[CMake] how to use external gnu make library

[kdsfinger at gmail.com]

With the FindGSL.cmake copy to the CMake module dir, Here is my
CMakeLists.txt (with TARGET_LINK_LIBRARIES)

*PROJECT*(test1)*FIND_PACKAGE*(GSL)*ADD_DEFINITIONS*(-Wall -O2)*#list
all source files here**ADD_EXECUTABLE*(test1
main.cpp)*TARGET_LINK_LIBRARIES*(test1 gsl_sf_bessel_j0)

but still got the error

Linking CXX executable test1
/usr/local/bin/cmake -E remove -f test1
c++    -fPIC "CMakeFiles/test1.dir/main.o"   -o test1 -rdynamic
-lgsl_sf_bessel_j0
/usr/bin/ld: cannot find -lgsl_sf_bessel_j0
collect2: ld returned 1 exit status

for the gsl sample program

#include <stdio.h>
#include <gsl/gsl_sf_bessel.h>

int
main (void)
{
  double x = 5.0;
  double y = gsl_sf_bessel_J0 (x);
  printf ("J0(%g) = %.18e\n", x, y);
  return 0;
}

What should I do to make it work? I am using linux so it should work
somehow. Many thanks.

zl2k




On 3/13/06, Jan Woetzel <jw at woetzelweb.de> wrote:
>
> kdsfinger at gmail.com wrote:
>
> > I am trying to use the gnu gsl package in vtk. The gsl is make
> > installed by gnu, not cmake. How can I use the library in my vtk
> > project? I put something like
> > FIND_PACKAGE(GSL)
>
> Does a "FindGSL.cmake" script exist and does cmake find it?
> See the cmake  FIND_PACKAGE help.
>
> As far as I know CMake does not come with a "standard" find script for
> GSL, thus you have to write one yourself .
> The CMake "Modules" directory contains examples.
>
> We already created our own simple GSL find, see teh attached file.
> It is simply based on "gsl-config", actually and works only on Linux.
>
> Jan.
>
> --
>
>   Dipl.-Ing. Jan Woetzel
> --------------------------------------------------
>   Uni Kiel
>   Institut f. Informatik und Praktische Mathematik
>   Hermann-Rodewaldstr. 3  [Raum 310]
>   24098 Kiel/Germany
> --------------------------------------------------
>   Tel    +49-431-880-4477
>   Fax    +49-431-880-4054
>   Privat +49-431-802872
>   Mob.   +49-179-2937346
> --------------------------------------------------
>   Url    www.mip.informatik.uni-kiel.de/~jw
>   Email  jw at mip.informatik.uni-kiel.de
>   Privat jw at WoetzelWeb.de
>
>
>
> ##
> ## Try to find gnu scientific library GSL
> ## (see http://www.gnu.org/software/gsl/)
> ## Once run this will define:
> ##
> ## GSL_FOUND       = system has GSL lib
> ##
> ## GSL_LIBRARIES   = full path to the libraries
> ##    on Unix/Linux with additional linker flags from "gsl-config --libs"
> ##
> ## CMAKE_GSL_CXX_FLAGS  = Unix compiler flags for GSL, essentially
> "`gsl-config --cxxflags`"
> ##
> ## GSL_INCLUDE_DIR      = where to find headers
> ##
> ## GSL_LINK_DIRECTORIES = link directories, useful for rpath on Unix
> ## GSL_EXE_LINKER_FLAGS = rpath on Unix
> ##
> ## Felix Woelk 07/2004
