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Compilers

Hyak provides multiple compiler versions for C, C++, and Fortran on each system. Compilers are available through environment modules and should be loaded before building software.

Available compiler versions may change over time. Use module spider <compiler> or module avail to confirm which modules are currently available.

For MPI builds, load an MPI module and compile with MPI compiler wrappers. See MPI for details.

note

Klone uses a flat module structure, so compiler modules are visible without loading another module first.

The following base compiler families are supported on Klone:

VendorModuleCompilers
GNUgccC: gcc
C++: g++
Fortran: gfortran
Intelintel/oneAPIC: icx
C++: icpx
Fortran: ifx
NVIDIAnvhpcC: nvc
C++: nvc++
Fortran: nvfortran
AMDaoccC: clang
C++: clang++
Fortran: flang

GNU Compiler Collection (GCC)​

The latest GNU Compiler Collection (GCC) module on Klone is version 15.2.

module load gcc/15.2.0

Older GCC versions are also available, including some combinations with MPI support. Additional modules prefixed with contrib may also appear; these are community-provided and maintained by their owners.

gcc/9.3.0
gcc/10.2.0
gcc/11.2.0                (D)
gcc/12.3.0
gcc/13.2.0
gcc/15.2.0

Intel Compiler​

The latest Intel compiler suite on Klone is version 2026.0.0. This module is provided as part of the Intel oneAPI suite.

module load intel/oneAPI/2026.0.0
MPI workflows

For Intel oneAPI MPI workflows on Klone, use intel/oneAPI/2026.0.0. Older oneAPI modules have shown MPI-related segmentation fault errors with the current Klone kernel. The 2026 release also removes the legacy icc, icpc, and ifort compilers; use icx, icpx, and ifx instead. For more background, see the June 2026 update.

NVIDIA Compiler​

The latest NVIDIA compiler suite on Klone is version 24.5. This module is provided as part of the NVIDIA HPC SDK.

module load nvhpc/24.5

CUDA Compiler Driver​

The CUDA compiler driver, nvcc, is used to compile CUDA code. The latest CUDA module on Klone is version 12.9.1.

module load cuda/12.9.1

There are older CUDA versions available.

AOCC Compiler​

The AOCC (AMD Optimizing C/C++ Compiler) suite is based on LLVM and includes optimizations for AMD processors. The latest AOCC compiler module on Klone is version 4.2.0.

module load aocc/4.2.0