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\chapter{Misc}
\section{Building gcc}\label{sec:gccbuilding}
This section explains how to build gcc from source.
These instructions have been tested on MacOS\footnote{Lion specifically} (where they are most needed).
Create a directory and put the following files in it (change version numbers as required).
\begin{itemize}
\item gmp-4.3.2.tar.bz2 (eg \url{ftp://gcc.gnu.org/pub/gcc/infrastructure})
\item mpfr-2.4.2.tar.bz2 (eg \url{http://www.mpfr.org/})
\item mpc-0.8.1.tar.gz (eg \url{mpc-0.8.1.tar.gz})
\item gcc source (eg \url{http://gcc.gnu.org/gcc-4.7/}
\end{itemize}
Change into the directory you created and
\begin{shellCode}
tar -xjf gmp-4.3.2.tar.bz2
tar -xjf mpfr-2.4.2.tar.bz2
tar -xzf mpc-0.8.1.tar.gz
tar -xjf gcc-4.7.1.tar.bz2
mv gmp-4.3.2 gcc-4.7.1/gmp
mv mpc-0.8.1 gcc-4.7.1/mpc
mv mpfr-2.4.2 gcc-4.7.1/mpfr
cd gcc-4.7.1
\end{shellCode}
\noindent Note that in the next step we specify the architecture explicitly.
This is because (on our test platform at least) some of the parts default to different architectures.
\begin{shellCode}
./configure --build=amd64-apple-darwin11.4.0
make
\end{shellCode}
\noindent Now go have several coffees, watch a movie or cook a roast.
\noindent Once the build has completed:
\begin{shellCode}
sudo make install
\end{shellCode}
\noindent Once this is done you can remove the directory you created at the beginning of this section.
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