Regression: mex command failed to find mingw64 g++ even `MW_MINGW64_LOC` was defined about setup-matlab

[mcafaro]

Looking at some of the changes to the windows-2019 GitHub runner README, it looks like Mingw-w64 was removed from the list of preinstalled software recently: actions/runner-images@2ffd260#diff-816219d3c9f30fcc1c40f88ca826c1662bf99eded781c1b419dd2dfb577ae227L75

That seems like a potential culprit. You may need to install it manually now.

[fangq]

I further confirm this issue by rerunning one of the previously successful jobs without changing anything, yet, the resubmitted job failed with the same error:

here is the failed job log:
https://github.com/fangq/mmc/actions/runs/6356350750/job/18163174446

here is the previous successful job
https://github.com/fangq/mmc/actions/runs/6356350750/attempts/1

no change was made to the code.

[mcafaro]

I would not expect setup-matlab to be involved here. latest switched to R2023b in mid-September and the original successful build was run long after that (Oct 7th), so I would not expect that switch to be involved either.

Have you tried to confirm chocolatey is still installing mingw64 in the same location?

[fangq]

thank you so much for noticing this package change in the log! after installing mingw64 on windows, the issue is gone.

much appreciated!