raise Rscons::BuildError on a build failure

lib/rscons.rb

@@ -17,4 +17,7 @@ module Rscons
     Object,
     Program,
   ]
+
+  class BuildError < Exception
+  end
 end

lib/rscons/cache.rb

@@ -80,6 +80,7 @@ module Rscons
     # @return true value if the target is up to date, meaning that:
     #   - the target exists on disk
     #   - the cache has information for the target
+    #   - the target's checksum matches its checksum when it was last built
     #   - the command used to build the target is the same as last time
     #   - all dependencies listed are also listed in the cache, or, if
     #     :strict_deps was given in options, the list of dependencies is
@@ -93,6 +94,9 @@ module Rscons
       # target must be registered in the cache
       return false unless @cache[:targets].has_key?(target)
 
+      # target must have the same checksum as when it was built last
+      return false unless @cache[:targets][target][:checksum] == lookup_checksum(target)
+
       # command used to build target must be identical
       return false unless @cache[:targets][target][:command] == command
 
@@ -141,7 +145,7 @@ module Rscons
     # Calculate and return a file's checksum
     # @param file [String] The file name.
     def calculate_checksum(file)
-      @lookup_checksums[file] = Digest::MD5.hexdigest(File.read(file)).encode(__ENCODING__) rescue ''
+      @lookup_checksums[file] = Digest::MD5.hexdigest(File.read(file, {mode: 'rb'})).encode(__ENCODING__) rescue ''
     end
   end
 end

lib/rscons/environment.rb

@@ -149,8 +149,7 @@ module Rscons
       @targets.each do |target, info|
         next if targets_processed.include?(target)
         unless process_target.call(target)
-          $stderr.puts "Error: failed to build #{target}"
-          break
+          raise BuildError.new("Failed to build #{target}")
         end
       end
       cache.write

lib/rscons/version.rb

@@ -1,4 +1,4 @@
 module Rscons
   # gem version
-  VERSION = "0.0.2"
+  VERSION = "0.0.4"
 end