build: fix Eclipse project generation instructions

BuildShip and Gradle :eclipse are incompatible:
https://github.com/eclipse/buildship/issues/267#issuecomment-547318667

Therefore, we run :eclipseJdt manually instead to genrate the JDT
configuration to ignore @SuppressWarning unknown warnings, which lets us
silence Sonar warnings in-line.

We also run :generateXtext to make sure all generated sources are ready
for the Eclipse build.

1 files changed, 4 insertions, 1 deletions

diff --git a/build.gradle b/build.gradle
index 8f787889..3591c286 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ allprojects {
         version = '0.0.0-SNAPSHOT'
 
         sonarqube.properties {
-                // Make sure 'exclusions' is a List in every subproject
+                // Make sure `exclusions` is a List in every subproject
                 property 'sonar.exclusions', []
         }
 }
@@ -20,3 +20,6 @@ sonarqube.properties {
         property 'sonar.organization', 'graphs4value'
         property 'sonar.host.url', 'https://sonarcloud.io'
 }
+
+apply plugin: 'eclipse'
+