>>>>> "Tom" == Tom Lord <[EMAIL PROTECTED]> writes:
Tom> Is there anything known to be non-portable about this technique
Tom> for generating a list of all included files?
Yes.
Tom> cc [-I options] -E <source-file>
Tom> | sed -e '{
Tom> /^#[[:space:]]\{1,\}[[:digit:]]\{1,\}[[:space:]]\{1,\}"/!d
I think `:space:' and the like aren't portable.
Beyond that, I think `#' and `#line' are common on Unix but not
elsewhere. Even on Unix there is some confusion; there is a recent
thread on one of the gcc lists about how these lines should be quoted
on Windows boxes (where `\' is the directory separator).
Tom> I noticed that depcomp uses something similar for some compilers,
Tom> but not others.
It is a fallback because it is a bit unreliable -- or, more precisely,
isn't known to be reliable, whereas something like using `-M' on a
known compiler is known to be reliable. Also, for compilers that can
generate dependencies as a side effect, doing so is a performance
improvement as we don't have to preprocess twice.
Tom
