    EGLFS EGLDevice ...................... yes
    EGLFS GBM ............................ yes
    EGLFS VSP2 ........................... no
    EGLFS Mali ........................... no
    EGLFS Raspberry Pi ................... no
    EGLFS X11 ............................ yes
  LinuxFB ................................ yes
  VNC .................................... yes
  XCB:
    Using system-provided xcb-xinput ..... yes
    Native painting (experimental) ....... no
    GL integrations:
      GLX Plugin ......................... yes
        XCB GLX .......................... yes
      EGL-X11 Plugin ..................... yes
Qt Sql:
  SQL item models ........................ yes
Qt Widgets:
  GTK+ ................................... yes
  Styles ................................. Fusion Windows
Qt PrintSupport:
  CUPS ................................... yes
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
Serial Port:
  ntddmodm ............................... no
Qt SerialBus:
  Socket CAN ............................. yes
  Socket CAN FD .......................... yes
  SerialPort Support ..................... yes
Further Image Formats:
  JasPer ................................. yes
  MNG .................................... yes
  TIFF ................................... yes
    Using system libtiff ................. yes
  WEBP ................................... yes
    Using system libwebp ................. yes
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
QtQuick3D:
  Assimp ................................. yes
  System Assimp .......................... no
Qt Scxml:
  ECMAScript data model for QtScxml ...... yes
Qt Gamepad:
  SDL2 ................................... 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 Drivers:
  EGL .................................... yes
  Raspberry Pi ........................... no
  XComposite EGL ......................... yes
  XComposite GLX ......................... yes
  DRM EGL ................................ yes
  libhybris EGL .......................... no
  Linux dma-buf server buffer integration . yes
  Vulkan-based server buffer integration . yes
  Shm emulation server buffer integration . yes
Qt Wayland Client Shell Integrations:
  xdg-shell .............................. yes
  xdg-shell unstable v5 (deprecated) ..... yes
  xdg-shell unstable v6 .................. yes
  ivi-shell .............................. yes
  wl-shell (deprecated) .................. yes
Qt Wayland Client ........................ yes
Qt Wayland Compositor .................... yes
Qt Wayland Compositor Layer Plugins:
  VSP2 hardware layer integration ........ no
Qt Bluetooth:
  BlueZ .................................. yes
  BlueZ Low Energy ....................... yes
  Linux Crypto API ....................... yes
  Native Win32 Bluetooth ................. no
  WinRT Bluetooth API (desktop & UWP) .... no
  WinRT advanced bluetooth low energy API (desktop & UWP) . no
Qt Sensors:
  sensorfw ............................... no
Qt Quick Controls 2:
  Styles ................................. Default Fusion Imagine 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:
  Qt.labs.location experimental QML plugin . yes
  Geoservice plugins:
    OpenStreetMap ........................ yes
    HERE ................................. yes
    Esri ................................. yes
    Mapbox ............................... yes
    MapboxGL ............................. yes
    Itemsoverlay ......................... yes
QtXmlPatterns:
  XML schema support ..................... yes
Qt Multimedia:
  ALSA ................................... yes
  GStreamer 1.0 .......................... yes
  GStreamer 0.10 ......................... no
  Video for Linux ........................ yes
  OpenAL ................................. yes
  PulseAudio ............................. yes
  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