gdb/134: Add a mechanism to reject certain expression classes to MI

[ac131313@cygnus.com]

>Number:         134
>Category:       gdb
>Synopsis:       Add a mechanism to reject certain expression classes to MI
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 06 20:08:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     ac131313@cygnus.com
>Release:        unknown-1.0
>Organization:
>Environment:

>Description:
Add a mechanism to reject certain expression classes to MI

There are situtations where you don't want GDB's expression
parser/evaluator to perform inferior function calls or variable
assignments.  A way of restricting the expression parser so that such
operations are not accepted would be very helpful.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: