I wanted to update the 2 wiki Eclipse pages regarding Gradle. But so far got some issues in my environment (still Windows 7).
I use both Eclipse Luna and Mars (Mars at 98%). Luna does not support Gradle.
First I must say my Mars instance works perfectly, but for few months I'm unable to update. I did not try yet to create another Mars instance because I guess it will anyway screws its update mechanism later :/
Mars comes with the embedded "Gradle Buildship" plugin, I have the 1.0.5 version from 2015-09-22. I found this tuto http://www.vogella.com/tutorials/EclipseGradle/article.html (with a 6/7 clone/redundant section).
Few remarks: I see no Gradle context menu entrie, maybe due to my unability to update Mars, so I'm unable to "add Gradle support to existing Eclipse project ". So I created a Gradle "trunk" side project following , but, though all work well in command line, in Eclipse building with Gradle does not work. I always get (see compile.error)
Of course I tried (4th) to install Eclipse Neon, to no avail, so far the best I got (at least I eventually got something) is in neon.error
I'll continue later...