Allow configure to detect if EC implementation is present

[Andrew Hughes]

----- Original Message -----
> On 15/03/2013 12:55 PM, Andrew Hughes wrote:
> > ----- Original Message -----
> >> On 15/03/2013 5:37 AM, Omair Majid wrote:
> >>> Hi,
> >>>
> >>> Updated webrev at:
> >>> http://cr.openjdk.java.net/~omajid/webrevs/intree-ec/01/
> >>>
> >>> I switched from DISABLE_INTREE_EC to ENABLE_INTREE_EC to avoid
> >>> the
> >>> confusion with double negatives.
> >>
> >> Looking just at the mechanics of this it looks fine to me.
> >
> > I concur.
> >
> >> This needs to
> >> be coordinated with someone from the build team (which isn't me)
> >> so
> >> that we can keep the closed generated-configure.sh in sync.
> >
> > I don't think this is a reasonable requirement generally, though it
> > may be fine in this case.  We should now be getting to the point
> > where an OpenJDK committer can post a patch, an OpenJDK reviewer
> > can review it and the committer can push it to an appropriate
> > repository without either of these people being Oracle employees.
> > Certainly, the bylaws allow this.
> >
> > What you're asking here seems no different than me asking for
> > someone to co-ordinate with the IcedTea team to update their
> > build machinery.  I wouldn't expect this to happen and I don't
> > think
> > Oracle should either.
> 
> We know this is a problem. Hopefully we will have a solution soon
> that
> will alleviate the need for this. In the meantime I would request
> your
> forbearance. I should have said "Can you please ..." rather than
> "This
> needs ...".
> 

Thanks :-)

I'm just very wary of anything that looks like it will block people
getting involved in OpenJDK.

> >>
> >> Personally I wonder whether the existence check should be in the
> >> Makefile rather than done at configure time? I worry that we end
> >> up
> >> with too many make variables becoming configure variables as well.
> >>
> >
> > One of the main functions of a configure script is to make these
> > variables more easily accessible to the point that you should
> > only need to set make variables when you need to do a one-time
> > override
> > of something set by configure.  We should no longer be passing a
> > huge
> > list of make variables.
> 
> Totally agreed with the last point.
> 
> But to me the division of labor between configure and make is not
> always
> clear.
> 

It's often not for me either, and the problem is twofold if you have
an existing setup as with OpenJDK because you're not adding a new option
so much as deciding how to access an old one.

> David
> -----
> 
> > I'd argue that Omair's work could be extended, in a further patch,
> > so
> > that the option was set by --disable-intree-ec and the behaviour
> > seen here was just the default if the option wasn't specified.
> > Having configure options also acts as a means of documenting the
> > various build options (see configure --help), something which
> > doesn't happen when they are imposed via make.
> 
> 
> 
> >> David
> >> -----
> >>
> >>> Note that because of the ifeq comparison, if you use the new
> >>> build
> >>> system and just update the jdk tree, the ifeq
> >>> ($ENABLE_INTREE_EC),
> >>> yes)
> >>> comparison will fail (since ENABLE_INTREE_EC was not previously
> >>> defined)
> >>> and EC will not be part of the build.
> >>>
> >>> This problem wont happen if you update the root repo and re-run
> >>> configure.
> >>>
> >>> On 03/14/2013 06:03 AM, David Holmes wrote:
> >>>> On 14/03/2013 3:12 PM, David Holmes wrote:
> >>>>> Note that this isn't changing any functionality simply exposing
> >>>>> an
> >>>>> existing make variable at configure time.
> >>>>
> >>>> Correction. I misunderstood what was being done here. This
> >>>> forcibly
> >>>> set/clears the make variable based solely on the existence of a
> >>>> directory:
> >>>>
> >>>> test -d "${SRC_ROOT}/jdk/src/share/native/sun/security/ec/impl"
> >>>
> >>> Yes, it is forcibly set. But since this directory always exists
> >>> in
> >>> OpenJDK 8, this should never evaluate to false.
> >>>
> >>> This change is very useful for distributions, though, since they
> >>> can
> >>> delete the directory when creating a source tarball for OpenJDK8,
> >>> and
> >>> the ECC implementation will be automagically disabled from the
> >>> build.
> >>>
> >>>> It doesn't expose a configure option for this. This may be
> >>>> perfectly
> >>>> fine but the person who wrote the original TODO comment needs to
> >>>> verify
> >>>> that.
> >>>
> >>> Andrew Hughes wrote the original changeset in the old build
> >>> system
> >>> [1]
> >>> and I believe this is exactly what he wanted out of the
> >>> changeset.
> >>> I am
> >>> CC'ing Erik, who wrote the TODO [2] so he can clarify what he
> >>> meant.
> >>>
> >>> Thanks,
> >>> Omair
> >>>
> >>> [1] http://hg.openjdk.java.net/jdk7/tl/jdk/rev/39c15c0a71f7
> >>> [2]
> >>> http://hg.openjdk.java.net/build-infra/jdk8/jdk/diff/1953cf522107/makefiles/CompileNativeLibraries.gmk
> >>>
> >>
> >
> 

-- 
Andrew :)

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

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