Erlang OTP 23.0-rc2 is available for testing

[Steve Vinoski]

Hi Kenneth, on Mar 24 there was an update to macOS Catalina, bringing it to
version 10.15.4, and also to XCode, bringing it to version 11.4. I updated
both yesterday. Under those versions, I've found that the git
tag OTP-23.0-rc2 fails to build due to the use of the -Wl,-no_weak_imports
linker flag. This flag is introduced in erts/configure.in:
https://github.com/erlang/otp/blob/master/erts/configure.in#L943-L957 and
the error from using it in the build is:

 LD /usr/local/src/otp/bin/x86_64-apple-darwin19.4.0/beam.smp
ld: weak import of symbol '___darwin_check_fd_set_overflow' not supported
because of option: -no_weak_imports for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)

If I comment out that case statement to prevent the use of that option, the
problem goes away and everything builds correctly. Note that
tag OTP-23.0-rc1, which built ok when it was released, now also fails the
same way with these updates.

--steve


On Wed, Mar 25, 2020 at 10:25 AM Kenneth Lundin <kenneth@REDACTED> wrote:

> OTP 23 Release Candidate 2
>
> This is the second of three planned release candidates before the OTP 23
> 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.
>
> Erlang/OTP 23 is a new major release with new features, improvements as
> well as a few incompatibilities.
> Potential Incompatibilities
>
>    - SSL:
>       - Support for SSL 3.0 is completely removed.
>       - TLS 1.3 is added to the list of default supported versions.
>    - erl_interface: Removed the deprecated parts of erl_interface
>    (erl_interface.h and essentially all C functions with prefix erl_).
>    - The deprecated erlang:get_stacktrace/0 BIF now returns an empty list
>    instead of a stacktrace.
>    erlang:get_stacktrace/0 is scheduled for removal in OTP 24.
>    - ...
>
> Highlights (rc2)
>
>    - ssh:
>       - OpenSSH 6.5 introduced a new file representation of
>       keys called openssh-key-v1. This is now supported with the
>       exception of
>       handling encrypted keys.
>       - Algorithm configuration could now be done in a .config file.
>       This is useful for example to enable an algorithm that
>       is disabled by default without need to change the code.
>    - ssl:
>       - Support for the middlebox compatibility mode makes the TLS 1.3
>       handshake
>       look more like a TLS 1.2 handshake and increases the chance of
>       successfully
>       establishing TLS 1.3 connections through legacy middleboxes.
>       - Add support for key exchange with Edward curves and PSS-RSA
>       padding in
>       signature verification
>    - The possibility to run Erlang distribution without
>    relying on EPMD has been extended. To achieve this a
>    couple of new options to the inet distribution has been
>    added.
>       - -dist_listen false Setup the distribution
>       channel, but do not listen for incoming connection.
>       - -erl_epmd_port Port Configure a default port that
>       the built-in EPMD client should return.
>       - ...
>    - A first EXPERIMENTAL socket backend to
>    gen_tcp and inet has been implemented. gen_udp and gen_sctp will
>    follow.
>    Putting {inet_backend, socket} as first option to listen() or connect() makes
>    it easy to try this for
>    existing code
>
> Highlights (rc1)
>
>    - A new module erpc in kernel which implements an enhanced subset of
>    the operations provided by the rpc module. Enhanced in the sense that
>    it makes it possible to distinguish between returned value, raised
>    exceptions and other errors. erpc also has better performance and
>    scalability than the original rpc implementation. This by utilizing
>    the newly introduced spawn_request() BIF. Also the rpc module benefits
>    from these improvements by utilizing erpc when possible.
>    - Scalability and performance Improvements plus new functionality
>    regarding distributed spawn operations.
>    - In binary matching, the size of the segment to be matched is now
>    allowed to be a guard expression (EEP-52)
>    - When matching with maps the keys can now be guard expressions
>    (EEP-52).
>    - ssh: support for TCP/IP port forwarding, a.k.a tunneling a.k.a as
>    tcp-forward/direct-tcp is implemented. In the OpenSSH client, this
>    corresponds to the options -L and -R.
>    - Allow underscores in numeric literals to improve readability.
>    Examples: 123_456_789, 16#1234_ABCD.
>    - New functions in the shell for displaying documentation for Erlang
>    modules, functions and types. The
>    functions are:
>       - h/1,2,3 -- Print the documentation for a Module:Function/Arity.
>       - ht/1,2,3 -- Print the type documentation for a Module:Type/Arity.
>       The embedded documentation is created as docchunks (EEP 48) when
>       building the Erlang/OTP documentation.
>    - kernel: The module pg with a new implementation of distributed named
>    process groups is introduced. The old module pg2 is deprecated and
>    scheduled for removal in OTP 24.
>    - Our tool chain for building the Windows packages is upgraded with
>    new C++ compiler, Java compiler, OpenSSL libraries and wxWidgets versions.
>    We are now using WSL (the Linux Subsystem for Windows when building) which
>    makes it easier to handle the build environment.
>    - ...
>
> For more details see
> http://erlang.org/download/otp_src_23.0-rc2.readme
>
> Pre built versions for Windows can be fetched here:
> http://erlang.org/download/otp_win32_23.0-rc2.exe
> http://erlang.org/download/otp_win64_23.0-rc2.exe
>
> Online documentation can be browsed here:
> http://erlang.org/documentation/doc-11.0-rc2/doc
> The Erlang/OTP source can also be found at GitHub on the official Erlang
> repository,
> https://github.com/erlang/otp
>
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