[pph/libcpp] Allow include callback to not read the file (issue4388057)

[Diego Novillo]

On Wed, Apr 13, 2011 at 12:21, Tom Tromey <tromey@redhat.com> wrote:
>>>>>> "Diego" == Diego Novillo <dnovillo@google.com> writes:
>
> Lawrence> This change is not source compatible with existing code using
> Lawrence> the callbacks (which may not be in the gcc svn).  Perhaps a new
> Lawrence> callback is needed?
>
> Diego> Well, it only changes the return value for the callback.  Existing
> Diego> users do not really need to be changed.
>
> Diego> I don't think we want a new callback.  The callback would do exactly
> Diego> what cb.include does.
>
> My grep shows 2 places that set this: c-family/c-ppoutput.c and
> fortran/cpp.c.  It seems like it would be simple to just update those
> two functions to account for the type change.

Oh, right.  Here I was thinking of users outside of gcc, but of course
there aren't those.  I'll fix the calls in the existing front ends.


Diego.