Date: Fri, 24 Apr 2015 13:57:51 -0500 From: Bryan Drewery <bdrewery@FreeBSD.org> To: Baptiste Daroussin <bapt@FreeBSD.org>, arch@FreeBSD.org Subject: Re: RFC: Alternative to PRIVATELIB Message-ID: <553A922F.3000303@FreeBSD.org> In-Reply-To: <20150411142835.GE65320@ivaldir.etoilebsd.net> References: <20150411142835.GE65320@ivaldir.etoilebsd.net>
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On 4/11/2015 9:28 AM, Baptiste Daroussin wrote:
> Hi,
>=20
> I would like to propose to replace PRIVATELIB with something more conve=
nient.
>=20
> First what is PRIVATELIB is trying to solve:
> We are maintaining stable ABI over branches but some third parties sour=
ces
> are not really good at maintaining stable ABI, so we do hide them into =
private
> where nothing can use it. We do not provide headers for that and we add=
rpath to
> every binaries that needs to link to those.
>=20
> What is the issues of PRIVATELIB:
> any application linking to a library from base (a regular one) that doe=
s itself
> links to a PRIVATELIB cannot anymore statically link to the said applic=
ation.
>=20
> The is no mechanism to handle PRIVATELIBS in compat*x ports which can b=
e a
> problem if one of our regular lib is linked to a privatelib and ends up=
into
> compat one day.
>=20
> It prevents easy linking for 3rd party application using those privatel=
ibs on
> purpose (aka with the knowledge abi can break) like libbsdstat.
>=20
> What I would like to propose is the following:
>=20
> Create in bsd.lib.mk support for PRIVATE knobs (what ever name you do p=
refer)
>=20
> It will just prefix the name of the library with "private" but install =
it in the
> regular place
>=20
> It will automatically decide to install the headers into /usr/include/p=
rivate/${LIB}/
This is basically a requirement to even make some libraries private. (I
may be misremembering details) Anything built against readline wants to
find a readline/*.h but the source in the tree is not stored in a
readline/*.h structure. By installing the actual headers into
/usr/include/private the problem goes away.
> Each private library headers in a custom place to avoid an application =
that
> deliberatly use a given privatelib to find another one
>=20
> Prefix all manpage with private_ so that we can provide the documentati=
on for
> the said libs for the version we ship but if another version is shipped=
by ports
> then we can easily access both documentation.
>=20
This sounds useful for debugging and developing base applications which
need these private libs.
> As a result bsd.lib.mk will be simpler, we could again static link agai=
nst
> everything we ship in base, we can provide documentation for those libs=
and we
> can easily isolate them anyway from the ports.
>=20
> I plan to start working on this in a week.
>=20
+1
--=20
Regards,
Bryan Drewery
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