[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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[1f7ca93] | 27 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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| 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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[2594b0a] | 46 | <!-- This sed can be removed for any glibc newer than 2.10.1 (along with the
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| 47 | matching sed in chapter 6). See glibc bug 10262. -->
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| 48 | <para>Fix an error in the constants that get passed to the futex system
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| 49 | call in some cases, causing certain pthread_mutex operations to fail:</para>
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| 50 |
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[d9ed5f37] | 51 | <screen><userinput remap="pre">cp -v nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S{,.orig}
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[2594b0a] | 52 | sed -e 's/FUTEX_WAIT\( | FUTEX_CLOCK_REALTIME, reg\)/FUTEX_WAIT_BITSET\1/' \
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| 53 | <nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S.orig \
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| 54 | >nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S</userinput></screen>
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| 55 |
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[1f7ca93] | 56 | <para>The Glibc documentation recommends building Glibc outside of the source
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| 57 | directory in a dedicated build directory:</para>
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[3d36131c] | 58 |
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[0445a3d] | 59 | <screen><userinput remap="pre">mkdir -v ../glibc-build
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[73aedd1d] | 60 | cd ../glibc-build</userinput></screen>
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| 61 |
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[2a7ac34] | 62 | <para>Because Glibc no longer supports i386, its developers say to use the
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| 63 | compiler flag <parameter>-march=i486</parameter> when building it for x86
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| 64 | machines. There are several ways to accomplish that, but testing shows that
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| 65 | the flag is best placed inside the build variable <quote>CFLAGS</quote>.
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| 66 | Instead of overriding completely what Glibc's internal build system uses
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| 67 | for CFLAGS, append the new flag to the existing contents of CFLAGS by
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[1c6f1c1] | 68 | making use of the special file <filename>configparms</filename>. The
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| 69 | -mtune=native flag is also necessary to reset a reasonable value for -mtune
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| 70 | that is changed when setting -march.</para>
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[2a7ac34] | 71 |
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[6e88633] | 72 | <screen><userinput remap="configure">case `uname -m` in
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| 73 | i?86) echo "CFLAGS += -march=i486 -mtune=native" > configparms ;;
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| 74 | esac</userinput></screen>
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[2a7ac34] | 75 |
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[1f7ca93] | 76 | <para>Next, prepare Glibc for compilation:</para>
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[73aedd1d] | 77 |
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[0445a3d] | 78 | <screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/tools \
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[4e82d47] | 79 | --host=$LFS_TGT --build=$(../glibc-&glibc-version;/scripts/config.guess) \
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[94aa6621] | 80 | --disable-profile --enable-add-ons \
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[3532721] | 81 | --enable-kernel=2.6.18 --with-headers=/tools/include \
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[4e82d47] | 82 | libc_cv_forced_unwind=yes libc_cv_c_cleanup=yes</userinput></screen>
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[73aedd1d] | 83 |
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[1f7ca93] | 84 | <variablelist>
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| 85 | <title>The meaning of the configure options:</title>
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| 86 |
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[4e82d47] | 87 | <varlistentry>
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| 88 | <term><parameter>--host=$LFS_TGT, --build=$(../glibc-&glibc-version;/scripts/config.guess)</parameter></term>
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| 89 | <listitem>
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| 90 | <para>The combined effect of these switches is that Glibc's build system
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| 91 | configures itself to cross-compile, using the cross-linker and
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| 92 | cross-compiler in <filename class="directory">/tools</filename>.</para>
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| 93 | </listitem>
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| 94 | </varlistentry>
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| 95 |
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[1f7ca93] | 96 | <varlistentry>
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| 97 | <term><parameter>--disable-profile</parameter></term>
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| 98 | <listitem>
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| 99 | <para>This builds the libraries without profiling information. Omit
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| 100 | this option if profiling on the temporary tools is necessary.</para>
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| 101 | </listitem>
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| 102 | </varlistentry>
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| 103 |
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| 104 | <varlistentry>
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| 105 | <term><parameter>--enable-add-ons</parameter></term>
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| 106 | <listitem>
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| 107 | <para>This tells Glibc to use the NPTL add-on as its threading
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| 108 | library.</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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[3532721] | 113 | <term><parameter>--enable-kernel=2.6.18</parameter></term>
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[1f7ca93] | 114 | <listitem>
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| 115 | <para>This tells Glibc to compile the library with support
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[3532721] | 116 | for 2.6.18 and later Linux kernels. Workarounds for older
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| 117 | kernels are not enabled.</para>
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[1f7ca93] | 118 | </listitem>
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| 119 | </varlistentry>
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| 120 |
