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options.texi (Negative): Explicitly mention that the Negative chain must be circular.

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	* doc/options.texi (Negative): Explicitly mention that the
	Negative chain must be circular.

From-SVN: r172419
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Richard Sandiford 2011-04-14 11:52:17 +00:00 committed by Richard Sandiford
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2011-04-14 Richard Sandiford <rdsandiford@googlemail.com>
* doc/options.texi (Negative): Explicitly mention that the
Negative chain must be circular.
2011-04-14 Nathan Froyd <froydnj@codesourcery.com>
* function.h (block_chainon): Declare.

7
gcc/doc/options.texi
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@ -222,6 +222,13 @@ the option name with the leading ``-'' removed. This chain action will
propagate through the @code{Negative} property of the option to be
turned off.
As a consequence, if you have a group of mutually-exclusive
options, their @code{Negative} properties should form a circular chain.
For example, if options @option{-@var{a}}, @option{-@var{b}} and
@option{-@var{c}} are mutually exclusive, their respective @code{Negative}
properties should be @samp{Negative(@var{b})}, @samp{Negative(@var{c})}
and @samp{Negative(@var{a})}.
@item Joined
@itemx Separate
The option takes a mandatory argument. @code{Joined} indicates