在 Ubuntu 18.04 上编译 Qt 程序，它将在 Ubuntu 14.04 上运行

Question

Interesting delema.

Trying to compile Qt program where Qt is build from source on 18.04 64-bit and run it on 14.04. The interesting part is trying to identify which libraries I need this time. The C++ ABI has changed.

Looking to see if anyone else has done this recently? Which libraries do I have to bring along? Yes, I know about ldd and readelf and have spent days trying this in various VMs. The problem is once you start bringing the C++ stuff over (because the ABI has changed yet again) you get to a point where your VM won't reboot.

Please don't suggest snappy, flatpak or one of those other new "container" solutions. Already wasted 3+ days on snappy. It's architecture specific and only supports building on 14.04 when it comes to Qt, at least the deployqt tool to make an AppImage does.

Did this years ago with this very program. Built a debian which would install on both 64-bit and 32-bit for every version from 12.04 to 15.04 including the short lived .10 and odd year versions.

I tried compiling QT with C++11 standard, but, it will no longer compile with that standard.

The incompatible ABI is the real killer.

It is more than one program so the hack of a shell script using LD_LIBRARY_PATH would bring considerable difficulty.

Appreciate insights.

Thank you.

Answer 1

Please always develop applications on the oldest distribution you still want your application to run on. For example, if you want your application to run on all currently still-supported versions of Ubuntu, then develop your application on Ubuntu 14.04 and do not install any newer compilers or libraries than what it comes with.

This is how "backward compatibility" works.