<varlistentry>
<term>
- <option>-pgmm</option> <replaceable>cmd</replaceable>
- <indexterm><primary><option>-pgmm</option></primary></indexterm>
- </term>
- <listitem>
- <para>Use <replaceable>cmd</replaceable> as the
- mangler.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term>
<option>-pgms</option> <replaceable>cmd</replaceable>
<indexterm><primary><option>-pgms</option></primary></indexterm>
</term>
</term>
<listitem>
<para>Use GHC's native code generator rather than
- compiling via C. This will compile faster (up to twice as
- fast), but may produce code that is slightly slower than
- compiling via C. <option>-fasm</option> is the default.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term>
- <option>-fvia-C</option>
- <indexterm><primary><option>-fvia-C</option></primary></indexterm>
- </term>
- <listitem>
- <para>Compile via C instead of using the native code
- generator. This is the default on architectures for which GHC
- doesn't have a native code generator.</para>
+ compiling via LLVM.
+ <option>-fasm</option> is the default.</para>
</listitem>
</varlistentry>
<listitem>
<para>Compile via LLVM instead of using the native code
generator. This will generally take slightly longer than the
- native code generator to compile but quicker than compiling
- via C. Produced code is generally the same speed or faster
+ native code generator to compile.
+ Produced code is generally the same speed or faster
than the other two code generators. Compiling via LLVM
requires LLVM version 2.7 or later to be on the path.</para>
</listitem>
on the command line or via the <envar>GHCRTS</envar> environment variable.
There are three possibilities:
</para>
- <itemizedlist>
- <listitem>
- <option>-rtsopts=none</option> disables all processing of RTS options.
- Passing <option>+RTS</option> anywhere on the command line causes the program
- to abort with an error message. Setting the <envar>GHCRTS</envar> environment
- variable causes a warning is printed before the main Haskell program runs.
- </listitem>
- <listitem>
- <option>-rtsopts=some</option> enables only the "safe" RTS options on the
- command line. (Currently only <option>-?</option> and <option>--info</option>.)
- Any other RTS options on the command line abort the program with an error
- message. All RTS options in the <envar>GHCRTS</envar> environment variable are
- processed as normal. This is the default setting.
- </listitem>
- <listitem>
- <option>-rtsopts=all</option> (or just <option>-rtsopts</option>) enables
- <emphasis>all</emphasis> RTS option processing, both on the command line and
- through the <envar>GHCRTS</envar> environment variable.
- </listitem>
- </itemizedlist>
+ <variablelist>
+ <varlistentry>
+ <term><option>-rtsopts=none</option></term>
+ <listitem>
+ <para>
+ Disable all processing of RTS options.
+ If <option>+RTS</option> appears anywhere on the command
+ line, then the program will abort with an error message.
+ If the <envar>GHCRTS</envar> environment variable is
+ set, then the program will emit a warning message,
+ <envar>GHCRTS</envar> will be ignored, and the program
+ will run as normal.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>-rtsopts=some</option></term>
+ <listitem>
+ <para>[this is the default setting] Enable
+ only the "safe" RTS options: (Currently
+ only <option>-?</option>
+ and <option>--info</option>.) Any other RTS options
+ on the command line or in the <envar>GHCRTS</envar>
+ environment variable causes the program with to abort
+ with an error message.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>-rtsopts=all</option>, or
+ just <option>-rtsopts</option></term>
+ <listitem>
+ <para>
+ Enable <emphasis>all</emphasis> RTS option
+ processing, both on the command line and through
+ the <envar>GHCRTS</envar> environment variable.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
<para>
- Prior to GHC 7.0, the default was to process all RTS options. However, since
- RTS options can be used to write logging data to arbitrary files under the
- security context of the running program, there is a potential security problem.
- For this reason, GHC 7.0 defaults to <option>-rtsops=some</option>.
+ In GHC 6.12.3 and earlier, the default was to process all
+ RTS options. However, since RTS options can be used to
+ write logging data to arbitrary files under the security
+ context of the running program, there is a potential
+ security problem. For this reason, GHC 7.0.1 and later
+ default to <option>-rtsops=some</option>.
</para>
</listitem>
</varlistentry>
<para>
This option allows you to set the default RTS options at link-time. For example,
<option>-with-rtsopts="-H128m"</option> sets the default heap size to 128MB.
- This will now always be the default heap size, unless the user overrides it.
+ This will always be the default heap size for this program, unless the user overrides it.
(Depending on the setting of the <option>-rtsopts</option> option, the user might
not have the ability to change RTS options at run-time, in which case
<option>-with-rtsopts</option> would be the <emphasis>only</emphasis> way to set
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