> ## minor corrections Jan Woetzel
> ##
> ## www.mip.informatik.uni-kiel.de
> ## --------------------------------
>
> IF(WIN32)
>   MESSAGE(SEND_ERROR "FindGSL.cmake: gnu scientific library GSL not (yet)
> supported on WIN32")
>
> ELSE(WIN32)
>   IF(UNIX)
>     SET(GSL_CONFIG_PREFER_PATH "$ENV{GSL_HOME}/bin" CACHE STRING
> "preferred path to OpenSG (osg-config)")
>     FIND_PROGRAM(GSL_CONFIG gsl-config
>       ${GSL_CONFIG_PREFER_PATH}
>       /usr/bin/
>       )
>     # MESSAGE("DBG GSL_CONFIG ${GSL_CONFIG}")
>
>     IF (GSL_CONFIG)
>       # set CXXFLAGS to be fed into CXX_FLAGS by the user:
>       SET(GSL_CXX_FLAGS "`${GSL_CONFIG} --cflags`")
>
>       # set INCLUDE_DIRS to prefix+include
>       EXEC_PROGRAM(${GSL_CONFIG}
>         ARGS --prefix
>         OUTPUT_VARIABLE GSL_PREFIX)
>       SET(GSL_INCLUDE_DIR ${GSL_PREFIX}/include CACHE STRING INTERNAL)
>
>       # set link libraries and link flags
>       SET(GSL_LIBRARIES "`${GSL_CONFIG} --libs`")
>
>       ## extract link dirs for rpath
>       EXEC_PROGRAM(${GSL_CONFIG}
>         ARGS --libs
>         OUTPUT_VARIABLE GSL_CONFIG_LIBS )
>
>       ## split off the link dirs (for rpath)
>       ## use regular expression to match wildcard equivalent
> "-L*<endchar>"
>       ## with <endchar> is a space or a semicolon
>       STRING(REGEX MATCHALL "[-][L]([^ ;])+"
>         GSL_LINK_DIRECTORIES_WITH_PREFIX
>         "${GSL_CONFIG_LIBS}" )
>
>         #      MESSAGE("DBG  GSL_LINK_DIRECTORIES_WITH_PREFIX=${GSL_LINK_DIRECTORIES_WITH_PREFIX}")
>
>       ## remove prefix -L because we need the pure directory for
> LINK_DIRECTORIES
>
>       IF (GSL_LINK_DIRECTORIES_WITH_PREFIX)
>         STRING(REGEX REPLACE "[-][L]" "" GSL_LINK_DIRECTORIES
> ${GSL_LINK_DIRECTORIES_WITH_PREFIX} )
>       ENDIF (GSL_LINK_DIRECTORIES_WITH_PREFIX)
>       SET(GSL_EXE_LINKER_FLAGS "-Wl,-rpath,${GSL_LINK_DIRECTORIES}" CACHE
> STRING INTERNAL)
>       #      MESSAGE("DBG  GSL_LINK_DIRECTORIES=${GSL_LINK_DIRECTORIES}")
>       #      MESSAGE("DBG  GSL_EXE_LINKER_FLAGS=${GSL_EXE_LINKER_FLAGS}")
>
>       #      ADD_DEFINITIONS("-DHAVE_GSL")
>       #      SET(GSL_DEFINITIONS "-DHAVE_GSL")
>       MARK_AS_ADVANCED(
>         GSL_CXX_FLAGS
>         GSL_INCLUDE_DIR
>         GSL_LIBRARIES
>         GSL_LINK_DIRECTORIES
>         GSL_DEFINITIONS
>       )
>       MESSAGE(STATUS "Using GSL from ${GSL_PREFIX}")
>
>     ELSE(GSL_CONFIG)
>       MESSAGE("FindGSL.cmake: gsl-config not found. Please set it
> manually. GSL_CONFIG=${GSL_CONFIG}")
>     ENDIF(GSL_CONFIG)
>
>   ENDIF(UNIX)
> ENDIF(WIN32)
>
>
> IF(GSL_LIBRARIES)
>   IF(GSL_INCLUDE_DIR OR GSL_CXX_FLAGS)
>
>     SET(GSL_FOUND 1)
>
>   ENDIF(GSL_INCLUDE_DIR OR GSL_CXX_FLAGS)
> ENDIF(GSL_LIBRARIES)
>
>
>
>
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