Document extended behaviour of LIBS and LIBDIRS.

git-svn-id: http://svn.cactuscode.org/flesh/trunk@4460 17b73243-c579-4c4c-a9d2-2d5706c11dac

1 files changed, 8 insertions, 1 deletions

diff --git a/doc/UsersGuide/RunningCactus.tex b/doc/UsersGuide/RunningCactus.tex
index 8a063075..a62b44bf 100644
--- a/doc/UsersGuide/RunningCactus.tex
+++ b/doc/UsersGuide/RunningCactus.tex
@@ -593,12 +593,19 @@ Used to specify auxiliary libraries and directories to find them in.
 
 \begin{Lentry}
 \item [\texttt{LIBS}]
-Additional libraries.  \emph{Warning:} This variable is ignored while
+Additional libraries.
+This variable can also contain linker options, e.g.\ to switch between
+static and dynamic linking.  (Cactus adds an \verb+-l+ prefix to
+library names, but does not modify linker options.)
+\emph{Warning:} This variable is ignored while
 the compilers and linkers are autodetected.  This can lead to strange
 errors while configuring.  You can pass the additional libraries in
 the variable \texttt{LD} instead.
 
 \item [\texttt{LIBDIRS}] Any other library directories.
+This variable can also contain linker options.  (Cactus adds an
+\verb+-L+ prefix to library directories, but does not modify linker
+options.)
 \end{Lentry}
 
 \item {Extra include directories}