This is the first important release to support OTP-21.0 officially, rather than just release candidates. There are some new features:
- upgrades to relx to 3.25.0 introduce support for OTP-21's 'sys.config.src' files, which allow automatic replacement of variables in sys.config files, without needing to use set
RELX_REPLACE_OS_VARS, and without having to wrap them in strings to work. It also contains a bunch of bugfixes. - Introduce support of
deloperations for overrides, which allow to unset specific values from lists such aserl_optsin dependencies - Add hooks to the upgrade command
- Add --start-clean flag to rebar3 shell
There are also plenty of bugfixes:
- Bump cth_readable for OTP-21 compat
- upgrade bbmustache to 1.5.0
- run compile provider in default namespace from bare compiler, fixing some build issues in mix builds
- Resolve string vs list crashing rebar3 erl_first_files
- Create ERLANG_LIB_*_erl_interface environment variables only if erl_interface exists
- Auto-boot main app in OTP app project templates
- Use maps for child spec example in templates