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Cross-Compilation Build System for Qt 6 on the Full Raspberry Pi Family
How I turned a 20-hour, failure-prone build process into a repeatable, resumable workflow that runs on an 8 GB Ubuntu host
The Problem: A Build That Consumes Your Life
If you’ve ever tried to cross-compile Qt 6 for a Raspberry Pi, you know the pain. The typical journey looks like this:
You start with good intentions. You install the Qt source, configure the cross-compilation toolchain, and kick off the build. Twenty hours later, at 90% completion, the build fails because of a CMake version conflict. You fix it, start over, and four hours in you hit a missing system library. You fix that, start over, and nineteen hours in, the linker gets OOM-killed because QtWebEngine’s final link step needs more RAM than your machine has.
Each iteration adds another 10 hours. Each failure point is discovered only after hours of compilation work is lost. The process installs system-wide packages and libraries you’ll never use for anything else, polluting your host. And if you want to build for more than one Raspberry Pi model, you multiply the pain by twelve.
