Public Comment Number PC-UK0047

ISO/IEC CD 9899 (SC22N2620) Public Comment

=========================================== 

Date: 1998-01-14
Author: Clive D.W. Feather
Author Affiliation: Self
Postal Address:
    Demon Internet Limited
    322 Regents Park Road
    London
    N3  2QQ
    United Kingdom
E-mail Address: <clive@demon.net>
Telephone Number: +44 181 371 1138
Fax Number:       +44 181 371 1037
Number of individual comments: 1


Comment 1. 
Category: Request for information/clarification
Committee Draft subsection: 6.8

Title: Handling of unknown preprocessing directives

Detailed description:

In the preprocessing phase (translation phase 4), consider the line:

    # unknown command

It is unclear whether or not this requires a diagnostic. Presumably the
# punctuator will remain until translation phase 7 where it cannot fit in
the syntax, but even if so, this is less than clear. However, this is
easy to fix. In the syntax in 6.8p1, change group-part to:

    group-part:
        non-directive new-line
        if-section
        control-line

and add:

    non-directive:
        pp-tokens/opt

Then add a constraints clause:

    Constraint

    The first preprocessing-token (if any) in a non-directive shall not
    be /#/.

Finally, delete 6.8.3p8, because this can no longer occur.