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From: dik@cwi.nl (Dik T. Winter)
Newsgroups: comp.lang.fortran,comp.unix.cray
Subject: Re: CPP "problems" (was Re: why has Cray dropped CPP support from cf77?)
Message-ID: <2960@charon.cwi.nl>
Date: 19 Feb 91 11:38:13 GMT
References: <1298@red8.qtp.ufl.edu> <1991Feb18.145116.3840@convex.com> <1300@red8.qtp.ufl.edu>
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In article <1300@red8.qtp.ufl.edu> bernhold@qtp.ufl.edu (David E. Bernholdt) writes:
 > It is worth noting that this difference in blank significance is only
 > relevant when using the macro substitution capabilities of CPP -- the
 > include and conditional compilation features are all given with lines
 > beginning '#' as their first non-blank character.
That is not the only possible problem.  CPP is allowed to remove leading
white space from a line.  There is at least one CPP around that does that
occasionally.  Other problems that might occur are with quotes (both single
and double).  ANSI C preprocessors *must* look at them as starting string/
character constants, disallowing preprocessing within them.  (But this is
of course only a problem if you are using hollerith constants.)
--
dik t. winter, cwi, amsterdam, nederland
dik@cwi.nl