configure.in: find Setup file automatically

* configure.in (setup): find Setup file from target_os 1. by
  suffix (e.g. Setup.nacl, Setup.atheos), 2. by "platform"
  option (e.g. Setup.nt, Setup.emx), and 3. default Setup.  And
  Setup.dj had been removed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39486 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Mon Feb 25 13:12:39 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (setup): find Setup file from target_os 1. by
+	  suffix (e.g. Setup.nacl, Setup.atheos), 2. by "platform"
+	  option (e.g. Setup.nt, Setup.emx), and 3. default Setup.  And
+	  Setup.dj had been removed.
+
 Mon Feb 25 12:48:00 2013  Zachary Scott  <zachary@zacharyscott.net>
 
 	* thread.c: Document Thread::new, clean up ::fork and mention calling

configure.in

@@ -2580,21 +2580,22 @@ fi
 AC_SUBST(ENCOBJS)
 AC_SUBST(EXTOBJS)
 
-AS_CASE(["$target_os"],
-  dnl OS/2 environment w/ Autoconf 2.1x for EMX
-  [os2-emx], [
-    setup=Setup.emx
-    ],
-  [*djgpp*], [
-    setup=Setup.dj
-    ],
-  [nacl], [
-    setup=Setup.nacl
-    ],
-  [
-    setup=Setup
-    ])
-
+if test -f "$srcdir/ext/Setup.$target_os"; then
+    setup="Setup.$target_os"
+else
+    setup=
+    for file in "$srcdir"/ext/Setup.*; do
+	AS_CASE(["$file"], [*~|*.bak|*.orig|*.rej|*.tmp], [continue])
+	setup=`basename "$file"`
+	AS_CASE(["$target_os"], [`expr "$setup" : 'Setup.\(.*\)'`*], [break])
+	platform=`sed '/^option  *platform  */!d;s///;s/|/*|/g;q' "$file"`
+	if test "x$platform" != x; then
+	    eval "AS_CASE([\"\$target_os\"], [$platform*], [break])"
+	fi
+	setup=
+    done
+    : ${setup:=Setup}
+fi
 AC_SUBST(setup)
 
 test x"$prefix" = xNONE && prefix=$ac_default_prefix

ext/Setup.emx

@@ -1,3 +1,5 @@
+# OS/2 environment w/ Autoconf 2.1x for EMX
+option platform os2-emx
 option nodynamic
 
 #Win32API

ext/Setup.nt

@@ -1,3 +1,4 @@
+option platform cygwin|mingw|mswin
 #option nodynamic
 
 Win32API