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Add explanation of property validity

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[SVN r16475]
This commit is contained in:
Dave Abrahams
2002-12-02 14:13:52 +00:00
parent 3e0338e973
commit 8845d8209d
1 changed files with 17 additions and 5 deletions
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boost_build_v2.html
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@@ -21,12 +21,12 @@
br.clear { clear: left }
div.alert { color: red }
table { align: center; border: thin; }
</style>
</style>
</head>
<!-- Things yet to document:
- build request, build request expansion and directly requested targets
- conditional properties
-->
- build request, build request expansion and directly requested targets
- conditional properties
-->
<body>
<p><a href="../../index.htm"><img class="banner" height="86" width="277"
@@ -74,6 +74,8 @@
<dl class="page-index">
<dt><a href="#features_defined">Defintions</a></dt>
<dt><a href="#property_validity">Property Validity</a></dt>
<dt><a href="#feature_attributes">Feature Attributes</a></dt>
<dt><a href="#feature_declaration">Feature Declaration</a></dt>
@@ -485,6 +487,16 @@ boost-build /path/to/boost.build ;
<p>A <em>build specification</em> is a property set which fully describes
the set of features used to build a target.</p>
<h4><a name="property_validity">Property Validity</a></h4>
For <a href="#free">free</a> features, all values are valid. For all
other features, the valid values are explicitly specified, and the build
system will report an error for the use of an invalid feature-value.
Subproperty validity may be restricted so that certain values are valid
only in the presence of certain other subproperties. For example, it is
possible to specify that the <code>&lt;gcc-target&gt;mingw</code>
property is only valid in the presence of
<code>&lt;gcc-version&gt;2.95.2</code>.
<h4><a name="feature_attributes">Feature Attributes</a></h4>
<p>Each feature has a collection of zero or more of the following
@@ -524,7 +536,7 @@ boost-build /path/to/boost.build ;
</li>
<li>
<em>free</em>
<em><a name="free">free</a></em>
<p>Most features have a finite set of allowed values, and can only
take on a single value from that set in a given build specification.