I tested <https://git.eclipse.org/r/#/c/155754/> Eclipse CDT with the 
staged tycho.
It worked, if I upgraded tycho version, but left .mvn/extensions.xml 
referencing 1.5.1. I don't know if this is an artifact of the build not 
being published, or an issues with pomless builds.
This is what I get with 1.6.0 (patch 
<https://git.eclipse.org/r/#/c/155754/2>, full build log 
<https://ci.eclipse.org/cdt/job/cdt-verify-test-cdt-other-pipeline/1106/console>):
[2020-01-13T15:17:04.999Z] + /usr/share/maven/bin/mvn clean verify -B -V -P skip-tests-except-cdt-other -DskipDoc=true -Ddsf.gdb.tests.timeout.multiplier=50 -Dindexer.timeout=300 -Dmaven.repo.local=/home/jenkins/.m2/repository --settings /home/jenkins/.m2/settings.xml
[2020-01-13T15:17:05.000Z] Apache Maven 3.6.0 (97c98ec64a1fdfee7767ce5ffb20918da4f719f3; 2018-10-24T18:41:47Z)
[2020-01-13T15:17:05.000Z] Maven home: /usr/share/maven
[2020-01-13T15:17:05.000Z] Java version: 1.8.0_222, vendor: Private Build, runtime: /usr/lib/jvm/java-8-openjdk-amd64/jre
[2020-01-13T15:17:05.000Z] Default locale: en_US, platform encoding: UTF-8
[2020-01-13T15:17:05.000Z] OS name: "linux", version: "3.10.0-957.1.3.el7.x86_64", arch: "amd64", family: "unix"
[2020-01-13T15:17:07.401Z] [INFO] Downloading from eclipse.maven.central.mirror:https://repo.eclipse.org/content/repositories/maven_central/org/eclipse/tycho/extras/tycho-pomless/1.6.0/tycho-pomless-1.6.0.pom 
[2020-01-13T15:17:13.396Z  <https://repo.eclipse.org/content/repositories/maven_central/org/eclipse/tycho/extras/tycho-pomless/1.6.0/tycho-pomless-1.6.0.pom
[2020-01-13T15:17:13.396Z>] [WARNING] The POM for org.eclipse.tycho.extras:tycho-pomless:jar:1.6.0 is missing, no dependency information available
[2020-01-13T15:17:13.396Z] [INFO] Downloading from eclipse.maven.central.mirror:https://repo.eclipse.org/content/repositories/maven_central/org/eclipse/tycho/extras/tycho-pomless/1.6.0/tycho-pomless-1.6.0.jar 
[2020-01-13T15:17:13.396Z  <https://repo.eclipse.org/content/repositories/maven_central/org/eclipse/tycho/extras/tycho-pomless/1.6.0/tycho-pomless-1.6.0.jar
[2020-01-13T15:17:13.396Z>] [WARNING] Failed to read extensions descriptor /home/jenkins/agent/workspace/cdt-verify-test-cdt-other-pipeline/.mvn/extensions.xml: Plugin org.eclipse.tycho.extras:tycho-pomless:1.6.0 or one of its dependencies could not be resolved: Could not find artifact org.eclipse.tycho.extras:tycho-pomless:jar:1.6.0 in eclipse.maven.central.mirror (https://repo.eclipse.org/content/repositories/maven_central/)
[2020-01-13T15:17:13.396Z] [INFO] Scanning for projects...
[2020-01-13T15:17:14.335Z] [INFO] Downloading from cbi:https://repo.eclipse.org/content/repositories/cbi-releases/org/eclipse/tycho/tycho-maven-plugin/1.6.0/tycho-maven-plugin-1.6.0.pom 
[2020-01-13T15:17:14.335Z  <https://repo.eclipse.org/content/repositories/cbi-releases/org/eclipse/tycho/tycho-maven-plugin/1.6.0/tycho-maven-plugin-1.6.0.pom
[2020-01-13T15:17:14.335Z>] [INFO] Downloading from tycho-staged:https://oss.sonatype.org/content/repositories/orgeclipsetycho-1059/org/eclipse/tycho/tycho-maven-plugin/1.6.0/tycho-maven-plugin-1.6.0.pom
[... more downloadings... ]
[2020-01-13T15:17:39.079Z] [ERROR] [ERROR] Some problems were encountered while processing the POMs:
[2020-01-13T15:17:39.079Z] [ERROR] Child module /home/jenkins/agent/workspace/cdt-verify-test-cdt-other-pipeline/build/org.eclipse.cdt.build.gcc.core/pom.xml of /home/jenkins/agent/workspace/cdt-verify-test-cdt-other-pipeline/pom.xml does not exist @
The INFO / WARNING indicates that this is a problem of config on my part 
as it is trying to download from repo.eclipse.org 
<http://repo.eclipse.org> for the tycho-pomless.
Therefore this is probably good to go, but perhaps someone knows how to 
test pomless with staged tycho?
Thanks
Jonah
~~~
Jonah Graham
Kichwa Coders
www.kichwacoders.com <http://www.kichwacoders.com>
On Mon, 13 Jan 2020 at 07:06, Mickael Istria <mistria@xxxxxxxxxx 
<mailto:mistria@xxxxxxxxxx>> wrote:
    Hi,
    Tycho release 1.6.0 has been staged. For details of new features and bugfixes, see release notes [1].
    Please help by testing the staged build. To use it, change your tycho version to 1.6.0 and add snippet [2] to your pom.
    We plan to promote this release in one week unless major regressions are found.
    Regards,
    Tycho team
    [1]http://wiki.eclipse.org/Tycho/Release_Notes/1.6
    [2]
       <pluginRepositories>
         <pluginRepository>
           <id>tycho-staged</id>
           <url>https://oss.sonatype.org/content/repositories/orgeclipsetycho-1059</url>
         </pluginRepository>
       </pluginRepositories>
    -- 
    Mickael Istria
    Eclipse IDE <https://www.eclipse.org/downloads/eclipse-packages/>
    developer, for Red Hat Developers <https://developers.redhat.com/>
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