task/ext.rake in rucy-0.1.0 vs task/ext.rake in rucy-0.1.1

@@ -8,29 +8,30 @@
   outname = "#{name}.#{EXTEXT}"
   out     = File.join EXTDIR, outname
 
   extconf  = File.join dir, "extconf.rb"
   makefile = File.join dir, "Makefile"
-  depends  = File.join dir, "depends"
+  depend   = File.join dir, "depend"
 
   cpps = Dir.glob("#{dir}/**/*.cpp")
 
-  task :build => out
+  task :build => makefile do
+    sh %( cd #{dir} && #{MAKE} )
+  end
 
   task :clean do
     sh %( cd #{dir} && #{MAKE} clean ) if File.exist? makefile
-    sh %( rm -f #{makefile} #{depends} )
+    sh %( rm -f #{makefile} #{depend} )
   end
 
-  file out => makefile do
-    sh %( cd #{dir} && #{MAKE} )
-  end
-
-  file makefile => [extconf, "lib:build"] do #, depends] do
+  file makefile => [extconf, depend] do
     sh %( cd #{dir} && #{RUBY} #{File.basename extconf} )
   end
 
-  file depends => cpps do
-    sh %( cd #{dir} && touch #{depends} )
+  file depend => ["lib:build"] + cpps do
+    incdirs = INCDIRS.map{|s| " -I#{s}"}.join
+    srcs = cpps.map{|cpp| File.basename cpp}.join ' '
+    dep = File.basename depend
+    sh %( cd #{dir} && #{CC} -M #{CFLAGS} #{incdirs} #{srcs} > #{dep} )
   end
 
 end# :ext