Debug Mode ENH 1/4: Add pretty function

[François Dumont]

Hi

 Â Â Â  Here is the 1st patch of a series to improve Debug Mode feedback.

 Â Â Â  This patch add the content of __PRETTY_FUNCTION__ in the debug 
assertion output.

 Â Â Â  Tested under Linux x86_64.

 Â Â Â  I'll commit tomorrow if not told otherwise.

 Â Â Â  * include/debug/formatter.h (_Error_formatter::_M_function): New.
 Â Â Â  (_Error_formatter(const char*, unsigned int)): Adapt.
 Â Â Â  (_Error_formatter::_M_at): Rename in...
 Â Â Â  (_Error_formatter::_S_at): ...that and adapt.
 Â Â Â  * include/debug/macros.h (_GLIBCXX_DEBUG_VERIFY_AT_F): New.
 Â Â Â  (_GLIBCXX_DEBUG_VERIFY_AT, _GLIBCXX_DEBUG_VERIFY): Adapt.
 Â Â Â  * src/c++11/debug.cc (_Error_formatter::_M_error): Render _M_function
 Â Â Â  when available.

François

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