re PR target/25299 (Another ABI incompatibility with Apple's gcc)

	PR target/25299
	* config/rs6000/rs6000.c (rs6000_special_round_type_align): Increase
	alignment to doubleword if the first field is a double array.
	* config/rs6000/linux64.h (TARGET_ALIGN_NATURAL): Define.

From-SVN: r108393

gcc/ChangeLog

+2005-12-12  Alan Modra  <amodra@bigpond.net.au>
+
+	PR target/25299
+	* config/rs6000/rs6000.c (rs6000_special_round_type_align): Increase
+	alignment to doubleword if the first field is a double array.
+	* config/rs6000/linux64.h (TARGET_ALIGN_NATURAL): Define.
+
 2005-12-11  Daniel Berlin  <dberlin@dberlin.org>
 
 	* tree-ssa-structalias.c (process_constraint): Remove code to

gcc/config/rs6000/linux64.h

@@ -236,6 +236,12 @@ extern int dot_symbols;
    ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED)	\
    : MAX ((COMPUTED), (SPECIFIED)))
 
+/* Use the default for compiling target libs.  */
+#ifdef IN_TARGET_LIBS
+#undef TARGET_ALIGN_NATURAL
+#define TARGET_ALIGN_NATURAL 1
+#endif
+
 /* Indicate that jump tables go in the text section.  */
 #undef  JUMP_TABLES_IN_TEXT_SECTION
 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT

gcc/config/rs6000/rs6000.c

@@ -2513,7 +2513,10 @@ rs6000_special_round_type_align (tree type, int computed, int specified)
   while (field != NULL && TREE_CODE (field) != FIELD_DECL)
     field = TREE_CHAIN (field);
 
-  if (field == NULL || field == type || DECL_MODE (field) != DFmode)
+  if (field == NULL || field == type
+      || TYPE_MODE (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
+		    ? get_inner_array_type (field)
+		    : TREE_TYPE (field)) != DFmode)
     return MAX (computed, specified);
 
   return MAX (MAX (computed, specified), 64);