source: chapter08/ninja.xml@ 4640b37d

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  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
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<sect1 id="ch-system-ninja" role="wrap">
  <?dbhtml filename="ninja.html"?>

  <sect1info condition="script">
    <productname>ninja</productname>
    <productnumber>&ninja-version;</productnumber>
    <address>&ninja-url;</address>
  </sect1info>

  <title>Ninja-&ninja-version;</title>

  <indexterm zone="ch-system-ninja">
    <primary sortas="a-Ninja">Ninja</primary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <para>Ninja is a small build system with a focus on speed.</para>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&ninja-fin-sbu;</seg>
        <seg>&ninja-fin-du;</seg>
      </seglistitem>
    </segmentedlist>

    <tip revision="sysv">
      <para>This section is not strictly required when LFS does not use
      systemd. On the other hand, Ninja, along with Meson, makes
      a powerful build system combination,
      which will probably be used more and more often. It is required for
      several packages in <ulink url="&blfs-book;">the BLFS
      book</ulink>.</para>
    </tip>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Ninja</title>

    <para>When run, <command>ninja</command> normally utilizes the greatest
    possible number of processes in parallel.  By default this is the number of cores on the system,
    plus two.  This may overheat the CPU, or make the system run out
    of memory.  When <command>ninja</command> is invoked from the command line, passing the -jN parameter
    will limit the number of parallel processes. Some packages
    embed the execution of <command>ninja</command>, and do not pass the -j parameter on to it.</para>

    <para>Using the <emphasis>optional</emphasis> procedure below allows a user to
    limit the number of parallel processes via an environment variable,
    NINJAJOBS.  <emphasis role="bold">For example</emphasis>, setting:

    <screen>export NINJAJOBS=4</screen>

    will limit <command>ninja</command> to four parallel processes.</para>

    <para>If desired, make <command>ninja</command> recognize the environment variable
    NINJAJOBS by running the stream editor:</para>

<screen><userinput remap="pre">sed -i '/int Guess/a \
  int   j = 0;\
  char* jobs = getenv( "NINJAJOBS" );\
  if ( jobs != NULL ) j = atoi( jobs );\
  if ( j > 0 ) return j;\
' src/ninja.cc</userinput></screen>

    <para>Build Ninja with:</para>

<screen><userinput remap="configure">python3 configure.py --bootstrap</userinput></screen>

    <variablelist>
      <title>The meaning of the build option:</title>

      <varlistentry>
        <term><parameter>--bootstrap</parameter></term>
        <listitem>
          <para>This parameter forces Ninja to rebuild itself for the current
          system.</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>To test the results, issue:</para>

<screen><userinput remap="test">./ninja ninja_test
./ninja_test --gtest_filter=-SubprocessTest.SetWithLots</userinput></screen>

    <para>Install the package:</para>

<screen><userinput remap="install">install -vm755 ninja /usr/bin/
install -vDm644 misc/bash-completion /usr/share/bash-completion/completions/ninja
install -vDm644 misc/zsh-completion  /usr/share/zsh/site-functions/_ninja</userinput></screen>

  </sect2>

  <sect2 id="contents-ninja" role="content">
    <title>Contents of Ninja</title>

    <segmentedlist>
      <segtitle>Installed programs</segtitle>

      <seglistitem>
        <seg>ninja</seg>
      </seglistitem>
    </segmentedlist>
    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="ninja">
        <term><command>ninja</command></term>
        <listitem>
          <para>is the Ninja build system</para>
          <indexterm zone="ch-system-ninja ninja">
            <primary sortas="b-ninja">ninja</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>