GNU Compilers (gcc, g++, gfortran)

Overview

The GNU Compiler Collection supports a number of programming languages.

Several versions are available on the zCSF – please see the table below.

Programming in Fortran or C is currently beyond the scope of this webpage. IT Services for Research run training courses which may be of interest.

Restrictions on use

Code may be compiled on the login node, but aside from ‘very’ short test runs (e.g., one minute on fewer than 4 cores), executables must always be run by submitting to the batch system, or run in an interactive session on a backend node.

The GNU compiler is typically used by the Nvidia nvcc compiler to compile CUDA (host) code.

Set up procedure

This depends on which version you require.

Version	Commands/compilers available	Module required	Additional Notes
4.4.6	gcc, gfortran	None	This is considered the system default
4.8.2	gcc, gfortran	module load compilers/gcc/4.8.2

By loading/swapping modules, the correct LD_LIBRARY_PATH will be set.

Running the application

Example Code Compilations

   gcc hello_world.c -o hello
       #
       # ...produces executable binary called "hello"...
       #

   gfortran hello_fworld.f77 -o f77hello
   gfortran hello_fworld.f95 -o f95hello
       #
       # ...produce executable binary called "f77hello" or "f95hello"...
       #

If you compile an application with the non-default version (i.e., you load the gcc modulefile to select a new version) then you must also load that modulefile whenever you run the application.

Further info

• Online manuals available from the command line:

     man gcc
         # for the C/C++ compiler

     man gfortran
         # for the fortran compiler

• GNU Compiler Collection website
• Training Courses run by IT Services for Research.
• If you require advice on programming matters, for example how to debug a code, or how to use MKL, please email its-ri-team@manchester.ac.uk

Updates

None