🚀 go-pugleaf

In article <ldon82INN7j@exodus.Eng.Sun.COM> linden@positive.Eng.Sun.COM (Peter van der Linden) writes:
>Section 2.1.1.3 of the ANSI C standard sayeth:
>       "A conforming implementation shall produce [a] ... diagnostic message
>        ... for every translation unit that contains a violation of any syntax
>        rule or constraint.   Diagnostic messages need not be produced in 
>        other circumstances."
>
>By "syntax rule or constraint", is the standard referring only to the
>information contained in its paragraphs headed "Syntax" and "Constraints"?

Yes.  This involves case-insensitive, quantity-insensitive, comparisons of
"syntax" vs. "Syntax" and "constraint" vs. "Constraints"  :-)

>So, for example, if a program violates something specified only in a 
>paragraph headed "Implementation limits" or "Semantics", a conforming 
>implementation is not *obliged* to emit a diagnostic message?

True again, it is not obliged.

Now for your other question:
>Subject: When a compiler must choke

The answer is never.  If a program violates syntax and/or constraints
(with diagnostic) and/or limits and/or semantics (with or without diagnostic)
the compiler does not have to choke.  It can continue to produce good code
(if there exists some meaningful good code and the compiler wishes to do so),
or bad code such as something that will post true facts to alt.folklore.urban.
--
Norman Diamond       diamond@jit081.enet.dec.com
If this were the company's opinion, I wouldn't be allowed to post it.
"Yeah -- bad wiring.  That was probably it.  Very bad."