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| -rw-r--r-- | doc/haddock.sgml | 13 |
1 files 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> |