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  On Sun, Sep 1, 2024, at 12:24, Tiago Freire via Std-Proposals wrote:
> Hence you don't specify it. If stat'ing or <insert function name here>
> returns the same information for what are different files, then <insert
> function name here> is not the way to distinguish different files.
> Submit a bug report and fix that implementation for that platform.
>

It will be closed WON'T FIX. the iso standards comittee does not have the ability to force this issue. Best case they will do a ten year transisition and so you a looking at, C++37 before this works. we are talking about this because modules are taking longer than hoped in the real world but I it seems likely they will be universal before then.



> ________________________________
> From: Std-Proposals <std-proposals-bounces_at_[hidden]> on behalf
> of Thiago Macieir via Std-Proposals <std-prposals_at_[hidden]>
> Sent: Sunday, September 1, 2024 6:44:13 PM
> To: std-proposals_at_[hidden] <std-proposals_at_[hidden]>;
> Jeremy Rifkin <rifkin.jer_at_[hidden]>
> Cc: Thiago Macieira <thiago_at_[hidden]>
> Subject: Re: [std-proposals] Revising #pragma once
>
> On Sunday 1 September 2024 09:17:05 GMT-7 Jeremy Rifkin wrote:
>> I agree. Much of the point of standardizing would be providing
>> guarantees about what "same file" means.
>>
>> For wording, one option is to borrow some wording from
>> std::filesystem::equivalent
>
> And again, as Tom's report showed but he didn't highlight,
> std::filesystem::equivalent will come to different conclusions too.
>
> The MS STL implementation uses GetFileInformationByHandleEx(), so it can
> compare the 128-bit unique identifier. The libstdc++v3 and libcxx
> implementations use GetFileInformationByHandle(), so they suffer from the same
> problem as Coverity did. And then you have Cygwin, whose source of stat() I
> can't find, but is used to supply the builds of GCC, so GCC's fs::equivalent
> will be the Unix implementation through Cygwin, not the native Windows build.
>
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
> Principal Engineer - Intel DCAI Platform & System Engineering
>
>
>
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