Install GCC

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GCC stands for GNU Compiler Collection. The latest version is GCC 4.3. The use of this tutorial is to install GCC 4, which is not available in some linux distributions. In those systems GCC 3 is available instead but I suppose that for some reason you need GCC 4. (Of course we will use GCC 3, or any other available C compiler to build GCC 4.) The tutorial is focused in obtaining 'g++' (GNU C++) among all the available compilers in the collection. This tutorial is based on this other guide, although this version is much more straightforward.

You can check which version of GCC is currently installed by running 

 $gcc -v
 ...
 gcc version 3.4.6 20060404 (Red Hat 3.4.6-3)

This tutorial is mainly oriented to install in a campus cluster. If you want a bleeding edge compiler in your Linux computer it is better to just use an up to date distribution instead of going through these instructions. For example Ubuntu 9.10 has as default compiler gcc 4.4, just by doing: 

sudo apt-get install gcc

Preparation and Downloads

The tutorial assumes that you want to install GCC/g++ in your userspace directories (i.e. in your home directory). To do that create the following directories: 

mkdir ~/soft
mkdir ~/usr

You will need the GMP library whose development (sources) are not installed in general (and in particular not in wcr). 

cd ~/soft
export GMP_VER=4.3.1
wget ftp://ftp.gmplib.org/pub/gmp-4.3.1/gmp-$GMP_VER.tar.gz
tar -zxvf gmp-$GMP_VER.tar.gz
cd gmp-$GMP_VER
./configure --prefix=$HOME/usr --with-local-prefix=$HOME/usr/local
make
make check
make install

Which will create ~/usr/lib/libgmp.[a,la,so] and ~/usr/include/gmp.h. Also you will need the MPFR library after GMP. 

cd ~/soft
export MPFR_VER=2.4.2
wget http://www.mpfr.org/mpfr-current/mpfr-$MPFR_VER.tar.gz
tar -zxvf mpfr-$MPFR_VER.tar.gz
cd mpfr-$MPFR_VER
./configure --prefix=$HOME/usr --with-gmp=$HOME/usr
make
make check
make install

This will create ~/usr/lib/libmpfr.[a,la,so] and ~/usr/include/mpfr.h.

Now, Download the sources to a local directory: 

cd ~/soft
mkdir gcc-source
svn svn checkout svn://gcc.gnu.org/svn/gcc/trunk gcc_source

GCC depends on MPC which can be installed separately or just compiled automatically by the GCC scripts. 

cd ~/soft/gcc-source
export MPC_VER=0.8.1
wget http://www.multiprecision.org/mpc/download/mpc-$MPC_VER.tar.gz
tar -zxvf mpc-$MPC_VER.tar.gz
mv mpc-$MPC_VER mpc

to install it separately, 

cd ~/soft
export MPC_VER=0.8.1
wget http://www.multiprecision.org/mpc/download/mpc-$MPC_VER.tar.gz
tar -zxvf mpc-$MPC_VER.tar.gz
cd mpc-$MPC_VER
./configure --prefix=$HOME/usr --with-gmp=$HOME/usr
make 
make install

Compilation

This is important and different from other usual compilation procedures: GCC should be compiled in a directory different from the source directory, in this case we will create a "build" directory. 

 cd ~/soft
 mkdir gcc-build
 cd gcc-build

Then we will 'configure' from that directory. Everything will be installed in ~/usr, including the executable compilers in ~/usr/bin and the library files in ~/usr/lib. To specify that you do 

 cd ~/soft/gcc-build
 ../gcc-source/configure --prefix=$HOME/usr --with-local-prefix=$HOME/usr/local --with-gmp=$HOME/usr --with-mpfr=$HOME/usr --enable-languages=c++,fortran

If you don't need the Fortran compiler specify --enable-languages=c++. (C compiler is enabled by default.) Even if you don't use Fortran it can be useful to compile Lapack for example.

