[PATCH] Use __BSD_VISIBLE for RTEMS <sys/_termios.h>

Craig Howland howland@LGSInnovations.com
Wed May 24 14:51:00 GMT 2017

On 05/24/2017 05:29 AM, Sebastian Huber wrote:
> On 24/05/17 07:42, Sebastian Huber wrote:
>> On 23/05/17 17:16, Craig Howland wrote:
>>> On 05/23/2017 04:23 AM, Sebastian Huber wrote:
>>>> The Termios header <sys/_termios.h> used _POSIX_SOURCE directly to
>>>> determine if a thing should be exposed to the user.  This circumvented
>>>> the feature mechanisms of <sys/cdefs.h>.
>>> Would you please explain why !_POSIX_SOURCE being replaced with 
>>> __BSD_VISIBLE rather than, for example, !__POSIX_VISIBLE?
>> A negation of visibility define makes no sense.
>>> That is, you seem to not only be updating to sys/features.h macro names, but 
>>> also shifting exactly how the gate is done.  (I'm not saying it is 
>>> necessarily incorrect, just that the explanation does not mention the logic 
>>> change.  The two are not logical opposites, so an implication is that the 
>>> original gate of POSIX is not really the right one.) 
>> This is an import from FreeBSD. To me this looks like FreeBSD forgot to 
>> update the Termios headers to use the visibility defines.
>> https://lists.freebsd.org/pipermail/freebsd-hackers/2017-May/051069.html
> I changed this in FreeBSD:
> https://svnweb.freebsd.org/base?view=revision&revision=318780
> I will send a v2 of the patch set for Newlib.
Yaakov agreed with BSD as the gate, and I also independently found a source 
which says VEOL2, VWERASE, etc. are BSD extensions; __BSD_VISIBLE is good.

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