C/C++ PATCH to allow deprecating enum values (PR c/47043)
Ed Smith-Rowland
3dw4rd@verizon.net
Thu May 7 14:22:00 GMT 2015
On 05/07/2015 09:59 AM, Marek Polacek wrote:
> On Wed, May 06, 2015 at 11:17:20PM -0400, Ed Smith-Rowland wrote:
>> In addition to a PR this is 1/2 of a C=+17 feature. (The other half - really
>> a separate thing - is attributes on namespaces).
> Ah, nice, I wasn't aware. For the record, this is
> <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4266.html>.
>
>> I wonder if we should pedwarn for < C++17?
>> Or it could be just an extension for < C++17 - I guess that would match with
>> clang.
>
> Yeah, it is meant as a GNU extension. (clang supports this extension for
> several years already.) I'd rather let Jason decide what to do wrt C++17.
>
>> @@ -3651,11 +3651,6 @@ finish_id_expression (tree id_expression,
>> }
>> }
>>
>> - /* Handle references (c++/56130). */
>> - tree t = REFERENCE_REF_P (decl) ? TREE_OPERAND (decl, 0) : decl;
>> - if (TREE_DEPRECATED (t))
>> - warn_deprecated_use (t, NULL_TREE);
>> -
>> return decl;
>> }
>>
>> Why did this bit get removed?
> This hunk got added in r201906 to address c++/56130 - we didn't warn for
> deprecated references:
>
> int g_nn;
> int& g_n __attribute__((deprecated)) = g_nn;
>
> int main()
> {
> g_n = 1;
> }
>
> But then Jason added warn_deprecated_use to mark_used in r217677 and we
> warned twice. So I figured the warning in finish_id_expression isn't
> needed anymore.
>
>> Do we handle enums in template specializations?
> Not sure, could you provide a testcase? Thanks,
>
> Marek
>
Instead of NULL_TREE in pt.c I grabbed the attrs.
/* Actually build the enumerator itself. */
build_enumerator
(DECL_NAME (decl), value, newtag, DECL_ATTRIBUTES (decl),
DECL_SOURCE_LOCATION (decl));
Seems to work.
Also, I haven't tested the testcase in terms of the pattern matching of
the error. Tweak it if necessary.
Thanks for this.
Ed
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