From 132415bf9ea534c900e1f066ad38fe8fe3b218e1 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 23 Dec 2014 13:07:39 +0000
Subject: [PATCH] extconf.rb: no empty CPP

* ext/fiddle/extconf.rb: pass CPP only if necessary, should not
  make it empty.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48933 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/fiddle/extconf.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/fiddle/extconf.rb b/ext/fiddle/extconf.rb
index 1333bf549d..3b885d2ff0 100644
--- a/ext/fiddle/extconf.rb
+++ b/ext/fiddle/extconf.rb
@@ -65,11 +65,11 @@ begin
     --enable-builddir=#{RUBY_PLATFORM}
   ]
   args << libffi.opt if libffi.opt
+  args << "CPP=#{cpp}" if cpp
   args.concat %W[
       CC=#{cc} CFLAGS=#{libffi.cflags}
       CXX=#{cxx} CXXFLAGS=#{RbConfig.expand("$(CXXFLAGS)", nowarn)}
       LD=#{ld} LDFLAGS=#{libffi.ldflags}
-      CPP=#{cpp}
   ]
 
   FileUtils.rm_f("#{libffi.include}/ffitarget.h")