| 1 | <?xml version="1.0" encoding="UTF-8"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-tools-glibc" role="wrap">
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| 9 | <?dbhtml filename="glibc.html"?>
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| 10 |
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| 11 | <sect1info condition="script">
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| 12 | <productname>glibc</productname>
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| 13 | <productnumber>&glibc-version;</productnumber>
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| 14 | <address>&glibc-url;</address>
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| 15 | </sect1info>
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| 16 |
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| 17 | <title>Glibc-&glibc-version;</title>
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| 18 |
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| 19 | <indexterm zone="ch-tools-glibc">
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| 20 | <primary sortas="a-Glibc">Glibc</primary>
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| 21 | <secondary>tools</secondary>
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| 22 | </indexterm>
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| 23 |
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| 24 | <sect2 role="package">
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| 25 | <title/>
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| 26 |
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| 27 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 28 | href="../chapter08/glibc.xml"
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| 29 | xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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| 30 |
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| 31 | <segmentedlist>
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| 32 | <segtitle>&buildtime;</segtitle>
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| 33 | <segtitle>&diskspace;</segtitle>
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| 34 |
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| 35 | <seglistitem>
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| 36 | <seg>&glibc-tmp-sbu;</seg>
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| 37 | <seg>&glibc-tmp-du;</seg>
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| 38 | </seglistitem>
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| 39 | </segmentedlist>
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| 40 |
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| 41 | </sect2>
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| 42 |
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| 43 | <sect2 role="installation">
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| 44 | <title>Installation of Glibc</title>
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| 45 |
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| 46 | <para>First, create a symbolic link for LSB compliance. Additionally,
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| 47 | for x86_64, create a compatibility symbolic link required for proper
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| 48 | operation of the dynamic library loader:</para>
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| 49 |
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| 50 | <screen arch="default"><userinput remap="pre">case "$LFS_TGT" in
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| 51 | i?86-*) ln -sfv ld-linux.so.2 $LFS/lib/ld-lsb.so.3
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| 52 | ;;
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| 53 | x86_64-*) ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
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| 54 | ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3
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| 55 | ;;
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| 56 | esac</userinput></screen>
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| 57 | <!-- no ld-linux.so.2 here as multilib is based on x86_64, not on i686 -->
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| 58 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
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| 59 | ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3</userinput></screen>
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| 60 |
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| 61 | <note>
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| 62 | <para>
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| 63 | The above command is correct. The <command>ln</command> command has
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| 64 | several syntactic versions, so be sure to check
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| 65 | <command>info coreutils ln</command> and <ulink role='man'
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| 66 | url='&man;ln.1'>ln(1)</ulink> before reporting what may appear to be
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| 67 | an error.
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| 68 | </para>
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| 69 | </note>
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| 70 |
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| 71 | <para>Some of the Glibc programs use the non-FHS-compliant
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| 72 | <filename class="directory">/var/db</filename> directory to store their
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| 73 | runtime data. Apply the following patch to make such programs store their
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| 74 | runtime data in the FHS-compliant locations:</para>
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| 75 |
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| 76 | <screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
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| 77 |
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| 78 | <para>The Glibc documentation recommends building Glibc
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| 79 | in a dedicated build directory:</para>
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| 80 |
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| 81 | <screen><userinput remap="pre">mkdir -v build
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| 82 | cd build</userinput></screen>
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| 83 |
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| 84 | <para>Ensure that the <command>ldconfig</command> and <command>sln</command>
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| 85 | utilities are installed into
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| 86 | <filename class="directory">/usr/sbin</filename>:</para>
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| 87 |
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| 88 | <screen><userinput remap="pre">echo "rootsbindir=/usr/sbin" > configparms</userinput></screen>
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| 89 |
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| 90 | <para>Next, prepare Glibc for compilation:</para>
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| 91 |
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| 92 | <screen><userinput remap="configure">../configure \
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| 93 | --prefix=/usr \
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| 94 | --host=$LFS_TGT \
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| 95 | --build=$(../scripts/config.guess) \
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| 96 | --enable-kernel=&min-kernel; \
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| 97 | --with-headers=$LFS/usr/include \
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| 98 | --disable-nscd \
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| 99 | libc_cv_slibdir=/usr/lib</userinput></screen>
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| 100 |
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| 101 | <variablelist>
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| 102 | <title>The meaning of the configure options:</title>
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| 103 |
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| 104 | <varlistentry>
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| 105 | <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
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| 106 | <listitem>
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| 107 | <para>The combined effect of these switches is that Glibc's build system
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| 108 | configures itself to be cross-compiled, using the cross-linker and
