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<!--
Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 The SCons Foundation
This file is processed by the bin/SConsDoc.py module.
See its __doc__ string for a discussion of the format.
-->
<scons_function name="AllowSubstExceptions">
<arguments signature="global">
([exception, ...])
</arguments>
<summary>
Specifies the exceptions that will be allowed
when expanding construction variables.
By default,
any construction variable expansions that generate a
<literal>NameError</literal>
or
<literal>IndexError</literal>
exception will expand to a
<literal>''</literal>
(a null string) and not cause scons to fail.
All exceptions not in the specified list
will generate an error message
and terminate processing.
If
&f-AllowSubstExceptions;
is called multiple times,
each call completely overwrites the previous list
of allowed exceptions.
Example:
<example>
# Requires that all construction variable names exist.
# (You may wish to do this if you want to enforce strictly
# that all construction variables must be defined before use.)
AllowSubstExceptions()
# Also allow a string containing a zero-division expansion
# like '${1 / 0}' to evalute to ''.
AllowSubstExceptions(IndexError, NameError, ZeroDivisionError)
</example>
</summary>
</scons_function>
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