Cannot debug Fortran dll in Visual Studio

I have a simple Fortran dll compiled with Intel Fortran Compiler using Visual Studio 2019 IDE. I use a script to load the dll library containing the subroutine and then call that function as such:

program.m

n = 3;
A = rand(n, n);
B = zeros(n, n);

loadlibrary('x64\Debug\CopyArray.dll')
[A2, B2] = calllib('CopyArray', 'CopyArray', A, B, n);

The script executes normally and returns the correct output to Matlab. However, I cannot seem to debug the .dll in order to see what is happening inside the Fortran subroutine. I perform the following steps in order to try to debug the .dll in Visual Studio IDE:

1. I first use "attach to process" to Matlab executable.
2. I then place a breakpoint somewhere inside the Fortran subroutine.
3. I run program.m from Matlab

When doing so, the program is executed without stepping into the Fortran subroutine. Am I missing something ?

Thank you in advance for your help!

Answer 1

[Divyanshu]

Hi Rami,

You can refer the following MATLAB Answer thread, which talks about debugging a function inside C/C++ shared library loaded using 'loadlibrary' function.

However, it is specific for C/C++ and not sure if the same would work for 'Fortran' or not, you can refer the steps mentioned in the answer. Here is the link:

https://www.mathworks.com/matlabcentral/answers/354882-debug-functions-inside-c-c-shared-library-loaded-using-loadlibrary

Hope it helps!