[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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[d125a6b] | 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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[efcb393] | 48 | operation of the dynamic library loader:</para>
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| 49 |
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[d125a6b] | 50 | <screen><userinput remap="pre">case $(uname -m) 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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[efcb393] | 57 |
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| 58 | <para>Some of the Glibc programs use the non-FHS compliant
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| 59 | <filename class="directory">/var/db</filename> directory to store their
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| 60 | runtime data. Apply the following patch to make such programs store their
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| 61 | runtime data in the FHS-compliant locations:</para>
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| 62 |
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| 63 | <screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
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| 64 |
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[d7a9421] | 65 | <para>Fix a build issue with gcc-11.1:</para>
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| 66 |
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| 67 | <screen><userinput remap="pre">sed 's/amx_/amx-/' -i sysdeps/x86/tst-cpu-features-supports.c</userinput></screen>
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| 68 |
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[f1dd547] | 69 | <para>The Glibc documentation recommends building Glibc
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| 70 | in a dedicated build directory:</para>
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[9bda40d] | 71 |
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[f1dd547] | 72 | <screen><userinput remap="pre">mkdir -v build
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| 73 | cd build</userinput></screen>
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[f1c177f] | 74 |
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[4eee9cc] | 75 | <para>Ensure that the <command>ldconfig</command> and <command>sln</command>
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| 76 | utilites are installed into
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| 77 | <filename class="directory">/usr/sbin</filename>:</para>
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| 78 |
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| 79 | <screen><userinput remap="pre">echo "rootsbindir=/usr/sbin" > configparms</userinput></screen>
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| 80 |
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[1f7ca93] | 81 | <para>Next, prepare Glibc for compilation:</para>
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[73aedd1d] | 82 |
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[63df8c7] | 83 | <screen><userinput remap="configure">../configure \
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[efcb393] | 84 | --prefix=/usr \
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[63df8c7] | 85 | --host=$LFS_TGT \
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| 86 | --build=$(../scripts/config.guess) \
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[c10c983] | 87 | --enable-kernel=&min-kernel; \
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[efcb393] | 88 | --with-headers=$LFS/usr/include \
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[7f25c84] | 89 | libc_cv_slibdir=/usr/lib</userinput></screen>
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[73aedd1d] | 90 |
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[1f7ca93] | 91 | <variablelist>
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| 92 | <title>The meaning of the configure options:</title>
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| 93 |
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[4e82d47] | 94 | <varlistentry>
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[418b038] | 95 | <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
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[4e82d47] | 96 | <listitem>
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| 97 | <para>The combined effect of these switches is that Glibc's build system
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[efcb393] | 98 | configures itself to be cross-compiled, using the cross-linker and
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[d9cdc3e] | 99 | cross-compiler in <filename class="directory">$LFS/tools</filename>.</para>
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[4e82d47] | 100 | </listitem>
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| 101 | </varlistentry>
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[1118b17] | 102 |
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[1f7ca93] | 103 | <varlistentry>
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[70cd9f32] | 104 | <term><parameter>--enable-kernel=&min-kernel;</parameter></term>
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[1f7ca93] | 105 | <listitem>
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| 106 | <para>This tells Glibc to compile the library with support
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[70cd9f32] | 107 | for &min-kernel; and later Linux kernels. Workarounds for older
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[3532721] | 108 | kernels are not enabled.</para>
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[1f7ca93] | 109 | </listitem>
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| 110 | </varlistentry>
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[1118b17] | 111 |
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[1f7ca93] | 112 | <varlistentry>
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[efcb393] | 113 | <term><parameter>--with-headers=$LFS/usr/include</parameter></term>
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[1f7ca93] | 114 | <listitem>
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[77d2cd8d] | 115 | <para>This tells Glibc to compile itself against the headers
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| 116 | recently installed to the $LFS/usr/include directory, so that
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| 117 | it knows exactly what features the kernel has and can optimize
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| 118 | itself accordingly.</para>
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[1f7ca93] | 119 | </listitem>
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| 120 | </varlistentry>
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[efcb393] | 121 |
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[1f7ca93] | 122 | <varlistentry>
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[d7a9421] | 123 | <term><parameter>libc_cv_slibdir=/usr/lib</parameter></term>
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[1f7ca93] | 124 | <listitem>
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[d7a9421] | 125 | <para>This ensures that the library is installed in /usr/lib instead
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[efcb393] | 126 | of the default /lib64 on 64 bit machines.</para>
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[4e82d47] | 127 | </listitem>
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| 128 | </varlistentry>
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[1f7ca93] | 129 |
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[0ceb295] | 130 | <varlistentry>
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| 131 | <term><option>libc_cv_include_x86_isa_level=no</option></term>
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| 132 | <listitem>
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| 133 | <para>This disables <quote>x86 ISA needed</quote> property in
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| 134 | Glibc libraries. Use it <emphasis role="bold">if</emphasis>
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| 135 | you are building Glibc with <option>-march</option> option in
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| 136 | <envar>CFLAGS</envar>, to workaround an issue in Glibc-2.33
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| 137 | breaking it.</para>
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| 138 | </listitem>
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| 139 | </varlistentry>
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| 140 |
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[1f7ca93] | 141 | </variablelist>
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| 142 |
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| 143 | <para>During this stage the following warning might appear:</para>
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| 144 |
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| 145 | <blockquote>
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| 146 | <screen><computeroutput>configure: WARNING:
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| 147 | *** These auxiliary programs are missing or
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[81fd230] | 148 | *** incompatible versions: msgfmt
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| 149 | *** some features will be disabled.
