On 08.03.23 15:55, Paul Richard Thomas via Fortran wrote:
As noted below, rnflow.f90 hangs with the unpatched mainline at -O3 but
runs successfully at -O2.

I can confirm that.

I presume that this is a serious regression since it involves optimization?
Which component should I post it against?

Probably against tree-optimization.  If later analysis determines that
it is something else, people will reassign it.

This one probably calls for bisection.

Regards

        Thomas

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