[CMake] Removing overkill linking

[Paul McEnery]

Hi.

I'm a cmake newbie, and have only been exposed to cmake in the form of
maintaining a Debian package. I'm working on packaging galinette
(http://galinette.sourceforge.net). I noticed that cmake appears to be
linking against libraries which are not actually required. Here is a
snippet of the dpkg-buildpackage output:

=============================
dpkg-shlibdeps: warning: symbol ftdi_usb_get_strings used by
debian/libgalinette0/usr/lib/libgalinette.so.0 found in none of the
libraries.
dpkg-shlibdeps: warning: symbol ftdi_get_error_string used by
debian/libgalinette0/usr/lib/libgalinette.so.0 found in none of the
libraries.
dpkg-shlibdeps: warning: symbol ftdi_init used by
debian/libgalinette0/usr/lib/libgalinette.so.0 found in none of the
libraries.
dpkg-shlibdeps: warning: symbol ftdi_write_data used by
debian/libgalinette0/usr/lib/libgalinette.so.0 found in none of the
libraries.
dpkg-shlibdeps: warning: symbol ftdi_set_line_property used by
debian/libgalinette0/usr/lib/libgalinette.so.0 found in none of the
libraries.
dpkg-shlibdeps: warning: 4 other similar warnings have been skipped
(use -v to see them all).
dpkg-shlibdeps: warning: dependency on libftdi.so.1 could be avoided
if "debian/galinette-nox/usr/bin/galinette-flash" were not uselessly
linked a
gainst it (they use none of its symbols).
dpkg-shlibdeps: warning: dependency on libfontconfig.so.1 could be
avoided if "debian/galinette/usr/bin/galinette" were not uselessly
linked again
st it (they use none of its symbols).
dpkg-shlibdeps: warning: dependency on libm.so.6 could be avoided if
"debian/galinette/usr/bin/galinette" were not uselessly linked against
it (th
ey use none of its symbols).
dpkg-shlibdeps: warning: dependency on libatk-1.0.so.0 could be
avoided if "debian/galinette/usr/bin/galinette" were not uselessly
linked against it (they use none of its symbols).
dpkg-shlibdeps: warning: dependency on libxml2.so.2 could be avoided
if "debian/galinette/usr/bin/galinette" were not uselessly linked
against it (they use none of its symbols).
dpkg-shlibdeps: warning: dependency on libftdi.so.1 could be avoided
if "debian/galinette/usr/bin/galinette" were not uselessly linked
against it (they use none of its symbols).
dpkg-shlibdeps: warning: dependency on librt.so.1 could be avoided if
"debian/galinette/usr/bin/galinette" were not uselessly linked against
it (they use none of its symbols).
dpkg-shlibdeps: warning: dependency on libpthread.so.0 could be
avoided if "debian/galinette/usr/bin/galinette" were not uselessly
linked against it (they use none of its symbols).
dpkg-shlibdeps: warning: dependency on libgio-2.0.so.0 could be
avoided if "debian/galinette/usr/bin/galinette" were not uselessly
linked against it (they use none of its symbols).
dpkg-shlibdeps: warning: dependency on libgdk_pixbuf-2.0.so.0 could be
avoided if "debian/galinette/usr/bin/galinette" were not uselessly
linked against it (they use none of its symbols).
=============================

The easiest way to browse the source for both the Debian package, and
galinette is via my github repository:

http://github.com/pmcenery/galinette-debian


I've searched the web, and looked at the cmake documentation, but I
cant see how library linking can be more strictly controlled. If
someone could point me in the right direction, or offer some advice -
it would be much appreciated.

Kind regards,
Paul.