source: general/genlib/js78.xml@ 50d9ed6

<?xml version="1.0" encoding="ISO-8859-1"?>
<!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 ff78-version       "&firefox-version;">
  <!ENTITY js78-download-http "&mozilla-http;/firefox/releases/&ff78-version;esr/source/firefox-&ff78-version;esr.source.tar.xz">
  <!ENTITY js78-download-ftp  " ">
  <!-- 78.2.0 -->
  <!ENTITY js78-md5sum        "e071f6c9bea8344d4556323f02bf6125">
  <!ENTITY js78-size          "317 MB">
  <!ENTITY js78-buildsize     "2.9 GB (30 MB installed after removing 31MB static lib)">
  <!ENTITY js78-time          "2.2 SBU (with parallelism = 4)">
]>

<sect1 id="js78" xreflabel="js78-&ff78-version;">
  <?dbhtml filename="js78.html"?>

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>JS-&ff78-version;</title>

  <indexterm zone="js78">
    <primary sortas="a-js78">js78</primary>
  </indexterm>

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

    <para>
      <application>JS</application> is Mozilla's JavaScript engine
      written in C. JS78 is taken from Firefox.
    </para>

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&js78-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url="&js78-download-ftp;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &js78-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &js78-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &js78-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &js78-time;
        </para>
      </listitem>
    </itemizedlist>
<!--    
    <bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Required patch:
          <ulink url="&patch-root;/js78-code_coverage-1.patch"/>
        </para>
      </listitem>
    </itemizedlist>
-->
    <bridgehead renderas="sect3">JS78 Dependencies</bridgehead>

    <bridgehead renderas="sect4">Required</bridgehead>
    <para role="required">
      <xref linkend="autoconf213"/>,
      <xref linkend="icu"/>,
      <xref linkend="rust"/>, and
      <xref linkend="which"/>
      <!-- Should we list llvm here? -->
    </para>

    <!-- It seems nasm is only used for aarch64-win64. -->
    <!--bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="nasm"/>
    </para-->

    <para condition="html" role="usernotes">
      User Notes: <ulink url="&blfs-wiki;/js78"/>
    </para>
  </sect2>

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

    <caution>
      <para>
        If you are upgrading JS78 from a previously installed old version,
        save all work and exit your GNOME Session if you have one running.
        Replacing the JS78 binary will cause the GNOME Shell to crash and
        return you to your display manager or TTY. After installing the new
        version, if GNOME Shell still doesn't work, reinstall
        <xref linkend="gjs"/>.
      </para>
    </caution>

    <note>
      <para>
        Unlike most other packages in BLFS, the instructions below require you
        to untar <filename>firefox-&ff78-version;esr.tar.xz</filename> and
        change into the <filename>firefox-&ff78-version;</filename> folder.
      </para>

      <para>
        Extracting the tarball
        will reset the permissions of the current directory to 0755 if you
        have permission to do that. If you do this in a directory where
        the sticky bit is set, such
        as <filename class="directory">/tmp</filename> it will end with error
        messages:
      </para>

<literallayout>tar: .: Cannot utime: Operation not permitted
tar: .: Cannot change mode to rwxr-xr-t: Operation not permitted
tar: Exiting with failure status due to previous errors
</literallayout>

      <para>
        This does finish with non-zero status, but it does
        <emphasis>NOT</emphasis> mean there is a real problem.
        Do not untar as the <systemitem class="username">root</systemitem> user
        in a directory where the sticky bit is set - that will unset it.
      </para>

    </note>

<!-- It's merged in 78.2.0.
    <para>
      Apply a patch required by <xref linkend="gjs"/>:
    </para>

<screen><userinput>patch -Np1 -i ../js78-code_coverage-1.patch</userinput></screen>
-->
    <para>
      Install <application>JS</application> by running the following
      commands:
    </para>

     <note>
        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
         href="../../xincludes/mozshm.xml"/>

        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
         href="../../xincludes/mozconfigure.xml"/>
     </note>


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

CC=gcc CXX=g++ \
../js/src/configure --prefix=/usr            \
                    --with-intl-api          \
                    --with-system-zlib       \
                    --with-system-icu        \
                    --disable-jemalloc       \
                    --disable-debug-symbols  \
                    --enable-readline        &amp;&amp;
make</userinput></screen>

    <para>
      <!-- All JIT tests pass with 78.2.0. -->
      To run JIT test suite, issue:
      <command>make -C js/src check-jit-test
      JITTEST_EXTRA_ARGS="--timeout 300"</command>.
      The other parts of test suite are not functional on BLFS.
    </para>

    <para>
      Now, as the <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>make install &amp;&amp;
rm -v /usr/lib/libjs_static.ajs &amp;&amp;
sed -i '/@NSPR_CFLAGS@/d' /usr/bin/js78-config</userinput></screen>

  </sect2>

  <!-- Several gjs-1.65.90 tests fail with js78.  Not sure why.
       OTOH an "otherwise" GNOME-3.36 environment works fine. -->

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

    <para>
      <envar>CC=gcc CXX=g++</envar>: Upstream now prefers
      <application>clang</application>, override it like other Mozilla
      packages in BLFS book.
    </para>

    <para>
      <parameter>--with-*</parameter>: These parameters allow the build system
      to use system versions of the above libraries. These are required for
      stability.
    </para>

    <para>
      <parameter>--enable-readline</parameter>: This switch enables Readline
      support in the JS shell.
    </para>
    
    <para>
      <parameter>--disable-jemalloc</parameter>: This switch disables the
      internal memory allocator used in JS78. jemalloc is only intended for
      the Firefox browser environment. For other applications using JS78,
      if JS78 uses jemalloc, the application may crash as items allocated
      in jemalloc allocator are freed on system (glibc) allocator.
    </para>

    <para>
      <parameter>--disable-debug-symbols</parameter>: Don't generate debug
      symbols since they are very large and most users won't need it. Remove
      it if you want to debug JS78.
    </para>

    <para>
      <command>rm -v /usr/lib/libjs_static.ajs</command>: Remove a large
      static library which is not used by any BLFS package.
    </para>

    <para>
      <command>sed -i '/@NSPR_CFLAGS@/d' /usr/bin/js78-config</command>:
      Prevent <command>js78-config</command> from using buggy CFLAGS.
    </para>

  </sect2>

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

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

      <seglistitem>
        <seg>
          js78 and js78-config
        </seg>
        <seg>
          libmozjs-78.so
        </seg>
        <seg>
          /usr/include/mozjs-78
        </seg>
      </seglistitem>
    </segmentedlist>

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

      <varlistentry id="js6-js78">
        <term><command>js78</command></term>
        <listitem>
          <para>
            provides a command line interface to the
            <application>JavaScript</application> engine.
          </para>
          <indexterm zone="js78 js78">
            <primary sortas="b-js78">js78</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="js78-config">
        <term><command>js78-config</command></term>
        <listitem>
          <para>
            is used to find the JS compiler and linker flags.
          </para>
          <indexterm zone="js78 js78-config">
            <primary sortas="b-js78-config">js78-config</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libmozjs-78">
        <term><filename class="libraryfile">libmozjs-78.so</filename></term>
        <listitem>
          <para>
            contains the Mozilla JavaScript API functions.
          </para>
          <indexterm zone="js78 libmozjs-78">
            <primary sortas="c-libmozjs78">libmozjs-78.so</primary>
          </indexterm>
        </listitem>
      </varlistentry>
    </variablelist>
  </sect2>
</sect1>