OTP 26.0-rc1 (Release Candidate 1) is released

[Henrik Nord X]

Erlang/OTP 26.0-rc1 is the first release candidate of three before the OTP 26.0 release.

The intention with this release is to get feedback from our users. All feedback is welcome, even if it is only to say that it works for you.
We encourage users to try it out and give us feedback either by creating an issue here https://github.com/erlang/otp/issues or by posting to Erlangforums<https://erlangforums.com/>.

All artifacts for the release can be downloaded from the Erlang/OTP Github<https://github.com/erlang/otp/releases/tag/OTP-26.0-rc1> release and you can view the new documentation at https://erlang.org/documentation/doc-14.0-rc1/doc/. You can also install the latest release using kerl<https://github.com/kerl/kerl> like this: kerl build 26.0-rc1 26.0-rc1.


Erlang/OTP 26 is a new major release with new features, improvements as well as a few incompatibilities. Some of the new features are highlighted below.

Many thanks to all contributors!

Below are some highlights of the release:

Highlights
The Shell

There are a lot of new features and improvements in the Erlang shell:

  *   auto-complete of variables, record names, record fields names, map keys, function parameter types and filenames.
  *   Open external editor in the shell to edit
the current expression.
  *   defining records (with types), functions, specs and types in the shell.

New terminal

  *   The TTY/terminal subsystem has been rewritten.
Windows users will notice that erl.exe has the same
functionality as a normal Unix shell and that werl.exe is just a
symlink to erl.exe. This makes the Windows Erlang terminal
experience identical to that of Unix.

Compiler and JIT optimizations:

  *   Creation and matching of binaries with segments of fixed sizes have been optimized.

  *   Creation and matching of UTF-8 segments have been optimized.

  *   Appending to binaries has been optimized.

  *   The compiler and JIT now generate better code for creation of small maps where all keys
are literals known at compile time.

  *   Thanks to the optimizations above the performance of the base64 module has been
significantly improved. For example, on an x86_64 system with the JIT both encode and
decode are almost three times faster than in Erlang/OTP 25.

Maps

  *   Map comprehensions as suggested in EEP 58<https://www.erlang.org/eeps/eep-0058> has now been
implemented.

  *   Some map operations have been optimized by changing the
internal sort order of atom keys. This changes the
(undocumented) order of how atom keys in small maps are
printed and returned by maps:to_list/1 and maps:next/1.
The new order is unpredictable and may change between
different invocations of the Erlang VM.

  *   Introducing the new function maps:iterator/2 for creating an interator
that return the map elements in a deterministic order.
There are also new modifiers k and K for the format
string in io:format() to support printing map elements
ordered.

Dialyzer

  *   Dialyzer has a new incremental mode that be invoked by
giving the --incremental option when running Dialyzer.
This new incremental mode is likely to become the
default in a future release.

Misc ERTS, Stdlib, Kernel, Compiler

  *   Multi time warp mode<https://www.erlang.org/doc/apps/erts/time_correction.html#time-warp-modes> is now enabled by default.
This assumes that all code executing on the system is
time warp safe<https://www.erlang.org/doc/apps/erts/time_correction.html#time-warp-safe-code>.

  *   Support for UTF-8 atoms and strings in the NIF
interface including new functions enif_make_new_atom,
enif_make_new_atom_len and enif_get_string_length.

  *   The BIFs min/2 and max/2 are now allowed to be used in
guards and match specs.

  *   Improved the selective receive optimization, which can
now be enabled for references returned from other
functions. This greatly improves the performance of
gen_server:send_request/3, gen_server:wait_response/2,
and similar functions.

  *   New trace feature call_memory. Similar to call_time
tracing, but instead of measure accumulated time in
traced functions it measures accumulated heap space
consumed by traced functions. It can be used to compare
how much different functions are contributing to
garbage collection being triggered.

  *   It is no longer necessary to enable a feature in the
runtime system in order to load modules that are using
it. It is sufficient to enable the feature in the
compiler when compiling it.

  *   inet:setopts/2 has got 3 new options: reuseport, reuseport_lb and exclusiveaddruse.

  *   Fix so that -fno-omit-frame-pointer is applied to all
of the Erlang VM when using the JIT so that tools, such
as perf, can crawl the process stacks.

  *   In the lists module, the zip family of functions now takes
options to allow handling lists of different lengths.

  *   Added the zip:zip_get_crc32/2 function to retrieve the
CRC32 checksum from an opened ZIP archive.
gen_server optimized by caching callback functions

  *   The modules Erlang DNS resolver inet_res and helper
modules have been updated for RFC6891; to handle OPT RR
with DNSSEC OK (DO) bit.

  *   Introduced application:get_supervisor/1.

  *   Cache OTP boot code paths, to limit how many folders
that are being accessed during a module lookup. Can be
disabled with -cache_boot_path false.

SSL

  *   Support for Kernel TLS (kTLS), has been added to the
SSL application, for TLS distribution (-proto_dist
inet_tls), the SSL option {ktls, true}.

  *   Improved error checking and handling of ssl options.

  *   Mitigate memory usage from large certificate chains by
lowering the maximum handshake size. This should not
effect the common cases, if needed it can be configured
to a higher value.

  *   For security reasons the SHA1 and DSA
algorithms are no longer among the default values.

  *   Add encoding and decoding of use_srtp hello extension
to facilitate for DTLS users to implement SRTP
functionality.

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