X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=docs%2Fusers_guide%2Fdebugging.xml;h=d6a520a4d9bb655bcbf0eb17b2ed83870823f0cf;hb=aedb94f5f220b5e442b23ecc445fd38c8d9b6ba0;hp=4ab43791274bfc982be2b999846a540f4d3735d8;hpb=6e3538235f0b82c074874ddfaa4526e06901256d;p=ghc-hetmet.git

diff --git a/docs/users_guide/debugging.xml b/docs/users_guide/debugging.xml
index 4ab4379..d6a520a 100644
--- a/docs/users_guide/debugging.xml
+++ b/docs/users_guide/debugging.xml
@@ -280,14 +280,25 @@
       
       <varlistentry>
 	<term>
+          <option>-ddump-simpl-phases</option>:
+          <indexterm><primary><option>-ddump-simpl-phases</option></primary></indexterm>
+        </term>
+	<listitem>
+	  <para>Show the output of each run of the simplifier.  Used when even
+        <option>-dverbose-simpl</option> doesn't cut it.</para>
+	</listitem>
+      </varlistentry>
+
+      <varlistentry>
+	<term>
           <option>-ddump-simpl-iterations</option>:
           <indexterm><primary><option>-ddump-simpl-iterations</option></primary></indexterm>
         </term>
 	<listitem>
 	  <para>Show the output of each <emphasis>iteration</emphasis>
         of the simplifier (each run of the simplifier has a maximum
-        number of iterations, normally 4).  Used when even
-        <option>-dverbose-simpl</option> doesn't cut it.</para>
+        number of iterations, normally 4).  This outputs even more information
+        than <option>-ddump-simpl-phases</option>.</para>
 	</listitem>
       </varlistentry>
 
@@ -412,6 +423,20 @@
 
       <varlistentry>
 	<term>
+          <option>-dsuppress-uniques</option>
+          <indexterm><primary><option>-dsuppress-uniques</option></primary></indexterm>
+        </term>
+	<listitem>
+	  <para>Suppress the printing of uniques in debugging output. This may make 
+	  the printout ambiguous (e.g. unclear where an occurrence of 'x' is bound), but
+	  it makes the output of two compiler runs have many fewer gratuitous differences,
+	    so you can realistically apply <command>diff</command>.  Once <command>diff</command>
+	  has shown you where to look, you can try again without <option>-dsuppress-uniques</option></para>
+	</listitem>
+      </varlistentry>
+
+      <varlistentry>
+	<term>
           <option>-dppr-user-length</option>
           <indexterm><primary><option>-dppr-user-length</option></primary></indexterm>
         </term>
@@ -424,14 +449,18 @@
       </varlistentry>
 
       <varlistentry>
-	<term>
-          <option>-dshow-unused-imports</option>
-          <indexterm><primary><option>-dshow-unused-imports</option></primary></indexterm>
+        <term>
+          <option>-dno-debug-output</option>
+          <indexterm><primary><option>-dno-debug-output</option></primary></indexterm>
         </term>
-	<listitem>
-	  <para>Have the renamer report what imports does not
-	contribute.</para>
-	</listitem>
+        <listitem>
+          <para>Suppress any unsolicited debugging output.  When GHC
+            has been built with the <literal>DEBUG</literal> option it
+            occasionally emits debug output of interest to developers.
+            The extra output can confuse the testing framework and
+            cause bogus test failures, so this flag is provided to
+            turn it off.</para>
+        </listitem>
       </varlistentry>
     </variablelist>
   </sect2>
@@ -601,21 +630,9 @@ Main.skip2{-r1L6-} =
     of platform-specific code that needs to be written in order to get
     unregisterised compilation going is usually fairly small.</para>
 
-    <variablelist>
-      <varlistentry>
-	<term>
-          <option>-unreg</option>:
-          <indexterm><primary><option>-unreg</option></primary></indexterm>
-        </term>
-	<listitem>
-	  <para>Compile via vanilla ANSI C only, turning off
-	  platform-specific optimisations.  NOTE: in order to use
-	  <option>-unreg</option>, you need to have a set of libraries
-	  (including the RTS) built for unregisterised compilation.
-	  This amounts to building GHC with way "u" enabled.</para>
-	</listitem>
-      </varlistentry>
-    </variablelist>
+   <para>Unregisterised compilation cannot be selected at
+   compile-time; you have to build GHC with the appropriate options
+   set.  Consult the GHC Building Guide for details.</para>
   </sect2>
 
 </sect1>