source: general/genlib/protobuf.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY protobuf-download-http "https://github.com/protocolbuffers/protobuf/releases/download/v&protobuf-version;/protobuf-&protobuf-version;.tar.gz">
  <!ENTITY protobuf-md5sum        "6ad6edec05fd08477a442db77dbebf98">
  <!ENTITY protobuf-size          "5.7 MB">
  <!ENTITY protobuf-buildsize     "89 MB">
  <!ENTITY protobuf-time          "1.3 SBU (with parallelism=4)">
]>

<sect1 id="protobuf" xreflabel="Protobuf-&protobuf-version;">
  <?dbhtml filename="protobuf.html"?>

  <title>Protobuf-&protobuf-version;</title>

  <indexterm zone="protobuf">
    <primary sortas="a-protobuf">Protobuf</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to Protobuf</title>

    <para>
      The <application>Protobuf</application> package contains utilities and
      libraries for using data in Google's data interchange format.
    </para>

    &lfs121_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&protobuf-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &protobuf-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &protobuf-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &protobuf-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &protobuf-time;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Protobuf Dependencies</bridgehead>

    <bridgehead renderas="sect4">Required</bridgehead>
    <para role="required">
      <xref linkend="abseil-cpp"/> and
      <xref linkend="cmake"/>
    </para>
    
    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <ulink url="https://github.com/google/googletest">gtest (for tests)</ulink>
    </para>

  </sect2>

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

    <para>
      Install <application>Protobuf</application> by running the following
      commands:
    </para>

<screen><userinput>mkdir build &amp;&amp;
cd    build &amp;&amp;

cmake -DCMAKE_INSTALL_PREFIX=/usr      \
      -DCMAKE_BUILD_TYPE=Release       \
      -Dprotobuf_BUILD_TESTS=OFF       \
      -Dprotobuf_ABSL_PROVIDER=package \
      -Dprotobuf_BUILD_SHARED_LIBS=ON  \
      -Dutf8_range_ENABLE_INSTALL=OFF  \
      -G Ninja ..                      &amp;&amp;
ninja</userinput></screen>

    <para>
      This package does come with a test suite, but it requires
      <ulink url="https://github.com/google/googletest">gtest</ulink>, which
      is not part of BLFS.
    </para>

    <para>
      Now, as the &root; user:
    </para>

<screen role="root"><userinput>sed 's/utf8_range//' -i *.pc &amp;&amp;
ninja install</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para>
      <command>sed 's/utf8_range//' -i *.pc</command>: This command removes a
      leftover reference to libutf8_range from the pkg-config files installed
      by this package.
    </para>

    <para>
      <parameter>-Dprotobuf_BUILD_TESTS=OFF</parameter>: This parameter prevents
      the tests from being built because
      <ulink url="https://github.com/google/googletest">gtest</ulink> is not
      part of BLFS.
    </para>

    <para>
      <parameter>-Dprotobuf_ABSL_PROVIDER=package</parameter>: This parameter
      allows the build system to use the system-installed copy of
      <xref linkend="abseil-cpp" role="nodep"/>.
    </para>

    <para>
      <parameter>-Dprotobuf_BUILD_SHARED_LIBS=ON</parameter>: This parameter
      enables building shared versions of the libraries provided by this package
      instead of static versions.
    </para>

    <para>
      <parameter>-Dutf8_range_ENABLE_INSTALL=OFF</parameter>: This parameter
      disables installing the utf8_range static library.  The functions
      provided by this library and used by protobuf is already embedded into
      <filename class='libraryfile'>libprotobuf.so</filename>, so installing
      a full copy of the static library is just wasting the disk space.
    </para>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>
          protoc-26.1.0 and protoc (a symlink to protoc-26.1.0)
        </seg>
        <seg>
          libprotobuf.so,
          libprotobuf-lite.so, and
          libprotoc.so
        </seg>
        <seg>
          /usr/include/google,
          /usr/include/java,
          /usr/include/upb_generator, and
          /usr/lib/cmake/protobuf
        </seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="protoc">
        <term><command>protoc</command></term>
        <listitem>
          <para>
            parses protocol buffer files and generates output for several
            programming languages and formats
          </para>
          <indexterm zone="protobuf protoc">
            <primary sortas="b-protoc">protoc</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libprotobuf">
        <term><filename class="libraryfile">libprotobuf.so</filename></term>
        <listitem>
          <para>
            contains functions for utilizing data in Google's data interchange
            format
          </para>
          <indexterm zone="protobuf libprotobuf">
            <primary sortas="c-libprotobuf">libprotobuf.so</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libprotobuf-lite">
        <term><filename class="libraryfile">libprotobuf-lite.so</filename></term>
        <listitem>
          <para>
            contains a simpler version of the functions for utilizing data in
            Google's data interchange format
          </para>
          <indexterm zone="protobuf libprotobuf-lite">
            <primary sortas="c-libprotobuf-lite">libprotobuf-lite.so</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libprotoc">
        <term><filename class="libraryfile">libprotoc.so</filename></term>
        <listitem>
          <para>
            contains functions used by protoc at runtime for outputting data
            for several programming languages and formats
          </para>
          <indexterm zone="protobuf libprotoc">
            <primary sortas="c-libprotoc">libprotoc.so</primary>
          </indexterm>
        </listitem>
      </varlistentry>
    </variablelist>
  </sect2>
</sect1>