[Users] linking error Wave Toy Demo

[Tijmen]

Thank you! Compiling and linking works perfectly now. For future
generations, this is the exact config file I used:

MPI = CUSTOM
MPI_LIBS     = mpi lam pthread util dl
MPI_LIB_DIRS = /opt/lam-mpibase/lib
MPI_INC_DIRS = /opt/lam-mpibase/include

(Note the missing apostrophes around the mpi libs).

On 1/4/07, Thomas Radke <tradke at aei.mpg.de> wrote:
> Tijmen wrote:
> > Hello,
> >
> > I am trying to compile the MPI Wave Toy Demo from
> > http://www.cactuscode.org/WaveToyDemo/ on a cluster of workstations
> > that has MPI/LAM installed. Everything compiles perfectly, but when
> > its linked, I get the following error:
> >
> > Creating cactus_WaveDemo in /home/nw/tpcollig/Work/Cactus/exe from
> > CactusBase/Boundary CactusBase/CartGrid3D CactusBase/CoordBase
> > CactusConnect/HTTPD CactusConnect/HTTPDExtra CactusWave/IDScalarWaveC
> > CactusBase/IOASCII CactusBase/IOBasic CactusIO/IOJpeg
> > CactusBase/IOUtil CactusPUGHIO/IsoSurfacer CactusBase/LocalReduce
> > CactusPUGH/PUGH CactusPUGH/PUGHReduce CactusPUGH/PUGHSlab
> > CactusConnect/Socket CactusBase/SymBase CactusBase/Time
> > CactusWave/WaveBinarySource CactusWave/WaveToyC CactusExternal/jpeg6b
> > /opt/lam-mpibase/lib/liblam.a(ltdl.o)(.text+0x3b5): In function `sys_dl_open':
> > : undefined reference to `dlopen'
> > /opt/lam-mpibase/lib/liblam.a(ltdl.o)(.text+0x3d5): In function `sys_dl_open':
> > : undefined reference to `dlerror'
> >
> > <snipped some more similar errors>
> >
> > collect2: ld returned 1 exit status
> >
> > My ~/.cactus/config file contains:
> >
> > MPI = LAM
> > LAM_DIR = /opt/lam-mpibase
>
> It's your LAM MPI library which itself requires libdl.
>
> Cactus tries to determine what other libraries LAM depends on by looking
> into $LAM_DIR/include/lam_config.h and checking for the setting of
> WRAPPER_EXTRA_LIBS. If the libdl library isn't mentioned there, Cactus
> doesn't include it in the liblist.
>
> You can either fix the LAM config header by adding '-ldl' to
> WRAPPER_EXTRA_LIBS or - if you aren't allowed to modify your LAM
> installation - tell Cactus explicitely your MPI settings, eg.
>
>    MPI          = CUSTOM
>    MPI_LIB_DIRS = $LAM_DIR/lib
>    MPI_INC_DIRS = $LAM_DIR/include
>    MPI_LIBS     = 'mpi lam pthread util dl'
>
> --
> Cheers, Thomas.
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