[Bug rust/31401] Error when placing watchpoint rust debug build

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31401

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Hi.  Thanks for the bug report.

(gdb) watch *0x123456789
Attempt to take contents of a non-pointer value.

Here you're attempting to dereference just some
random int.  gdb used to allow this in the old
days (maybe it still does in C mode, not sure).
However you really need a typed pointer here.
Or you can just watch an expression -- best is
with "-location", like:

(gdb) watch -location a


(gdb) watch *(char*)0x123456789
unexpected token

This one is C syntax, not Rust.


(gdb) watch "0x7fffffffd214"
Watchpoint 2: "0x7fffffffd214"

This one watches that particular string, which is
not really what you want.  Perhaps this should be
an error, except strings are coerced to memory and
so gdb thinks this might actually change at some point.


> Both of the examples above work normally in the release build.

This probably works because gdb doesn't see any Rust debug info
and so defaults to the "minimal" language, which is basically
the same as C.

Anyway I don't think there's a bug here.  I'm going to close
this report.

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