[CMake] Need help using libraries in non-standard locations

[Guido W.]

Hi,

I'm trying to write a CMakeLists.txt for a small program that needs to use the 
Sybase client libraries. These libraries are often in different locations, on 
my system they are in /opt/sybase/ase/OCS-15_0/lib. So, my first thought was 
to write something like this:

[...]
ADD_LIBRARY (dbconns SHARED ${DBCONNS_SRC})
FIND_LIBRARY (SYBLIB15 NAMES sybct PATHS 
$ENV{SYBASE}/$ENV{SYBASE_OCS} /opt/sybase/OCS-15_0 /opt/sybase/ase/OCS-15_0 
PATH_SUFFIXES /lib)
IF(NOT SYBLIB15)
	MESSAGE (FATAL_ERROR "Sybase libraries not found")
MESSAGE ("Sybase libraries found in ${SYBLIB15}")
LINK_DIRECTORIES (${SYBLIB15})
TARGET_LINK_LIBRARIES (dbconns sybtcl sybintl sybcomn sybct sybcs)
[...]

This didn't work. The output from that MESSAGE command was:

Sybase libraries found in /opt/sybase/ase/OCS-15_0/lib/libsybct.so

So, the output from FIND_LIBRARY was the complete path to the file I told it 
to look for and not, as I was expecting, just the directory in which the file 
was found. (BTW, why is that so? What am I to do with that output anyway? I 
can't use it for either LINK_DIRECTORIES or TARGET_LINK_LIBRARIES...)

Anyway, I went on to do something like this instead:

[...]
FIND_PATH (SYB15_LIBDIR libsybct.so PATHS 
$ENV{SYBASE}/$ENV{SYBASE_OCS}/lib /opt/sybase/OCS-15_0/lib /opt/sybase/ase/OCS-15_0/lib)
MESSAGE ("Sybase libraries found in ${SYB15_LIBDIR}")
[...]
LINK_DIRECTORIES (${SYB15_LIBDIR})
[...]

Okay, so this obviously sucks, because it's not portable and doesn't work with 
static libraries.
Also, it _still_ doesn't work - the compiler can't find the library when 
linking.
This is how the linker commandline looks like when running make VERBOSE=1:

/usr/bin/c++  -fPIC    -shared -Wl,-soname,libdbconns.so -o libdbconns.so \ 
"CMakeFiles/dbconns.dir/dbconn.o" "CMakeFiles/dbconns.dir/dbconnfactory.o" \ 
"CMakeFiles/dbconns.dir/dbconnpg.o" "CMakeFiles/dbconns.dir/dbconnsyb.o" \ 
-lsybtcl -lsybintl -lsybcomn -lsybct -lsybcs
/usr/lib/gcc-lib/i586-suse-linux/3.3.5/../../../../i586-suse-linux/bin/ld: \ 
cannot find -lsybtcl
collect2: ld returned 1 exit status

There is no -L or -Wl,-R anywhere in there. It looks like cmake is just 
ignoring the LINK_DIRECTORIES command...

Can anyone help me with this?

	Guido W.