devel/nana 2.5_2 DragonFly

Nana provides improved support for assertion checking and logging in C, C++ using GDB. In particular it provides:

o Operations can be implemented directly in C or by generating
  debugger commands which do the checking and logging only if the
  application is run under the debugger. The debugger based calls
  require are very space efficient (0 or 1 bytes per call).
o Support for checking real time constraints.
o Support for assertion (invariant checking) including:
	+ Space and time efficient (at least versus <assert.h>)
	  For example: assert(i>=0) uses 53 bytes on a i386 vs
	  an optimised nana call which uses 10 bytes per call.
	+ Checking can be turned on or off at compile or run time.
	+ The action taken when an error is detected can be modified
	  on a global and per/call basis.
o Support for logging (printf style debugging) including:
	+ Logging can be turned on and off at compile or run time.
	+ Logging to files, processes or circular buffers in memory
	  with optional time stamping.
o Support for the quantifiers of predicate calculus (forall, exists).
o Support for before and after state saving and checking (x, x').