[cfe-dev] Fwd: Objective-C in `goto` label block.

[Richard Smith]

On Fri, Feb 22, 2013 at 3:35 PM, Joe Groff <arcata at gmail.com> wrote:

> On Thu, Feb 21, 2013 at 7:24 PM, Hoon Hwangbo <drawtree at me.com> wrote:
>
>> Hello.
>>
>> I am testing `goto` with Objective-C (ARC enabled).
>> And I discovered Objective-C object cannot be exist under `goto` label.
>>
>>                         {
>>                                 AA*     a1;                     //
>>  Fine.
>>
>>                         LABEL3:
>>                                 AA*     a2;                     //
>>  Compiler error: "Expected expression".
>>                         }
>>
>
> This is a quirk of standard C99 grammar that isn't Objective-C specific—a
> label must be followed by a *statement*, not a declaration. This code is
> invalid C, for instance:
>
> void foo() {
> foo:
>   int x;
> }
>
> Putting an empty statement after the label works around it:
>
> void foo() {
> foo:;
>   int x;
> }
>

Ick. We should give a better diagnostic for this.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20130222/31186e0f/attachment.html>