On 64 bit, subtracting two pointers produces a long result. On 32 bit, it's an int. Even though long _is_ 32 bits on a 32 bit systems, gcc warns about it because reasons. Also, the warning being that "expects int, but type is wchar_t"... no, type is not wchar_t. Type is probably long. Specify the ACTUAL TYPE, not the random typedef alias for it. If the translated type _did_ match, there wouldn't be a warning! (This is why c89 promoted all arguments to int, precisely so this wasn't a problem.)

--- a/toys/posix/find.c	Sun Mar 01 16:43:01 2015 -0600
+++ b/toys/posix/find.c	Mon Mar 02 20:27:50 2015 -0600
@@ -165,7 +165,7 @@
         // encode back to utf8, something is wrong with your libc. But just
         // in case somebody finds an exploit...
         len = wcrtomb(new, c, 0);
-        if (len < 1) error_exit("bad utf8 %x", c);
+        if (len < 1) error_exit("bad utf8 %x", (int)c);
         new += len;
       }
     }