qt 5.10.12 cross compile for rk3399 (aarch64-linux-gnu-gcc) qmake "Exec format error"

[guruhb]

Host : Debian 9 (Tried on Ubuntu 18.04 with same steps),
Target : rk3399 running with Debian 9

1. Fetch source, configure , make, make install

$wget https://download.qt.io/official_releases/qt/5.12/5.12.10/single/qt-everywhere-src-5.12.10.tar.xz 
$tar xf qt-everywhere-src-5.12.10.tar.xz && cd 
// "aarch64-linux-gnu-gcc" used with  https://releases.linaro.org/components/toolchain/binaries/7.2-2017.11/aarch64-linux-gnu/gcc-linaro-7.2.1-2017.11-x86_64_aarch64-linux-gnu.tar.xz
$ ./configure \
-prefix /home/guruhb/rk3399/qt5.10.12-aarch64 \
-confirm-license \
-opensource \
-release \
-make libs \
-xplatform linux-aarch64-gnu-g++ \
-pch \
-qt-libjpeg \
-qt-libpng \
-qt-zlib \
-no-opengl \
-no-sse2 \
-no-openssl \
-no-cups \
-no-glib \
-no-dbus \
-no-xcb \
-no-separate-debug-info \
-v \
-recheck-all

$ make && make install 
$ file qmake 
qmake: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32 

2. Compressed "/home/guruhb/rk3399/qt5.10.12-aarc64" and extracted on the target (rk3399 running on Debian 9 desktop) and configured

export QTDIR=/usr/local/qt5.10.12-aarch64 
export LD_LIBRARY_PATH=/usr/local/qt5.10.12-aarch64/lib:$LD_LIBRARY_PATH
export QT_QPA_PLATFORM_PLUGIN_PATH=$QTDIR/plugins
export QT_QPA_PLATFORM=linuxfb
export QT_QPA_FONTDIR=/usr/share/fonts/truetype/ubuntu-font-family

3. updated qtchooser with qt5.10.12.conf + QT_SELECT=qt5.10.12

/usr/local/qt5.10.12-aarch64/bin
/usr/local/qt5.10.12-aarch64/lib

4. when i tried to compile a simple application got error :

qmake: could not exec '/usr/local/qt5.10.12-aarch64/bin/qmake: Exec format error 

while checking the file type of qmake :

file qmake 
qmake: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=17bacfee99d8cc5fd002c3de3213ce987e40dd3b, not stripped

Could any one please suggest what's wrong with the ./configure steps ?
Thanks in Adv.

[SGaist]

Hi and welcome to devnet,

Nothing is wrong. This is a cross-compiled Qt version that you can use on your desktop machine to build application for your target. qmake is a host tool not a target tool.

[guruhb]

@SGaist said in qt 5.10.12 cross compile for rk3399 (aarch64-linux-gnu-gcc) qmake "Exec format error":

Hi and welcome to devnet,

Nothing is wrong. This is a cross-compiled Qt version that you can use on your desktop machine to build application for your target. qmake is a host tool not a target tool.

Thank you, What 's the extra step or configure value required for me to generate Qt Build for arm 64 (i.e aarch64) from x86_64 machine ?

[SGaist]

That's the thing: there's no extra step. The host tools are meant to be compiled for the machine that will do the cross-compilation.

What is your exact goal ?

[guruhb]

Thanks a lot @SGaist, I have a development board which is running debian 9 build and it contains qt 5.7.1 (fetched from distro). I am trying to compile qt 5.12.10 or (any latest qt 5.9.x and above) for aarch64 (target board) so that i can use (install) on the rk3399 development board.

target : aarch64 (rk3399 arm development board)
host : laptop running ubuntu 20.xx (x86_64)

1. Build Qt 5.9.x (or any latest so that i can develop UI on my Linux desktop with qt creator and deploy the application to the development target i.e rk3399) for target from my laptop (x86_64).
2. Install the (1) on the target .
3. Create a cross compilable Qt 5.9.x build (As you have pointed out and which i do have the build , which i can use for cross compile for target using my laptop).
4. Using qtcreator + (3) run UI application from host to target.

[SGaist]

So you have the exact tools you wanted. There's no need to install the host tools on your target. You won't be compiling natively on it.