remove superfluous includes

- reduce compile time by a little bit (full-core: ~0.7s for me)
- thanks to 'include-what-you-use' for some help
- include Standard C header files before any other (coding style)

1 files changed, 13 insertions, 5 deletions

diff --git a/tasks/mrbgem_spec.rake b/tasks/mrbgem_spec.rake
index 70c44ed5e..e9caf1d3a 100644
--- a/tasks/mrbgem_spec.rake
+++ b/tasks/mrbgem_spec.rake
@@ -149,7 +149,7 @@ module MRuby
         end
       end # generate_gem_init
 
-      def print_gem_init_header(f)
+      def print_gem_comment(f)
         f.puts %Q[/*]
         f.puts %Q[ * This file is loading the irep]
         f.puts %Q[ * Ruby GEM code.]
@@ -158,15 +158,23 @@ module MRuby
         f.puts %Q[ *   This file was generated!]
         f.puts %Q[ *   All manual changes will get lost.]
         f.puts %Q[ */]
+      end
+
+      def print_gem_init_header(f)
+        print_gem_comment(f)
+        f.puts %Q[#include <stdlib.h>] unless rbfiles.empty?
+        f.puts %Q[#include "mruby.h"]
+        f.puts %Q[#include "mruby/irep.h"] unless rbfiles.empty?
+      end
+
+      def print_gem_test_header(f)
+        print_gem_comment(f)
         f.puts %Q[#include <stdlib.h>]
         f.puts %Q[#include "mruby.h"]
+        f.puts %Q[#include "mruby/array.h"]
         f.puts %Q[#include "mruby/irep.h"]
-        f.puts %Q[#include "mruby/dump.h"]
         f.puts %Q[#include "mruby/string.h"]
-        f.puts %Q[#include "mruby/proc.h"]
         f.puts %Q[#include "mruby/variable.h"]
-        f.puts %Q[#include "mruby/array.h"]
-        f.puts %Q[#include "mruby/hash.h"]
       end
 
       def version_ok?(req_versions)