RFR: 8290473: update Eclipse .classpath in apps, buildSrc [v6]

[Nir Lisker]

On Tue, 9 Aug 2022 15:11:49 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> This is up to Kevin. It's changing the build file specifically to remove a warning for Eclipse Mac users. I don't mind. Might need to do the same for the other OS-specific folders.
>
> While not ideal, I suppose it's OK. I'm still amazed that Eclipse doesn't have the notion of optional source paths. How do people deal with this when debugging the JDK? Many modules (`java.base` and `java.desktop`, just to name two) have entire directories of platform-specific sources.
> 
> I will review the changes to `build.gradle`.

It does have optional source paths, this is what I showed above:

<classpathentry kind="src" path="build/hlsl/Prism">
	<attributes>
		<attribute name="ignore_optional_problems" value="true"/>
	</attributes>
</classpathentry>

I never had any issue with optional sources. According to Andy, it's only on Mac that Eclipse generates a warning (though not an error?), on Win and Linux there is no issue.

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PR: https://git.openjdk.org/jfx/pull/858