Public Comment Number PC-UK0005

ISO/IEC CD 9899 (SC22N2620) Public Comment

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

Date: 1997-12-25
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: Normative change to existing feature retaining the original intent
Committee Draft subsection: 3.18, 6.8.5

Title: Make #error have the desired effect

Detailed description:

Consider the program:
    #error foo
    int main(void) { return 0; }

This does not violate any of 3.18p3:

    The implementation must successfully translate a given program unless
    a syntax error is detected, a constraint is violated, or it can
    determine that every possible execution of that program would result
    in undefined behavior.

but clearly ought to. A reasonable way to fix this is to add to the end of
3.18p3:

    The implementation must not successfully translate a program that
    contains a #error preprocessing directive that is not part of a
    group that is skipped by conditional inclusion.