Re: Mention _XOPEN_SOURCE_EXTENDED in curs_addwstr.3

On Fri, Sep 09, 2022 at 07:42:18PM +0200, Anders Andersson wrote:
> On Wed, Sep 7, 2022 at 9:02 PM Grigory Kirillov <txgk@bk.ru> wrote:
> >
> > Recently one OpenBSD user of little project of mine got caught up in
> > a problem - they couldn't compile it from source because wide character
> > functions of the ncurses library weren't declared. After a long
> > investigation I finally found out that these functions require
> > _XOPEN_SOURCE_EXTENDED macro being defined. On my machine that wasn't
> > a problem because on my Linux system ncurses header also checks for
> > _XOPEN_SOURCE macro which value has to be greater than or equal to 500
> > and I was already compiling it with this macro with a value of 700.
> >
> > My request here is to put up a `#define _XOPEN_SOURCE_EXTENDED` line to
> > the OpenBSD man page for curs_addwstr.3 I think this will make it
> > easier for other people to compile ncurses with wide character functions
> > especially for someone who's trying to resolve issues for someone else
> > while being on a different system...
> >
> > Also it would be cool if ncurses header provided in OpenBSD were
> > checking value of the _XOPEN_SOURCE macro (because
> > _XOPEN_SOURCE_EXTENDED is equal to _XOPEN_SOURCE with the value of 500
> > or greater (according to my feature_test_macros(7) man page) and I also
> > hope that this is a standard behavior).
>
> From what I can see, this macro is obsolete, so it should probably not
> be recommended in the man page:
>
> "Use of _XOPEN_SOURCE_EXTENDED in new source code should be avoided.
> Since defining _XOPEN_SOURCE with a value of 500 or more has the same
> effect as defining _XOPEN_SOURCE_EXTENDED, the latter (obsolete)
> feature test macro is generally not described in the SYNOPSIS in man
> pages."
>

Okay, then I hope someone kindly adds an ifdef with the _XOPEN_SOURCE
macro to the wide character function declarations in ncurses header.
I think it's also worth adding a note to the curs_addwstr.3 man page
about the need to declare the corresponding macro. Thanks!