[CMake] Better handling of library dependencies for CPack

[Eric Noulard]

2011/4/23 Rosen Diankov <rosen.diankov at gmail.com>:
> Hi Eric,
>
> Thanks for the response. In another email to cmake.org, I sent a
> DebSourcePPA.cmake file that shows what i'm doing to generate deb
> source packages.

Yes I saw that one, this is interesting, may be it could go upstream,
if you want it to go upstream please file a bug report and attach
your most up to date script to the tracker.

We can see if it should be handled as a sort of independent Module
http://www.itk.org/Wiki/CMake:Module_Maintainers
or as a new CPack source generator.

> Your script sets CPACK_DEBIAN_PACKAGE_DEPENDS to "Ubuntu-dep", so I
> was confused how that adds the correct dependencies... what does a
> user have to set?

Sorry about that my example was only for explaining how to do different
things **at cpack time** depending on the distribution ID.
"Ubuntu-dep" is a dummy placeholder.

A useful value should be the usual list of deps you'll find in after:

"Depends:"

is a DSC file, e.g. for "Depends: libc6 (>= 2.1)"
you can do:
set(CPACK_DEBIAN_PACKAGE_DEPENDS "libc6 (>= 2.1)")


Note that you can also specify "Pre-Depends:" using
CPACK_DEBIAN_PACKAGE_PREDEPENDS

Have a look at:

cmake --help-module CPackDeb

you should get an hopefully complete list of var handled by CPackDeb.
If the documentation
(found in CPackDeb.cmake)
is not complete do not hesitate to file a patch.


> I understand that using cpack to create a tar ball for the
> installables in each component is a working option, the dependencies
> can then be added as we talked. However, launchpad (the official build
> farm for ubuntu) does not accept binary deb packages, this means we
> have to send a deb source that builds on their servers for all the
> distributions we support. I think fedora core also asks for the source
> rpms. This is why we went through the trouble of using
> DebSourcePPA.cmake when there are many other options available.

This is a very valuable effort.
The trouble with "source packages" be it deb or rpm is that it has some
overlappinh feature with CPack. However as you said if since some
project request it
we should find a way to build deb (or rpm) src.

Try to seek the mailing list archive concerning "source package" with
CPack and you
will find pro- and cons- the idea.

May be we should re-discuss this in the light of your current remarks.

-- 
Erk
Membre de l'April - « promouvoir et défendre le logiciel libre » -
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