allow customization of target/source levels for compilation. Fix for …

…GRAILS-7693 "Allow customization of bytecode level for compiler when compiling binary plugins"

grails-resources/src/grails/grails-app/conf/BuildConfig.groovy

@@ -2,6 +2,8 @@ grails.servlet.version = "2.5" // Change depending on target container complianc
 grails.project.class.dir = "target/classes"
 grails.project.test.class.dir = "target/test-classes"
 grails.project.test.reports.dir = "target/test-reports"
+grails.project.source.level = 1.6
+grails.project.target.level = 1.6
 //grails.project.war.file = "target/${appName}-${appVersion}.war"
 
 grails.project.dependency.resolution = {

grails-resources/src/grails/plugin/grails-app/conf/BuildConfig.groovy

@@ -1,6 +1,8 @@
 grails.project.class.dir = "target/classes"
 grails.project.test.class.dir = "target/test-classes"
 grails.project.test.reports.dir = "target/test-reports"
+grails.project.source.level = 1.6
+grails.project.target.level = 1.6
 //grails.project.war.file = "target/${appName}-${appVersion}.war"
 
 grails.project.dependency.resolution = {

scripts/_GrailsClasspath.groovy

@@ -34,6 +34,9 @@ includeTargets << grailsScript("_GrailsSettings")
 classpathSet = false
 includePluginJarsOnClasspath = true
 projectCompiler = new GrailsProjectCompiler(pluginSettings, classLoader)
+def compileConfigLevels = grailsSettings.config.grails.project
+projectCompiler.javaOptions.source = compileConfigLevels.source.level ?: 1.6
+projectCompiler.javaOptions.target = compileConfigLevels.target.level ?: 1.6
 projectCompiler.ant = ant
 
 target(name:'classpath', description: "Sets the Grails classpath", prehook:null, posthook:null) {