From a2653a77d1a85e3174cb33e6eafd46bdda6bbf6e Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 15 Apr 2014 14:04:59 -0400
Subject: [PATCH] shortcut Environment#process if @targets is empty

---
 lib/rscons/environment.rb | 40 ++++++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/lib/rscons/environment.rb b/lib/rscons/environment.rb
index 4cdebd7..24a6a0e 100644
--- a/lib/rscons/environment.rb
+++ b/lib/rscons/environment.rb
@@ -175,29 +175,31 @@ module Rscons
       cache = Cache.instance
       cache.clear_checksum_cache!
       targets_processed = {}
-      process_target = proc do |target|
-        targets_processed[target] ||= begin
-          @targets[target][:sources].each do |src|
-            if @targets.include?(src) and not targets_processed.include?(src)
-              process_target.call(src)
+      unless @targets.empty?
+        process_target = proc do |target|
+          targets_processed[target] ||= begin
+            @targets[target][:sources].each do |src|
+              if @targets.include?(src) and not targets_processed.include?(src)
+                process_target.call(src)
+              end
             end
+            result = run_builder(@targets[target][:builder],
+                                 target,
+                                 @targets[target][:sources],
+                                 cache,
+                                 @targets[target][:vars] || {})
+            unless result
+              cache.write
+              raise BuildError.new("Failed to build #{target}")
+            end
+            result
           end
-          result = run_builder(@targets[target][:builder],
-                               target,
-                               @targets[target][:sources],
-                               cache,
-                               @targets[target][:vars] || {})
-          unless result
-            cache.write
-            raise BuildError.new("Failed to build #{target}")
-          end
-          result
         end
+        @targets.each do |target, target_params|
+          process_target.call(target)
+        end
+        cache.write
       end
-      @targets.each do |target, target_params|
-        process_target.call(target)
-      end
-      cache.write
     end
 
     # Clear all targets registered for the Environment.