The C/C++ preprocessor defines and expands macros and processes '#if',
'#include', and some other directives.

MCPP is an alternative C/C++ preprocessor with the highest conformance
to standards. It supports multiple standards: K&R, ISO C90, ISO C99, and
ISO C++98. MCPP is especially useful for debugging a source program which uses
complicated macros and also useful for checking portability of a source file.

Although mcpp could be built as a replacement of GCC's resident
preprocessor, or as a stand-alone program without using the library build of
mcpp, this package only installs a program named 'mcpp' which links
to the shared library of mcpp and does not run as part of GCC.