Add 'build' DSL method.

Disallow processing Environments until configuration is performed.

lib/rscons/application.rb

@@ -68,6 +68,7 @@ module Rscons
     #   Exit code.
     def build(options)
       begin
+        @script.build
         Environment.environments.each do |env|
           env.process
         end

lib/rscons/environment.rb

@@ -15,6 +15,11 @@ module Rscons
       #   All Environments.
       attr_reader :environments
 
+      # Initialize class instance variables.
+      def class_init
+        @environments = []
+      end
+
       # Get an ID for a new Environment. This is a monotonically increasing
       # integer.
       #
@@ -77,8 +82,7 @@ module Rscons
         end
       end
       @echo = options[:echo] || :short
-      # TODO: remove the || "build" below when autoconf is turned on for build test specs
-      @build_root = "#{Cache.instance.configuration_data["build_dir"] || "build"}/e.#{@id}"
+      @build_root = "#{Cache.instance.configuration_data["build_dir"]}/e.#{@id}"
       load_configuration_data!
 
       if block_given?
@@ -273,6 +277,9 @@ module Rscons
     # @return [void]
     def process
       cache = Cache.instance
+      unless cache.configuration_data["configured"]
+        raise "Project must be configured before processing an Environment"
+      end
       failure = nil
       begin
         while @job_set.size > 0 or @threaded_commands.size > 0
@@ -1083,4 +1090,6 @@ module Rscons
     end
 
   end
+
+  Environment.class_init
 end

lib/rscons/script.rb

@@ -19,6 +19,11 @@ module Rscons
         @script.autoconf = autoconf
       end
 
+      # Enter build block.
+      def build(&block)
+        @script.operations["build"] = block
+      end
+
       # Enter configuration block.
       def configure(&block)
         @script.operations["configure"] = block
@@ -81,6 +86,13 @@ module Rscons
       Dsl.new(self).instance_eval(script_contents, path, 1)
     end
 
+    # Perform build operation.
+    def build
+      if build_proc = @operations["build"]
+        build_proc.call
+      end
+    end
+
     # Perform configure operation.
     def configure(configure_op)
       if operation_lambda = @operations["configure"]