From 8dfc491f900907ea236c627745fe90b72a9aa56b Mon Sep 17 00:00:00 2001
From: simonmar <unknown>
Date: Fri, 9 Jan 2004 12:45:46 +0000
Subject: [haddock @ 2004-01-09 12:45:46 by simonmar] Add -optP-P to example
 ghc command line.

---
 doc/haddock.sgml | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/doc/haddock.sgml b/doc/haddock.sgml
index 1539126b..72446566 100644
--- a/doc/haddock.sgml
+++ b/doc/haddock.sgml
@@ -550,16 +550,19 @@
       which we also need to run the C pre-processor:</para>
 
 <screen>
-$ ghc -cpp -E -D__HADDOCK__ Foo.lhs -o Foo.hs
+$ ghc -cpp -E -optP-P -D__HADDOCK__ Foo.lhs -o Foo.hs
 $ haddock -h Foo.hs ...
 </screen>
 
       <para>The <option>-E</option> option to GHC says "stop after
-      pre-processing", the <option>-cpp</option> turns on the C
-      pre-processor, and the <option>-D__HADDOCK__</option> option
+      pre-processing", the <option>-cpp</option> option turns on the C
+      pre-processor, the <option>-optP-P</option> option tells the C
+      pre-processor not to leave any extra dropping behind (see the
+      description of the <option>-P</option> option in the gcc manual
+      for details), and the <option>-D__HADDOCK__</option> option
       defines the symbol <literal>__HADDOCK__</literal> when
-      pre-processing (this is sometimes handy if you need to
-      any pre-processing conditionals in your source which depend on
+      pre-processing (this is sometimes handy if you need to any
+      pre-processing conditionals in your source which depend on
       whether the source is going to be fed to Haddock).</para>
     </section>
 
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