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| 121 | <varlistentry>
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| 122 | <term><parameter>--with-headers=/tools/include</parameter></term>
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| 123 | <listitem>
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| 124 | <para>This tells Glibc to compile itself against the headers recently
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| 125 | installed to the tools directory, so that it knows exactly what
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| 126 | features the kernel has and can optimize itself accordingly.</para>
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| 127 | </listitem>
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| 128 | </varlistentry>
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| 129 |
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| 130 | <varlistentry>
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[4e82d47] | 131 | <term><parameter>libc_cv_forced_unwind=yes</parameter></term>
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[1f7ca93] | 132 | <listitem>
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[4e82d47] | 133 | <para>The build requires support for forced unwind, but because it is
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| 134 | being cross compiled, it cannot auto detect it. Setting this variable
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[1cdaff9] | 135 | on the command line explicitly tells the
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| 136 | <command>configure</command> script that support is available.</para>
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[4e82d47] | 137 | </listitem>
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| 138 | </varlistentry>
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| 139 | <varlistentry>
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| 140 | <term><parameter>libc_cv_c_cleanup=yes</parameter></term>
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| 141 | <listitem>
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| 142 | <para>The build also requires support for C cleanup handling, which it
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| 143 | cannot auto detect when being cross compiled. Enable it explicitly.</para>
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[1f7ca93] | 144 | </listitem>
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| 145 | </varlistentry>
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| 146 |
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| 147 | </variablelist>
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| 148 |
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| 149 | <para>During this stage the following warning might appear:</para>
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| 150 |
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| 151 | <blockquote>
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| 152 | <screen><computeroutput>configure: WARNING:
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| 153 | *** These auxiliary programs are missing or
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[81fd230] | 154 | *** incompatible versions: msgfmt
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| 155 | *** some features will be disabled.
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[1f7ca93] | 156 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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| 157 | </blockquote>
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[81fd230] | 158 |
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[1f7ca93] | 159 | <para>The missing or incompatible <command>msgfmt</command> program is
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| 160 | generally harmless, but it can sometimes cause issues when running the
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| 161 | test suite. This <command>msgfmt</command> program is part of the
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| 162 | Gettext package which the host distribution should provide. If
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| 163 | <command>msgfmt</command> is present but deemed incompatible, upgrade
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| 164 | the host system's Gettext package or continue without it and see if
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| 165 | the test suite runs without problems regardless.</para>
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[81fd230] | 166 |
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[1f7ca93] | 167 | <para>Compile the package:</para>
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[73aedd1d] | 168 |
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[0445a3d] | 169 | <screen><userinput remap="make">make</userinput></screen>
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[73aedd1d] | 170 |
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[0abc697] | 171 | <para>This package does come with a test suite, however, it cannot be
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| 172 | run at this time because we do not have a C++ compiler yet.</para>
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[81fd230] | 173 |
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[ca2f862e] | 174 | <note>
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| 175 | <para>The test suite also requires locale data to be installed in order to run
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[90674770] | 176 | successfully. Locale data provides information to the system regarding
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[ca2f862e] | 177 | such things as the date, time, and currency formats accepted and output by
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| 178 | system utilities. If the test suites are not being run in this chapter
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| 179 | (as per the recommendation), there is no need to install the locales now.
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| 180 | The appropriate locales will be installed in the next chapter. To install
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| 181 | the Glibc locales anyway, use instructions from <xref
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| 182 | linkend="ch-system-glibc" role="."/></para>
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| 183 | </note>
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| 184 |
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[1f7ca93] | 185 | <para>Install the package:</para>
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[73aedd1d] | 186 |
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[0445a3d] | 187 | <screen><userinput remap="install">make install</userinput></screen>
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[73aedd1d] | 188 |
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[1f7ca93] | 189 | </sect2>
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[bc82645e] | 190 |
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[1f7ca93] | 191 | <sect2 role="content">
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| 192 | <title/>
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[81fd230] | 193 |
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[1f7ca93] | 194 | <para>Details on this package are located in
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| 195 | <xref linkend="contents-glibc" role="."/></para>
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| 196 |
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| 197 | </sect2>
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[81fd230] | 198 |
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[1f7ca93] | 199 | </sect1>
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