For the records, here is the post by Francois reporting the regression:

I'm trying to run the Tk test suite with the tip of core-8-6-branch in both Tcl and Tk repositories.

Observation: tktest.exe crashes because it fails in loading the tcl86tg.dll

This happens all with the tip of core-8-6-branch of Tk, i.e.:


It crashes with the tip of Tcl core-8-6-branch, that is with:


but this same tktest.exe does not crash when trying to load the Tcl dll built from the commit just before in the Tcl repository, i.e. with:


Looking at the apparently faulty commit [9d24a1b9db1ebb45] I have no idea about the reason for this failure to load the Tcl dll.

Is anyone seeing the cause perhaps?