Exception thrown with mapserv.exe & PROJ 9.2.1 about mapserver HOT 6 CLOSED

@jmckenna - seems to be similar to the issue at #6630 (comment)
In that case the PROJ exception was a handled exception and the actual issue was elsewhere - as per your "red herring" comment.

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thanks @geographika, yes indeed I agree that this could be a red herring, very similar to that other issue. Closing for now (will reopen when I know the exact issue). I'm close to finding it I feel. Back here in a bit ha.

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@geographika case was about when running under the debugger , whereas here I understand this is in regular usage. The exceptions thrown by c_locale_stod() should be caught by getNumericValue() at https://github.com/OSGeo/PROJ/blob/6d10acffadcaebf819cb1c8742129659de0db633/src/iso19111/io.cpp#L10787 and not be propagated further. The fact that they are propagated would indicate some inconsistency in the way the various components (PROJ and mapserver) are built, but I'm not sure which one. This reminds me of a similar issue @szekerest had with GEOS where GEOS C++ exceptions would reach mapserver (cf #6759 (comment))

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OSGeo/PROJ#3834 should help

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OSGeo/PROJ#3834 should help

Thanks @rouault - this will definitely help with debugging using Visual Studio.

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@rouault thank-you very much for this, I tested that branch and the exceptions through the MSVC debugger are gone. This helps immensely.

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