[sane-devel] Build system changes -- please test!

[Henning Meier-Geinitz]

Hi everyone,

I have just committed some changes regarding the Makefiles to the
sane-backends CVS. Please test if sane-backends can still be built and
installed on your system (especially OpenBSD and MacOS X).

Some details about the changes:

The depend target is enabled by default now. This means, that "make"
also calls the "depend" target and therefore makedepend, if it's
available. This is a solution to the problem that e.g. after editing
backend/gt68xx.h you had to touch backend/gt68xx.c to make sure that
"make" rebuilds the backend.

The code that manually creates links in /usr/local/lib/sane/ (e.g.
libsane-dll.so.1 --> libsane.so.1.0.16) is enabled again. This is
necessary at least of OpenBSD. As it doesn't work for MacOS X, it's
disabled there.

libtool automatically creates a link /usr/local/lib/sane/libsane.so
--> libsane-v4l.so. This is bad because if for some reason
/usr/local/lib/sane/ is in ld.so.conf, libsane.so from that directory
(and therefore the v4l backend) and not the correct dll backend from
/usr/local/lib/ will be linked against the frontends. This is the
reason for quite some bug reports in recent years. The typical symptom
is that no scanner is identified. If a video card is available. it's
found even if "v4l" is disabled in dll.conf. The wrong links are now
removed by backend/Makefile.in.

The "make install" target was quite verbose, libtool printed its
10-line-long messages about installed libraries for each backend. This
is only printed once now.

Bye,
  Henning