From b64083376ef9fdd04ea48d7b4002934ab4f921b9 Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 31 May 2010 18:48:16 +0000
Subject: * ext/readline/extconf.rb: reject GPLv3 readline. [ruby-dev:39172]  
 [ruby-core:25272] [ruby-dev:39167] [ruby-core:28736]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@28118 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog               | 5 +++++
 ext/readline/extconf.rb | 8 +++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 750d624142..05853f4cf0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Jun  1 03:46:08 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* ext/readline/extconf.rb: reject GPLv3 readline. [ruby-dev:39172]
+	  [ruby-core:25272] [ruby-dev:39167] [ruby-core:28736]
+
 Tue Jun  1 01:14:31 2010  Masaya Tarui  <tarui@ruby-lnag.org>
 
 	* io.c (pipe_open): add RB_GC_GUARD.
diff --git a/ext/readline/extconf.rb b/ext/readline/extconf.rb
index 14c2099b6d..4ddc763d11 100644
--- a/ext/readline/extconf.rb
+++ b/ext/readline/extconf.rb
@@ -3,7 +3,7 @@ require "mkmf"
 $readline_headers = ["stdio.h"]
 
 def have_readline_header(header)
-  if have_header(header)
+  if have_header(header, &$readline_extra_check)
     $readline_headers.push(header)
     return true
   else
@@ -24,6 +24,12 @@ dir_config('ncurses')
 dir_config('termcap')
 dir_config("readline")
 enable_libedit = enable_config("libedit")
+$readline_extra_check = (proc {|src| src << <<EOS} unless enable_config("readline-v6"))
+#if RL_VERSION_MAJOR >= 6
+#error GPLv2 incompatible
+#endif
+EOS
+
 have_library("user32", nil) if /cygwin/ === RUBY_PLATFORM
 have_library("ncurses", "tgetnum") ||
   have_library("termcap", "tgetnum") ||
-- 
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