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author: Loïc Hoguin <[email protected]> 2017-10-03 13:39:41 +0200
committer: Loïc Hoguin <[email protected]> 2017-10-03 13:39:41 +0200
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+<h1 class="lined-header"><span>OTP version management</span></h1>
+
+<div class="paragraph"><p>Erlang.mk comes with integrated support for
+<a href="https://github.com/kerl/kerl">Kerl</a>, a shell script that
+automates the downloading, building and installing of
+Erlang/OTP. It can be used to easily build a specific
+Erlang/OTP version (with or without custom build options)
+or maintain different versions side by side.</p></div>
+<div class="sect1">
+<h2 id="_erlang_versions">Erlang versions</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Erlang.mk uses the Git tags from Erlang/OTP to identify
+OTP versions. The most recent tag at the time of writing
+is <code>OTP-20.0.4</code>, which is a patch release of <code>OTP-20.0</code>.
+A patch release is a non-official release containing a
+few fixes on top of the official release.</p></div>
+<div class="paragraph"><p>Older versions used a slightly different versioning scheme
+and tag format, for example: <code>OTP_R16B03</code>. Beware though,
+there also was an <code>OTP_R16B03-1</code> release that fixed a
+critical issue in the initial release.</p></div>
+<div class="paragraph"><p>The README file for all official Erlang/OTP releases can
+be found on <a href="http://www.erlang.org/downloads">erlang.org</a>.
+To obtain information about patch releases when they are
+released you need to be subscribed to the
+<a href="http://erlang.org/mailman/listinfo/erlang-questions">erlang-questions mailing list</a>.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="otp_version_pinning">OTP version pinning</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Erlang.mk can use a specific version of Erlang/OTP when
+interacting with your project. This can be very useful
+when you are working with a team because you can define
+the version you need in the Makefile and Erlang.mk will
+ensure this version is used by everyone in your team.</p></div>
+<div class="paragraph"><p>To pin the version all you need to do is to set the
+<code>ERLANG_OTP</code> variable in your Makefile before including
+Erlang.mk. For example, to use <code>OTP-20.0.4</code>:</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="color: #009900">ERLANG_OTP =</span> OTP-20.0.4
+
+include erlang.mk</tt></pre></div></div>
+<div class="paragraph"><p>The next time you run <code>make</code> Erlang.mk will build and
+use the version you configured.</p></div>
+<div class="paragraph"><p>Note that there has been reports that this functionality
+is not compatible with the <code>.ONESHELL</code> feature from
+GNU Make.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_continuous_integration">Continuous integration</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Erlang.mk can automatically test your project against
+many different Erlang/OTP versions. This functionality
+is documented in the <a href="../ci">Continuous integration</a> chapter.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_configuring_kerl">Configuring Kerl</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>All of the Kerl variables can be configured directly in the
+Makefile. All you need to do is to export them. For example,
+to change the installation directory for the Erlang/OTP
+versions managed by Kerl, you could add the following to
+your Makefile:</p></div>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">export</span></span> KERL_INSTALL_DIR <span style="color: #990000">=</span> <span style="color: #009900">$(CURDIR)</span>/erlang</tt></pre></div></div>
+<div class="paragraph"><p>When configuring paths like this, always make sure to provide
+an absolute path in the value. Erlang.mk will NOT expand them
+automatically for you.</p></div>
+</div>
+</div>
+
+
+
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+<h3>
+	Erlang.mk
+	1
+	
+	User Guide
+</h3>
+
+<ul>
+	
+	
+	
+</ul>
+
+<h4 id="docs-nav">Navigation</h4>
+
+<h4>Version select</h4>
+<ul>
+	
+	
+	
+		<li><a href="/docs/en/erlang.mk/1/guide">1</a></li>
+	
+</ul>
+
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author	Loïc Hoguin <[email protected]>	2017-10-03 13:39:41 +0200
committer	Loïc Hoguin <[email protected]>	2017-10-03 13:39:41 +0200
commit	b5d4cb91f80c833795a2d87050c3674bb7aecdc5 (patch)
tree	62bf0ad8326006fcd3407fcb7c34c844c0dc0874 /docs/en/erlang.mk/1/guide/kerl/index.html
parent	1f8d51dd2692fc3978080419987bbe4d49a41a90 (diff)
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