Talk about silly byte-shaving ... the "stock" value of STACK_MIN_SIZE
does not work on s390x, and probably not on some other platforms either.
Knock it up to twice the pre-5.0.33 value to have some margin for future
changes in compiler, glibc, etc.  Suspect this number if
"execution_constants" regression test fails.

Note: STACK_MIN_SIZE has to be enough less than DEFAULT_THREAD_STACK / 8
to provide some headroom, which means that its value can't be raised too much
further without increasing the latter as well.


diff -Naur mysql-5.0.45.orig/sql/mysql_priv.h mysql-5.0.45/sql/mysql_priv.h
--- mysql-5.0.45.orig/sql/mysql_priv.h	2007-07-04 09:06:41.000000000 -0400
+++ mysql-5.0.45/sql/mysql_priv.h	2008-01-08 17:32:22.000000000 -0500
@@ -173,7 +173,7 @@
  Feel free to raise this by the smallest amount you can to get the
  "execution_constants" test to pass.
  */
-#define STACK_MIN_SIZE          12000   // Abort if less stack during eval.
+#define STACK_MIN_SIZE          16384   // Abort if less stack during eval.
 
 #define STACK_MIN_SIZE_FOR_OPEN 1024*80
 #define STACK_BUFF_ALLOC        352     // For stack overrun checks