The 'expr' command now detects and reports integer overflow.

diff --git a/ChangeLog b/ChangeLog
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+++ b/ChangeLog
@@ -1,7 +1,15 @@
-2006-06-05  Paul Eggert  <eggert@cs.ucla.edu>
+2006-06-06  Paul Eggert  <eggert@cs.ucla.edu>
 
        * Version 6.0-cvs.
 
+       * NEWS: The 'expr' command now detects and reports integer overflow.
+       (It would be better to use extended precision instead, but that
+       would be more work.)
+       * src/expr.c (integer_overflow): New function.
+       (eval4, eval3): Check for integer overflow.
+
+2006-06-05  Paul Eggert  <eggert@cs.ucla.edu>
+
        Fix problems when building with Solaris/SVR4/etc. make, which uses a
        different and somewhat bogus implementation of VPATH.  In the
        directory tests/misc, rename tests whose names might appear in the