LLVM libc++ support

• Can build the entire software stack with libc++ from the LLVM project instead of libstdc++
• Add xwidget support at Jupyter Lab
• Add Jupyter kernels for C++ and CUDA (C++ 11, 14, 17) based on the kernel of the Cling project
  • https://github.com/root-project/cling/tree/master/tools/Jupyter

Cling 0.6 support

• Update of Xeus-Cling to version 0.8, which officially supports cling 0.6.
• xwidget installed
• Clang 9 can be used as a host compiler
• The HPCCM command is automatically stored in the container (for reproducibility).
• clang-tidy and clang-tools installed
• Added support for sregistry
• allows user-defined URLs, branches and commit hashes for the cling repository

Performace Release

Improvement of the build time, in particular of cling

• use ninja as build system for cling
  • allows to specify different number of threads for compiling and linking
    • should improve the utilization on many systems
• reduction of cling backends to host and NVPTX
• replace the GCC 5.4 project compiler with Clang 8
• update cxxopts to 2.2.0

Port all container recipes to Python

• All recipes (release and development) are based on the same Python class using the hpccm library
• The different containers are generated using different frontend scripts
• Adding an experimental multi-stage build