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Next: <a href="Return-Value.html#Return-Value" accesskey="n" rel="next">Return Value</a>, Previous: <a href="Options-for-val.html#Options-for-val" accesskey="p" rel="previous">Options for val</a>, Up: <a href="val.html#val" accesskey="u" rel="up">val</a> [<a href="Concept-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Validation-Warnings-1"></a>
<h4 class="subsection">3.15.2 Validation Warnings</h4>
<p>Some possible problems with <small>SCCS</small> files are not definitively
errors. In these situations, <code>val</code> will emit a warning message
but the validation will not fail (that is, if there are no other
problems the return value will be zero). An explanation of the
possible warnings appears below.
</p>
<dl compact="compact">
<dt>WARNING: date for version 1.1 is later than the date for version 1.2</dt>
<dd><p>This message indicates that a delta exists in the history file where
the “parent” delta has a delta creation time which is later than the
creation time of the “child” delta. This is a warning only because the
delta creation time is measured in local time, and so if two
developers with different time locale settings both edit the file in a
short period of time, this can happen. If all the developers who
create deltas in a history file use the same timezone settings, this
should not happen.
</p>
<a name="index-time-travel-1"></a>
<p>Some versions of <small>SCCS</small>, but not <small>CSSC</small> exhibit a peculiar
behaviour in these circumstances, and do not include in the gotten
file any lines apparently inserted after the date of the delta which
has been selected. This applies to <code>get</code> but more importantly
also applies to the temporary file generated by <small>DELTA</small> which is
compared with the working copy of tyhe file. Once this has happened
there is no way to recover from this problem other than to hand-edit
the <small>SCCS</small> file.
</p>
</dd>
<dt>Unknown special comment intro</dt>
<dd><a name="index-BitKeeper-2"></a>
<p>This message is displayed when a “c” control line is seen in the
body of the <small>SCCS</small> file in which the initial “c” is not followed
immediately by a space. Lines of this type are used as an extension
mechanism by some other SCCS implementations, notably the
<em>BitKeeper</em> suite, and <small>CSSC</small> knows about this, but if it sees
a construction it doesn’t recognise, this warning is issued.
</p>
</dd>
<dt>The ’y’ flag specifies a keyword letter ’X’ but %X% is not a recognised SCCS keyword</dt>
<dd><a name="index-Keyword-Substitution-8"></a>
<p>This message is displayed when the ‘<samp>y</samp>’ flag of the <small>SCCS</small> file
is set to a value which includes a keyword letter which is not known.
This is harmless unless you intended to set the flag to some other value.
<a href="Flags.html#Flags">Flags</a>.
</p>
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