[vxworks] [ppc] match TARGET_VXWORKS64 to TARGET_64BITHEADtrunkmaster

Configuring gcc for --target=powerpc-wrs-vxworks7r2 sets things up for
a 64-bit compiler, just like powerpc64-wrs-vxworks7r2, except that
TARGET_VXWORKS64 is only defined as 1 for targets that match
*64-*-vxworks*.

With !TARGET_VXWORKS64, we get a 64-bit toolchain that defines
SIZE_TYPE, PTRDIFF_TYPE, and WCHAR_TYPE as 32-bit types, and that
breaks GCC passes that expect SIZE_TYPE and PTRDIFF_TYPE to be as wide
as pointers.

Arrange for TARGET_VXWORKS64 on ppc to match TARGET_64BIT, after using
it to select the default word size with driver self specs.


for  gcc/ChangeLog

	* config/rs6000/vxworks.h (SUBTARGET_DRIVER_SELF_SPECS):
	Redefine to select word size matching TARGET_VXWORKS64.
	(TARGET_VXWORKS64): Redefine in terms of TARGET_64BIT.

1 files changed, 15 insertions, 0 deletions

diff --git a/gcc/config/rs6000/vxworks.h b/gcc/config/rs6000/vxworks.h
index fa2c837b..e77247b 100644
--- a/gcc/config/rs6000/vxworks.h
+++ b/gcc/config/rs6000/vxworks.h
@@ -34,6 +34,21 @@ along with GCC; see the file COPYING3.  If not see
 /* Common definitions first.                                   */
 /*-------------------------------------------------------------*/
 
+/* Default to 64 bits when the target is powerpc64*-wrs-vxworks*,
+   and to 32 bits otherwise.  */
+#undef SUBTARGET_DRIVER_SELF_SPECS
+#if TARGET_VXWORKS64
+#define SUBTARGET_DRIVER_SELF_SPECS "%{!m64:%{!m32:-m64}}"
+#else
+#define SUBTARGET_DRIVER_SELF_SPECS "%{!m32:%{!m64:-m32}}"
+#endif
+
+/* Having used the build-time TARGET_VXWORKS64 to choose the default ABI above,
+   redefine it so that it matches whichever ABI is selected for each
+   compilation.  */
+#undef TARGET_VXWORKS64
+#define TARGET_VXWORKS64 TARGET_64BIT
+
 /* CPP predefined macros.  */
 
 #undef TARGET_OS_CPP_BUILTINS