Merge pull request jruby#8415 from headius/skip_default_gem_extensions

Skip extension builds for default gems

lib/pom.rb

@@ -252,6 +252,18 @@ def log(message=nil)
       File.join(global_bin, "jruby#{RbConfig::CONFIG['EXEEXT']}")
     end
 
+    # Disable extension build for gems (none of ours require a build)
+    class Gem::Ext::Builder
+      def build_extensions
+        return if @spec.extensions.empty?
+
+        say "Skipping native extensions."
+
+        FileUtils.mkdir_p File.dirname(@spec.gem_build_complete_path)
+        FileUtils.touch @spec.gem_build_complete_path
+      end
+    end
+
     ctx.project.artifacts.select do |a|
       a.group_id == 'rubygems' || a.group_id == 'org.jruby.gems'
     end.each do |a|