Description of problem:

Hello there,

I just tried to compile package php-4.2.2-17 from Redhat 9.0
with compiler flag -Wall.

The compiler said

/usr/src/redhat/BUILD/php-4.2.2/ext/imap/php_imap.c:2291: warning: operation on
`outp' may be undefined
/usr/src/redhat/BUILD/php-4.2.2/ext/imap/php_imap.c:2297: warning: operation on
`outp' may be undefined
/usr/src/redhat/BUILD/php-4.2.2/ext/imap/php_imap.c:2401: warning: operation on
`outp' may be undefined
/usr/src/redhat/BUILD/php-4.2.2/ext/imap/php_imap.c:2414: warning: operation on
`outp' may be undefined
/usr/src/redhat/BUILD/php-4.2.2/ext/imap/php_imap.c:2419: warning: operation on
`outp' may be undefined

As an example, consider the first piece of source code

*outp++ |= outp[1] >> 4;

You would be much better off with 

*outp |= outp[1] >> 4;
++outp;





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