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[[ci]]
== Continuous integration
Erlang.mk comes with some support for continuous integration,
aimed at open source projects that need to support more than
one specific Erlang/OTP release. (If you target one specific
release, check the xref:otp_version_pinning[OTP version pinning]
section of the xref:kerl[OTP version management] chapter.)
=== Configuring Erlang/OTP versions to test
To use the CI plugin you must first configure which versions
of Erlang/OTP will be used. Erlang.mk provides three separate
configuration variables depending on whether you need a normal
OTP release, a HiPE-enabled release or an ErLLVM-enabled release.
At the time of writing, this is how you would test against all
the most recent patch releases of Erlang/OTP 19 and above:
[source,make]
CI_OTP = OTP-19.0.7 OTP-19.1.6 OTP-19.2.3 OTP-19.3.6.2 OTP-20.0.4
If you want to test against HiPE and ErLLVM but only with the
latest version of Erlang/OTP, the following could work:
[source,make]
CI_HIPE = $(lastword $(CI_OTP))
CI_ERLLVM = $(CI_HIPE)
Consult the xref:kerl[OTP version management] chapter for more
information about Erlang/OTP versions and customization of the
Erlang/OTP builds.
=== Running tests across all configured versions
The recommended way to run the `ci` target is with the option
`-k`. It will ensure that tests are run for all configured
Erlang/OTP versions, even if there are errors:
[source,bash]
$ make ci -k
=== Extending the CI targets
The `ci` target can be extended. For example to run Dialyzer
at the end of CI:
[source,make]
----
ci:: dialyze
----
Additional setup can be done by extending the `ci-setup`
target. This target is ran before testing each individual
Erlang/OTP version.
For example, to ensure dependencies are re-fetched/built
before testing individual Erlang/OTP releases:
[source,make]
----
ci-setup:: distclean
----
Similarly, the `ci-extra` target can be extended to run
extra commands after an Erlang/OTP version has been tested.
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