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Iceberg reaches end-of-life on 30th November 2020. If you are running jobs on Iceberg then you need to take urgent action to ensure that your jobs/scripts will run on ShARC or Bessemer. If you have never used ShARC or Bessemer then now is the time to test your scripts. Not all software on Iceberg is available on ShARC/Bessemer.

GNU Compiler Collection (gcc)

The GNU Compiler Collection (gcc) is a widely used, free collection of compilers including C (gcc), C++ (g++) and Fortran (gfortran). The defaut version of gcc on the system is 4.4.7

gcc -v

Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl= --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj- --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC)

It is possible to switch to other versions of the gcc compiler suite using modules. After connecting to iceberg (see Establishing a SSH connection), start an interactive sesssion with the qrsh or qsh command. Choose the version of the compiler you wish to use using one of the following commands

module load compilers/gcc/6.2
module load compilers/gcc/5.4
module load compilers/gcc/5.3
module load compilers/gcc/5.2
module load compilers/gcc/4.9.2
module load compilers/gcc/4.8.2
module load compilers/gcc/4.5.3

Alternatively load the most recent available version using

module load compilers/gcc

Confirm that you’ve loaded the version of gcc you wanted using gcc -v.

Language support


man pages are available on the system. Once you have loaded the required version of gcc, type

man gcc

Installation Notes

These notes are primarily for system administrators