[erlang-questions] Erlang/OTP 18.0-rc2 is available for testing

Jesper Louis Andersen <>
Wed May 13 15:04:34 CEST 2015


I'll just attach this here, but on my machine the BEAM emulator segfaults
under the build if passed the --enable-dirty-schedulers option:

git checkout -b t OTP-18.0-rc2
git clean -dfxq
./otp_build autoconf
./configure --enable-dirty-schedulers --prefix=/usr/local/stow/$(git
describe)
make -j 10

I had expected this to complete and give my an 'erl' with dirty schedulers
enabled, but once it gets into 'erlc' compiling it's first binary, the
command segfaults. Not passing --enable-dirty-schedulers works.

Is this confirmable by anyone else, just to rule out my machine from the
loop?


On Wed, May 13, 2015 at 1:48 PM, Kenneth Lundin <> wrote:

> Erlang/OTP 18.0-rc2 is available for testing.
>
> This is the second and last release candidate before the final OTP 18.0
> product release in June 2015.
>
> Between the 18.0 rc1 and 18.0 rc 2 and the final release there will be new
> updates of
> the master branch with corrections and minor new features.
> Occasionally there might be new tags which we in that
> case will communicate and ask you to test.
>
> Erlang/OTP 18.0 is a new major release with new features, quite a few
> (characteristics) improvements, as well as a few incompatibilities.
>
> See the Release Notes and the documentation for more details.
>
> We would like to ask you to build and test this release candidate and send
> us
> your feedback as soon as possible, so that we can make the necessary
> corrections before OTP 18.0.
>
> The release contains many changes; thus, some unexpected incompatibilities
> or issues may have slipped through our tests.
> Please try to build and run your current products/applications and let us
> know about any problems.
>
>
> *IMPORTANT INFO when building your own code with this OTP release*
> Since erlang:now is deprecated your build might stop if you are using
> "warnings as errors".
> To let the build through you can turn of warnings for deprecated functions
> by setting an environment variable like this:
>   export ERL_COMPILER_OPTIONS=nowarn_deprecated_function
>
> Some highlights of the release are:
>
>    - dialyzer: The -dialyzer() attribute can be used for suppressing
>    warnings
>    in a module by specifying functions or warning options.
>    It can also be used for requesting warnings in a module.
>    - erts: The time functionality has been extended. This includes a new
>    API for
>    time, as well as "time warp" modes which alters the behavior when
>    system time changes. You are strongly encouraged to use the new API instead
>    of the old API based on erlang:now/0. erlang:now/0 has been deprecated
>    since it will always be a scalability bottleneck.
>    For more information see the Time and Time Correction chapter of the
>    ERTS User's Guide. Here is a link
>    http://www.erlang.org/documentation/doc-7.0-rc2/erts-7.0/doc/html/time_correction.html
>    - erts: Beside the API changes and time warp modes a lot of
>    scalability and performance improvements regarding time management has been
>    made. Examples are:
>       - scheduler specific timer wheels,
>       - scheduler specific BIF timer management,
>       - parallel retrieval of monotonic time and system time on OS:es
>       that support it.
>    - erts: The previously introduced "eager check I/O" feature is now
>    enabled by default.
>    - erts/compiler: enhanced support for maps. Big maps new uses a HAMT
>    (Hash Array Mapped Trie) representation internally which makes them more
>    efficient. There is now also support for variables as map keys.
>    - ssl: Remove default support for SSL-3.0 and added padding check for
>    TLS-1.0 due to the Poodle vulnerability.
>    - ssl: Remove default support for RC4 cipher suites, as they are
>    consider too weak.
>    - stdlib: Allow maps for supervisor flags and child specs
>
>
> You can find the Release Notes with more detailed info at
>
>   http://www.erlang.org/download/OTP-18.0-rc2.README
>
> You find the source code at github.com in the official Erlang repository.
>
> Git tag OTP-18.0-rc2
>
> https://github.com/erlang/otp/tree/OTP-18.0-rc2
>
> You can also read the documentation on-line here:
> (see the Release Notes mentioned above for release notes which
> are not updated in the doc, but the new functionality is)
>
> http://www.erlang.org/documentation/doc-7.0-rc2/doc/
>
> We also want to thank those that sent us patches, suggestions and bug
> reports.
>
> The Erlang/OTP Team at Ericsson
>
> _______________________________________________
> erlang-questions mailing list
> 
> http://erlang.org/mailman/listinfo/erlang-questions
>
>


-- 
J.
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