Diab defines w_char to be unsigned short.

cparser/Cutil.ml

@@ -721,7 +721,8 @@ let type_of_member env fld =
 
 let find_matching_unsigned_ikind sz =
   assert (sz > 0);
-  if sz = !config.sizeof_int then IUInt
+  if sz = !config.sizeof_short then IUShort
+  else if sz = !config.sizeof_int then IUInt
   else if sz = !config.sizeof_long then IULong
   else if sz = !config.sizeof_longlong then IULongLong
   else assert false

cparser/Machine.ml

@@ -170,6 +170,10 @@ let ppc_32_bigendian =
                    bitfields_msb_first = true;
                    supports_unaligned_accesses = true }
 
+let ppc_32_diab_bigendian =
+  { ppc_32_bigendian with sizeof_wchar = 2; wchar_signed = false }
+
+
 let arm_littleendian =
   { ilp32ll64 with name = "arm" }
 

cparser/Machine.mli

@@ -62,6 +62,7 @@ val x86_64 : t
 val win32 : t
 val win64 : t
 val ppc_32_bigendian : t
+val ppc_32_diab_bigendian : t
 val arm_littleendian : t
 
 val gcc_extensions : t -> t

driver/Driver.ml

@@ -661,7 +661,9 @@ let _ =
     Printexc.record_backtrace true;
     Machine.config :=
       begin match Configuration.arch with
-      | "powerpc" -> Machine.ppc_32_bigendian
+      | "powerpc" -> if Configuration.system = "linux"
+                     then Machine.ppc_32_bigendian
+                     else Machine.ppc_32_diab_bigendian
       | "arm"     -> Machine.arm_littleendian
       | "ia32"    -> if Configuration.abi = "macosx"
                      then Machine.x86_32_macosx

runtime/include/stddef.h

@@ -71,7 +71,7 @@ typedef signed long ptrdiff_t;
 #ifdef _TYPE_wchar_t
 _TYPE_wchar_t;
 #else
-typedef signed int wchar_t;
+typedef unsigned short wchar_t;
 #endif
 #endif
 #undef __need_wchar_t