Sync Bundler PR #3624 with HEAD commits

1 files changed, 16 insertions, 4 deletions

diff --git a/lib/bundler/stub_specification.rb b/lib/bundler/stub_specification.rb
index d45f80a80a..c87b66ee19 100644
--- a/lib/bundler/stub_specification.rb
+++ b/lib/bundler/stub_specification.rb
@@ -28,9 +28,13 @@ module Bundler
 
     # @!group Stub Delegates
 
-    # This is defined directly to avoid having to load every installed spec
+    # This is defined directly to avoid having to loading the full spec
     def missing_extensions?
-      stub.missing_extensions?
+      return false if default_gem?
+      return false if extensions.empty?
+      return false if File.exist? gem_build_complete_path
+
+      true
     end
 
     def activated
@@ -41,8 +45,16 @@ module Bundler
       stub.instance_variable_set(:@activated, activated)
     end
 
-    def default_gem
-      stub.default_gem
+    def extensions
+      stub.extensions
+    end
+
+    def gem_build_complete_path
+      File.join(extension_dir, "gem.build_complete")
+    end
+
+    def default_gem?
+      stub.default_gem?
     end
 
     def full_gem_path