[issue5287] logging package on IronPython

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

@Victor
IronPython doesn't use Python stack frames, so tracking them and then
constructing the objects on demand would add about a ~10% performance
hit to IronPython. Even when it is done it is likely to be an option
rather than on by default - using _getframe is usually a hack anyway. :-)

@Antoine
Could do that - it would have to trap ValueError. I'd be slightly
worried about it masking other bugs. In previous versions of logging
setting _srcfile to None was *the* mechanism for stopping the use of
_getframe.

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