re PR target/28896 (-fstack-limit-symbol and m68k and non 68020)

	PR target/28896
	* config/m68k/m68k.c (m68k_option_override): Reset stack_limit_rtx
	if !TARGET_68020.

testsuite/
	* gcc.target/m68k/stack-limit-1.c: New testcase.

From-SVN: r189210

gcc/ChangeLog

+2012-07-03  Andreas Schwab  <schwab@linux-m68k.org>
+
+	PR target/28896
+	* config/m68k/m68k.c (m68k_option_override): Reset stack_limit_rtx
+	if !TARGET_68020.
+
 2012-07-03  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/xmmintrin.h (_mm_sfence): Use __builtin_ia32_pause.

gcc/config/m68k/m68k.c

 /* Subroutines for insn-output.c for Motorola 68000 family.
    Copyright (C) 1987, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-   2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
+   2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -618,6 +618,12 @@ m68k_option_override (void)
     }
 #endif
 
+  if (stack_limit_rtx != NULL_RTX && !TARGET_68020)
+    {
+      warning (0, "-fstack-limit- options are not supported on this cpu");
+      stack_limit_rtx = NULL_RTX;
+    }
+
   SUBTARGET_OVERRIDE_OPTIONS;
 
   /* Setup scheduling options.  */

gcc/testsuite/ChangeLog

+2012-07-03  Andreas Schwab  <schwab@linux-m68k.org>
+
+	PR target/28896
+	* gcc.target/m68k/stack-limit-1.c: New testcase.
+
 2012-07-03  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/recursive_call.adb: New test.

gcc/testsuite/gcc.target/m68k/stack-limit-1.c

+/* -fstack-limit- should be ignored without an ICE if not supported.  */
+/* { dg-do compile } */
+/* { dg-options "-fstack-limit-symbol=_stack_limit -m68000" } */
+/* { dg-warning "not supported" "" { target *-*-* } 1 } */
+
+void dummy (void) { }