Set opts["platform"] to the mutated platforms in the normalization me…

…thod, not the original value

lib/bundler/dsl.rb

@@ -226,7 +226,7 @@ def _normalize_options(name, version, opts)
 
       opts["source"]  ||= @source
       opts["env"]     ||= @env
-      opts["platforms"] = @platforms.dup
+      opts["platforms"] = platforms.dup
       opts["group"]     = groups
     end
 

spec/install/gems/platform_spec.rb

@@ -94,7 +94,7 @@
       gem "rack", "1.0.0"
     G
 
-    bundle "install ./vendor"
+    bundle "install --path vendor"
 
     vendored_gems("gems/rack-1.0.0").should exist
   end
@@ -106,7 +106,7 @@
       gem "rack", "1.0.0"
     G
 
-    bundle "install ./vendor"
+    bundle "install --path vendor"
 
     new_version = Gem::ConfigMap[:ruby_version] == "1.8" ? "1.9.1" : "1.8"
     FileUtils.mv(vendored_gems, bundled_app("vendor/#{Gem.ruby_engine}/#{new_version}"))
@@ -130,6 +130,21 @@
     should_be_installed "nokogiri 1.4.2"
   end
 
+  it "does not install gems tagged w/ another platform" do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+
+      gem "rack"
+
+      platforms :#{not_local_tag} do
+        gem "nokogiri"
+      end
+    G
+
+    should_be_installed     "rack 1.0"
+    should_not_be_installed "nokogiri 1.4.2"
+  end
+
   it "installs gems tagged w/ the current platform" do
     install_gemfile <<-G
       source "file://#{gem_repo1}"
@@ -151,4 +166,16 @@
 
     should_not_be_installed "nokogiri"
   end
+
+  it "does not install gems tagged w/ another platform" do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+
+      gem "rack"
+      gem "nokogiri", :platforms => :#{not_local_tag}
+    G
+
+    should_be_installed     "rack 1.0"
+    should_not_be_installed "nokogiri 1.4.2"
+  end
 end