Re: lib/58674: HEAD fails to build tools on recent Linux (Fedora 40)

["Robert Elz via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR lib/58674; it has been noted by GNATS.

From: Robert Elz <kre%munnari.OZ.AU@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: lib/58674: HEAD fails to build tools on recent Linux (Fedora 40)
Date: Tue, 17 Sep 2024 20:52:16 +0700

     Date:        Tue, 17 Sep 2024 00:20:00 +0000 (UTC)
     From:        david%gutteridge.ca@localhost
     Message-ID:  <20240917002000.AD1831A9244%mollari.NetBSD.org@localhost>
 
   | So, on NetBSD the idea is those various defines are required
   | universally, but on Linux "the program ... should do that". Which is it?
 
 Strictly, all programs should say what standard(s) they are being
 written for, and so which the compiler should apply.
 
 However, for normal NetBSD applications we simply set __NetBSD_SOURCE__
 and allow everything conceivable to be visible (and so used), and then
 make sure the code doesn't use anything that exposes in incompatible ways.
 
 The #ifdef __NetBSD__ section you showed is attempting to undo that for
 tools builds, so we can (hopefully) catch things in the tools build before
 they get to foreign systems ... but our headers aren't all perfect in
 what they actually expose, when __NetBSD_SOURCE__ isn't defined.
 
 kre