Document -fwarn-unrecognised-pragmas; fixes trac #3031

[ghc-hetmet.git] / docs / users_guide / using.xml

diff --git a/docs/users_guide/using.xml b/docs/users_guide/using.xml
index d6eb6ed..20bb687 100644 (file)
--- a/docs/users_guide/using.xml
+++ b/docs/users_guide/using.xml
@@ -918,6 +918,23 @@ ghc -c Foo.hs</screen>
     <variablelist>
 
       <varlistentry>
+       <term><option>-fwarn-unrecognised-pragmas</option>:</term>
+       <listitem>
+         <indexterm><primary><option>-fwarn-unrecognised-pragmas</option></primary>
+         </indexterm>
+         <indexterm><primary>warnings</primary></indexterm>
+         <indexterm><primary>pragmas</primary></indexterm>
+         <para>Causes a warning to be emitted when a
+         pragma that GHC doesn't recognise is used. As well as pragmas
+      that GHC itself uses, GHC also recognises pragmas known to be used
+      by other tools, e.g. <literal>OPTIONS_HUGS</literal> and
+      <literal>DERIVE</literal>.</para>
+
+         <para>This option is on by default.</para>
+       </listitem>
+      </varlistentry>
+
+      <varlistentry>
        <term><option>-fwarn-warnings-deprecations</option>:</term>
        <listitem>
          <indexterm><primary><option>-fwarn-warnings-deprecations</option></primary>