[mlpack-git] [mlpack] Log::Fatal should give a backtrace of some sort (#380)

[Ryan Curtin]

You can't use `__FUNCTION__` since it's not standardized by ANSI C.  See this list:

https://docs.freebsd.org/info/cpp/cpp.info.Standard_Predefined.html

That gives you `__LINE__` and `__FILE__`, but that won't really help with a backtrace -- that will simply print the current location in the code (that may still be useful, of course).

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https://github.com/mlpack/mlpack/issues/380#issuecomment-74081159
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