Building OpenJFX using the OpenJDK build system

[Johan Vos]

Hi,

As part of my efforts to build OpenJFX using the OpenJDK build system, I
created a script that exactly does this. The script is used in the Github
Action in the repository https://github.com/openjdk-mobile/openjfx-build .
For questions about why this is done in the openjdk-mobile organisation on
github, see below.

The steps that are executed in the GhA are described in the README.md at
https://github.com/openjdk-mobile/openjfx-build .
Basically, this boils down to
1. clone latest openjdk (or openjdk/mobile)
2. clone latest openjfx
3. apply a small patch to the openjdk repository (so that it can deal with
--with-openjfx-modules)
4. run the gradle tasks to generate shaderclasses (to be removed)
5. configure and make the openjdk image.

We do have GhA scripts that can do the build on-demand, and they can be
modified to create daily/weekly/... builds. We do not recommend to use
these scripts for production. At least with Gluon, we do builds from a
Jenkins system where we have full control over the environment. This allows
us to use e.g. an ubuntu 24.04 system and deliver binaries that are working
on ubuntu 20.04, for example.
The value of the Github Actions, imho, is to easily detect an issue with
new code in either of the repositories.

An important thing is that this is using the very latest openjdk and
openjfx code. As I said before: it is not hard to create builds of OpenJFX
using the OpenJDK for a very specific version, using (very specific)
patches. The hard thing is to do this without requiring a huge maintenance
effort.

There are many todo's left, including:
* make it work on windows, ios and android
* include media and webkit
* generate shaders using the OpenJDK code-generate approach

This is an open effort, so everyone is welcome to contribute. But also, if
others want to use a different approach, I'm all fine with that.

- Johan

Q: Why is this in a repository that is part of the openjdk-mobile
initiative?
A: JavaFX is an optional, but crucial part when running Java applications
on mobile. Since on mobile, it is even more critical to use the correct
compilers/tools/settings/flags than it is on desktop, it is really
beneficial to use a single build system for all components that have native
code. Hence, while building OpenJFX using the OpenJDK build system is very
useful for desktop platforms, it is almost a requirement when building for
mobile platforms.
Note that currently, we only have scripts to build OpenJFX on OpenJDK for
linux and mac (hence not yet for mobile).
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