[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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[db51ee9] | 48 | operation of the dynamic library loader. It's needed to adjust the
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| 49 | command if you are building LFS for a target other than 32-bit or
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| 50 | 64-bit x86.</para>
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[efcb393] | 51 |
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[db51ee9] | 52 | <screen><userinput remap="pre">case $LFS_TGT in
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| 53 | i?86*) ln -sfv ld-linux.so.2 $LFS/lib/ld-lsb.so.3
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[d125a6b] | 54 | ;;
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[db51ee9] | 55 | x86_64*) ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64
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| 56 | ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3
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[d125a6b] | 57 | ;;
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| 58 | esac</userinput></screen>
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[efcb393] | 59 |
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[0fc1b27] | 60 | <note>
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| 61 | <para>
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| 62 | The above command is correct. The <command>ln</command> command has
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| 63 | a few syntactic versions, so be sure to check
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| 64 | <command>info coreutils ln</command> and <filename>ln(1)</filename>
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| 65 | before reporting what you may think is an error.
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| 66 | </para>
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| 67 | </note>
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| 68 |
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[efcb393] | 69 | <para>Some of the Glibc programs use the non-FHS compliant
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| 70 | <filename class="directory">/var/db</filename> directory to store their
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| 71 | runtime data. Apply the following patch to make such programs store their
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| 72 | runtime data in the FHS-compliant locations:</para>
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| 73 |
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| 74 | <screen><userinput remap="pre">patch -Np1 -i ../glibc-&glibc-version;-fhs-1.patch</userinput></screen>
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| 75 |
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[a26f29f] | 76 | <para>The Glibc documentation recommends building Glibc
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[f1dd547] | 77 | in a dedicated build directory:</para>
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[9bda40d] | 78 |
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[f1dd547] | 79 | <screen><userinput remap="pre">mkdir -v build
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| 80 | cd build</userinput></screen>
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[f1c177f] | 81 |
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[4eee9cc] | 82 | <para>Ensure that the <command>ldconfig</command> and <command>sln</command>
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[bcb20b4] | 83 | utilities are installed into
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[4eee9cc] | 84 | <filename class="directory">/usr/sbin</filename>:</para>
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| 85 |
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| 86 | <screen><userinput remap="pre">echo "rootsbindir=/usr/sbin" > configparms</userinput></screen>
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| 87 |
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[1f7ca93] | 88 | <para>Next, prepare Glibc for compilation:</para>
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[73aedd1d] | 89 |
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[63df8c7] | 90 | <screen><userinput remap="configure">../configure \
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[efcb393] | 91 | --prefix=/usr \
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[63df8c7] | 92 | --host=$LFS_TGT \
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| 93 | --build=$(../scripts/config.guess) \
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[cb518e0] | 94 | --enable-kernel=&linux-major-version;.&linux-minor-version; \
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[efcb393] | 95 | --with-headers=$LFS/usr/include \
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[7f25c84] | 96 | libc_cv_slibdir=/usr/lib</userinput></screen>
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[73aedd1d] | 97 |
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[1f7ca93] | 98 | <variablelist>
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| 99 | <title>The meaning of the configure options:</title>
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| 100 |
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[4e82d47] | 101 | <varlistentry>
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[418b038] | 102 | <term><parameter>--host=$LFS_TGT, --build=$(../scripts/config.guess)</parameter></term>
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[4e82d47] | 103 | <listitem>
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| 104 | <para>The combined effect of these switches is that Glibc's build system
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[efcb393] | 105 | configures itself to be cross-compiled, using the cross-linker and
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[d9cdc3e] | 106 | cross-compiler in <filename class="directory">$LFS/tools</filename>.</para>
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[4e82d47] | 107 | </listitem>
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| 108 | </varlistentry>
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[1118b17] | 109 |
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[1f7ca93] | 110 | <varlistentry>
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[cb518e0] | 111 | <term><parameter>--enable-kernel=&linux-major-version;.&linux-minor-version;</parameter></term>
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[1f7ca93] | 112 | <listitem>
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[cb518e0] | 113 | <para>This option tells the build system that this glibc may
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| 114 | be used with kernels as old as
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| 115 | &linux-major-version;.&linux-minor-version;. This means generating
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| 116 | workarounds in case a system call introduced in a later version
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| 117 | cannot be used.</para>
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[1f7ca93] | 118 | </listitem>
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| 119 | </varlistentry>
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[1118b17] | 120 |
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[1f7ca93] | 121 | <varlistentry>
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[efcb393] | 122 | <term><parameter>--with-headers=$LFS/usr/include</parameter></term>
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[1f7ca93] | 123 | <listitem>
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[77d2cd8d] | 124 | <para>This tells Glibc to compile itself against the headers
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| 125 | recently installed to the $LFS/usr/include directory, so that
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| 126 | it knows exactly what features the kernel has and can optimize
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| 127 | itself accordingly.</para>
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[1f7ca93] | 128 | </listitem>
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| 129 | </varlistentry>
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[efcb393] | 130 |
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[1f7ca93] | 131 | <varlistentry>
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[d7a9421] | 132 | <term><parameter>libc_cv_slibdir=/usr/lib</parameter></term>
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[1f7ca93] | 133 | <listitem>
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[d7a9421] | 134 | <para>This ensures that the library is installed in /usr/lib instead
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[efcb393] | 135 | of the default /lib64 on 64 bit machines.</para>
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[4e82d47] | 136 | </listitem>
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| 137 | </varlistentry>
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[1f7ca93] | 138 |
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| 139 | </variablelist>
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| 140 |
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| 141 | <para>During this stage the following warning might appear:</para>
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| 142 |
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| 143 | <blockquote>
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| 144 | <screen><computeroutput>configure: WARNING:
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| 145 | *** These auxiliary programs are missing or
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[81fd230] | 146 | *** incompatible versions: msgfmt
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| 147 | *** some features will be disabled.
