Mentions some more makefile flags. Explain them roughly.

git-svn-id: http://svn.cactuscode.org/flesh/trunk@4243 17b73243-c579-4c4c-a9d2-2d5706c11dac

1 files changed, 22 insertions, 9 deletions

diff --git a/doc/UsersGuide/ThornWriters.tex b/doc/UsersGuide/ThornWriters.tex
index 83460b3e..636a76e0 100644
--- a/doc/UsersGuide/ThornWriters.tex
+++ b/doc/UsersGuide/ThornWriters.tex
@@ -822,15 +822,28 @@ and has a working directory of \texttt{<config>/build/<thorn\_name>} .
 \subsection{Other makefile variables}
 
 \begin{itemize}
-\item \texttt{CC}
-\item \texttt{CXX}
-\item \texttt{F90}
-\item \texttt{F77}
-\item \texttt{CFLAGS}
-\item \texttt{CXXFLAGS}
-\item \texttt{F90FLAGS}
-\item \texttt{F77FLAGS}
-\item \texttt{LD}
+\item \texttt{CPP}: The C preprocessor which is used to preprocess C
+  and C++ source code, and to determine the C and C++ make
+  dependencies
+\item \texttt{FPP}: The C preprocessor which is used to preprocess
+  Fortran source code
+\item \texttt{CPPFLAGS}: Flags which are passed to \texttt{CPP}, to
+  \texttt{CC}, and to \texttt{CXX}
+\item \texttt{FPPFLAGS}: Flags which are passed to \texttt{FPP}
+\item \texttt{CC}: The C compiler
+\item \texttt{CXX}: The C++ compiler
+\item \texttt{F77}: The Fortran 77 compiler.  This is only used if
+  there is no Fortran 90 compilers
+\item \texttt{F90}: The Fortran 90 compiler.  If this variables is
+  set, it is also used to compile Fortran 77 files
+\item \texttt{CFLAGS}: Flags which are passed to \texttt{CC}
+\item \texttt{CXXFLAGS}: Flags which are passed to \texttt{CXX}
+\item \texttt{F77FLAGS}: Flags which are passed to \texttt{F77}
+\item \texttt{F90FLAGS}: Flags which are passed to \texttt{F90}
+\item \texttt{LD}: The binder.  This should not be directly
+  \texttt{ld}, but should be a compiler driver such as \texttt{c++}.
+  Often, \texttt{LD} is the same as \texttt{CXX}
+\item \texttt{LDFLAGS}: Flags which are passed to \texttt{LD}
 \end{itemize}
 
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