dbus-daemon link process ...

frederic heem frederic.heem at telsey.it
Fri Nov 3 02:21:43 PST 2006

On Friday 03 November 2006 10:42 am, 10function wrote:
> Hello dbus users and gurus !
> I was just asking myself why the 'dbus-daemon' is not dynamically linked
> with 'libdbus' low-level library as shown :
> $ldd dbus-daemon
>         libexpat.so.1 => /usr/lib/libexpat.so.1 (0x4001c000)
>         libc.so.6 => /lib/tls/libc.so.6 (0x4003c000)
>         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
> The link process is done as follows on my platform :
> gcc -g -O2 -Wall -Wchar-subscripts -Wmissing-declarations
> -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wcast-align
> -Wfloat-equal -Wsign-compare -Wdeclaration-after-statement -fno-common
> -fPIC -o dbus-daemon activation.o bus.o config-parser.o connection.o
> desktop-file.o dir-watch-dnotify.o dispatch.o driver.o expirelist.o
> policy.o selinux.o services.o signals.o test.o utils.o
> config-loader-expat.o main.o  /usr/lib/libexpat.so
> ../dbus/.libs/libdbus-convenience.a
> It seems that "libdbus-convenience.a" contains all exported symbols of
> libdbus + some internal ones (_dbus_... ) that are usefull for the daemon
> and this static link replace the dynamic one with libdbus. Well, ok that
> works and it's not a big deal on common platforms 
but it becomes a bit
> annoying if you plan to port DBUS to an embedded device because of the disk
> space loss due to (duplicate) size of dbus-daemon + libdbus ...
> For giving an idea, i have done a quick build of a "minimalistic" DBUS
> environment (no asserts,no checks,no options , stripped 
) dbus-daemon is
> about 650Kb
> libdbus is about 255Kb
> libexpat is about 160Kb
> ==> All of this takes about 1Mb which is quite a lot for an embedded
> device.
> What do you think of linking dynamically the dbus-daemon with libdbus ? May
> be this will help DBUS to play in the embedded field 
> On the other hand, may be you have ideas on how to reduce build size 

> Please let me know .
What about a configure option to disable authentication ? On embedded system, 
it doesn't make sense to use authentication since all users are known in 
Frederic Heem
>  Hope this helps. Thanks for all your good work.
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