Attention

The ShARC HPC cluster was decommissioned on the 30th of November 2023 at 17:00. It is no longer possible for users to access that cluster.

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 4.8.5

$ gcc -v

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC)

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

module load dev/gcc/8.2
module load dev/gcc/6.3
module load dev/gcc/6.2
module load dev/gcc/5.4

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

Language support

• Which version(s) of GCC support which features of the C99 and C11 standards?

• Which version(s) of GCC support which features of the C++98, C++11, C++14 and C++17 standards?

Documentation

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

man gcc

• What’s new in the gcc version 8 series?

• What’s new in the gcc version 6 series?

• What’s new in the gcc version 5 series?

Installation Notes

These notes are primarily for system administrators:

Version 8.2

• Installation script

• gcc 8.2 modulefile saved as /usr/local/modulefiles/dev/gcc/8.2

Version 6.3

• Installation script

• gcc 6.3 modulefile saved as /usr/local/modulefiles/dev/gcc/6.3

Version 6.2

• Installation script

• gcc 6.2 modulefile saved as /usr/local/modulefiles/dev/gcc/6.2

Version 5.4

• Installation script

• this modulefile, saved as /usr/local/modulefiles/dev/gcc/5.4

Version 4.9.4

• this script

• this modulefile, saved as /usr/local/modulefiles/dev/gcc/4.9.4