[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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[1f7ca93] | 28 | href="../chapter06/glibc.xml"
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| 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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[e4a5635] | 36 | <seg>&glibc-ch5-sbu;</seg>
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| 37 | <seg>&glibc-ch5-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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[73aedd1d] | 45 |
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[0c0d7c1] | 46 | <para>Address a header check that fails due to an incomplete build
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| 47 | environment at this point:</para>
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[4916842] | 48 |
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[0c0d7c1] | 49 | <screen><userinput remap="pre">sed -i 's#$ac_includes_default#\n\n#' sysdeps/i386/configure</userinput></screen>
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[3e80156] | 50 |
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[0c0d7c1] | 51 | <para>Fix a path that is hardcoded:</para>
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[35aef6b] | 52 |
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[0c0d7c1] | 53 | <screen><userinput remap="pre">sed -i 's#/var/db#/tools/var/db#' Makeconfig</userinput></screen>
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[35aef6b] | 54 |
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[8364323] | 55 | <para>Fix a bug that prevents Glibc from building with GCC-&gcc-version;:</para>
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| 56 | <screen><userinput remap="pre">patch -Np1 -i ../&glibc-gcc_fix-patch;</userinput></screen>
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| 57 |
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[9bda40d] | 58 | <para>The Glibc documentation recommends building Glibc outside of the source
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| 59 | directory in a dedicated build directory:</para>
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| 60 |
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[0445a3d] | 61 | <screen><userinput remap="pre">mkdir -v ../glibc-build
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[73aedd1d] | 62 | cd ../glibc-build</userinput></screen>
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| 63 |
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[2a7ac34] | 64 | <para>Because Glibc no longer supports i386, its developers say to use the
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| 65 | compiler flag <parameter>-march=i486</parameter> when building it for x86
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| 66 | machines. There are several ways to accomplish that, but testing shows that
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| 67 | the flag is best placed inside the build variable <quote>CFLAGS</quote>.
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| 68 | Instead of overriding completely what Glibc's internal build system uses
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| 69 | for CFLAGS, append the new flag to the existing contents of CFLAGS by
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[1c6f1c1] | 70 | making use of the special file <filename>configparms</filename>. The
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| 71 | -mtune=native flag is also necessary to reset a reasonable value for -mtune
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| 72 | that is changed when setting -march.</para>
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[2a7ac34] | 73 |
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[6e88633] | 74 | <screen><userinput remap="configure">case `uname -m` in
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| 75 | i?86) echo "CFLAGS += -march=i486 -mtune=native" > configparms ;;
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| 76 | esac</userinput></screen>
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[2a7ac34] | 77 |
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[1f7ca93] | 78 | <para>Next, prepare Glibc for compilation:</para>
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[73aedd1d] | 79 |
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[9f5aaf7] | 80 | <screen><userinput remap="configure">../glibc-&glibc-version;/configure \
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| 81 | --prefix=/tools \
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| 82 | --host=$LFS_TGT \
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| 83 | --build=$(../glibc-&glibc-version;/scripts/config.guess) \
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| 84 | --disable-profile \
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| 85 | --enable-add-ons \
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| 86 | --enable-kernel=2.6.25 \
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| 87 | --with-headers=/tools/include \
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| 88 | libc_cv_forced_unwind=yes \
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[0c0d7c1] | 89 | libc_cv_ctors_header=yes \
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[9f5aaf7] | 90 | libc_cv_c_cleanup=yes</userinput></screen>
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[73aedd1d] | 91 |
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[1f7ca93] | 92 | <variablelist>
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| 93 | <title>The meaning of the configure options:</title>
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| 94 |
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[4e82d47] | 95 | <varlistentry>
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| 96 | <term><parameter>--host=$LFS_TGT, --build=$(../glibc-&glibc-version;/scripts/config.guess)</parameter></term>
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| 97 | <listitem>
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| 98 | <para>The combined effect of these switches is that Glibc's build system
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| 99 | configures itself to cross-compile, using the cross-linker and
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| 100 | cross-compiler in <filename class="directory">/tools</filename>.</para>
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| 101 | </listitem>
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| 102 | </varlistentry>
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| 103 |
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[1f7ca93] | 104 | <varlistentry>
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| 105 | <term><parameter>--disable-profile</parameter></term>
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| 106 | <listitem>
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| 107 | <para>This builds the libraries without profiling information. Omit
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| 108 | this option if profiling on the temporary tools is necessary.</para>
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| 109 | </listitem>
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| 110 | </varlistentry>
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| 111 |
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| 112 | <varlistentry>
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| 113 | <term><parameter>--enable-add-ons</parameter></term>
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| 114 | <listitem>
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| 115 | <para>This tells Glibc to use the NPTL add-on as its threading
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| 116 | library.</para>
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| 117 | </listitem>
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| 118 | </varlistentry>
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| 119 |
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| 120 | <varlistentry>
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[13e7d79] | 121 | <term><parameter>--enable-kernel=2.6.25</parameter></term>
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[1f7ca93] | 122 | <listitem>
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| 123 | <para>This tells Glibc to compile the library with support
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[13e7d79] | 124 | for 2.6.25 and later Linux kernels. Workarounds for older
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[3532721] | 125 | kernels are not enabled.</para>
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[1f7ca93] | 126 | </listitem>
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| 127 | </varlistentry>
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| 128 |
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| 129 | <varlistentry>
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| 130 | <term><parameter>--with-headers=/tools/include</parameter></term>
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| 131 | <listitem>
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| 132 | <para>This tells Glibc to compile itself against the headers recently
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| 133 | installed to the tools directory, so that it knows exactly what
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| 134 | features the kernel has and can optimize itself accordingly.</para>
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| 135 | </listitem>
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| 136 | </varlistentry>
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| 137 |
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| 138 | <varlistentry>
