[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[b06ca36] | 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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[673b0d8] | 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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[1f7ca93] | 7 |
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[9652249] | 8 | <sect1 id="ch-tools-glibc" role="wrap">
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[1f7ca93] | 9 | <?dbhtml filename="glibc.html"?>
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| 10 |
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[e747759] | 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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[1f7ca93] | 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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[bc82645e] | 26 |
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[d9441360] | 27 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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[fcc02767] | 28 | href="../chapter08/glibc.xml"
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[1f7ca93] | 29 | xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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[81fd230] | 30 |
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[1f7ca93] | 31 | <segmentedlist>
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| 32 | <segtitle>&buildtime;</segtitle>
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| 33 | <segtitle>&diskspace;</segtitle>
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[673b0d8] | 34 |
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[1f7ca93] | 35 | <seglistitem>
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[fb386e0] | 36 | <seg>&glibc-tmp-sbu;</seg>
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| 37 | <seg>&glibc-tmp-du;</seg>
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[1f7ca93] | 38 | </seglistitem>
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| 39 | </segmentedlist>
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[673b0d8] | 40 |
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[1f7ca93] | 41 | </sect2>
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[73aedd1d] | 42 |
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[1f7ca93] | 43 | <sect2 role="installation">
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| 44 | <title>Installation of Glibc</title>
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[6fc168b] | 45 |
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[efcb393] | 46 | <para>First, create two symbolic links, which are needed for proper
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| 47 | operation of the dynamic library loader:</para>
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| 48 |
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| 49 | <screen><userinput remap="pre">ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
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| 50 | ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3</userinput></screen>
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| 51 |
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| 52 | <para>Some of the Glibc programs use the non-FHS compliant
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| 53 | <filename class="directory">/var/db</filename> directory to store their
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| 54 | runtime data. Apply the following patch to make such programs store their
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| 55 | runtime data in the FHS-compliant locations:</para>
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| 56 |
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| 57 | <screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
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| 58 |
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[f1dd547] | 59 | <para>The Glibc documentation recommends building Glibc
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| 60 | in a dedicated build directory:</para>
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[9bda40d] | 61 |
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[f1dd547] | 62 | <screen><userinput remap="pre">mkdir -v build
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| 63 | cd build</userinput></screen>
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[f1c177f] | 64 |
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[1f7ca93] | 65 | <para>Next, prepare Glibc for compilation:</para>
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[73aedd1d] | 66 |
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[63df8c7] | 67 | <screen><userinput remap="configure">../configure \
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[efcb393] | 68 | --prefix=/usr \
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[63df8c7] | 69 | --host=$LFS_TGT \
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| 70 | --build=$(../scripts/config.guess) \
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[c10c983] | 71 | --enable-kernel=&min-kernel; \
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[efcb393] | 72 | --with-headers=$LFS/usr/include \
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| 73 | libc_cv_slibdir=/lib</userinput></screen>
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[c10c983] | 74 | <!--
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[63df8c7] | 75 | libc_cv_forced_unwind=yes \
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[c10c983] | 76 | libc_cv_c_cleanup=yes</userinput></screen> -->
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[73aedd1d] | 77 |
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[1f7ca93] | 78 | <variablelist>
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| 79 | <title>The meaning of the configure options:</title>
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| 80 |
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[4e82d47] | 81 | <varlistentry>
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[418b038] | 82 | <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
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[4e82d47] | 83 | <listitem>
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| 84 | <para>The combined effect of these switches is that Glibc's build system
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[efcb393] | 85 | configures itself to be cross-compiled, using the cross-linker and
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[4e82d47] | 86 | cross-compiler in <filename class="directory">/tools</filename>.</para>
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| 87 | </listitem>
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| 88 | </varlistentry>
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[1118b17] | 89 |
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[1f7ca93] | 90 | <varlistentry>
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[70cd9f32] | 91 | <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
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[1f7ca93] | 92 | <listitem>
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| 93 | <para>This tells Glibc to compile the library with support
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[70cd9f32] | 94 | for &min-kernel; and later Linux kernels. Workarounds for older
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[3532721] | 95 | kernels are not enabled.</para>
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[1f7ca93] | 96 | </listitem>
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| 97 | </varlistentry>
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[1118b17] | 98 |
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[1f7ca93] | 99 | <varlistentry>
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[efcb393] | 100 | <term><parameter>--with-headers=$LFS/usr/include</parameter></term>
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[1f7ca93] | 101 | <listitem>
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[77d2cd8d] | 102 | <para>This tells Glibc to compile itself against the headers
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| 103 | recently installed to the $LFS/usr/include directory, so that
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| 104 | it knows exactly what features the kernel has and can optimize
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| 105 | itself accordingly.</para>
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[1f7ca93] | 106 | </listitem>
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| 107 | </varlistentry>
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[efcb393] | 108 |
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[1f7ca93] | 109 | <varlistentry>
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[efcb393] | 110 | <term><parameter>libc_cv_slibdir=/lib</parameter></term>
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[1f7ca93] | 111 | <listitem>
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[efcb393] | 112 | <para>This ensures that the library is installed in /lib instead
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| 113 | of the default /lib64 on 64 bit machines.</para>
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[4e82d47] | 114 | </listitem>
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| 115 | </varlistentry>
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[1f7ca93] | 116 |
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| 117 | </variablelist>
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| 118 |
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| 119 | <para>During this stage the following warning might appear:</para>
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| 120 |
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| 121 | <blockquote>
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| 122 | <screen><computeroutput>configure: WARNING:
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| 123 | *** These auxiliary programs are missing or
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[81fd230] | 124 | *** incompatible versions: msgfmt
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| 125 | *** some features will be disabled.
