X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fdocs%2Fusers_guide%2Fseparate_compilation.xml;h=97fe772b2cce64ac1a327de5dfd560c6da593bce;hb=d63bd45eb342eed90573f48b2b66edd9b08377b8;hp=cae8d352fc08ff8cff74a22d71e15a4d7676ebcf;hpb=6df96e7212debd7e9c9cf7b4b6ab3ad336bf3a5c;p=ghc-hetmet.git

diff --git a/ghc/docs/users_guide/separate_compilation.xml b/ghc/docs/users_guide/separate_compilation.xml
index cae8d35..97fe772 100644
--- a/ghc/docs/users_guide/separate_compilation.xml
+++ b/ghc/docs/users_guide/separate_compilation.xml
@@ -922,6 +922,14 @@ M.o : X.hi-boot
        <command>ghc</command> traces the dependencies, just like <command>ghc --make</command>
        (a new feature in GHC 6.4).</para>
 
+    <para>Note that <literal>ghc -M</literal> needs to find a <emphasis>source
+	file</emphasis> for each module in the dependency graph, so that it can
+      parse the import declarations and follow dependencies.  Any pre-compiled
+      modules without source files must therefore belong to a
+      package<footnote><para>This is a change in behaviour relative to 6.2 and
+	earlier.</para>
+      </footnote>.</para>
+
         <para>By default, <command>ghc -M</command> generates all the
         dependencies, and then concatenates them onto the end of
         <filename>makefile</filename> (or