Re: [tycho-user] What packaging to use for a myapp.target project?

[Mickael Istria <mistria@xxxxxxxxxx>]

On 05/22/2014 10:18 PM, Steinar Bang wrote:

As far as I can tell from today's google searches, that won't be the
case: there can only be one target platform setting per workspace:
 Window->Preferences
then
 Plug-in Development->Target Platform

The choices in that property dialog window are the Running Platform, and
all of the projects containing .target files, but there can only be one
selected at any given time.

There is a still-open issue for making it possible to have more than one
target platform definition per workspace, that was almost fixed for
eclipse 3.8, but was dropped for lack of resources:
 https://bugs.eclipse.org/bugs/show_bug.cgi?id=159072

True, in IDE, only one target-platform per workspace.
With Tycho, target-platform is attached to each modules, so modules can have different targets. Even more, Tycho allows to reference multiple target definition (.target files) simultaneously, ending up with a kind of "merge" of their contents as the target-platform.

So if you have more than one tycho project with different target
platform requirements living in a single eclipse workspace, the simplest
way to make things build, is to ensure that you have all of the
requirements installed in the eclipse itself.

You could also think of statically creating a merged target definition/.target file, that you can then use in the IDE. We (JBoss Tools and family) have a mojo that does that: https://github.com/jbosstools/jbosstools-maven-plugins/blob/master/tycho-plugins/target-platform-utils/src/main/java/org/jboss/tools/tycho/targets/MergeTargetsMojo.java . See an example of usage at https://github.com/jbosstools/jbosstools-integration-stack/blob/master/target-platform/pom.xml#L131 .
We do use it to "stack" target definitions: JBoss Tools has a target definitions containing mostly org.eclipse stuff, JBoss Tools integration stack builds on top of JBoss Tools so it creates a target definition which consists of JBoss Tools target-platform + some additions + JBoss Tools itself. People can import this target-definition in their IDE and they everything they need.

HTH

--
Mickael Istria
Eclipse developer at JBoss, by Red Hat
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