topic Re: debugging not working in Intel® Fortran Compiler

debugging not working

dqian — Wed, 15 Apr 2026 21:18:05 GMT

I am debugging a big FORTRAN code inside Visual Studio 2022. I have defined lots of structures with the elements of single variables as well as multidimensional arrays. When I debug the code and Add Watch the Structures, it shows values of the single variables, but says "<unable to read memory>".

On another computer, it cannot even display any of the variables on Add Watch.

Re: debugging not working

witwald — Wed, 15 Apr 2026 21:49:01 GMT

At the very least, can you supply a small snippet of your code where the problem is occurring? Otherwise we are sort of flying blind here. Ideally, if you would kindly provide a small self-contained program that demonstrates the issue, that would be very helpful. Maybe even a screenshot or two?

Re: debugging not working

dqian — Thu, 23 Apr 2026 21:07:48 GMT

I know this is a known debugger integration issue between Intel oneAPI Fortran (IFX/IFORT) and Visual Studio, specifically affecting arrays inside derived types (Fortran structures) in the Watch / Locals windows. The code is correct—the debugger is the problem.

I have already tried these steps:

Open Visual Studio
Go to Extensions → Manage Extensions
Search for “Fortran Expression Evaluator”
Install (or update) Intel Corporation – Fortran Expression Evaluator
Restart Visual Studio

But it does not help.