[CMake] for loop won't locate libs

[eial at cs.bgu.ac.il]

On Thu 04 Jun 21:15 2009 Bill Hoffman wrote:
> eial at cs.bgu.ac.il wrote:
> > On Thu 04 Jun 20:31 2009 Bill Hoffman wrote:
> >> eial at cs.bgu.ac.il wrote:
> >>> On Thu 04 Jun 20:16 2009 Tyler Roscoe wrote:
> >>>> On Thu, Jun 04, 2009 at 07:50:08PM +0300, eial at cs.bgu.ac.il wrote:
> >>>>> SET(LIBS AR ARMulti ARvideo)
> >>>>> FOREACH (LIB ${LIBS})
> >>>>>    SET(FOUND_LIB)
> >>>>>    FIND_LIBRARY(LIB_FOUND ${LIB} /usr/lib /usr/local/lib) 
> >>>>>    SET(ARTK_LIBRARY ${ARTK_LIBRARY} ${LIB_FOUND})
> >>>>> ENDFOREACH(LIB)
> >>>>>
> >>>>> the result is /usr/lib64/libAR.a/usr/lib64/libAR.a/usr/lib64/libAR.a when it should be /usr/lib64/libAR.a /usr/lib64/libARMulti.a /usr/lib64/libARvideo.a
> >>>> What's up with set(FOUND_LIB)?
> >>>>
> >>>> You might be running into a quoting/list expansion problem. Try:
> >>>> SET(ARTK_LIBRARY "${ARTK_LIBRARY}" "${LIB_FOUND}")
> >>>>
> >>>> or use list(APPEND ...) instead.
> >>>>
> >>>> tyler
> >>>>
> >>> apparently, FOUND_LIB isn't being cleaned in each loop, that is for cleaning.
> >>> my problem is that the loop finds only the first lib's file but not the rest, look at the output result that I've posted.
> >>>
> >> Look at the docs for FIND_LIBRARY:
> >> http://www.cmake.org/cmake/help/cmake2.6docs.html#command:find_library
> >>
> >>
> >> "A cache entry named by <VAR> is created to store the result of this 
> >> command. If the library is found the result is stored in the variable 
> >> and the search will not be repeated unless the variable is cleared. If 
> >> nothing is found, the result will be <VAR>-NOTFOUND, and the search will 
> >> be attempted again the next time find_library is invoked with the same 
> >> variable."
> >>
> >> -Bill
> >>
> > ${FOUND_LIB-NOTFOUND} is empty in every iteration
> > 
> > 
> Sure, because it is FOUND...   Once it finds it it does not look for it 
> again.  If not CMake would try to find stuff every time it runs.  As the 
> above paragraph says: "search will not be repeated unless the variable 
> is cleared"
> 
> So, you either need to do a cache force to clear it, or you need to use 
> a different variable for each find_library.
> 
> -Bill
> 
ok, I've understand the problem, I'm trying to clear the var using SET(FOUND_LIB) but it doesn't seem to work, how can I clear the variable?