[Octave-bug-tracker] [bug #65321] C++20 warnings about deprecated uses of volatile variables

[Markus Mützel]

Follow-up Comment #19, bug#65321 (group octave):

Re comment #12:
> I added 'CXXFLAGS=-std=c++20 -g -O2' to my configure command.  It didn't
occur to me to add '-std=c++20' to the compiler command itself.

Adding that flag to `CXXFLAGS` (instead of to `CXX`) could lead to incorrect
configure results for tests that only invoke the preprocessor (but not the
compiler).

That was causing some confusing results for the macOS runners in our CI at
some point in the past.



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