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Libraries or applications that support more than one major
release of OTP may need to use conditional compilation of
Erlang source code. Here are few examples where it would be
necessary or desirable:
* To support a new data type or language feature only available
in the latest major release (real-world examples: maps and the
stacktrace syntax).
* To avoid warnings for deprecated functions.
* To avoid dialyzer warnings.
Previously, to do conditional compilation, one would have to
use a parse transform or some external tool such as 'autoconf'.
To simplify conditional compilation, introduce the -if and -elif
preprocessor directives, to allow code like this to be written:
-if(?OTP_RELEASE =:= 21).
%% Code that will only work in OTP 21.
-else.
%% Fallback code.
-endif.
What kind of expressions should be allowed after an -if?
We certainly don't want to allow anything with a side effect,
such as a '!' or a 'receive'. We also don't want it to be
possible to call erlang:system_info/1, as that could make the
code depedent on features of the run-time system that could
change very easily (such as the number of schedulers).
Requiring the expression to be a guard expression makes most
sense. It is to explain in the documentation and easy for users
to understand. For simplicity of implementation, only a single
guard expression will be supported; that is, the ',' and ';' syntax
for guards is not supported.
To allow some useful conditions to be written, there is a special
built-in function:
defined(Symbol) tests whether the preprocessor symbol is defined,
just like -ifdef. The reason for having this defined/1 is that
the defined test can be combined with other tests, for example:
'defined(SOME_NAME) andalso ?OTP_RELEASE > 21'.
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Add a new pre-defined macro called OTP_RELEASE that will expand
to an integer being the OTP version. Thus, in OTP 19 the value will
be the integer 19.
The OTP_RELEASE macro is particularly useful in order to have
different source code depending on new language features or new
features in the type specification syntax. Those features are only
introduced in major versions of OTP.
To be truly useful, the -if preprocessor directive need to be
implemented. That is the purpose of the next commit.
Code that will need to work in both OTP 18 and OTP 19 can be
structured in the following way:
-ifdef(OTP_RELEASE).
%% Code that only works in OTP 19 and later.
-else.
%% Code that will work in OTP 18.
-endif.
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Move erl_types test into a common_test suite
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* john/kernel/add-file_int-to-release:
Add file_int.hrl to release target
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* ingela/ssl/testcuddling:
ssl: Exclude DTLS tests for one more OpenSSL version for now
ssl: Use sane input data
ssl: Make sure help function works from all parts of test suite
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* lukas/kernel/logger-docs:
Add xmllint to travis build
kernel: Use formatter in simple logger example
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* maint:
Updated OTP version
Update release notes
Update version numbers
ssl: Prepare for release
ssl: Proper handling of clients that choose to send an empty answer to a certificate request
heart: Use ntohs instead of manual conversion
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* maint-20:
Updated OTP version
Update release notes
Update version numbers
ssl: Prepare for release
ssl: Proper handling of clients that choose to send an empty answer to a certificate request
heart: Use ntohs instead of manual conversion
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* ingela/ssl/client-has-no-cert/ERL-599/OTP-15050:
ssl: Prepare for release
ssl: Proper handling of clients that choose to send an empty answer to a certificate request
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into maint-20
* john/erts/fix-heart-command-overflow/OTP-15034/ERIERL-166:
heart: Use ntohs instead of manual conversion
# Conflicts:
# lib/kernel/test/heart_SUITE.erl
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Depending on context trap_exit flag may be set or not.
So always set trap_exit and consume the EXIT signal and then set it back.
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This reverts commit 202bb737e3deabfebee683266f4b7c42781eb521.
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This reverts commit 345f7f527a4c26ef49cef0d81e2c8b71bf01ebc3.
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ECDH suite handling did not use the EC parameters form the certs
as expected.
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Fix test case code to use keyAgreement for ECDH_ECDSA
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Change-Id: Ia53fb6bbf0822608ce9f7afe9b905d3bb1ce0b11
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* ingela/dtls/abbreviated:
dtls: Trigger resend in abbreviated handshake if change_cipher_spec is received to early.
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is received to early.
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* bjorn/compiler/yreg-init:
beam_validator: Verify Y registers in exception-causing instructions
Correct beam_utils:is_killed/3 (again)
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Skip the test cases in the engine_SUITE on a specific ssl version
used on one test machine.
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All corba applications are moved to a separate repository.
E.g. orber, ic, cosEvent, cosEventDomain, cosNotifications
cosTime, cosTransactions, cosProperty and cosFileTransfer.
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* raimo/better-TLS-distribution/OTP-14969:
Fix distro CRL test cases short vs long names
Allow check for node name
Move check ip to before SSL handshake
Check client IP from server
Parse cert primarily for host names
Open for host and node allow list
Create plug-in for distro cert nodes
Rewrite TLS dist to handle node names in certs
Improve node allowed check
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Inets generated test data that not conform to valid TLS cipher suites
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* ingela/ssl/test-cuddle:
ssl: Handle EXIT messages from test code correctly
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* ingela/inets/httpc-error-handling/ERL-605/OTP-15042:
inets: Improve httpc gracefulness
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answer to a certificate request
Solves ERL-599
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When an exception is handled, the stack will be scanned. Therefore
all Y registers must be initialized.
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beam_utils:is_killed/3 could incorrectly indicate that a
register was killed.
The previous fix is 5da6b91ecab6c.
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* siri/kernel/logger/OTP-13295:
Add documentation of the built-in logger handlers
Catch badarg in logger:get_format_depth/0
Add chars_limit option to logger_formatter
Don't kill logger process until all other processes are dead
Set call timeout for logger_server to infinity
Update primary bootstrap
Test cuddle for logger
Update cth_log_redirect to a logger handler
Start using logger internally in kernel and stdlib
Remove error_logger process and add logger process
Add logger
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It is now explicitly stated that if the application type is `load`, the
application will not actually be restarted by the `restart_application`
instruction in relup, even if it is currently running. It will only be stopped
and re-loaded.
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* anders/diameter/21.0/OTP-15045:
vsn -> 2.1.5
Update appup for 21.0
Fix release note typo
Fix documentation typos
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This commit will make the close down sequence work as intended, and no
crash report will be generated. Alas such error corner cases are hard to
write automated test for.
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* hans/ssh/cuddle_tests:
ssh: Test case fix The daemon kill is now so fast that the clients does not react fast enough in ssh_sup_SUITE:killed_acceptor_restarts/1
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