Windows CI fails with an internal compiler error

[olupton]

Context

The Windows CI jobs are now failing, see for example https://github.com/neuronsimulator/nrn/runs/6585801841#step:6:935 on master:

[ 54%] Building CXX object src/nrniv/CMakeFiles/nrniv_lib.dir/__/oc/parallel.cpp.obj
during GIMPLE pass: pcom
D:/a/nrn/nrn/src/oc/parallel.cpp: In function 'void hoc_parallel_begin()':
D:/a/nrn/nrn/src/oc/parallel.cpp:39:6: internal compiler error: in compute_distributive_range, at tree-data-ref.cc:593
   39 | void hoc_parallel_begin(void) {
      |      ^~~~~~~~~~~~~~~~~~
libbacktrace could not find executable to open
Please submit a full bug report, with preprocessed source (by using -freport-bug).
See <https://github.com/msys2/MINGW-packages/issues> for instructions.

Overview of the CI issue

This CI job was passing the previous day: https://github.com/neuronsimulator/nrn/runs/6575669887

The obvious change is that GCC moved from 11.3.0 to 12.1.0, but I have not checked that this is in fact the problem.

Expected result/behavior

Everything should work...

[olupton]

Error is similar to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102853

[olupton]

Tried to debug this a bit with tmate.io, but it was very unstable. I came across actions/runner-images#5151, which makes me wonder if our setup is doing something unsupported.