Other options could be specified at this point, for example, GCC 3 in wcr was configured with this options 

 ... --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-awt=gtk --host=x86_64-redhat-linux

Which may or may not be important for you. Check that the configure works (if it doesn't, report it in this wiki) before doing: 

 export LD_LIBRARY_PATH=$HOME/usr/lib
 export LD_RUN_PATH=$HOME/usr/lib
 make                   #takes ~60 minutes, make -j 2 doesn't work

We do the final install: 

 make install

Important: there is no 'uninstall', if you want to remove GCC from ~/usr you have to do it manually which can be very difficult.

To test the version installed: 

 $ ~/usr/bin/g++ -v
 Using built-in specs.
 Target: x86_64-unknown-linux-gnu
 Configured with: ../gcc-4.3.3/configure --prefix=/home/correaa/usr --with-local-prefix=/home/correaa/usr/local --with-gmp=/home/correaa/usr --with-mpfr=/home/correaa/usr --enable-languages=c++
 Thread model: posix
 gcc version 4.3.3 (GCC)

and do 

 ~/usr/bin/g++ --print-search-dirs

to see which libraries and directories will be used by default.

The installation also includes the C++ Standard Template Library.

Basic Usage

This is the "Hello, world!" program 

 #include <iostream>
 int main(){
   std::cout << "Hello, world!\n";
 }

which can be compiled with our brand new compiler: 

 cd /tmp
 wget http://micro.stanford.edu/mediawiki-1.11.0/images/Hello_world.cpp.tar -o hello_world.cpp.tar
 tar -xvf hello_word.cpp.tar
 ~/usr/bin/g++ -Wl,-rpath=$HOME/usr/lib:$HOME/usr/lib64 hello_world.cpp -o hello_world
 ./hello_world

Note that you have to specify the tilde (~) in order to run that specific compiler and not the default system one. The rpath option tells the compiler to use your local (home) version of the runtime and standard libraries instead of the default ones (in /usr/lib and /usr/lib64).

In any case you can check which libraries are being used by doing: 

 ldd ./hello_world

Now you are powerful and can tell your friends that you compiled a compiler. Now seriously, you can build programs that you could not compile or compiled with bugs with the system compiler.

Libraries

By following this tutorial you should have the C and C++ compilers of the GNU Compiler Collection, with them you can use any decent C or C++ library available, for example the Standard Template Library (included with GCC), FFTW, BOOST and HDF5.

Install MPICH2

This is the procedure to compile and install the MPICH2 library and environment. The instructions are taken from the official documentation and from this wiki-page. 

 mkdir ~/usr
 mkdir ~/soft
 cd ~/soft
 wget http://www.mcs.anl.gov/research/projects/mpich2/downloads/tarballs/1.0.8/mpich2-1.0.8.tar.gz 
 tar -zxvf mpich2-1.0.8.tar.gz

Like GCC, MPICH2 should be compiled in a different directory than the location of the sources (this is not the case for version 1.1.: 

 mkdir mpich2-1.0.8-build
 cd mpich2-1.0.8-build
 ../mpich2-1.0.8/configure --prefix=$HOME/usr |& tee configure.log
 make |& tee make.log
 make install

The compilation takes ~20 minutes. (Do not try make -j 2 or make install only). The compiler wrappers (i.e. scripts to compile with MPI settings) are installed in ~/usr/bin, for example ~/usr/bin/mpicxx for the C++ MPI wrapper.

Now set up the environment, in your home directory create a configuration file. This need to be done only once. 

 cd ~/
 touch .mpd.conf
 chmod 600 .mpd.conf
 echo 'MPD_SECRETWORD=nano' > .mpd.conf

Test example

Now you are ready to compile the example (based on this original example) 

 cd ~/tmp
 wget http://micro.stanford.edu/mediawiki-1.11.0/images/Mpich2_example.tar -o mpich2_example.tar
 tar -xvf mpich2_example.tar 
 cd mpich2_example
 ~/usr/bin/mpicxx mpich2_example.cpp -o mpich2_example

Before executing a MPI program you will need to start the MPI daemon 

 ~/usr/bin/mpd &

And then the program can be run 

 ~/usr/bin/mpirun -np 2 ./mpich2_example
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