Preprocessor requirements for gperf "K&R" output

[Hrvoje Niksic]

Gperf C output emits a preprocessor safeguard against running on 
non-ASCII character sets.  Although the code is valid ISO C, I'm 
concerned that older preprocessors will not be able to parse it.  For 
example, I remember that the preprocessor that came with Ultrix had 
problems with complex preprocessor expressions.  Incompatibilities like 
that are why older programs prefer to write

#if foo
# if bar
#  if baz
... blah ...
#  endif
# endif
#endif

to the simpler "#if foo && bar && baz" variant.

I propose that in "K&R" output mode the non-ASCII safeguard be removed. 
 Gperf has lived without it for years, and the people who really need 
K&R output (which is not the default anyway) will probably value 
portability more than (this kind of) correctness.

Thanks for your consideration.