I have written some c code that I want to integrate with matlab in the following method https://www.mathworks.com/help/matlab/matlab_external/publish-interface-to-shared-c-library-on-linux.html

1. The first step: Generate Interface on Linux goes well.
2. The second step: Define Missing Constructs is not really necessary, my example is so simple it can do this automatically
3. Build Interface is where I get the problem.

Here is my matlab code:

clc;

clibgen.generateLibraryDefinition(fullfile("testing.h"),...
    "Libraries", fullfile("testing.so"),... 
    "PackageName", "integrationTest",...
    "ReturnCArrays",false,... % treat output as MATLAB arrays
    "Verbose",true)

defineintegrationTest;
summary(defineintegrationTest)
build(defineintegrationTest)

The last line, build(defineintegrationTest) is what throws the error. Here is the full output:

Using g compiler. Generated definition file defineintegrationTest.mlx and data file 'integrationTestData.xml' contain definitions for 1 constructs supported by MATLAB. Build using build(defineintegrationTest).

MATLAB Interface to integrationTest Library

Functions int32 clib.integrationTest.addingNumbers(int32,int32)

Building interface file 'integrationTestInterface.so'. Error using clibgen.internal.buildHelper (line 62) Build failed with error: '/usr/bin/ld: cannot find -lting collect2: error: ld returned 1 exit status '.

Error in clibgen.LibraryDefinition/build (line 1297) clibgen.internal.buildHelper(obj, obj.LibraryInterface, '', directBuild);

Error in myIntegrationTest (line 11) build(defineintegrationTest)

The main part of the error seems to be the cannot find -lting collect2: error: ld returned 1 exit status ' part. I made testing.so using the lines:

g -o testing.o -O3 testing.cpp

g -shared -o testing.so testing.o

My testing examples here are super simple. Here's the cpp file.

#include "testing.h"

int addingNumbers(int a, int b){
    return a   b;
}

And here's the header file

#ifndef TESTING_   /* Include guard */
#define TESTING_

int addingNumbers(int a, int b);

#endif

I also tried to use g to make a shared library with the -lting flag, and got the same error.

g -shared -o testing.so testing.o -lting

Does anyone know what this library is or where I can install it? I have gotten google results that actually return 0 results while looking for things about -lting or libting or matlab ting.

CodePudding user response：

It turns out that you should make the first three letters of your .so file lib. So I changed testing.so to libtesting.so and reran the same steps and it worked. Thank you for your help Cris Luengo, who answered this question.