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<chapter title="Backward Compatibility">
<p>Pike is a language under active development. This can lead to
incompatibilities between different versions of Pike. To alleviate
this problem Pike has a backward compatibility layer.</p>
<p>The backward compatibility layer can be engaged in two ways;
either by starting the Pike interpreter with the <tt>-V</tt> option,
or by using the <tt>#pike</tt> preprocessor directive.</p>
<p>The backward compatibility layer affects both the compiler and the
available modules.</p>
<p>Note that the backward compatibility layer does not necessarily
compensate for all incompatibilities documented here, and that
there may be other incompatibilities that have not been documented.</p>
<p>The remainder of this chapter describes the main incompatibilities
between the various versions of Pike and the current version.</p>
<section title="Pike 7.8">
<subsection title="Global Functions">
<p><ref>decode_value()</ref> used to be able to decode programs using
the 'old style' program encoding.</p>
</subsection>
<subsection title="Modules">
<p>The SSL module API has had major changes since Pike 7.8.</p>
<p>The following modules and functions have moved, been renamed or
been deleted:
<matrix>
<r><c><ref>7.8::Gdbm.gdbm</ref></c>
<c><ref>Gdbm.DB</ref></c></r>
<r><c><ref>7.8::Locale.Charset</ref></c>
<c><ref>Charset</ref></c></r>
<r><c><ref>7.8::SSL.alert</ref></c>
<c><ref>SSL.Alert</ref></c></r>
<r><c><ref>7.8::SSL.connection</ref> +
<ref>7.8::SSL.handshake</ref></c>
<c><ref>SSL.ClientConnection</ref> +
<ref>SSL.ServerConnection</ref></c></r>
<r><c><ref>7.8::SSL.context</ref></c>
<c><ref>SSL.Context</ref></c></r>
<r><c><ref>7.8::SSL.packet</ref></c>
<c><ref>SSL.Packet</ref></c></r>
<r><c><ref>7.8::SSL.session</ref></c>
<c><ref>SSL.Session</ref></c></r>
<r><c><ref>7.8::SSL.sslfile</ref></c>
<c><ref>SSL.File</ref></c></r>
<r><c><ref>7.8::SSL.sslport</ref></c>
<c><ref>SSL.Port</ref></c></r>
<r><c><ref>7.8::SSL.state</ref></c>
<c><ref>SSL.State</ref></c></r>
<r><c><ref>7.8::Tools.PEM</ref></c>
<c><ref>Standards.PEM</ref></c></r>
<r><c><ref>7.8::Tools.X509</ref></c>
<c><ref>Standards.X509</ref></c></r>
<r><c><ref>7.8::Yabu.db</ref></c>
<c><ref>Yabu.DB</ref></c></r>
<r><c><ref>7.8::Yabu.table</ref></c>
<c><ref>Yabu.Table</ref></c></r>
<r><c><ref>7.8::_PGsql</ref></c>
<c>(deleted)</c></r>
<r><c><ref>7.8:_files</ref></c>
<c><ref>_Stdio</ref></c></r>
</matrix>
</p>
</subsection>
<subsection title="Compiler">
<p>The compiler used to not complain about use of
the keyword <tt>static</tt>.</p>
<p>The ancient syntax for arrays (<tt>string *</tt> was an alias for
<tt>array(string)</tt>) used to be supported (but complained about),
but has now been removed completely.</p>
</subsection>
<subsection title="Build options">
<p>The builtin security sandbox has been deprecated.</p>
<p>Compiling without support for bignums is no longer supported.</p>
<p>The (optional) support for facet classes has been removed.</p>
</subsection>
</section>
<section title="Pike 7.6">
<subsection title="Modules">
<p>Signal handlers in GTK2 used to get their arguments in the
form of an array.</p>
<p>Sql.mysql used to automatically attempt to reconnect on
broken connection.</p>
<p>The following modules and functions have moved, been renamed or
been deleted:
<matrix>
<r><c><ref>ADT.Heap.size()</ref></c>
<c>Deprecated by <ref>ADT.Heap._sizeof()</ref></c></r>
<r><c><ref>ADT.Heap.top()</ref></c>
<c>Deprecated by <ref>ADT.Heap.pop()</ref></c></r>
<r><c><ref>7.6::Array.transpose_old</ref></c>
<c>(deleted)</c></r>
<r><c><ref>7.6::Image.colortable</ref></c>
<c><ref>Image.Colortable</ref></c></r>
<r><c><ref>7.6::Image.font</ref></c>
<c><ref>Image.Font</ref></c></r>
<r><c><ref>7.6::Image.image</ref></c>
<c><ref>Image.Image</ref></c></r>
<r><c><ref>7.6::_Charset</ref></c>
<c><ref>Locale.Charset.module</ref></c></r>
<r><c><ref>7.6::spider.isbasechar()</ref></c>
<c><ref>Parser.XML.isbasechar()</ref></c></r>
<r><c><ref>7.6::spider.iscombiningchar()</ref></c>
<c><ref>Parser.XML.iscombiningchar()</ref></c></r>
<r><c><ref>7.6::spider.isdigit()</ref></c>
<c><ref>Parser.XML.isdigit()</ref></c></r>
<r><c><ref>7.6::spider.isextender()</ref></c>
<c><ref>Parser.XML.isextender()</ref></c></r>
<r><c><ref>7.6::spider.isfirstnamechar()</ref></c>
<c><ref>Parser.XML.isfirstnamechar()</ref></c></r>
<r><c><ref>7.6::spider.ishexchar()</ref></c>
<c><ref>Parser.XML.ishexchar()</ref></c></r>
<r><c><ref>7.6::spider.isidographic()</ref></c>
<c><ref>Parser.XML.isidographic()</ref></c></r>
<r><c><ref>7.6::spider.isletter()</ref></c>
<c><ref>Parser.XML.isletter()</ref></c></r>
<r><c><ref>7.6::spider.isnamechar()</ref></c>
<c><ref>Parser.XML.isnamechar()</ref></c></r>
<r><c><ref>7.6::spider.isspace()</ref></c>
<c><ref>Parser.XML.ispace()</ref></c></r>
</matrix>
</p>
</subsection>
<subsection title="Compiler">
<p>The compiler used to not complain about use of
the keyword <tt>nomask</tt>.</p>
</subsection>
<subsection title="Runtime">
<p>The <tt>main()</tt> function used to get the environment
as a mapping in argument number three.</p>
<p>The API for <ref>Debug.describe_program()</ref> was different.</p>
</subsection>
</section>
<section title="Pike 7.4 and earlier">
<subsection title="Deprecated">
<p>The backward compatibility code for Pike 7.4 and earlier
has been removed in Pike 8.0.</p>
</subsection>
</section>
</chapter>
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