<para>
The <literal>-#include</literal> flag and
<literal>INCLUDE</literal> pragma are now deprecated and
- ignored. GHC now generates its own C prototypes, rather than
- relying on C prototypes.
+ ignored. Since version 6.10.1, GHC has generated its own C
+ prototypes for foreign calls, rather than relying on
+ prototypes from C header files.
</para>
</listitem>
<listitem>
<para>
There is a new FFI calling convention called
- <literal>prim</literal>, which allows calling C-- function.
+ <literal>prim</literal>, which allows calling C-- functions
+ (see <xref linkend="ffi-prim" />).
Most users are not expected to need this.
</para>
</listitem>
block, but its result is not bound.
The flags <literal>-fwarn-unused-do-bind</literal>
and <literal>-fwarn-wrong-do-bind</literal> control
- these warnings.
- </para>
- </listitem>
-
- <listitem>
- <para>
- There is a new warning if a monadic result of type other than
- <literal>m ()</literal> is not bound.
- The flag <literal>-fwarn-unused-do-bind</literal> controls
- this warning.
+ these warnings (see <xref linkend="options-sanity" />).
</para>
</listitem>
<sect2>
<title>Runtime system</title>
+
+ <para>The following options are all described in
+ <xref linkend="rts-options-gc" />.</para>
+
<itemizedlist>
<listitem>
<para>
<listitem>
<para>
- The new flag <literal>+RTS -q1</literal> disables the parallel
- garbage collector.
+ The parallel GC now uses the same threads as the mutator,
+ with the consequence that you can no longer select a
+ different number of threads to use for GC.
+ The <option>-g<replaceable>n</replaceable></option> RTS
+ option has been removed, except that <option>-g1</option> is
+ still accepted for backwards compatibility.
</para>
- </listitem>
- <listitem>
<para>
The new flag
- <literal>+RTS -qg<replaceable>n</replaceable></literal>
- sets the minimum generation for which parallel garbage
- collection is used. Defaults to 1.
+ <literal>+RTS -qg<replaceable>gen</replaceable></literal> sets
+ the minimum generation for which parallel garbage collection
+ is used. Defaults to 1. The flag <literal>-qg</literal> on
+ its own disables parallel GC.
</para>
</listitem>
<listitem>
<para>
- The new flag <literal>+RTS -qa</literal>
- uses the OS to set thread affinity.
+ The new flag <literal>+RTS -qb<replaceable>gen</replaceable></literal>
+ controls load balancing in the parallel GC.
</para>
</listitem>
<listitem>
<para>
- The new flag <literal>+RTS -qb</literal>
- disables load balancing in the parallel garbage collector.
+ The new flag <literal>+RTS -qa</literal>
+ uses the OS to set thread affinity (experimental).
</para>
</listitem>
the new flag <literal>+RTS -l</literal> generates
<literal><replaceable>prog</replaceable>.eventlog</literal>
files, which tools such as ThreadScope can use to show the
- behaviour of your program. The
+ behaviour of your program (see <xref linkend="rts-eventlog" />). The
<literal>+RTS -D><replaceable>x</replaceable></literal> output
is also sent to the eventlog file if this option is enabled.
The <literal>+RTS -v</literal> flag sends eventlog data to
<para>
In order to generate the parsers, happy >= 1.16 is now
required. The parsers are pre-generated in the source tarball,
- so most users will not need happy.
+ so most users will not need Happy.
</para>
</listitem>
Support PageUp and PageDown keys.
</para>
</listitem>
-
- <listitem>
- <para>
- Let ctrl-L (clear-screen) work during getInputChar.
- </para>
- </listitem>
</itemizedlist>
</listitem>
</itemizedlist>
<para>
Packages can now be identified by a "package ID", which is
based on a hash of the ABIs. The new flag
- <literal>-package-id</literal> allows packages to be selected
- by this identifier.
+ <literal>-package-id</literal> allows packages to be
+ selected by this identifier (see <xref linkend="package-ids"
+ />). Package IDs enable GHC to detect potential
+ incompatibilities between packages and broken dependencies
+ much more accurately than before.
</para>
</listitem>
Rather than being a single <literal>package.conf</literal> file,
package databases now consist of a directory containing one
file per package, and a binary cache of the information.
+ GHC should be much faster to start up when the package
+ database grows large.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ There is a new command <literal>ghc-pkg init</literal> to
+ create a package database.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ There is a new command <literal>ghc-pkg dot</literal> to
+ generate a GraphViz graph of the dependencies between
+ installed packages.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
+ There is a new command <literal>ghc-pkg recache</literal> to
+ update the package database cache should it become out of
+ date, or for registering packages manually.
</para>
</listitem>
</itemizedlist>
<listitem>
<para>
+ Lazy I/O now throws an exception if an error is
+ encountered, in a divergence from the Haskell 98 spec which
+ requires that errors are discarded (see Section 21.2.2 of
+ the Haskell 98 report). The exception thrown is the usual
+ IO exception that would be thrown if the failing IO
+ operation was performed in the IO monad, and can be caught
+ by <literal>System.IO.Error.catch</literal>
+ or <literal>Control.Exception.catch</literal>.
+ </para>
+ </listitem>
+
+ <listitem>
+ <para>
It is now possible to create your own handles.
For more information, see the
<literal>GHC.IO.Handle</literal> haddock docs.
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