when you compile with <option>-threaded</option>, you now get
an RTS flag <option>-N</option> that allows you to specify the
number of OS threads that GHC should use. Defaults to 1.
- See <xref linkend="sec-using-smp" /> and <xref
+ See <xref linkend="using-smp" /> and <xref
linkend="lang-parallel" />.
</para>
</listitem>
<listitem>
<para>
- GHC's modules are now also bundled into a
- <literal>ghc</literal> package, allowing programs to make use
- of GHC as a library. The interface has not yet been properly
- designed, so is subject to change.
+ GHC now handles impredicative polymorphism; see <xref linkend="impredicative-polymorphism" />.
</para>
</listitem>
<listitem>
<para>
- GHC now handles impredicative polymorphism and there are
- changes to the way scoped type variables work; see
- <ulink url="http://www.haskell.org/pipermail/glasgow-haskell-users/2006-January/009565.html"> Simon's e-mail</ulink>
- for more details of the change, or <xref linkend="impredicative-polymorphism" /> for the documentation.
+ There are significant changes to the way scoped type variables work,
+ and some programs that used to compile may no longer do so.
+ The new story is documented in <xref linkend="scoped-type-variables" />.
+ (<ulink url="http://www.haskell.org/pipermail/glasgow-haskell-users/2006-January/009565.html"> Simon's e-mail</ulink>
+ gives some background, but the user manual should be complete (tell
+ us if not), and
+ certainly takes precedence if there is any conflict.)
</para>
</listitem>
<listitem>
<programlisting>
f (x, y) | x `seq` False = undefined
| otherwise = [x,y]</programlisting>
- See <xref linkend="sec-bang-patterns" /> for more details.
+ See <xref linkend="bang-patterns" /> for more details.
</para>
</listitem>
<listitem>
ignored in comments, so ASCII code with comments in, for
example, Latin-1 will also work.
</para>
+
+ <para>
+ A way to have Latin-1 source files pre-processed by GHC is
+ described in <xref linkend="pre-processor" />.
+ </para>
</listitem>
<listitem>
<para>
The following flags (and, where appropriate, their inverses)
used to be static (can only be given on
the command line) but are now dynamic (can also be given in
- a <literal>GHC_OPTIONS</literal> pragma or with
+ an <literal>OPTIONS_GHC</literal> pragma or with
<literal>:set</literal> in GHCi):
<option>-c</option>,
<option>-hcsuf</option>,
<option>-pgma</option>,
<option>-pgml</option>,
<option>-pgmdll</option>,
- <option>-pgmdep</option>,
<option>-pgmF</option>,
<option>-optl</option>,
<option>-optdll</option>,
</listitem>
<listitem>
<para>
+ The
+ <option>-no-recomp</option><indexterm><primary><option>-no-recomp</option></primary></indexterm>
+ option is now called
+ <option>-fforce-recomp</option><indexterm><primary><option>-fforce-recomp</option></primary></indexterm>.
+ (the old name is still accepted for backwards compatibility,
+ but will be removed in the future).
+ </para>
+ </listitem>
+ <listitem>
+ <para>
The <option>-fglobalise-toplev-names</option>
flag has been removed.
</para>
</listitem>
<listitem>
<para>
- It is now possible, with the <literal>-I</literal> RTS flag,
- to control the amount of idle time that happens before a major
- GC is performed. There is more detail in
- <xref linkend="rts-options-gc" />.
+ If the program is idle for a certain amount of time then GHC
+ will now take the opportunity to do a major garbage collection.
+ The amount of idle time that is required before that happens
+ is controlled by the new <literal>-I</literal> RTS flag.
+ There is more detail in <xref linkend="rts-options-gc" />.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ It is now possible to control the frequency that the RTS clock
+ ticks at with the new <literal>-V</literal> RTS flag. This is
+ normally handled automatically by other flags, but this flag
+ is needed if you want to increase the resolution of the time
+ profiler.
