How to cross compile qt code from x64 linux to linux ARM

[qjqj]

Hi,

I am trying to cross compile my qt code to be deploy in linux ARM machine.

I have searched online how to cross compile but I am not sure at one step which is load the qmake of the arm qt. When I load that it prompt "Exec format error". I have added gcc and g++ compiler for ARM inside qt and I am left with the qmake step which I am confuse about.

Does anyone know?

Thanks!

[koahnig]

@qjqj

Do you have already a cross-compile toolchain for ARM installed?
Do you have Qt library source cross-compiled?

[Pablo J. Rogina]

@qjqj this guide may help you regarding cross-compiling ARM on Linux...

[qjqj]

@koahnig I have the tool chain for the arm. Do I also need to download the cross compile for arm qt?

[qjqj]

@koahnig Do you mean the qt library in qt linux arm? If so I have also.

[koahnig]

@qjqj said in How to cross compile qt code from x64 linux to linux ARM:

@koahnig I have the tool chain for the arm. Do I also need to download the cross compile for arm qt?

@qjqj said in How to cross compile qt code from x64 linux to linux ARM:

@koahnig Do you mean the qt library in qt linux arm? If so I have also.

You need to have a specific cross-compiler for your ARM device installed on the desktop computer you like to use for cross-compiling. As a general rule with this cross-compiler you need to cross-compile all source including all libraries. Note some cross-compiled libs might be already provided already where you can download the cross-compiler.

Therefore you need to install a specific cross-compiler for your ARM device. You need also in most cases to cross-compile qt libraries including its tools with your cross-compiler on your desktop. The important part after successful cross-compilation is the freshly generated qmake, which holds all information of your cross-compile toolchain. You need to make sure that this is used by Qt creator.
Note: Sometimes you can also find pre-cross-compiled Qt libs for some ARM or other embedded devices. However, they are mostly outdated versions, but may work better for tricky devices.

See also the guide mentioned in here:
@pablo-j-rogina said in How to cross compile qt code from x64 linux to linux ARM:

@qjqj this guide may help you regarding cross-compiling ARM on Linux...

There are other similar guides around.

[qjqj]

@pablo-j-rogina

Thanks for the guide! It was helpful