Date: Tue, 6 May 2003 22:27:56 +0400 From: "Andrey A. Chernov" <ache@nagual.pp.ru> To: Dag-Erling Smorgrav <des@ofug.org> Cc: freebsd-arch@freebsd.org Subject: Re: `Hiding' libc symbols Message-ID: <20030506182756.GA57720@nagual.pp.ru> In-Reply-To: <xzpllxkez78.fsf@flood.ping.uio.no> References: <20030501191027.GA53801@madman.celabo.org> <20030505110601.H53365@beagle.fokus.fraunhofer.de> <20030505175426.GA19352@madman.celabo.org> <xzpk7d53zu5.fsf@flood.ping.uio.no> <20030505205051.GA40572@nagual.pp.ru> <20030505231135.GA21953@madman.celabo.org> <20030505231837.GA44533@nagual.pp.ru> <xzpy91k3j9n.fsf@flood.ping.uio.no> <20030506170823.GI83663@lucky.net> <xzpllxkez78.fsf@flood.ping.uio.no>
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On Tue, May 06, 2003 at 19:56:27 +0200, Dag-Erling Smorgrav wrote: > - If you stayed awake through the previous paragraph you should by > now have concluded that it simply is not possible for the linker to > enforce namespaces like Andrey wants it to, because a) the linker > can't know what headers were included; b) the exact set of reserved > names can vary from compilation unit to compilation unit within the > same application and c) namespace issues affect portions of the > code which are outside the linker's purview (such as the names of > function arguments and static or automatic variables). Namespaces > are a source code issue and cannot be handled anywhere but at the > source code level. There is no problem. Each *.h function prototype can be accompanied with some assembler instruction making it strong reference. The same thing can be conditionalized at the header level using _POSIX_SOURCE or other defines. So, linker will know, what headers are included.
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