How to debug MEX-files in Eclipse compiled with MinGW64 and -g flags in MATLAB R2017a and earlier

How to debug MEX-files in Eclipse compiled with MinGW64 and -g flags in MATLAB R2017a and earlier?

Answer 1

[MathWorks Support Team]

NOTE: These instructions are valid for debugging with MinGW 4.9.2. For newer versions, please refer to the following link:

https://www.mathworks.com/matlabcentral/answers/423263-how-to-debug-mex-files-in-eclipse-mars-compiled-with-mingw64-and-the-g-flag-in-matlab-r2017b-and?s_tid=srchtitle

Follow the steps below to debug a MEX-file compiled with MingGW64 and the -g flag:

1. Start Eclipse and choose a new workspace.

You can download Eclipse from the following link:

https://www.eclipse.org/downloads/packages/release/luna/sr2/eclipse-ide-cc-developers

2. In Eclipse, select the following options:

"File" > "New" > "Project"... and select "General" >"Project"

3. Choose a name for your project and click "Finish".

4. Generate a new text file by choosing:

"File" > "New" > "Other"..." and then "General" > "Untitled Text File"

Enter the following in the text file :

handle SIGSEGV nostop

Then save the file as "gdbinit" in "mexdebug" folder as shown in the figure.

5. Drag the C/C++ source code of your MEX-file into the project. When asked to copy or link, choose "Link to file", so that the source codes stay in their original locations.

6. Then go to:

"Run" -> "Debug Configurations..."

And Select "C/C++ Attach to Application" and select the "New" button.

7. On the "Debugger" tab, enter the location of the file created under 4 as "GDB command file".

8. Click "Debug".

9. Select MATLAB.exe from the list.

10. The debugger will suspend MATLAB. Use "Resume" button to continue running MATLAB.

11. Open the C/C++ code in Eclipse and place a breakpoint.

12. Run the MEX-file in MATLAB.

13. When the breakpoint is hit you will stop in the debugger and you can for example step through the code and inspect variables.