objc/7808: Compiler ignores cast from 'id<Protocol>' to 'id' or from 'id<Protocol1>' to 'id<Protocol2>'

objc/7808: Compiler ignores cast from 'id<Protocol>' to 'id' or from 'id<Protocol1>' to 'id<Protocol2>'

[Nicola Pero]

>Number:         7808
>Category:       objc
>Synopsis:       Compiler ignores cast from 'id<Protocol>' to 'id' or from 'id<Protocol1>' to 'id<Protocol2>'
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 02 03:36:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Nicola Pero <nicola@brainstorm.co.uk>
>Release:        GCC 3.3 (also reported in 3.2)
>Organization:
>Environment:

>Description:
The compiler seems to be ignoring casts from 'id<Protocol>'
to 'id', and from 'id<Protocol1>' to 'id<Protocol2>'.

It's a regression: previous compilers (eg 2.95 and 2.91.66)
did the cast properly.
>How-To-Repeat:
Compile the attached testcase - no warnings should be 
generated.

Under 3.3 (and, I was told, under 3.2) spurious warnings are
generated instead because the compiler seems to be ignoring
the casts
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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Re: objc/7808: Compiler ignores cast from 'id<Protocol>' to 'id' or from 'id<Protocol1>' to 'id<Protocol2>'

[nicola]

Synopsis: Compiler ignores cast from 'id<Protocol>' to 'id' or from 'id<Protocol1>' to 'id<Protocol2>'

State-Changed-From-To: open->closed
State-Changed-By: nicola
State-Changed-When: Tue Sep 17 07:28:19 2002
State-Changed-Why:
    Fixed on GCC 3.3 CVS

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7808