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[4e82d47] | 139 | <term><parameter>libc_cv_forced_unwind=yes</parameter></term>
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[1f7ca93] | 140 | <listitem>
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[ff9fa3c0] | 141 | <para>The linker installed during
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| 142 | <xref linkend="ch-tools-binutils-pass1"/> was cross-compiled and as
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| 143 | such cannot be used until Glibc has been installed. This means that
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| 144 | the configure test for force-unwind support will fail, as it relies on
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| 145 | a working linker. The libc_cv_forced_unwind=yes variable is passed in
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| 146 | order to inform <command>configure</command> that force-unwind
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| 147 | support is available without it having to run the test.</para>
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[4e82d47] | 148 | </listitem>
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| 149 | </varlistentry>
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| 150 | <varlistentry>
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| 151 | <term><parameter>libc_cv_c_cleanup=yes</parameter></term>
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| 152 | <listitem>
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[ff9fa3c0] | 153 | <para>Simlarly, we pass libc_cv_c_cleanup=yes through to the
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| 154 | <command>configure</command> script so that the test is skipped and C
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| 155 | cleanup handling support is configured.</para>
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[1f7ca93] | 156 | </listitem>
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| 157 | </varlistentry>
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[0c0d7c1] | 158 | <varlistentry>
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| 159 | <term><parameter>libc_cv_ctors_header=yes</parameter></term>
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| 160 | <listitem>
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| 161 | <para>Simlarly, we pass libc_cv_ctors_header=yes through to the
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| 162 | <command>configure</command> script so that the test is skipped and
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| 163 | gcc constructor support is configured.</para>
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| 164 | </listitem>
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| 165 | </varlistentry>
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[1f7ca93] | 166 |
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| 167 | </variablelist>
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| 168 |
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| 169 | <para>During this stage the following warning might appear:</para>
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| 170 |
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| 171 | <blockquote>
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| 172 | <screen><computeroutput>configure: WARNING:
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| 173 | *** These auxiliary programs are missing or
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[81fd230] | 174 | *** incompatible versions: msgfmt
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| 175 | *** some features will be disabled.
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[1f7ca93] | 176 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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| 177 | </blockquote>
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[81fd230] | 178 |
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[1f7ca93] | 179 | <para>The missing or incompatible <command>msgfmt</command> program is
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[5f7456b] | 180 | generally harmless. This <command>msgfmt</command> program is part of the
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| 181 | Gettext package which the host distribution should provide.</para>
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[81fd230] | 182 |
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[1f7ca93] | 183 | <para>Compile the package:</para>
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[73aedd1d] | 184 |
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[0445a3d] | 185 | <screen><userinput remap="make">make</userinput></screen>
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[73aedd1d] | 186 |
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[0abc697] | 187 | <para>This package does come with a test suite, however, it cannot be
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| 188 | run at this time because we do not have a C++ compiler yet.</para>
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[81fd230] | 189 |
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[ca2f862e] | 190 | <note>
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| 191 | <para>The test suite also requires locale data to be installed in order to run
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[90674770] | 192 | successfully. Locale data provides information to the system regarding
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[ca2f862e] | 193 | such things as the date, time, and currency formats accepted and output by
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| 194 | system utilities. If the test suites are not being run in this chapter
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| 195 | (as per the recommendation), there is no need to install the locales now.
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| 196 | The appropriate locales will be installed in the next chapter. To install
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| 197 | the Glibc locales anyway, use instructions from <xref
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| 198 | linkend="ch-system-glibc" role="."/></para>
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| 199 | </note>
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| 200 |
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[1f7ca93] | 201 | <para>Install the package:</para>
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[73aedd1d] | 202 |
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[0445a3d] | 203 | <screen><userinput remap="install">make install</userinput></screen>
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[73aedd1d] | 204 |
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[1a3e6a3] | 205 | <caution>
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| 206 | <para>At this point, it is imperative to stop and ensure that the basic
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| 207 | functions (compiling and linking) of the new toolchain are working as
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| 208 | expected. To perform a sanity check, run the following commands:</para>
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| 209 |
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| 210 | <screen><userinput>echo 'main(){}' > dummy.c
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| 211 | $LFS_TGT-gcc dummy.c
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| 212 | readelf -l a.out | grep ': /tools'</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: /tools/lib/ld-linux.so.2]</computeroutput></screen>
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| 218 |
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| 219 | <para>Note that <filename class="directory">/tools/lib</filename>, or
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| 220 | <filename class="directory">/tools/lib64</filename> for 64-bit machines
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| 221 | appears as the prefix of the dynamic linker.</para>
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| 222 |
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| 223 | <para>If the output is not shown as above or there was no output at all,
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| 224 | then something is wrong. Investigate and retrace the steps to find out
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| 225 | where the problem is and correct it. This issue must be resolved before
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[1c47f33] | 226 | continuing on.</para>
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[1a3e6a3] | 227 |
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| 228 | <para>Once all is well, clean up the test files:</para>
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| 229 |
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| 230 | <screen><userinput>rm -v dummy.c a.out</userinput></screen>
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| 231 |
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| 232 | </caution>
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| 233 |
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| 234 | <note><para>Building Binutils in the next section will serve as an additional check that
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| 235 | the toolchain has been built properly. If Binutils fails to build, it is an
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| 236 | indication that something has gone wrong with the previous Binutils, GCC, or Glibc
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| 237 | installations.</para></note>
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| 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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