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<refentry xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>nix-build</refname>
<refpurpose>build a Nix expression</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>nix-build</command>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xpointer(/nop/*)" />
<arg><option>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg>
<arg>
<group choice='req'>
<arg choice='plain'><option>--attr</option></arg>
<arg choice='plain'><option>-A</option></arg>
</group>
<replaceable>attrPath</replaceable>
</arg>
<arg><option>--add-drv-link</option></arg>
<arg><option>--drv-link </option><replaceable>drvlink</replaceable></arg>
<arg><option>--no-out-link</option></arg>
<arg>
<group choice='req'>
<arg choice='plain'><option>--out-link</option></arg>
<arg choice='plain'><option>-o</option></arg>
</group>
<replaceable>outlink</replaceable>
</arg>
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsection><title>Description</title>
<para>The <command>nix-build</command> command builds the derivations
described by the Nix expressions in <replaceable>paths</replaceable>.
If the build succeeds, it places a symlink to the result in the
current directory. The symlink is called <filename>result</filename>.
If there are multiple Nix expressions, or the Nix expressions evaluate
to multiple derivations, multiple sequentially numbered symlinks are
created (<filename>result</filename>, <filename>result-2</filename>,
and so on).</para>
<para>If no <replaceable>paths</replaceable> are specified, then
<command>nix-build</command> will use <filename>default.nix</filename>
in the current directory, if it exists.</para>
<para><command>nix-build</command> is essentially a wrapper around
<link
linkend="sec-nix-instantiate"><command>nix-instantiate</command></link>
(to translate a high-level Nix expression to a low-level store
derivation) and <link
linkend="rsec-nix-store-realise"><command>nix-store
--realise</command></link> (to build the store derivation).</para>
<warning><para>The result of the build is automatically registered as
a root of the Nix garbage collector. This root disappears
automatically when the <filename>result</filename> symlink is deleted
or renamed. So don’t rename the symlink.</para></warning>
</refsection>
<refsection><title>Options</title>
<para>See also <xref linkend="sec-common-options" />. All options not
listed here are passed to <command>nix-store --realise</command>,
except for <option>--arg</option> and <option>--attr</option> /
<option>-A</option> which are passed to
<command>nix-instantiate</command>.</para>
<variablelist>
<varlistentry><term><option>--add-drv-link</option></term>
<listitem><para>Add a symlink in the current directory to the
store derivation produced by <command>nix-instantiate</command>.
The symlink is called <filename>derivation</filename> (which is
numbered in the case of multiple derivations). The derivation is
a root of the garbage collector until the symlink is deleted or
renamed.</para></listitem>
</varlistentry>
<varlistentry><term><option>--drv-link</option> <replaceable>drvlink</replaceable></term>
<listitem><para>Change the name of the symlink to the derivation
created when <option>--add-drv-link</option> is used from
<filename>derivation</filename> to
<replaceable>drvlink</replaceable>.</para></listitem>
</varlistentry>
<varlistentry><term><option>--no-out-link</option></term>
<listitem><para>Do not create a symlink to the output path. Note
that as a result the output does not become a root of the garbage
collector, and so might be deleted by <command>nix-store
--gc</command>.</para></listitem>
</varlistentry>
<varlistentry xml:id='opt-out-link'><term><option>--out-link</option> /
<option>-o</option> <replaceable>outlink</replaceable></term>
<listitem><para>Change the name of the symlink to the output path
created unless <option>--no-out-link</option> is used from
<filename>result</filename> to
<replaceable>outlink</replaceable>.</para></listitem>
</varlistentry>
</variablelist>
</refsection>
</refentry>
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