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currently I am trying to cross compile a stand-alone Opc Ua Server on a Raspberry Pi4B with Qt 5.15.2 and the Qt Opc Ua Plugin. For Cross Compilation, I used this instruction: https://wapel.de/?p=842. My source code is based on the official waterpump example: https://doc.qt.io/QtOPCUA/qtopcua-waterpump-waterpump-qmlcpp-example.html

My exact problem is: The Relaese-Version of the Server does not deploy on the Raspberry Pi correctly.

After building the software, I get following error code within the error log window

/tmp/ccF0J1PW.s:-1: Error: Assembler messages:

The compiler log window shows this error description:

/tmp/ccF0J1PW.s: Assembler messages:
/tmp/ccF0J1PW.s:4206: IT blocks containing 32-bit Thumb instructions are deprecated in ARMv8
/tmp/ccF0J1PW.s:13562: IT blocks containing 32-bit Thumb instructions are deprecated in ARMv8
/tmp/ccF0J1PW.s:71648: IT blocks containing 32-bit Thumb instructions are deprecated in ARMv8

After running the Application with the error, I got the following Output in the Application Window:

Could not initialize server.
double free or corruption (fasttop)

My Qt-Development-Kit for Cross Compiling is using the following Compiler-Combination:

  • C++ Compiler: gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf-g++
  • C Compiler: gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf-gcc

Is there anyone who had the same problem? I would be glad to get any tips, how to solve this.

By the way: I posted the same thread within the Qt and ARM Forum, but I didn`t got an answer ;)

Thank you in Advance!

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  • Suggest that you compile Qt on the Pi4b. It has enough horsepower to do so, and then anything you write for the Pi can be compiled directly on the Pi.
    – guitarpicva
    Feb 19, 2021 at 14:06
  • Dear guitarpicva, thank you for your tip. I will try this out an let you know if I was succesful.
    – Mauda
    Feb 20, 2021 at 7:59
  • I've even done this on an RPi3B+, but that is a painful process. the RPi4 with it's better CPU and more RAM makes it doable. Start with at least a 32 GB SD card, or larger, otherwise you may risk filling the file system on the SD card.
    – guitarpicva
    Feb 20, 2021 at 13:16

1 Answer 1

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First, compile Qt on the RPi 4.
Then install the build-essential package and you will be able to compile any relevant Qt source code on the RPi directly at the command line.

Using a shadow build process:

Ensure that the path to the qmake executable is on your path.

/home/me/src/MyProg/ contains your source files and .pro file for the project.

/home/me/build/MyProg/ is the shadow build area.

cd /home/me/build/MyProg and run the qmake and make steps as:

qmake ../../src/MyProg/MyProg.pro && make

If qmake and make are both successful, your executable will be in the build folder /home/me/build/MyProg/

SIGNIFICANT UPDATE: RPi OS Bullseye now hat Qt5.15.2 libraries in the package system!

So the answer transforms to "Install Qt5 base libraries" instead of "First, compile Qt on the RPi 4."

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