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external calls - Error loading shared library libML64i3.so


I'm trying to call Mathematica from C. I'm following the example https://mathematica.stackexchange.com/a/32864/14301 with http://reference.wolfram.com/mathematica/tutorial/MathLinkDeveloperGuide-Unix.html#725481284


The code I have is: mlcall.c (identical to what i linked)


#include 
#include 


int main(int argc, char *argv[]) {
    MLENV env;
    MLINK link;
    int errno;
    int packet;

    env = MLInitialize(0);

    /* consider using MLOpenString instead here: */    


    link = MLOpenArgcArgv(env, argc, argv, &errno);

    MLActivate(link);

    /* send 42+137 using the full form Plus[42, 137] */
    MLPutFunction(link, "Plus", 2);
    MLPutInteger(link, 42);
    MLPutInteger(link, 137);
    MLEndPacket(link);


    /* get packets until we find a ReturnPacket or error */
    while ((packet = MLNextPacket(link)) && packet != RETURNPKT)
        MLNewPacket(link);

    if (MLError(link))
        printf("error.\n");
    else {
        int result;
        MLGetInteger(link, &result); /* we know that the result is an integer in this case */

        printf("result: %d\n", result);
    }

    return 0;
}

and makefile:


MLINKDIR = /opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit
SYS=Linux-x86-64
CADDSDIR = ${MLINKDIR}/${SYS}/CompilerAdditions


INCDIR = ${CADDSDIR}
LIBDIR = ${CADDSDIR}

MLLIB = ML64i3

EXTRALIBS = -lm -lpthread -lrt -lstdc++ # Set these with appropriate libs for your system.

mlcall: mlcall.c
    $(CC) -O mlcall.c -I$(INCDIR) -L$(LIBDIR) -l${MLLIB} ${EXTRALIBS} -o $@


clean:
    rm mlcall

Output of make is:


cc -O mlcall.c -I/opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions -L/opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions -lML64i3 -lm -lpthread -lrt -lstdc++  -o mlcall

So no errors, but when I try to run mlcall with either ./mlcall or ./mlcall -linkmode launch -linkname "/usr/bin/MathKernel" I get the following error:


./mlcall: error while loading shared libraries: libML64i3.so: cannot open shared object file: No such file or directory


I do have libML64i3.so in the directory /opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions -L/opt/Mathematica-9.0/SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions and I also tried to copy it to the directory I was running mlcall in. What should I do?



Answer



On Linux you can add the directory containing this library to LD_LIBRARY_PATH.


A semi-automated way to do this from a command prompt is this:


MATHLINK=$(dirname $(readlink -f $(which math)))/../SystemFiles/Links/MathLink/DeveloperKit/Linux-x86-64/CompilerAdditions

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$MATHLINK

You can use this merthod of detecting the location in a shell script that will start your program.


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