1 files changed, 21 insertions, 15 deletions
diff --git a/lib/rubygems/basic_specification.rb b/lib/rubygems/basic_specification.rb
index 204231e95e..0ed7fc60bb 100644
--- a/lib/rubygems/basic_specification.rb
+++ b/lib/rubygems/basic_specification.rb
@@ -34,15 +34,6 @@ class Gem::BasicSpecification
     internal_init
   end
 
-  def self.default_specifications_dir
-    Gem.default_specifications_dir
-  end
-
-  class << self
-    extend Gem::Deprecate
-    rubygems_deprecate :default_specifications_dir, "Gem.default_specifications_dir"
-  end
-
   ##
   # The path to the gem.build_complete file within the extension install
   # directory.
@@ -71,11 +62,7 @@ class Gem::BasicSpecification
   # Return true if this spec can require +file+.
 
   def contains_requirable_file?(file)
-    if @ignored
-      return false
-    elsif missing_extensions?
-      @ignored = true
-
+    if ignored?
       if platform == Gem::Platform::RUBY || Gem::Platform.local === platform
         warn "Ignoring #{full_name} because its extensions are not built. " \
              "Try: gem pristine #{name} --version #{version}"
@@ -93,8 +80,17 @@ class Gem::BasicSpecification
     end
   end
 
+  ##
+  # Return true if this spec should be ignored because it's missing extensions.
+
+  def ignored?
+    return @ignored unless @ignored.nil?
+
+    @ignored = missing_extensions?
+  end
+
   def default_gem?
-    loaded_from &&
+    !loaded_from.nil? &&
       File.dirname(loaded_from) == Gem.default_specifications_dir
   end
 
@@ -194,6 +190,9 @@ class Gem::BasicSpecification
     File.expand_path(File.join(gems_dir, full_name, "data", name))
   end
 
+  extend Gem::Deprecate
+  rubygems_deprecate :datadir, :none, "4.1"
+
   ##
   # Full path of the target library file.
   # If the file is not in this gem, return nil.
@@ -251,6 +250,13 @@ class Gem::BasicSpecification
     raise NotImplementedError
   end
 
+  def installable_on_platform?(target_platform) # :nodoc:
+    return true if [Gem::Platform::RUBY, nil, target_platform].include?(platform)
+    return true if Gem::Platform.new(platform) === target_platform
+
+    false
+  end
+
   def raw_require_paths # :nodoc:
     raise NotImplementedError
   end