Refine definitions for wchar_t/wint_t on VxWorks

This change refines the VxWorks macro definitions configuring
wchar_t to accommodate the VxWorks7 environment, where wchar_t
is now typically a 32bit type.

We also ensure that the definitions for wint_t are always based
on those for wchar_t, so the two remain in sync in environments
where WCHAR_TYPE is redefined for a specific CPU architecture.

2019-12-30  Alexandre Oliva  <oliva@adacore.com>
           Olivier Hainque  <hainque@adacore.com>

	* config/vx-common.h (WCHAR_TYPE_SIZE): 32 on VxWorks 7.
	(WCHAR_TYPE): Pick accordingly.
	(WINT_TYPE_SIZE): Define in terms of WCHAR_TYPE_SIZE.
	(WINT_TYPE): Define in terms of WCHAR_TYPE.

Co-Authored-By: Olivier Hainque <hainque@adacore.com>

From-SVN: r279780

gcc/ChangeLog

+2019-12-30  Alexandre Oliva  <oliva@adacore.com>
+            Olivier Hainque  <hainque@adacore.com>
+
+	* config/vx-common.h (WCHAR_TYPE_SIZE): 32 on VxWorks 7.
+	(WCHAR_TYPE): Pick accordingly.
+	(WINT_TYPE_SIZE): Define in terms of WCHAR_TYPE_SIZE.
+	(WINT_TYPE): Define in terms of WCHAR_TYPE.
+
 2019-12-30  Olivier Hainque  <hainque@adacore.com>
 
 	* config/vx-common.h: Minor reorganization and add

gcc/config/vx-common.h

@@ -43,17 +43,32 @@ along with GCC; see the file COPYING3.  If not see
 
 /* ----------------------- Common type descriptions -----------------------  */
 
-/* VxWorks uses wchar_t == unsigned short (UCS2) on all architectures.  */
+/* Regardless of the target architecture, VxWorks uses a signed 32bit
+   integer for wchar_t starting with vx7 SR06xx.  An unsigned short
+   otherwise.  */
+#if TARGET_VXWORKS7
+
+#undef WCHAR_TYPE_SIZE
+#define WCHAR_TYPE_SIZE 32
 #undef WCHAR_TYPE
-#define WCHAR_TYPE "short unsigned int"
+#define WCHAR_TYPE (TARGET_VXWORKS64 ? "int" : "long int")
+
+#else
+
 #undef WCHAR_TYPE_SIZE
 #define WCHAR_TYPE_SIZE 16
+#undef WCHAR_TYPE
+#define WCHAR_TYPE "short unsigned int"
 
-/* Likewise wint_t.  */
-#undef WINT_TYPE
-#define WINT_TYPE "short unsigned int"
+#endif
+
+/* The VxWorks headers base wint_t on the definitions used for wchar_t.
+   Do the same here to make sure they remain in sync, in case WCHAR_TYPE
+   gets redefined for a specific CPU architecture.  */
 #undef WINT_TYPE_SIZE
-#define WINT_TYPE_SIZE 16
+#define WINT_TYPE_SIZE WCHAR_TYPE_SIZE
+#undef WINT_TYPE
+#define WINT_TYPE WCHAR_TYPE
 
 /* ---------------------- Debug and unwind info formats ------------------  */