nobu	2013-01-21 13:51:24 +0900 (Mon, 21 Jan 2013)

  New Revision: 38889

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=38889

  Log:
    mkmf.rb: $extmk for symlink
    
    * lib/mkmf.rb ($extmk): traverse parent directories for the case
      srcdir is a symlink.

  Modified files:
    trunk/ChangeLog
    trunk/lib/mkmf.rb

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 38888)
+++ ChangeLog	(revision 38889)
@@ -1,3 +1,8 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Mon Jan 21 13:51:21 2013  Nobuyoshi Nakada  <nobu@r...>
+
+	* lib/mkmf.rb ($extmk): traverse parent directories for the case
+	  srcdir is a symlink.
+
 Sun Jan 20 23:55:37 2013  Nobuyoshi Nakada  <nobu@r...>
 
 	* marshal.c (w_object, r_object0): separate respond_to checks and
Index: lib/mkmf.rb
===================================================================
--- lib/mkmf.rb	(revision 38888)
+++ lib/mkmf.rb	(revision 38889)
@@ -199,9 +199,14 @@ module MakeMakefile https://github.com/ruby/ruby/blob/trunk/lib/mkmf.rb#L199
 
   topdir = File.dirname(File.dirname(__FILE__))
   path = File.expand_path($0)
-  $extmk = path[0, topdir.size+1] == topdir+"/"
-  $extmk &&= %r"\A(?:ext|enc|tool|test(?:/.+)?)\z" =~ File.dirname(path[topdir.size+1..-1])
-  $extmk &&= true
+  until (dir = File.dirname(path)) == path
+    if File.identical?(dir, topdir)
+      $extmk = true if %r"\A(?:ext|enc|tool|test)\z" =~ File.basename(path)
+      break
+    end
+    path = dir
+  end
+  $extmk ||= false
   if not $extmk and File.exist?(RbConfig::CONFIG["rubyhdrdir"] + "/ruby/ruby.h")
     $hdrdir = CONFIG["rubyhdrdir"]
     $topdir = $hdrdir

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