The cpp shipped with Red Hat 7.0, at least on Intel hardware, silently
truncates long (and I mean very long) lines.  This showed up in complaints
from users trying to recompile MLton (our ML compiler).
As a simple test case, consider the C source file

	int
	a(int b)
	{
		int	c;

		c = b + b + b + ... + b;
		return (c);
	}
where you include 100,000 b's (so the line will have 400,004 bytes in it).
If you run this through `gcc -E', the output will only be about 7000 bytes
wide and will end in a `+', the rest having been discarded.

Please note, these lines would be rather ridiculous if generated by hand,
but they are the output of our compiler.  Automatically generated C is
quite common (consider the output of yacc, or lex for instance).
It is a real disaster that not only does cpp fail, but it fails silently,
with no error message and no funny exit status.