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<!--
Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 The SCons Foundation
This file is processed by the bin/SConsDoc.py module.
See its __doc__ string for a discussion of the format.
-->
<cvar name="BUILDERS">
<summary>
A dictionary mapping the names of the builders
available through this environment
to underlying Builder objects.
Builders named
Alias, CFile, CXXFile, DVI, Library, Object, PDF, PostScript, and Program
are available by default.
If you initialize this variable when an
Environment is created:
<example>
env = Environment(BUILDERS = {'NewBuilder' : foo})
</example>
the default Builders will no longer be available.
To use a new Builder object in addition to the default Builders,
add your new Builder object like this:
<example>
env = Environment()
env.Append(BUILDERS = {'NewBuilder' : foo})
</example>
or this:
<example>
env = Environment()
env['BUILDERS]['NewBuilder'] = foo
</example>
</summary>
</cvar>
<cvar name="Dir">
<summary>
A function that converts a string
into a Dir instance relative to the target being built.
</summary>
</cvar>
<cvar name="ENV">
<summary>
A dictionary of environment variables
to use when invoking commands. When
&cv-ENV; is used in a command all list
values will be joined using the path separator and any other non-string
values will simply be coerced to a string.
Note that, by default,
&scons;
does
<emphasis>not</emphasis>
propagate the environment in force when you
execute
&scons;
to the commands used to build target files.
This is so that builds will be guaranteed
repeatable regardless of the environment
variables set at the time
&scons;
is invoked.
If you want to propagate your
environment variables
to the commands executed
to build target files,
you must do so explicitly:
<example>
import os
env = Environment(ENV = os.environ)
</example>
Note that you can choose only to propagate
certain environment variables.
A common example is
the system
<envar>PATH</envar>
environment variable,
so that
&scons;
uses the same utilities
as the invoking shell (or other process):
<example>
import os
env = Environment(ENV = {'PATH' : os.environ['PATH']})
</example>
</summary>
</cvar>
<cvar name="File">
<summary>
A function that converts a string into a File instance relative to the
target being built.
</summary>
</cvar>
<cvar name="SCANNERS">
<summary>
A list of the available implicit dependency scanners.
New file scanners may be added by
appending to this list,
although the more flexible approach
is to associate scanners
with a specific Builder.
See the sections "Builder Objects"
and "Scanner Objects,"
below, for more information.
</summary>
</cvar>
<cvar name="CHANGED_SOURCES">
<summary>
A reserved variable name
that may not be set or used in a construction environment.
(See "Variable Substitution," below.)
</summary>
</cvar>
<cvar name="CHANGED_TARGETS">
<summary>
A reserved variable name
that may not be set or used in a construction environment.
(See "Variable Substitution," below.)
</summary>
</cvar>
<cvar name="SOURCE">
<summary>
A reserved variable name
that may not be set or used in a construction environment.
(See "Variable Substitution," below.)
</summary>
</cvar>
<cvar name="SOURCES">
<summary>
A reserved variable name
that may not be set or used in a construction environment.
(See "Variable Substitution," below.)
</summary>
</cvar>
<cvar name="TARGET">
<summary>
A reserved variable name
that may not be set or used in a construction environment.
(See "Variable Substitution," below.)
</summary>
</cvar>
<cvar name="TARGETS">
<summary>
A reserved variable name
that may not be set or used in a construction environment.
(See "Variable Substitution," below.)
</summary>
</cvar>
<cvar name="UNCHANGED_SOURCES">
<summary>
A reserved variable name
that may not be set or used in a construction environment.
(See "Variable Substitution," below.)
</summary>
</cvar>
<cvar name="UNCHANGED_TARGETS">
<summary>
A reserved variable name
that may not be set or used in a construction environment.
(See "Variable Substitution," below.)
</summary>
</cvar>
<cvar name="TOOLS">
<summary>
A list of the names of the Tool specifications
that are part of this construction environment.
</summary>
</cvar>
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