Re: [PATCH] Allow disabling the build of all of systemd, leaving just udev

Bruce Dubbs <bruce.dubbs@xxxxxxxxx> · Wed, 06 Jun 2012 13:51:05 -0500

William Hubbs wrote:

This is where I want to go once we have the Makefile broken up. This
will also require some work in configure.ac, but I think it will be
worth that because it will give packagers the flexability to build what
they want.

include Makefile-shared.am
if ENABLE_UDEV
include Makefile-udev.am
endif
if ENABLE_TOOLS
include Makefile-tools.am
endif
if ENABLE_SYSTEMD
include Makefile-systemd.am
endif

With this type of setup, ENABLE_SYSTEMD must imply ENABLE_TOOLS and 

ENABLE_UDEV.

The first stage of this will be breaking up Makefile.am and using
includes without condissionals. Once everything builds cleanly in that
setup, we can  do the work in configure.ac and add condissionals to
Makefile.am.

The first thing that will have to be done is to break up 

libsystemd_shared_la_SOURCES in Makefile.am.  That definition combines 

files incompatible with udev-only with files required by udev.  udev needs:

log
label
mkdir
cgroup-util
strv
path-util
conf-files
hashmap
set
exit-status
util
dev-setup

but does not need:

cgroup-show
conf-parser
hwclock
pager
ratelimit
socket-util
spawn-ask-password-agent
spawn-polkit-agent
specifier
utf8
virt
watchdog

Basically all of the above are combined into libsystemd-core.la and that 

needs to be split into two.  I'd just split the first group into 

libudev-core.la.

To link, udev also needs the file in libsystemd_daemon_la_SOURCES 

(sd-daumon) for udevd, but that probably could be removed with some 

appropriate ifdefs in udevd.c.

  -- Bruce
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