* configure.in (--no-undefined): r33840 breaks FreeBSD and DragonFly

with gcc 4.4 or later. Their environ is in /usr/libexec/ld-elf.so.1,
  so it will be false negative.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33856 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,8 +1,8 @@
 Sun Nov 27 04:57:11 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
-	* configure.in (--no-undefined): r33840 breaks FreeBSD with gcc47.
-	  FreeBSD's environ is in /usr/libexec/ld-elf.so.1, so it will be
-	  false negative.
+	* configure.in (--no-undefined): r33840 breaks FreeBSD and DragonFly
+	  with gcc 4.4 or later. Their environ is in /usr/libexec/ld-elf.so.1,
+	  so it will be false negative.
 
 Sun Nov 27 04:55:45 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 

configure.in

@@ -2268,7 +2268,7 @@ AS_CASE("$enable_shared", [yes], [
   fi
 
   AS_CASE(["$target_os"],
-    [freebsd*], ,
+    [freebsd*|dragonfly*], [],
     [
      if test "$GCC" = yes; then
        RUBY_TRY_LDFLAGS([-Xlinker --no-undefined], RUBY_APPEND_OPTION(EXTLDFLAGS, [-Xlinker --no-undefined]))