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| 109 | cross-compiler in <filename class="directory">$LFS/tools</filename>.</para>
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| 110 | </listitem>
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| 111 | </varlistentry>
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| 112 |
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| 113 | <varlistentry>
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| 114 | <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
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| 115 | <listitem>
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| 116 | <para>This tells Glibc to compile the library with support
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| 117 | for &min-kernel; and later Linux kernels. Workarounds for older
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| 118 | kernels are not enabled.</para>
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| 119 | </listitem>
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| 120 | </varlistentry>
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| 121 |
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| 122 | <varlistentry>
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| 123 | <term><parameter>--with-headers=$LFS/usr/include</parameter></term>
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| 124 | <listitem>
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| 125 | <para>This tells Glibc to compile itself against the headers
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| 126 | recently installed to the $LFS/usr/include directory, so that
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| 127 | it knows exactly what features the kernel has and can optimize
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| 128 | itself accordingly.</para>
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| 129 | </listitem>
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| 130 | </varlistentry>
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| 131 |
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| 132 | <varlistentry>
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| 133 | <term><parameter>libc_cv_slibdir=/usr/lib</parameter></term>
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| 134 | <listitem>
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| 135 | <para>This ensures that the library is installed in /usr/lib instead
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| 136 | of the default /lib64 on 64-bit machines.</para>
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| 137 | </listitem>
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| 138 | </varlistentry>
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| 139 |
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| 140 | <varlistentry>
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| 141 | <term><parameter>--disable-nscd</parameter></term>
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| 142 | <listitem>
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| 143 | <para>Do not build the name service cache daemon which is no
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| 144 | longer used.</para>
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| 145 | </listitem>
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| 146 | </varlistentry>
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| 147 |
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| 148 | </variablelist>
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| 149 |
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| 150 | <para>During this stage the following warning might appear:</para>
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| 151 |
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| 152 | <blockquote>
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| 153 | <screen><computeroutput>configure: WARNING:
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| 154 | *** These auxiliary programs are missing or
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| 155 | *** incompatible versions: msgfmt
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| 156 | *** some features will be disabled.
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| 157 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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| 158 | </blockquote>
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| 159 |
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| 160 | <para>The missing or incompatible <command>msgfmt</command> program is
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| 161 | generally harmless. This <command>msgfmt</command> program is part of the
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| 162 | Gettext package, which the host distribution should provide.</para>
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| 163 |
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| 164 | <note><para>There have been reports that this package may fail when
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| 165 | building as a <quote>parallel make.</quote> If that occurs, rerun the make command
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| 166 | with the <option>-j1</option> option.</para></note>
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| 167 |
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| 168 | <para>Compile the package:</para>
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| 169 |
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| 170 | <screen><userinput remap="make">make</userinput></screen>
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| 171 |
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| 172 | <para>Install the package:</para>
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| 173 |
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| 174 | <warning><para>If <envar>LFS</envar> is not properly set, and despite the
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| 175 | recommendations, you are building as
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| 176 | <systemitem class="username">root</systemitem>, the next command will
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| 177 | install the newly built Glibc to your host system, which will almost
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| 178 | certainly render it unusable. So double-check that the environment is
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| 179 | correctly set, and that you are not &root;, before running the following command.</para></warning>
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| 180 |
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| 181 | <screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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| 182 |
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| 183 | <variablelist>
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| 184 | <title>The meaning of the <command>make install</command> option:</title>
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| 185 |
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| 186 | <varlistentry>
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| 187 | <term><parameter>DESTDIR=$LFS</parameter></term>
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| 188 | <listitem>
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| 189 | <para>The <envar>DESTDIR</envar> make variable is used by almost all
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| 190 | packages to define the location where the package should be
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| 191 | installed. If it is not set, it defaults to the root (<filename
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| 192 | class="directory">/</filename>) directory. Here we specify that
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| 193 | the package is installed in <filename class="directory">$LFS
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| 194 | </filename>, which will become the root directory in <xref linkend=
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| 195 | "ch-tools-chroot"/>.</para>
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| 196 | </listitem>
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| 197 | </varlistentry>
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| 198 |
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| 199 | </variablelist>
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| 200 |
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| 201 | <para>Fix a hard coded path to the executable loader in the
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| 202 | <command>ldd</command> script:</para>
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| 203 |
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| 204 | <screen><userinput remap="install">sed '/RTLDLIST=/s@/usr@@g' -i $LFS/usr/bin/ldd</userinput></screen>
