raspberry pi cross compiling

NR5P

I think learning c++ is easier than trying to get setup for cross compiling on the raspberry pi.

I have a raspberry pi 3 with raspbian. My development computer is kubuntu 18.04.

I'm following instructions here https://wiki.qt.io/RaspberryPi2EGLFS.

First off step 10. states If your system is 64 bit you may also edit device option to:

-device-option CROSS_COMPILE=~/raspi/tools/arm-bcm2708/gcc-linaro- arm-linux-gnueabihf-raspbian-x64/bin/arm-linux-gnueabihf-

I was not even aware there was a 64 bit option for raspbian? It's not talking about my local system is it?

As for the issues I'm running into, (unless I'm supposed to use the device-option above), I'm getting to the point of this, I'm putting 5.12 for my qt version

git clone git://code.qt.io/qt/qtbase.git -b <qt-version>
cd qtbase
./configure -release -opengl es2 -device <rpi-version> -device-option      CROSS_COMPILE=~/raspi/tools/arm-bcm2708/gcc-linaro-arm-linux-  gnueabihf-raspbian/bin/arm-linux-gnueabihf- -sysroot ~/raspi/sysroot   -opensource -confirm-license -make libs -prefix /usr/local/qt5pi -extprefix   ~/raspi/qt5pi -hostprefix ~/raspi/qt5 -v

make
make install

However when I do ./configure here is the error I'm getting along with build options read out before it hits the error.

Build options:
  Mode ................................... release
  Optimize release build for size ........ no
  Building shared libraries .............. yes
  Using C standard ....................... C11
  Using C++ standard ..................... C++11
  Using ccache ........................... no
  Using gold linker ...................... no
  Using new DTAGS ........................ yes
  Using precompiled headers .............. yes
  Using LTCG ............................. no
  Target compiler supports:
   NEON ................................. yes
  Build parts ............................ libs
Qt modules and options:
  Qt Concurrent .......................... yes
  Qt D-Bus ............................... yes
  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 ...................... no
Qt Core:
  DoubleConversion ....................... yes
    Using system DoubleConversion ........ no
  GLib ................................... no
  iconv .................................. yes
  ICU .................................... no
  Tracing backend ........................ <none>
  Logging backends:
    journald ............................. no
    syslog ............................... no
    slog2 ................................ no
  Using system PCRE2 ..................... no
Qt Network:
  getifaddrs() ........................... yes
  IPv6 ifname ............................ yes
  libproxy ............................... no
  Linux AF_NETLINK ....................... yes
  OpenSSL ................................ no
    Qt directly linked to OpenSSL ........ no
  OpenSSL 1.1 ............................ no
  DTLS ................................... no
  SCTP ................................... no
  Use system proxies ..................... yes
Qt Gui:
  Accessibility .......................... yes
  FreeType ............................... yes
    Using system FreeType ................ no
  HarfBuzz ............................... yes
    Using system HarfBuzz ................ no
  Fontconfig ............................. no
  Image formats:
    GIF .................................. yes
    ICO .................................. yes
     JPEG ................................. yes
       Using system libjpeg ............... no
    PNG .................................. yes
      Using system libpng ................ no
  EGL .................................... no
  OpenVG ................................. no
  OpenGL:
Desktop OpenGL ....................... no
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 ................................. no
    XCB Xlib ............................. no
    EGL on X11 ........................... no
QPA backends:
  DirectFB ............................... no
   EGLFS .................................. no
  LinuxFB ................................ yes
  VNC .................................... yes
  Mir client ............................. no
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 ......... no
  TDS (Sybase) ........................... no
Qt Testlib:
  Tester for item models ................. yes

Note: Also available for Linux: linux-clang linux-icc

ERROR: Feature 'opengles2' was enabled, but the pre-condition 'config.win32     || (!config.watchos && !features.opengl-desktop && libs.opengl_es2)' failed.

ERROR: The OpenGL functionality tests failed!
You might need to modify the include and library search paths by editing       QMAKE_INCDIR_OPENGL[_ES2],
QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] in the mkspec for your platform.

jsulm

@NR5P said in raspberry pi cross compiling:

I think learning c++ is easier than trying to get setup for cross compiling on the raspberry pi

I disagree. Why do you want to use Raspberry Pi and cross compiling just to learn C++? Cross compiling is a complex area and makes it harder to even get a working development environment. It is way easier to either write code for your PC or do it on Raspberry Pi.

NR5P

Sorry meant to say learning c++ seemed easier. I'm building an automation program with QT. https://github.com/NR5P/homestead_automation . I try to work on stuff when I get time at work and I figured cross compiling would make it easier to work on it and test when I'm not at home. I don't really want to bring the pi with me.

jsulm

@NR5P It looks like OpenGL/ES header/libs are missing in your sysroot.
You can call configure with -v parameter to see what exactly is missing.

QURORO

Using the sourcecode qt-everywhere-src-5.12.0 will be fine.
https://mechatronicsblog.com/cross-compile-and-deploy-qt-5-12-for-raspberry-pi/

If the sourcecode version newer than 5.12.0, it must getting "The OpenGL functionality tests failed!" Error.

None of [libGLESv2.so libGLESv2.a] found in [/home/alex/raspi/sysroot/usr/lib/arm-linux-gnueabihf] and global paths.
=> source produced no result.

I have check those files is really exist, but system can not detected.