[scl.org] problems with rebuilding devtoolset-4 (tycho on centos7)

[Honza Horak]

We have some issues with packages devtoolset-4-tycho and 
devtoolset-4-sqt-chart when trying to rebuild devtoolset-4 in centos.

For centos 6 it went ok, for centos7 we see build errors once we set 
%bootstrap macro to 0:

http://cbs.centos.org/koji/taskinfo?taskID=61162

I suspect the tycho being not properly build without bootstrap can cause 
also the swt-chart build error:

http://cbs.centos.org/koji/taskinfo?taskID=61178

Except many errors in tycho build log like this:

[INFO] Tycho (Incubation) ................................ FAILURE [10.901s]

...

[ERROR] public File getLocation();
[ERROR] ^
[ERROR] 
/builddir/build/BUILD/org.eclipse.tycho-tycho-0.23.0/tycho-bundles/org.eclipse.tycho.embedder.shared/src/main/java/org/eclipse/tycho/ArtifactDescriptor.java:34: 
error: unknown tag: TODO
[ERROR] * @TODO should come from separate ReactorArtifactDescriptor
[ERROR] ^
[ERROR] 
/builddir/build/BUILD/org.eclipse.tycho-tycho-0.23.0/tycho-bundles/org.eclipse.tycho.embedder.shared/src/main/java/org/eclipse/tycho/ArtifactDescriptor.java:36: 
warning: no @return

...

I see some suspicious error before:

...

[INFO] Mojo extractor for language: java-annotations found 11 mojo 
descriptors.
line 2 column 68 - Error: plugin is not recognized!

...

Not sure if this ^ one is causing the troubles though.

Full build log is available at:
http://cbs.centos.org/kojifiles/work/tasks/1164/61164/build.log

I'd be very glad for any help, because I'm already out of ideas.

Honza