Re: [platform-ui-dev] Cross platform build

[Lars Vogel <lars.vogel@xxxxxxxxxxx>]

Hi Dirk,

for your build issue, I think you are running into
https://bugs.eclipse.org/bugs/show_bug.cgi?id=491951. See Bug
discussion for the details.

For the databinding dependencies, please open a bug report, would be
nice to have them remove, if it is also for a Realm.

I plan to apply the icu change to our Eclipse 4 RCP template in PDE.
See https://bugs.eclipse.org/bugs/show_bug.cgi?id=510216

Best regards, Lars

On Mon, Jan 9, 2017 at 11:53 AM, Dirk Fauth <dirk.fauth@xxxxxxxxx> wrote:
> Hi all,
>
>
>
> I am trying to set-up a cross-platform Tycho build with a minimalistic set
> of bundles. The goal is to build the new NatTable E4 Examples application
> with the least necessary bundles to keep the size of the archive files as
> small as possible.
>
>
>
> The org.eclipse.e4.rcp feature is too big, so I am trying to create a custom
> E4 RCP feature with only the necessary parts.
>
>
>
> To elaborate what I think what can be replaced, or at least what was done in
> the old E3 world:
>
> -       Remove com.ibm.icu and replace it with com.ibm.icu.base
> This saves about 10MB. Sure this sounds not much today. But to reduce the
> download size and the necessary space on the download servers this is quite
> useful. BTW, this could be also useful in general for IoT use cases, but of
> course nothing related to the current task.
> I also noticed and fixed a bundle dependency issue in Platform UI that makes
> this change almost impossible (well if you don’t remove the dependent bundle
> o.e.e4.ui.dialogs, which is also not needed in a minimalistic feature)
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=509918
>
> -       Remove the console bundles
>
> -       Remove the databinding bundles. Unfortunately this seems to be not
> possible with E4, as Platform UI depends on databinding, at least in the
> bundle o.e.e4.ui.workbench.swt. And there the dependency is introduced to
> make use of org.eclipse.core.databinding.observable.Realm. I personally
> think such a dependency is not good, as this now means the SWT renderer is
> dependent on databinding. But I have to admit that I don’t know what Realm
> is. And it seems to be used for a long time there, so it seems nobody else
> has an issue with this, therefore I don’t want to start a discussion here.
>
>
>
> I created a custom feature similar to org.eclipse.e4.rcp and
> replaced/removed what I wanted or at least what was possible.
>
> I then modified the NatTable target platform according to
> https://wiki.eclipse.org/A_Brief_Overview_of_Building_at_Eclipse#Preferred_way_of_doing_multi-platform_builds
>
> The first thing I noticed was that "Eclipse RCP Target Components" does not
> exist anymore in Neon. Is this intended?
>
>
>
> But when I try to run the Tycho build now, I get the following error message
> at the very beginning when the target platform is resolved:
>
>
>
> [ERROR] Cannot resolve target definition:
>
> [ERROR]   Problems resolving provisioning plan.:
>
> [ERROR]      Unable to satisfy dependency from org.eclipse.swt
> 3.105.2.v20161122-0613 to org.eclipse.swt.gtk.linux.aarch64
> [3.105.2.v20161122-0613].
>
> [ERROR]      Unable to satisfy dependency from org.eclipse.swt
> 3.105.2.v20161122-0613 to org.eclipse.swt.gtk.linux.arm
> [3.105.2.v20161122-0613].
>
>
>
> I am not very familiar with the SWT dependency structure or the p2 stuff
> related to it. But a) it looks strange that there is a dependency from the
> host bundle to the fragments, and b) that there are fragments listed that
> doesn’t seem to exist. Never heard of SWT for aarch64 or arm and these
> fragments are also not included in the org.eclipse.e4.rcp feature.
>
> Did anyone had this issue before (I have seen one entry in Google for some
> RedHat build log)?
>
> Is there anything else to consider for a custom multi-platform build?
>
>
> Greez,
>
> Dirk
>
>
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-- 
Eclipse Platform UI and e4 project co-lead
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