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From: Vladimir V <vv.os.swe@gmail.com>
Date: Mon, 8 Feb 2021 13:58:30 +0100
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Subject: Re: Problem building libstdc++ for the avr target
To: Keith Packard <keithp@keithp.com>
Cc: Jonathan Wakely <jwakely@redhat.com>, libstdc++@gcc.gnu.org
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It should be available in installation in bits/c++config.h.


=D0=BF=D0=BD, 8 =D1=84=D0=B5=D0=B2=D1=80. 2021 =D0=B3. =D0=B2 00:06, Keith =
Packard <keithp@keithp.com>:

> Vladimir V <vv.os.swe@gmail.com> writes:
>
> > But If the GNU C++ standard library extensions where stdio_sync_filebuf
> > belongs
> > supports non-posix targets then maybe <unistd.h> include should be
> > moved inside  _GLIBCXX_HAVE_UNISTD_H guard?
> > This should provide backward compatibility.
>
> I thought about using a #ifdef guard, but that relies on that definition
> being available when building applications using the header file, and I
> don't whether the definition is only available while building libstdc++
> or is also available when building applications using libstdc++
>
>
> --
> -keith
>