real.c: Avoid parse error if FLOAT_WORDS_BIG_ENDIAN is not a compile-time constant for...

* real.c: Avoid parse error if FLOAT_WORDS_BIG_ENDIAN is
not a compile-time constant for the non-IBM case.
* config/arm/arm-protos.h (arm_float_words_big_endian): New
prototype.
* config/arm/arm.c (arm_float_words_big_endian): New function.
* config/arm/arm.h (TARGET_CPU_CPP_BUILTINS): Define __VFP_FP__
if TARGET_VFP  and not TARGET_HARD_FLOAT.
(ARM_FLAG_VFP, TARGET_VFP): Define.
(FLOAT_WORDS_BIG_ENDIAN): Use arm_float_words_big_endian.

[ Missed arm.h in previous checkin, and pasto'd ChangeLog entry, which
  is now corrected. ]

From-SVN: r56857

gcc/ChangeLog

@@ -10,8 +10,8 @@
 	* config/arm/arm-protos.h (arm_float_words_big_endian): New
 	prototype. 
 	* config/arm/arm.c (arm_float_words_big_endian): New function.
-	(TARGET_CPU_CPP_BUILTINS): Define __VFP_FP__ if TARGET_VFP  
-	and not TARGET_HARD_FLOAT. 
+	* config/arm/arm.h (TARGET_CPU_CPP_BUILTINS): Define __VFP_FP__
+	if TARGET_VFP  and not TARGET_HARD_FLOAT. 
 	(ARM_FLAG_VFP, TARGET_VFP): Define. 
 	(FLOAT_WORDS_BIG_ENDIAN): Use arm_float_words_big_endian.
 

gcc/config/arm/arm.h

@@ -58,6 +58,11 @@ Boston, MA 02111-1307, USA.  */
 	if (TARGET_SOFT_FLOAT)				\
 	  builtin_define ("__SOFTFP__");		\
 							\
+	/* FIXME: TARGET_HARD_FLOAT currently implies	\
+	   FPA.  */					\
+	if (TARGET_VFP && !TARGET_HARD_FLOAT)		\
+	  builtin_define ("__VFP_FP__");		\
+							\
 	/* Add a define for interworking.		\
 	   Needed when building libgcc.a.  */		\
 	if (TARGET_INTERWORK)				\
@@ -365,6 +370,9 @@ Unrecognized value in TARGET_CPU_DEFAULT.
    destination is non-Thumb aware.  */
 #define THUMB_FLAG_CALLER_SUPER_INTERWORKING	(1 << 20)
 
+/* Nonzero means target uses VFP FP.  */
+#define ARM_FLAG_VFP		(1 << 21)
+
 #define TARGET_APCS_FRAME		(target_flags & ARM_FLAG_APCS_FRAME)
 #define TARGET_POKE_FUNCTION_NAME	(target_flags & ARM_FLAG_POKE)
 #define TARGET_FPE			(target_flags & ARM_FLAG_FPE)
@@ -375,6 +383,7 @@ Unrecognized value in TARGET_CPU_DEFAULT.
 #define TARGET_MMU_TRAPS		(target_flags & ARM_FLAG_MMU_TRAPS)
 #define TARGET_SOFT_FLOAT		(target_flags & ARM_FLAG_SOFT_FLOAT)
 #define TARGET_HARD_FLOAT		(! TARGET_SOFT_FLOAT)
+#define TARGET_VFP			(target_flags & ARM_FLAG_VFP)
 #define TARGET_BIG_END			(target_flags & ARM_FLAG_BIG_END)
 #define TARGET_INTERWORK		(target_flags & ARM_FLAG_INTERWORK)
 #define TARGET_LITTLE_WORDS		(target_flags & ARM_FLAG_LITTLE_WORDS)
@@ -666,8 +675,9 @@ extern int arm_is_6_or_7;
 #endif
 
 /* Define this if most significant word of doubles is the lowest numbered.
-   This is always true, even when in little-endian mode.  */
-#define FLOAT_WORDS_BIG_ENDIAN 1
+   The rules are different based on whether or not we use FPA-format or
+   VFP-format doubles.  */
+#define FLOAT_WORDS_BIG_ENDIAN (arm_float_words_big_endian ())
 
 #define UNITS_PER_WORD	4