[bundler/bundler] Revert "Add all platforms to lockfile by default"

This reverts commit 3dc509e645abb497e4dc92a7c42be471ff87db0b.

https://github.com/bundler/bundler/commit/b5766564fb

lib/bundler/cli/outdated.rb

@@ -169,8 +169,6 @@ module Bundler
     end
 
     def retrieve_active_spec(definition, current_spec)
-      return unless current_spec.match_platform(Bundler.local_platform)
-
       if strict
         active_spec = definition.find_resolved_spec(current_spec)
       else

lib/bundler/definition.rb

@@ -113,7 +113,7 @@ module Bundler
       end
       @unlocking ||= @unlock[:ruby] ||= (!@locked_ruby_version ^ !@ruby_version)
 
-      add_platforms unless Bundler.frozen_bundle?
+      add_current_platform unless Bundler.frozen_bundle?
 
       converge_path_sources_to_gemspec_sources
       @path_changes = converge_paths
@@ -543,12 +543,6 @@ module Bundler
 
   private
 
-    def add_platforms
-      (@dependencies.flat_map(&:expanded_platforms) + current_platforms).uniq.each do |platform|
-        add_platform(platform)
-      end
-    end
-
     def current_platforms
       current_platform = Bundler.local_platform
       [].tap do |platforms|

spec/bundler/install/gemfile/platform_spec.rb

@@ -372,7 +372,7 @@ RSpec.describe "bundle install with platform conditionals" do
     expect(out).not_to match(/Could not find gem 'some_gem/)
   end
 
-  it "resolves all platforms by default and without warning messages" do
+  it "prints a helpful warning when a dependency is unused on any platform" do
     simulate_platform "ruby"
     simulate_ruby_engine "ruby"
 
@@ -384,27 +384,9 @@ RSpec.describe "bundle install with platform conditionals" do
 
     bundle! "install"
 
-    expect(err).to be_empty
-
-    lockfile_should_be <<-L
-      GEM
-        remote: #{file_uri_for(gem_repo1)}/
-        specs:
-          rack (1.0.0)
-
-      PLATFORMS
-        java
-        ruby
-        x64-mingw32
-        x86-mingw32
-        x86-mswin32
-
-      DEPENDENCIES
-        rack
-
-      BUNDLED WITH
-         #{Bundler::VERSION}
-    L
+    expect(err).to include <<-O.strip
+The dependency #{Gem::Dependency.new("rack", ">= 0")} will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
+    O
   end
 
   context "when disable_platform_warnings is true" do

spec/bundler/runtime/require_spec.rb

@@ -425,7 +425,7 @@ RSpec.describe "Bundler.require with platform specific dependencies" do
       source "#{file_uri_for(gem_repo1)}"
 
       platforms :#{not_local_tag} do
-        gem "platform_specific", :require => "omgomg"
+        gem "fail", :require => "omgomg"
       end
 
       gem "rack", "1.0.0"