Gnu nana is a library that provides improved support for assertion checking, logging, and performance measurement in c/c++, when compared with the standard assert.h mechanism. avoid maintaining a source version without assertions and logging for production use or using non-standard macros.

- space/time efficient assertion checking.
- space/time efficient program logging to file, console, process,
or circular buffer in memory.
- selectively enable and disable assertion checking and logging both at
compile and run time. configure action following assertion failure.
- logging via inline c code (as in ) or by extraction of
commands for gdb which results in no performance cost unless
running in the debugger.
- statement and function-level source tracing under gdb.
- code-to-html converter giving only details of your interface and
pre/postconditions (similar to eiffel short form).
- official gnu package.