add YARD comments to get to 100% YARD coverage

lib/rscons/builders/mixins/object.rb

@@ -8,6 +8,7 @@ module Rscons
 
   module Builders
     module Mixins
+      # Mixin for builders needing to build object files.
       module Object
 
         include Depfile

lib/rscons/builders/program.rb

@@ -8,6 +8,8 @@ module Rscons
       include Mixins::Program
 
       class << self
+        # Custom new method which will delegate to the correct class depending
+        # on the options specified.
         def new(options, *more)
           unless File.basename(options[:target])["."]
             options[:target] += options[:env].expand_varref("${PROGSUFFIX}", options[:vars])

lib/rscons/builders/shared_library.rb

@@ -8,6 +8,8 @@ module Rscons
       include Mixins::Program
 
       class << self
+        # Custom new method which will delegate to the correct class depending
+        # on the options specified.
         def new(options, *more)
           libprefix = options[:env].expand_varref("${SHLIBPREFIX}", options[:vars])
           unless File.basename(options[:target]).start_with?(libprefix)

lib/rscons/builders/shared_object.rb

@@ -7,6 +7,8 @@ module Rscons
       include Mixins::Object
 
       class << self
+        # Content component to add to build path to separate objects built
+        # using this builder from others.
         def extra_path
           "_shared"
         end