+ For more details see <xref linkend="rts-options-misc" />.
</para>
</listitem>
<listitem>
</listitem>
<listitem>
<para>
- The <option>-split-objs</option> flag, which makes libraries
- smaller, can now be used with <option>--make</option> and hence
+ The <option>-split-objs</option> flag, which when used to compile
+ libraries means executables using the library will be smaller,
+ can now be used with <option>--make</option> and hence
can be used by cabal.
See <xref linkend="options-linker" /> for more information.
</para>
</listitem>
<listitem>
<para>
+ GHC now supports postfix operators, as a simple generalisation of
+ left sections (<xref linkend="postfix-operators"/>).
+ </para>
+ </listitem>
+ <listitem>
+ <para>
Parallel arrays, as enabled by <literal>-fparr</literal>, no
- longer work.
+ longer work. They'll be coming back shortly, in full glory.
</para>
</listitem>
</itemizedlist>
See <xref linkend="ghci-commands" /> for more information.
</para>
</listitem>
+ <listitem>
+ <para>
+ GHCi now has an <literal>:edit</literal> command which pops
+ up an editor on the most recently loaded file, or a
+ specified file. See <xref linkend="ghci-commands" /> for
+ more information.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ GHCi now invokes <literal>print</literal> by default on the
+ result of IO actions and bindings at the prompt. This is
+ occasionally not what you want, so it can be disabled (at
+ least for bindings) with
+ <literal>:set -fno-print-bind-result</literal>. See <xref
+ linkend="ghci-stmts" />.</para>
+ </listitem>
</itemizedlist>
</sect2>
<itemizedlist>
<listitem>
<para>
- Version number 2.0 (was 1.0).
+ Version number 2.1 (was 1.0).
</para>
</listitem>
<listitem>
<literal>inline</literal> which, provided the RHS is visible
to the compiler, forcibly inlines its argument.
Otherwise, it acts like <literal>id</literal>.
+ For more details, see <xref linkend="special-ids" />.
</para>
</listitem>
<listitem>
<para>
<literal>GHC.Exts</literal> now provides a function
- <literal>lazy</literal> which forces GHC to think that its
- argument is lazy in its first argument.
+ <literal>lazy</literal>, where <literal>lazy f</literal>
+ behaves like <literal>f</literal>, except GHC is forced
+ to believe that it is lazy in its first argument.
+ For more details, see <xref linkend="special-ids" />.
</para>
</listitem>
<listitem>
<itemizedlist>
<listitem>
<para>
- Version number 2.0 (was 1.0).
+ Version number 2.1 (was 1.0).
</para>
</listitem>
<listitem>
<itemizedlist>
<listitem>
<para>
- Version number 2.0 (was 1.0).
+ Version number 2.1 (was 1.0).
</para>
</listitem>
<listitem>
<literal>network</literal> package.
</para>
</listitem>
+ <listitem>
+ <para>
+ The <literal>Network.CGI.Compat</literal> module provides
+ a similar interface to the old <literal>Network.CGI</literal>
+ module, but it uses <literal>Text.XHtml</literal> rather than
+ <literal>Text.Html</literal>.
+ </para>
+ </listitem>
</itemizedlist>
</sect3>
</sect2>
<sect2>
+ <title>GHC As A Library</title>
+ <para>
+ Version number 6.6.
+ </para>
+ <para>
+ The internal modules of GHC are now available as a library, package
+ name <literal>ghc</literal>.
+ The interface has not been designed with use by other programs
+ in mind, so expect the API to vary radically in future
+ releases.
+ </para>
+ <para>
+ An introduction to using the library can be found
+ <ulink url="http://www.haskell.org/haskellwiki/GHC/As_a_library">on the wiki</ulink>.
+ </para>
+ </sect2>
+
+ <sect2>
<title>Internal changes</title>
<itemizedlist>
<listitem>
projects / ghc-hetmet.git / blobdiff