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| 205 |
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| 206 | <caution>
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| 207 | <para>At this point, it is imperative to stop and ensure that the basic
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| 208 | functions (compiling and linking) of the new toolchain are working as
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| 209 | expected. To perform a sanity check, run the following commands:</para>
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| 210 |
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| 211 | <screen><userinput>echo 'int main(){}' | $LFS_TGT-gcc -xc -
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| 212 | readelf -l a.out | grep ld-linux</userinput></screen>
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| 213 |
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| 214 | <para>If everything is working correctly, there should be no errors,
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| 215 | and the output of the last command will be of the form:</para>
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| 216 |
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| 217 | <screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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| 218 |
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| 219 | <para arch="default">Note that for 32-bit machines, the interpreter name will be
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| 220 | <filename>/lib/ld-linux.so.2</filename>.</para>
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| 221 |
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| 222 | <para>If the output is not as shown above, or there is no output at all,
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| 223 | then something is wrong. Investigate and retrace the steps to find out
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| 224 | where the problem is and correct it. This issue must be resolved before
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| 225 | continuing.</para>
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| 226 |
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| 227 | <para>Once all is well, clean up the test file:</para>
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| 228 |
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| 229 | <screen><userinput>rm -v a.out</userinput></screen>
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| 230 |
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| 231 | </caution>
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| 232 |
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| 233 | <note><para>Building the packages in the next chapter will serve as an
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| 234 | additional check that the toolchain has been built properly. If some
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| 235 | package, especially Binutils-pass2 or GCC-pass2, fails to build, it is
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| 236 | an indication that something has gone wrong with the
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| 237 | preceding Binutils, GCC, or Glibc installations.</para></note>
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| 238 | <!--
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| 239 | <para>Now that our cross-toolchain is complete, finalize the installation
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| 240 | of the limits.h header. To do this, run a utility provided by the GCC
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| 241 | developers:</para>
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| 242 |
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| 243 | <screen><userinput>$LFS/tools/libexec/gcc/$LFS_TGT/&gcc-version;/install-tools/mkheaders</userinput></screen>
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| 244 | -->
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| 245 | </sect2>
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| 246 |
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| 247 | <!-- - - - - - - - - - -->
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| 248 | <!-- Multilib - 32bit -->
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| 249 | <!-- - - - - - - - - - -->
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| 250 | <sect2 arch="ml_32,ml_all">
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| 251 | <title>Building Glibc - 32bit</title>
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| 252 |
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| 253 | <para>Now recompile for m32. The extracted source can be
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| 254 | reused but needs to be cleaned before installing the m32
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| 255 | version of Glibc.</para>
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| 256 |
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| 257 | <para>Clear the build directory and remove artefacts from
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| 258 | previous build:</para>
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| 259 |
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| 260 | <screen><userinput remap="pre">make clean
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| 261 | find .. -name "*.a" -delete</userinput></screen>
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| 262 |
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| 263 | <para>Configure Glibc for m32 with the following commands:</para>
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| 264 |
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| 265 | <screen><userinput remap="configure">CC="$LFS_TGT-gcc -m32" \
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| 266 | CXX="$LFS_TGT-g++ -m32" \
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| 267 | ../configure \
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| 268 | --prefix=/usr \
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| 269 | --host=$LFS_TGT32 \
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| 270 | --build=$(../scripts/config.guess) \
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| 271 | --enable-kernel=&min-kernel; \
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| 272 | --with-headers=$LFS/usr/include \
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| 273 | --disable-nscd \
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| 274 | --libdir=/usr/lib32 \
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| 275 | --libexecdir=/usr/lib32 \
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| 276 | libc_cv_slibdir=/usr/lib32</userinput></screen>
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| 277 |
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| 278 | <para>Compile the package:</para>
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| 279 |
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| 280 | <screen><userinput remap="make">make</userinput></screen>
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| 281 |
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| 282 | <para>Install the package:</para>
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| 283 |
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| 284 | <screen><userinput remap="install">make DESTDIR=$PWD/DESTDIR install
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| 285 | cp -a DESTDIR/usr/lib32 $LFS/usr/
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| 286 | install -vm644 DESTDIR/usr/include/gnu/{lib-names,stubs}-32.h \
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| 287 | $LFS/usr/include/gnu/
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| 288 | ln -svf ../lib32/ld-linux.so.2 $LFS/lib/ld-linux.so.2</userinput></screen>
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| 289 |
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| 290 |
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| 291 | <caution>
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| 292 | <para>At this point, it is imperative to stop and ensure that the basic
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| 293 | functions (compiling and linking) of the new toolchain are working as
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| 294 | expected. To perform a sanity check, run the following commands:</para>
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| 295 |
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| 296 | <screen><userinput>echo 'int main(){}' > dummy.c
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| 297 | $LFS_TGT-gcc -m32 dummy.c
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| 298 | readelf -l a.out | grep '/ld-linux'</userinput></screen>
