Merge pull request #5230 from dearblue/mruby-config.2

Ignore `mruby-bin-config` in cross-building

lib/mruby/build.rb

@@ -116,9 +116,10 @@ module MRuby
         @toolchains = []
         @gem_dir_to_repo_url = {}
 
-        MRuby.targets[@name] = self.class.current = current = self
+        MRuby.targets[@name] = current = self
       end
 
+      MRuby::Build.current = current
       current.instance_eval(&block)
       current.build_mrbc_exec if current.libmruby_enabled? && @name == "host"
       current.build_mrbtest if current.test_enabled?

mrbgems/mruby-bin-config/mrbgem.rake

-unless MRuby::Build.current.kind_of?(MRuby::CrossBuild)
+if MRuby::Build.current.kind_of?(MRuby::CrossBuild)
+  gemname = File.basename File.dirname __FILE__
+  buildname = MRuby::Build.current.name
+  $stderr.puts "WARN  #{gemname} - This mrbgem is ignored within #{buildname}"
+else
   MRuby::Gem::Specification.new('mruby-bin-config') do |spec|
     name = 'mruby-config'
     spec.license = 'MIT'