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[1f7ca93] | 150 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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| 151 | </blockquote>
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[81fd230] | 152 |
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[1f7ca93] | 153 | <para>The missing or incompatible <command>msgfmt</command> program is
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[5f7456b] | 154 | generally harmless. This <command>msgfmt</command> program is part of the
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| 155 | Gettext package which the host distribution should provide.</para>
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[81fd230] | 156 |
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[7b1923d] | 157 | <note><para>There have been reports that this package may fail when
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| 158 | building as a "parallel make". If this occurs, rerun the make command
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| 159 | with a "-j1" option.</para></note>
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| 160 |
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[1f7ca93] | 161 | <para>Compile the package:</para>
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[73aedd1d] | 162 |
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[0445a3d] | 163 | <screen><userinput remap="make">make</userinput></screen>
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[73aedd1d] | 164 |
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[1f7ca93] | 165 | <para>Install the package:</para>
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[73aedd1d] | 166 |
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[6a156bab] | 167 | <warning><para>If <envar>LFS</envar> is not properly set, and despite the
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[34fe7e0] | 168 | recommendations, you are building as
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| 169 | <systemitem class="username">root</systemitem>, the next command will
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| 170 | install the newly built glibc to your host system, which most likely
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| 171 | will render it unusable. So double check that the environment is
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| 172 | correctly set, before running the following command.</para></warning>
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[192c668] | 173 |
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[efcb393] | 174 | <screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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| 175 |
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| 176 | <variablelist>
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| 177 | <title>The meaning of the <command>make install</command> option:</title>
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| 178 |
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| 179 | <varlistentry>
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| 180 | <term><parameter>DESTDIR=$LFS</parameter></term>
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| 181 | <listitem>
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| 182 | <para>The <envar>DESTDIR</envar> make variable is used by almost all
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| 183 | packages to define the location where the package should be
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| 184 | installed. If it is not set, it defaults to the root (<filename
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| 185 | class="directory">/</filename>) directory. Here we specify that
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| 186 | the package be installed in <filename class="directory">$LFS
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| 187 | </filename>, which will become the root after <xref linkend=
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| 188 | "ch-tools-chroot"/>.</para>
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| 189 | </listitem>
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| 190 | </varlistentry>
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| 191 |
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| 192 | </variablelist>
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[1b1acbed] | 193 |
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[7bf2e85] | 194 | <para>Fix hardcoded path to the executable loader in
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| 195 | <command>ldd</command> script:</para>
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| 196 |
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| 197 | <screen><userinput remap="install">sed '/RTLDLIST=/s@/usr@@g' -i $LFS/usr/bin/ldd</userinput></screen>
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[1b1acbed] | 198 |
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[efcb393] | 199 | <caution>
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| 200 | <para>At this point, it is imperative to stop and ensure that the basic
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| 201 | functions (compiling and linking) of the new toolchain are working as
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| 202 | expected. To perform a sanity check, run the following commands:</para>
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[1a3e6a3] | 203 |
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[3d56263] | 204 | <screen><userinput>echo 'int main(){}' > dummy.c
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[1a3e6a3] | 205 | $LFS_TGT-gcc dummy.c
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[efcb393] | 206 | readelf -l a.out | grep '/ld-linux'</userinput></screen>
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[1a3e6a3] | 207 |
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[efcb393] | 208 | <para>If everything is working correctly, there should be no errors,
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| 209 | and the output of the last command will be of the form:</para>
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[1a3e6a3] | 210 |
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[efcb393] | 211 | <screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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[1a3e6a3] | 212 |
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[efcb393] | 213 | <para>Note that for 32-bit machines, the interpreter name will be
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| 214 | <filename>/lib/ld-linux.so.2</filename>.</para>
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[1a3e6a3] | 215 |
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[efcb393] | 216 | <para>If the output is not shown as above or there was no output at all,
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| 217 | then something is wrong. Investigate and retrace the steps to find out
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| 218 | where the problem is and correct it. This issue must be resolved before
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| 219 | continuing on.</para>
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[1a3e6a3] | 220 |
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[efcb393] | 221 | <para>Once all is well, clean up the test files:</para>
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[1a3e6a3] | 222 |
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| 223 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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| 224 |
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[efcb393] | 225 | </caution>
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| 226 |
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[79524a0] | 227 | <note><para>Building packages in the next chapter will serve as an
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[efcb393] | 228 | additional check that the toolchain has been built properly. If some
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| 229 | package, especially binutils-pass2 or gcc-pass2, fails to build, it is
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| 230 | an indication that something has gone wrong with the
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| 231 | previous Binutils, GCC, or Glibc installations.</para></note>
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| 232 |
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| 233 | <para>Now that our cross-toolchain is complete, finalize the installation
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[79524a0] | 234 | of the limits.h header. For doing so, run a utility provided by the GCC
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[efcb393] | 235 | developers:</para>
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[1a3e6a3] | 236 |
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[efcb393] | 237 | <screen><userinput>$LFS/tools/libexec/gcc/$LFS_TGT/&gcc-version;/install-tools/mkheaders</userinput></screen>
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[1a3e6a3] | 238 |
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[1f7ca93] | 239 | </sect2>
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[bc82645e] | 240 |
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[1f7ca93] | 241 | <sect2 role="content">
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| 242 | <title/>
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[81fd230] | 243 |
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[1f7ca93] | 244 | <para>Details on this package are located in
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| 245 | <xref linkend="contents-glibc" role="."/></para>
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| 246 |
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| 247 | </sect2>
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[81fd230] | 248 |
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[1f7ca93] | 249 | </sect1>
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