+1.

-- Gaby

________________________________
From: Core <core-bounces_at_[hidden]> on behalf of Herring, Davis via Core <core_at_[hidden]>
Sent: Wednesday, February 8, 2023 11:31:47 AM
To: Uecker, Martin <Martin.Uecker_at_[hidden]>
Cc: Herring, Davis <herring_at_[hidden]>; core_at_[hidden] <core_at_[hidden]>; Liaison_at_[hidden] <Liaison_at_[hidden]>; ext_at_[hidden] <ext_at_[hidden]>
Subject: Re: [isocpp-core] [wg14/wg21 liaison] Ignorability of attributes: draft wording, and concern about __has_c_attribute

>> I'm not sure why this is different from any other feature-test macro.
>> [...]
>
> What would be the use case for this?

Well, certainly some feature-test macros indicate the presence of significant portable functionality: __cpp_lib_ranges_iota, for example. It is equally certain that feature-test macros are of less value when they indicate the presence of things that do not have such portable functionality. Set against this is the questionable value that a "really does what I ask" test has in a context where "really" isn't very meaningful.

Davis
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