widl: Pass 16-byte structures by value on ARM64.

tools/widl/typegen.c

@@ -431,7 +431,18 @@ static unsigned int get_stack_size( const var_t *var, int *by_value )
     case TGT_UNION:
     case TGT_USER_TYPE:
         stack_size = type_memsize( var->declspec.type );
-        by_val = (pointer_size < 8 || stack_size <= pointer_size); /* FIXME: should be platform-specific */
+        switch (target.cpu)
+        {
+        case CPU_x86_64:
+            by_val = (stack_size <= pointer_size);
+            break;
+        case CPU_ARM64:
+            by_val = (stack_size <= 2 * pointer_size);
+            break;
+        default:
+            by_val = 1;
+            break;
+        }
         break;
     default:
         by_val = 0;

tools/widl/widl.c

@@ -89,7 +89,7 @@ static const char usage[] =
 static const char version_string[] = "Wine IDL Compiler version " PACKAGE_VERSION "\n"
 			"Copyright 2002 Ove Kaaven\n";
 
-static struct target target;
+struct target target = { 0 };
 
 int debuglevel = DEBUGLEVEL_NONE;
 int parser_debug, yy_flex_debug;

tools/widl/widl.h

@@ -71,6 +71,7 @@ extern const char *prefix_client;
 extern const char *prefix_server;
 extern unsigned int packing;
 extern unsigned int pointer_size;
+extern struct target target;
 extern time_t now;
 
 extern int open_typelib( const char *name );