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<?xml version="1.0" encoding="iso-8859-1"?>
<sect1 id="release-5-00">
<title>Release notes for version 5.00 (April 2001)</title>
<sect2>
<title>User-visible compiler changes</title>
<itemizedlist>
<listitem>
<para>GHCi, the new interactive environment on top of GHC, has
been added (<xref linkend="ghci">).</para>
</listitem>
<listitem>
<para>New <option>––make</option> flag added (<xref
linkend="make-mode">).</para>
</listitem>
<listitem>
<para>The native code generator now supports Sparc in addition
to x86.</para>
</listitem>
<listitem>
<para>We now make it clear which options can be placed in an
OPTIONS pragma. See <xref
linkend="static-dynamic-flags">.</para>
</listitem>
<listitem>
<para><option>-fglasgow-exts</option> no longer implies
<option>-package lang</option>.</para>
</listitem>
<listitem>
<para><option>-noC</option> is no more.</para>
</listitem>
<listitem>
<para><option>-hi</option> and <option>-nohi</option> are no more.</para>
</listitem>
<listitem>
<para>The concept of “packages” has been
generalised and extended. Packages may be installed or
removed from an existing GHC installation using the new
<command>ghc-pkg</command> tool. See <xref
linkend="packages">.</para>
</listitem>
<listitem>
<para>Initial unicode support: the <literal>Char</literal>
type is now 31 bits. We don't yet have support for unicode
I/O.</para>
</listitem>
<listitem>
<para><option>-v</option> now takes an optional numeric
argument indicating the level of verbosity (<xref
linkend="options-help">). <option>-dshow-passes</option> has
been removed.</para>
</listitem>
<listitem>
<para>Parallel list comprehensions added. See <xref
linkend="parallel-list-comprehensions">.</para>
</listitem>
<listitem>
<para>Functional dependencies are now fully implemented.
</para>
</listitem>
<listitem>
<para>Profiling: please use
<literal>{-# SCC ".." #-}</literal>
rather than <literal>_scc_ "..."</literal>. The latter
will be phased out in due course.</para>
</listitem>
<listitem>
<para>A new experimental optimisation, SpecConstr, is turned
on with <literal>-O2</literal>.</para>
</listitem>
<listitem>
<para>Please report bugs using the <ulink
url="http://sourceforge.net/projects/ghc/">SourceForge bug
tracker</ulink> instead of
<email>glasgow-haskell-bugs@haskell.org</email> if
possible.</para>
</listitem>
<listitem>
<para>Documentation changes: there's now a useful Flag
Reference section, see <xref linkend="flag-reference">.</para>
</listitem>
<listitem>
<para>Many, many, bugfixes.</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>New experimental features</title>
<itemizedlist>
<listitem>
<para>A “front panel” for GHC-compiled programs
displays real-time graphs of memory behaviour in a GTK+
window. You need to recompile the RTS with front panel
support to use this.</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>FFI changes</title>
<itemizedlist>
<listitem>
<para><command>hsc2hs</command> added (<xref linkend="hsc2hs">).</para>
</listitem>
<listitem>
<para>FFI libraries have been updated to the latest proposal
from the FFI task force. Too many changes to list here, see
the docs: <xref linkend="sec-Foreign">.</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>User-visible library changes</title>
<itemizedlist>
<listitem>
<para><function>putMVar</function> now blocks if the
<literal>MVar</literal> is already full. The
<literal>PutFullMVar</literal> exception no longer exists.
A non-blocking version of <function>putMVar</function>,
<function>tryPutMVar</function>, has been added (<xref
linkend="sec-MVars">).</para>
</listitem>
<listitem>
<para>The <literal>Int</literal> and
<literal>Integer</literal> types now have instances of
<literal>Bits</literal> (<xref linkend="sec-Bits">).</para>
</listitem>
<listitem>
<para>Package <literal>hssource</literal> has been added. It
contains a Haskell 98 abstract syntax, parser, lexer and pretty
printer. No documentation yet.</para>
</listitem>
<listitem>
<para>The methods <literal>fromInt</literal> and
<literal>toInt</literal>, which used to be in class
<literal>Num</literal> but exported from module
<literal>Int</literal>, are no longer in class
<literal>Num</literal>. They're still available from module
<literal>Int</literal>, however.</para>
<para>In most cases, there should be no benefit from using
<literal>fromInt</literal> instead of
<literal>fromIntegral</literal>, which is specialised for all
integral types.</para>
</listitem>
<listitem>
<para>New modules: DiffArray (<xref linkend="sec-DiffArray">),
StorableArray (<xref linkend="sec-StorableArray">),
MonadList, MonadCont (no documentation yet).</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>Build system changes</title>
<itemizedlist>
<listitem>
<para>The <literal>WithGhcHc</literal> setting in
<literal>build.mk</literal> has been replaced by the
<literal>––with-ghc=<replaceable>ghc</replaceable></literal>
option to <literal>configure</literal>. The new option
<emphasis>must</emphasis> be used if you intend to use
anything except “<literal>ghc</literal>” to
bootstrap GHC, in order that the build system can figure out
what version of GHC you're using.</para>
</listitem>
<listitem>
<para>Source distributions are now made by doing <literal>make
distclean</literal> in a build tree, instead of requiring a
linked build tree.</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>Internal changes</title>
<itemizedlist>
<listitem>
<para>Many internal compiler changes: too many to list
here.</para>
</listitem>
<listitem>
<para>The old perl driver has been removed and replaced by a
driver in the compiler proper.</para>
</listitem>
<listitem>
<para>We now use GMP 3 instead of GMP 2 for
arbitrary-precision integer support.</para>
</listitem>
<listitem>
<para>Several libraries rewritten to use the FFI.</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
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