Re: Add lang/openjdk21-bin?

["J. Lewis Muir" <jlmuir%imca-cat.org@localhost>]

On 03/03, Greg Troxel wrote:
> "J. Lewis Muir" <jlmuir%imca-cat.org@localhost> writes:
> 
> > OK, I was unclear again.  Sorry about that.  Yes, I mean that
> > lang/openjdk-bin just happens to be version 21, but that could change at
> > any time.  I'm wishing for a versioned package so that I can encode in
> > the dependency that version 21 is what's wanted.
> >
> > This is probably also related to me being unclear on what you
> > pointed out in your other reply, that you generally don't specify a
> > dependency on foo-bin, just foo.
> 
> I suggest reading /usr/pkgsrc/mk/java-vm.mk
 
OK, that was helpful; I see two things from that:

1. I can control which JVM is the default with PKG_JVM_DEFAULT.
2. PKG_JVM_DEFAULT can accept *-bin values.

I understand this to mean that it would work to add lang/openjdk21-bin,
add support for it in mk/java-vm.mk, in particular as a possible value
for PKG_JVM_DEFAULT, and then I could set PKG_JVM_DEFAULT=openjdk21-bin
to get the behavior I'm after.

> > But this still seems like a mismatch
> > to me in that there's openjdk<version> and openjdk-bin, but not
> > openjdk<version>-bin.  So, if openjdk<version> doesn't build for your
> > platform and pkgsrc was able to fall back to openjdk-bin because it was
> > at <version>, that will break when openjdk-bin gets switched to a newer
> > <version>.
> 
> It would then end up with not having a bin package.

Right, and that's the problem I was raising.

> The overall tone of java-vm.mk is that a newer jdk is always ok.

Unfortunately, that's not great.  It's true that Java is very good
at maintaining backward compatibility, but only to a point; things
still change.  For example, subsystems will be marked as deprecated and
eventually removed in future versions, and if you end up getting a JVM
version where whatever got removed, then software that used it and used
to work will break.  Similarly for the command line interfaces of java,
javac, javadoc, etc.  It's not that they're impossible changes to deal
with, but they will make certain things break that you then have to fix,
so that's why I like to stay on an LTS version for a good chunk of time
so that I don't have to mess with fixing stuff like that quite so often.

Lewis