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[1f7ca93] | 148 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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| 149 | </blockquote>
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[81fd230] | 150 |
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[1f7ca93] | 151 | <para>The missing or incompatible <command>msgfmt</command> program is
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[5f7456b] | 152 | generally harmless. This <command>msgfmt</command> program is part of the
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| 153 | Gettext package which the host distribution should provide.</para>
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[81fd230] | 154 |
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[a26f29f] | 155 | <note><para>There have been reports that this package may fail when
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[7b1923d] | 156 | building as a "parallel make". If this occurs, rerun the make command
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| 157 | with a "-j1" option.</para></note>
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| 158 |
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[1f7ca93] | 159 | <para>Compile the package:</para>
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[73aedd1d] | 160 |
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[0445a3d] | 161 | <screen><userinput remap="make">make</userinput></screen>
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[73aedd1d] | 162 |
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[1f7ca93] | 163 | <para>Install the package:</para>
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[73aedd1d] | 164 |
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[6a156bab] | 165 | <warning><para>If <envar>LFS</envar> is not properly set, and despite the
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[34fe7e0] | 166 | recommendations, you are building as
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| 167 | <systemitem class="username">root</systemitem>, the next command will
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| 168 | install the newly built glibc to your host system, which most likely
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| 169 | will render it unusable. So double check that the environment is
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| 170 | correctly set, before running the following command.</para></warning>
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[192c668] | 171 |
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[efcb393] | 172 | <screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
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| 173 |
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| 174 | <variablelist>
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| 175 | <title>The meaning of the <command>make install</command> option:</title>
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| 176 |
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| 177 | <varlistentry>
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| 178 | <term><parameter>DESTDIR=$LFS</parameter></term>
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| 179 | <listitem>
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| 180 | <para>The <envar>DESTDIR</envar> make variable is used by almost all
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| 181 | packages to define the location where the package should be
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| 182 | installed. If it is not set, it defaults to the root (<filename
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| 183 | class="directory">/</filename>) directory. Here we specify that
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| 184 | the package be installed in <filename class="directory">$LFS
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| 185 | </filename>, which will become the root after <xref linkend=
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| 186 | "ch-tools-chroot"/>.</para>
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| 187 | </listitem>
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| 188 | </varlistentry>
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| 189 |
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| 190 | </variablelist>
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[1b1acbed] | 191 |
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[7bf2e85] | 192 | <para>Fix hardcoded path to the executable loader in
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| 193 | <command>ldd</command> script:</para>
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| 194 |
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| 195 | <screen><userinput remap="install">sed '/RTLDLIST=/s@/usr@@g' -i $LFS/usr/bin/ldd</userinput></screen>
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[1b1acbed] | 196 |
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[efcb393] | 197 | <caution>
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| 198 | <para>At this point, it is imperative to stop and ensure that the basic
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| 199 | functions (compiling and linking) of the new toolchain are working as
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| 200 | expected. To perform a sanity check, run the following commands:</para>
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[1a3e6a3] | 201 |
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[3d56263] | 202 | <screen><userinput>echo 'int main(){}' > dummy.c
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[1a3e6a3] | 203 | $LFS_TGT-gcc dummy.c
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[efcb393] | 204 | readelf -l a.out | grep '/ld-linux'</userinput></screen>
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[1a3e6a3] | 205 |
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[efcb393] | 206 | <para>If everything is working correctly, there should be no errors,
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| 207 | and the output of the last command will be of the form:</para>
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[1a3e6a3] | 208 |
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[efcb393] | 209 | <screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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[1a3e6a3] | 210 |
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[efcb393] | 211 | <para>Note that for 32-bit machines, the interpreter name will be
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| 212 | <filename>/lib/ld-linux.so.2</filename>.</para>
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[1a3e6a3] | 213 |
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[efcb393] | 214 | <para>If the output is not shown as above or there was no output at all,
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| 215 | then something is wrong. Investigate and retrace the steps to find out
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| 216 | where the problem is and correct it. This issue must be resolved before
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| 217 | continuing on.</para>
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[1a3e6a3] | 218 |
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[efcb393] | 219 | <para>Once all is well, clean up the test files:</para>
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[1a3e6a3] | 220 |
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| 221 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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| 222 |
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[efcb393] | 223 | </caution>
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| 224 |
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[79524a0] | 225 | <note><para>Building packages in the next chapter will serve as an
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[efcb393] | 226 | additional check that the toolchain has been built properly. If some
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| 227 | package, especially binutils-pass2 or gcc-pass2, fails to build, it is
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| 228 | an indication that something has gone wrong with the
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| 229 | previous Binutils, GCC, or Glibc installations.</para></note>
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| 230 |
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| 231 | <para>Now that our cross-toolchain is complete, finalize the installation
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[79524a0] | 232 | of the limits.h header. For doing so, run a utility provided by the GCC
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[efcb393] | 233 | developers:</para>
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[1a3e6a3] | 234 |
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[efcb393] | 235 | <screen><userinput>$LFS/tools/libexec/gcc/$LFS_TGT/&gcc-version;/install-tools/mkheaders</userinput></screen>
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[1a3e6a3] | 236 |
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[1f7ca93] | 237 | </sect2>
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[bc82645e] | 238 |
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[1f7ca93] | 239 | <sect2 role="content">
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| 240 | <title/>
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[81fd230] | 241 |
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[1f7ca93] | 242 | <para>Details on this package are located in
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| 243 | <xref linkend="contents-glibc" role="."/></para>
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| 244 |
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| 245 | </sect2>
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[81fd230] | 246 |
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[1f7ca93] | 247 | </sect1>
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