RFA: fix avr compile/limits-externdecl.c failures

[Joern Rennecke]

All the gcc.c-torture/compile/limits-externdecl.c currently give an
error: size of array is too large, followed by an ICE in
avr_encode_section_info, which goes on to try to find the address space
of error_mark_node.

Given the size of the array, it makes sense for the test to give an error
where POINTER_SIZE is 16 bit, but then, we should mark this as an expected
error for this target.
Moreover, we shouldn't ICE after the error.

The attached patch implements both these changes.

regression tested for i686-pc-linux-gnu X avr, Running target atmega128-sim
-------------- next part --------------
2013-05-13  Joern Rennecke <joern.rennecke@embecosm.com>

gcc:
	* config/avr/avr.c (avr_encode_section_info): Bail out if the type
	is error_mark_node.
gcc/testsuite:
	* testsuite/gcc.c-torture/compile/limits-externdecl.c [target avr-*-*]:
	Expect "size of array is too large" error.

Index: config/avr/avr.c
===================================================================
--- config/avr/avr.c	(revision 198829)
+++ config/avr/avr.c	(working copy)
@@ -8324,7 +8324,11 @@ avr_encode_section_info (tree decl, rtx
       && SYMBOL_REF == GET_CODE (XEXP (rtl, 0)))
    {
       rtx sym = XEXP (rtl, 0);
-      addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
+      tree type = TREE_TYPE (decl);
+
+      if (type == error_mark_node)
+	return;
+      addr_space_t as = TYPE_ADDR_SPACE (type);
 
       /* PSTR strings are in generic space but located in flash:
          patch address space.  */
Index: testsuite/gcc.c-torture/compile/limits-externdecl.c
===================================================================
--- testsuite/gcc.c-torture/compile/limits-externdecl.c	(revision 198829)
+++ testsuite/gcc.c-torture/compile/limits-externdecl.c	(working copy)
@@ -52,4 +52,4 @@ #define LIM6(x) LIM5(x##0) LIM5(x##1) LI
 REFERENCE references[] = {
   LIM5 (X)
   0
-};
+}; /* { dg-error "size of array is too large" "" { target avr-*-* } } */