mkmf.rb: fix framework option

* lib/mkmf.rb (have_framework): should append framework options to
  $LIBS, not $LDFLAGS.  the former is propagated to exts.mk when
  enable-static-linked-ext.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43277 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,5 +1,9 @@
 2013-10-14  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
+	* lib/mkmf.rb (have_framework): should append framework options to
+	  $LIBS, not $LDFLAGS.  the former is propagated to exts.mk when
+	  enable-static-linked-ext.
+
 	* lib/mkmf.rb (create_makefile): ranlib on static library, not DLLIB.
 
 2013-10-13  Andrew Grimm  <andrew.j.grimm@gmail.com>

ext/tk/extconf.rb

@@ -1487,8 +1487,8 @@ end
 
 def setup_for_macosx_framework(tclver, tkver)
   # use framework, but no tclConfig.sh
-  unless $LDFLAGS && $LDFLAGS.include?('-framework')
-    ($LDFLAGS ||= "") << ' -framework Tk -framework Tcl'
+  unless $LIBS && $LIBS.include?('-framework')
+    ($LIBS ||= "") << ' -framework Tk -framework Tcl'
   end
 
   if TkLib_Config["tcl-framework-header"]

lib/mkmf.rb

@@ -1098,7 +1098,7 @@ SRC
         # TODO: non-worse way than this hack, to get rid of separating
         # option and its argument.
         $LDFLAGS << " -ObjC" unless /(\A|\s)-ObjC(\s|\z)/ =~ $LDFLAGS
-        $LDFLAGS << opt
+        $LIBS << opt
         true
       else
         false