v0.15.0 (2020-06-28)

v0.15.0 is a major feature release.

Major Features in this release

1. Cray support Spack will now work properly on Cray "Cluster"
   systems (non XC systems) and after a module purge command on Cray
   systems. See #12989

2. Virtual package configuration Virtual packages are allowed in
   packages.yaml configuration. This allows users to specify a virtual
   package as non-buildable without needing to specify for each
   implementation. See #14934

3. New config subcommands This release adds spack config add and
   spack config remove commands to add to and remove from yaml
   configuration files from the CLI. See #13920

4. Environment activation Anonymous environments are no longer
   automatically activated in the current working directory. To activate
   an environment from a spack.yaml file in the current directory, use
   the spack env activate . command. This removes a concern that users
   were too easily polluting their anonymous environments with accidental
   installations. See #17258

5. Apple clang compiler The clang compiler and the apple-clang
   compiler are now separate compilers in Spack. This allows Spack to
   improve support for the apple-clang compiler. See #17110

6. Finding external packages Spack packages can now support an API
   for finding external installations. This allows the spack external find command to automatically add installations of those packages to
   the user's configuration. See #15158

Additional new features of note

• support for using Spack with the fish shell (#9279)
• spack load --first option to load first match (instead of prompting user) (#15622)
• support the Cray cce compiler both new and classic versions (#17256, #12989)
• spack dev-build command:
  • supports stopping before a specified phase (#14699)
  • supports automatically launching a shell in the build environment (#14887)
• spack install --fail-fast allows builds to fail at the first error (rather than best-effort) (#15295)
• environments: SpecList references can be dereferenced as compiler or dependency constraints (#15245)
• spack view command: new support for a copy/relocate view type (#16480)
• ci pipelines: see documentation for several improvements
• spack mirror -a command now supports excluding packages (#14154)
• spack buildcache create is now environment-aware (#16580)
• module generation: more flexible format for specifying naming schemes (#16629)
• lmod module generation: packages can be configured as core specs for lmod hierarchy (#16517)

Deprecations and Removals

The following commands were deprecated in v0.13.0, and have now been removed:

• spack configure
• spack build
• spack diy

The following commands were deprecated in v0.14.0, and will be removed in the next major release:

• spack bootstrap

Bugfixes

Some of the most notable bugfixes in this release include:

• Spack environments can now contain the string -h (#15429)
• The spack install gracefully handles being backgrounded (#15723, #14682)
• Spack uses -isystem instead of -I in cases that the underlying build system does as well (#16077)
• Spack no longer prints any specs that cannot be safely copied into a Spack command (#16462)
• Incomplete Spack environments containing python no longer cause problems (#16473)
• Several improvements to binary package relocation

Package Improvements

The Spack project is constantly engaged in routine maintenance,
bugfixes, and improvements for the package ecosystem. Of particular
note in this release are the following:

• Spack now contains 4339 packages. There are 430 newly supported packages in v0.15.0
• GCC now builds properly on ARM architectures (#17280)
• Python: patched to support compiling mixed C/C++ python modules through distutils (#16856)
• improvements to pytorch and py-tensorflow packages
• improvements to major MPI implementations: mvapich2, mpich, openmpi, and others

Spack Project Management:

• Much of the Spack CI infrastructure has moved from Travis to GitHub Actions (#16610, #14220, #16345)
• All merges to the develop branch run E4S CI pipeline (#16338)
• New spack debug report command makes reporting bugs easier (#15834)