Re: [PATCH 1/1] libc: Added implementations and prototypes for

[Brian Inglis <Brian.Inglis@SystematicSw.ab.ca>]

On 2021-07-29 03:23, Corinna Vinschen wrote:
> On Jul 28 15:13, Joel Sherrill wrote:
>> On Wed, Jul 28, 2021, 2:54 PM C Howland wrote:
>>>> On Wed, Jul 28, 2021 at 1:46 PM Corinna Vinschen wrote:
>>>>> On Jul 28 09:25, Brian Inglis wrote:
>>>>>> On 2021-07-28 03:11, Corinna Vinschen wrote:
>>>>>>> On Jul 24 10:37, Matt Joyce wrote:
>>>>>>>> +#if __GNU_VISIBLE

>>>>>>> What we need, in fact, is a __POSIX_VISIBLE guard, but
>>>>>>> here's the problem: As far as I can see, the Issue 8
>>>>>>> draft does not yet define a version number.
>>>>>>> If anybody has better information or a good idea how to 
>>>>>>> guard this new API in the meantime, I'm all ears.

>>>>>> Current values are:
>>>>>>
>>>>>> __POSIX_VISIBLE 199009
>>>>>> __POSIX_VISIBLE 199209
>>>>>> __POSIX_VISIBLE 199309
>>>>>> __POSIX_VISIBLE 199506
>>>>>> __POSIX_VISIBLE 200112
>>>>>> __POSIX_VISIBLE 200809
>>>>>> __POSIX_VISIBLE 201402
> 
> Where did you find the latter one?  Per the Open Group docs
> https://pubs.opengroup.org/onlinepubs/9699919799/ the latest valid value
> for _POSIX_C_SOURCE is still 200809, even with POSIX.1-2017.

Searched all installed include files for all __POSIX_VISIBLE date 
expressions [Paste As Quotation avoids wrapping commands and output]:

> $ grep '__POSIX_VISIBLE.*[12][90][0-9][0-9][01][0-9]' /usr/{,*86*/sys-root/*/}include/**/*.h

To answer your question:

 > $ grep '__POSIX_VISIBLE.*2014' /usr/{,*86*/sys-root/*/}include/**/*.h
> /usr/include/pthread.h:#if __XSI_VISIBLE >= 500 || __POSIX_VISIBLE >= 200112 || __cplusplus >= 201402L

I used sed to extract and standardize so I could sort -u to get the 
list, which I saved and added a few comments to:

> /* POSIX-version-dates.h - POSIX dates found in headers and related standards */
> 
> #define	__POSIX_VISIBLE 199009	/* Issue 1 */
> #define	__POSIX_VISIBLE 199209	/* Issue 2 */
> #define	__POSIX_VISIBLE 199309	/* Issue 3 UNIX 93 */
> #define	__POSIX_VISIBLE 199506	/* Issue 4 SUS V1 UNIX 95 XPG4 COSE Spec 1170 */
> #define	__POSIX_VISIBLE 200112	/* Issue 5 SUS V3 UNIX 03 */
> #define	__POSIX_VISIBLE 200809	/* Issue 6 SUS V4 */
> #define	__POSIX_VISIBLE 201402	/* Issue 7 SUS V4 TC1 UNIX V7 */
> #define	__POSIX_VISIBLE 202202?	/* Issue 8 SUS V5? UNIX V8? */

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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