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[1f7ca93] | 126 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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| 127 | </blockquote>
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[81fd230] | 128 |
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[1f7ca93] | 129 | <para>The missing or incompatible <command>msgfmt</command> program is
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[5f7456b] | 130 | generally harmless. This <command>msgfmt</command> program is part of the
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| 131 | Gettext package which the host distribution should provide.</para>
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[81fd230] | 132 |
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[7b1923d] | 133 | <note><para>There have been reports that this package may fail when
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| 134 | building as a "parallel make". If this occurs, rerun the make command
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| 135 | with a "-j1" option.</para></note>
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| 136 |
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[1f7ca93] | 137 | <para>Compile the package:</para>
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[73aedd1d] | 138 |
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[0445a3d] | 139 | <screen><userinput remap="make">make</userinput></screen>
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[73aedd1d] | 140 |
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[1f7ca93] | 141 | <para>Install the package:</para>
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[73aedd1d] | 142 |
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[6a156bab] | 143 | <warning><para>If <envar>LFS</envar> is not properly set, and despite the
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[192c668] | 144 | recommendations, you are building as root, the next command will install
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| 145 | the newly built glibc to your host system, which most likely will render it
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| 146 | unusable. So double check that the environment is correctly set for user
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| 147 | <systemitem class="username">lfs</systemitem>.</para></warning>
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| 148 |
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[efcb393] | 149 | <screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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| 150 |
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| 151 | <variablelist>
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| 152 | <title>The meaning of the <command>make install</command> option:</title>
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| 153 |
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| 154 | <varlistentry>
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| 155 | <term><parameter>DESTDIR=$LFS</parameter></term>
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| 156 | <listitem>
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| 157 | <para>The <envar>DESTDIR</envar> make variable is used by almost all
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| 158 | packages to define the location where the package should be
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| 159 | installed. If it is not set, it defaults to the root (<filename
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| 160 | class="directory">/</filename>) directory. Here we specify that
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| 161 | the package be installed in <filename class="directory">$LFS
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| 162 | </filename>, which will become the root after <xref linkend=
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| 163 | "ch-tools-chroot"/>.</para>
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| 164 | </listitem>
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| 165 | </varlistentry>
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| 166 |
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| 167 | </variablelist>
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[73aedd1d] | 168 |
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[efcb393] | 169 | <caution>
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| 170 | <para>At this point, it is imperative to stop and ensure that the basic
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| 171 | functions (compiling and linking) of the new toolchain are working as
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| 172 | expected. To perform a sanity check, run the following commands:</para>
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[1a3e6a3] | 173 |
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[3d56263] | 174 | <screen><userinput>echo 'int main(){}' > dummy.c
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[1a3e6a3] | 175 | $LFS_TGT-gcc dummy.c
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[efcb393] | 176 | readelf -l a.out | grep '/ld-linux'</userinput></screen>
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[1a3e6a3] | 177 |
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[efcb393] | 178 | <para>If everything is working correctly, there should be no errors,
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| 179 | and the output of the last command will be of the form:</para>
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[1a3e6a3] | 180 |
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[efcb393] | 181 | <screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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[1a3e6a3] | 182 |
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[efcb393] | 183 | <para>Note that for 32-bit machines, the interpreter name will be
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| 184 | <filename>/lib/ld-linux.so.2</filename>.</para>
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[1a3e6a3] | 185 |
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[efcb393] | 186 | <para>If the output is not shown as above or there was no output at all,
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| 187 | then something is wrong. Investigate and retrace the steps to find out
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| 188 | where the problem is and correct it. This issue must be resolved before
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| 189 | continuing on.</para>
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[1a3e6a3] | 190 |
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[efcb393] | 191 | <para>Once all is well, clean up the test files:</para>
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[1a3e6a3] | 192 |
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| 193 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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| 194 |
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[efcb393] | 195 | </caution>
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| 196 |
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[79524a0] | 197 | <note><para>Building packages in the next chapter will serve as an
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[efcb393] | 198 | additional check that the toolchain has been built properly. If some
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| 199 | package, especially binutils-pass2 or gcc-pass2, fails to build, it is
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| 200 | an indication that something has gone wrong with the
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| 201 | previous Binutils, GCC, or Glibc installations.</para></note>
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| 202 |
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| 203 | <para>Now that our cross-toolchain is complete, finalize the installation
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[79524a0] | 204 | of the limits.h header. For doing so, run a utility provided by the GCC
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[efcb393] | 205 | developers:</para>
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[1a3e6a3] | 206 |
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[efcb393] | 207 | <screen><userinput>$LFS/tools/libexec/gcc/$LFS_TGT/&gcc-version;/install-tools/mkheaders</userinput></screen>
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[1a3e6a3] | 208 |
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[1f7ca93] | 209 | </sect2>
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[bc82645e] | 210 |
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[1f7ca93] | 211 | <sect2 role="content">
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| 212 | <title/>
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[81fd230] | 213 |
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[1f7ca93] | 214 | <para>Details on this package are located in
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| 215 | <xref linkend="contents-glibc" role="."/></para>
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| 216 |
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| 217 | </sect2>
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[81fd230] | 218 |
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[1f7ca93] | 219 | </sect1>
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