mkversion.c, cfgdefine.c, cfgdefine.h

This is C file that is used to build mkversion program. The mkversion program is used during the initial NuttX build.

When you build NuttX there should be a version file called .version in the top level NuttX directory (See Documentation/NuttXPortingGuide.html). The first time you make NuttX, the top-level makefile will build the mkversion executable from mkversion.c (using Makefile.host). The top-level Makefile will then execute the mkversion program to convert the .version file in the top level directory into include/nuttx/version.h. version.h provides version information that can be included by C files.