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| 299 |
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| 300 | <para>If everything is working correctly, there should be no errors,
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| 301 | and the output of the last command will be of the form:</para>
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| 302 |
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| 303 | <screen><computeroutput>[Requesting program interpreter: /lib/ld-linux.so.2]</computeroutput></screen>
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| 304 |
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| 305 | <para>If the output is not shown as above or there was no output at all,
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| 306 | then something is wrong. Investigate and retrace the steps to find out
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| 307 | where the problem is and correct it. This issue must be resolved before
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| 308 | continuing on.</para>
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| 309 |
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| 310 | <para>Once all is well, clean up the test files:</para>
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| 311 |
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| 312 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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| 313 |
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| 314 | </caution>
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| 315 |
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| 316 | </sect2><!-- m32 -->
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| 317 |
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| 318 | <!-- - - - - - - - - - -->
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| 319 | <!-- Multilib - x32bit -->
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| 320 | <!-- - - - - - - - - - -->
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| 321 |
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| 322 | <sect2 arch="ml_x32,ml_all">
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| 323 | <title>Building Glibc - x32bit</title>
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| 324 |
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| 325 | <para>Now recompile for mx32. The extracted source can be
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| 326 | reused but needs to be cleaned before installing the mx32
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| 327 | version of Glibc.</para>
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| 328 |
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| 329 | <para>Clear the build directory and remove artefacts from
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| 330 | previous build:</para>
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| 331 |
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| 332 | <screen><userinput remap="pre">make clean
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| 333 | find .. -name "*.a" -delete</userinput></screen>
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| 334 |
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| 335 | <para>Configure Glibc for mx32 with the following commands:</para>
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| 336 |
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| 337 | <screen><userinput remap="configure">CC="$LFS_TGT-gcc -mx32" \
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| 338 | CXX="$LFS_TGT-g++ -mx32" \
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| 339 | ../configure \
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| 340 | --prefix=/usr \
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| 341 | --host=$LFS_TGTX32 \
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| 342 | --build=$(../scripts/config.guess) \
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| 343 | --enable-kernel=&min-kernel; \
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| 344 | --with-headers=$LFS/usr/include \
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| 345 | --disable-nscd \
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| 346 | --libdir=/usr/libx32 \
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| 347 | --libexecdir=/usr/libx32 \
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| 348 | libc_cv_slibdir=/usr/libx32</userinput></screen>
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| 349 |
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| 350 | <para>Compile the package:</para>
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| 351 |
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| 352 | <screen><userinput remap="make">make</userinput></screen>
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| 353 |
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| 354 | <para>Install the package:</para>
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| 355 |
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| 356 | <screen><userinput remap="install">make DESTDIR=$PWD/DESTDIR install
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| 357 | cp -a DESTDIR/usr/libx32 $LFS/usr/
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| 358 | install -vm644 DESTDIR/usr/include/gnu/{lib-names,stubs}-x32.h \
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| 359 | $LFS/usr/include/gnu/
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| 360 | ln -svf ../libx32/ld-linux-x32.so.2 $LFS/lib/ld-linux-x32.so.2</userinput></screen>
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| 361 |
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| 362 | <caution>
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| 363 | <para>At this point, it is imperative to stop and ensure that the basic
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| 364 | functions (compiling and linking) of the new toolchain are working as
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| 365 | expected. To perform a sanity check, run the following commands:</para>
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| 366 |
|
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| 367 | <screen><userinput>echo 'int main(){}' > dummy.c
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| 368 | $LFS_TGT-gcc -mx32 dummy.c
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| 369 | readelf -l a.out | grep '/ld-linux-x32'</userinput></screen>
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| 370 |
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| 371 | <para>If everything is working correctly, there should be no errors,
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| 372 | and the output of the last command will be of the form:</para>
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| 373 |
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| 374 | <screen><computeroutput>[Requesting program interpreter: /libx32/ld-linux-x32.so.2]</computeroutput></screen>
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| 375 |
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| 376 | <para>If the output is not shown as above or there was no output at all,
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| 377 | then something is wrong. Investigate and retrace the steps to find out
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| 378 | where the problem is and correct it. This issue must be resolved before
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| 379 | continuing on.</para>
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| 380 |
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| 381 | <para>Once all is well, clean up the test files:</para>
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| 382 |
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| 383 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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| 384 |
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| 385 | </caution>
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| 386 |
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| 387 | </sect2><!-- mx32 -->
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| 388 |
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| 389 | <sect2 role="content">
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| 390 | <title/>
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| 391 |
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| 392 | <para>Details on this package are located in
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| 393 | <xref linkend="contents-glibc" role="."/></para>
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| 394 |
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| 395 | </sect2>
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| 396 |
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| 397 | </sect1>
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