lfs-book/chapter08/ninja.xml

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  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
  %general-entities;
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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 for LFS if not using
      systemd. On the other hand, ninja associated to meson makes
      a powerful build system combination,
      which is expected to 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, ninja normally runs a maximum number of processes
    in parallel.  By default this is the number of cores on the system 
    plus two.  In some cases this can overheat a CPU or run a system out
    of memory.  If run from the command line, passing a -jN parameter
    will limit the number of parallel processes, but some packages
    embed the execution of ninja and do not pass a -j parameter.</para>

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

     <!--Using <command> here to make the output bold.  We really don't want
     users setting this now and experience shows that many users blindly
     copy/paste anything in a box. -->

    <screen>export NINJAJOBS=4</screen>

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

    <para>If desired, add the capability to use the environment variable 
    NINJAJOBS by running:</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>