Suppress error warning in HotSpot backports

[Andrew Hughes]

----- Original Message -----
> On 03/18/2014 03:00 PM, Volker Simonis wrote:
> > The warning is OK, just the wording is misleading.
> > 
> > The '-XX:MaxPermSize' option is a VM (i.e. HotSpot option) so it only
> > depends on the actual HS version and not on the JDK version.
> > 
> > After Oracle decided to not follow the express model any more (i.e.
> > downport new HS versions to old Java releases) for them "8.0" is
> > equivalent to "HS 25".
> > 
> > So you could change the wording to say something like "..was removed
> > in this version of HotSpot". But if you run a HS 25 in Java 7 the
> > warning is definitely reasonable and useful because the
> > '-XX:MaxPermSize' option will be simply ignored (because the PermGen
> > is gone).
> 
> Is that ever something other than noise, though?  What use is that
> message to a user?
> 
> > So do you plan do release a version of OpenJDK 7 with HS25?
> 
> We sure do.  There's no way that we're back-porting AArch64 to
> HS24.
> 
> > I think we want to do the same for our commercial SAP JVM, although
> > I'm pretty sure this will require some considerable tweaking. And
> > Oracle will be probably reluctant to integrate such changes into
> > HS25, because they don't want to downport it to Java 7 as far as I
> > know. Not to speak about the fact that you'll have to maintain your
> > own 7u-forest
> 
> That's OK.  We can do that.
> 

Well, we already have it for AArch64 and we've been maintaining one in
the form of IcedTea since 2008. Our hope had been to eventually get rid
of such things though... :(

> > because the official one will probably never contain a HS25.
> 
> Well, that depends.  If some evil security bug comes along that
> requires a chunk 'o rewriting, Oracle may find the motivation.
> But this piece of code just seems wrong to me: it's not that
> unusual to back-port HotSpot releases.

This is annoying already because I'd hoped that we'd be able to merge
the AArch64 port into the IcedTea forest once 7u moved to hs25, simplifying
things a lot.

http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1710 also suggests
we're going to need hs25 unless a better option appears.

> 
> Andrew.
> 

-- 
Andrew :)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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