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   its own namespace. Assertions seem to be used in several places,
   therefore ucpp knows about them. It is recommended to enable
   assertions by default on Solaris systems.
-- Unicode: the C99 norm specifies that extended characters, from
   the ISO-10646 charset (aka "unicode") can be used in identifiers
   with the notations \u and \U. ucpp also accepts (with the proper
   flag) the UTF-8 encoding in the source file for such characters.
-- #include_next directive: it works as a #include, but will look
   for files only in the directories specified in the include path
   after the one the current file was found. This is a GNU-ism that
   is useful for writing transparent wrappers around header files.

Assertions and unicode are activated by specific flags; the #include_next
support is always active.

The ucpp code itself should be compatible with any ISO-C90 compiler.
The cpp.c file is rather big (~ 64kB), it might confuse old 16-bit C
compilers; the macro.c file is somewhat large also (~ 47kB).

The evaluation of #if expressions is subject to some subtleties, see the
section "cross-compilation".