A question of style and design

[high_flyer]

but I wonder if this counts as bad design.

I would not go as far as calling it bad design.
You can add the following, which should apease both compilers:

deefalut: assert(false);
                return 0.0; //or -1.0 or what have you that means error

deefalut: assert(false);
                return 0.0; //or -1.0 or what have you that means error

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