[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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[1f7ca93] | 46 | <para>The Glibc documentation recommends building Glibc outside of the source
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| 47 | directory in a dedicated build directory:</para>
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[3d36131c] | 48 |
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[0445a3d] | 49 | <screen><userinput remap="pre">mkdir -v ../glibc-build
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[73aedd1d] | 50 | cd ../glibc-build</userinput></screen>
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| 51 |
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[2a7ac34] | 52 | <para>Because Glibc no longer supports i386, its developers say to use the
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| 53 | compiler flag <parameter>-march=i486</parameter> when building it for x86
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| 54 | machines. There are several ways to accomplish that, but testing shows that
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| 55 | the flag is best placed inside the build variable <quote>CFLAGS</quote>.
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| 56 | Instead of overriding completely what Glibc's internal build system uses
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| 57 | for CFLAGS, append the new flag to the existing contents of CFLAGS by
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[1c6f1c1] | 58 | making use of the special file <filename>configparms</filename>. The
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| 59 | -mtune=native flag is also necessary to reset a reasonable value for -mtune
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| 60 | that is changed when setting -march.</para>
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[2a7ac34] | 61 |
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[6e88633] | 62 | <screen><userinput remap="configure">case `uname -m` in
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| 63 | i?86) echo "CFLAGS += -march=i486 -mtune=native" > configparms ;;
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| 64 | esac</userinput></screen>
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[2a7ac34] | 65 |
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[1f7ca93] | 66 | <para>Next, prepare Glibc for compilation:</para>
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[73aedd1d] | 67 |
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[0445a3d] | 68 | <screen><userinput remap="configure">../glibc-&glibc-version;/configure --prefix=/tools \
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[4e82d47] | 69 | --host=$LFS_TGT --build=$(../glibc-&glibc-version;/scripts/config.guess) \
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[94aa6621] | 70 | --disable-profile --enable-add-ons \
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[3532721] | 71 | --enable-kernel=2.6.18 --with-headers=/tools/include \
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[4e82d47] | 72 | libc_cv_forced_unwind=yes libc_cv_c_cleanup=yes</userinput></screen>
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[73aedd1d] | 73 |
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[1f7ca93] | 74 | <variablelist>
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| 75 | <title>The meaning of the configure options:</title>
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| 76 |
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[4e82d47] | 77 | <varlistentry>
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| 78 | <term><parameter>--host=$LFS_TGT, --build=$(../glibc-&glibc-version;/scripts/config.guess)</parameter></term>
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| 79 | <listitem>
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| 80 | <para>The combined effect of these switches is that Glibc's build system
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| 81 | configures itself to cross-compile, using the cross-linker and
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| 82 | cross-compiler in <filename class="directory">/tools</filename>.</para>
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| 83 | </listitem>
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| 84 | </varlistentry>
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| 85 |
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[1f7ca93] | 86 | <varlistentry>
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| 87 | <term><parameter>--disable-profile</parameter></term>
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| 88 | <listitem>
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| 89 | <para>This builds the libraries without profiling information. Omit
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| 90 | this option if profiling on the temporary tools is necessary.</para>
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| 91 | </listitem>
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| 92 | </varlistentry>
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| 93 |
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| 94 | <varlistentry>
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| 95 | <term><parameter>--enable-add-ons</parameter></term>
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| 96 | <listitem>
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| 97 | <para>This tells Glibc to use the NPTL add-on as its threading
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| 98 | library.</para>
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| 99 | </listitem>
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| 100 | </varlistentry>
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| 101 |
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| 102 | <varlistentry>
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[3532721] | 103 | <term><parameter>--enable-kernel=2.6.18</parameter></term>
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[1f7ca93] | 104 | <listitem>
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| 105 | <para>This tells Glibc to compile the library with support
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[3532721] | 106 | for 2.6.18 and later Linux kernels. Workarounds for older
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| 107 | kernels are not enabled.</para>
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[1f7ca93] | 108 | </listitem>
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| 109 | </varlistentry>
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| 110 |
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| 111 | <varlistentry>
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| 112 | <term><parameter>--with-headers=/tools/include</parameter></term>
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| 113 | <listitem>
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| 114 | <para>This tells Glibc to compile itself against the headers recently
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| 115 | installed to the tools directory, so that it knows exactly what
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| 116 | features the kernel has and can optimize itself accordingly.</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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[4e82d47] | 121 | <term><parameter>libc_cv_forced_unwind=yes</parameter></term>
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[1f7ca93] | 122 | <listitem>
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[4e82d47] | 123 | <para>The build requires support for forced unwind, but because it is
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| 124 | being cross compiled, it cannot auto detect it. Setting this variable
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[1cdaff9] | 125 | on the command line explicitly tells the
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| 126 | <command>configure</command> script that support is available.</para>
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[4e82d47] | 127 | </listitem>
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| 128 | </varlistentry>
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| 129 | <varlistentry>
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| 130 | <term><parameter>libc_cv_c_cleanup=yes</parameter></term>
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| 131 | <listitem>
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| 132 | <para>The build also requires support for C cleanup handling, which it
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| 133 | cannot auto detect when being cross compiled. Enable it explicitly.</para>
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[1f7ca93] | 134 | </listitem>
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| 135 | </varlistentry>
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| 136 |
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| 137 | </variablelist>
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| 138 |
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| 139 | <para>During this stage the following warning might appear:</para>
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| 140 |
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| 141 | <blockquote>
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| 142 | <screen><computeroutput>configure: WARNING:
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| 143 | *** These auxiliary programs are missing or
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[81fd230] | 144 | *** incompatible versions: msgfmt
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| 145 | *** some features will be disabled.
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[1f7ca93] | 146 | *** Check the INSTALL file for required versions.</computeroutput></screen>
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| 147 | </blockquote>
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[81fd230] | 148 |
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[1f7ca93] | 149 | <para>The missing or incompatible <command>msgfmt</command> program is
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[5f7456b] | 150 | generally harmless. This <command>msgfmt</command> program is part of the
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| 151 | Gettext package which the host distribution should provide.</para>
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[81fd230] | 152 |
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[1f7ca93] | 153 | <para>Compile the package:</para>
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[73aedd1d] | 154 |
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[0445a3d] | 155 | <screen><userinput remap="make">make</userinput></screen>
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[73aedd1d] | 156 |
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[0abc697] | 157 | <para>This package does come with a test suite, however, it cannot be
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| 158 | run at this time because we do not have a C++ compiler yet.</para>
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[81fd230] | 159 |
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[ca2f862e] | 160 | <note>
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| 161 | <para>The test suite also requires locale data to be installed in order to run
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[90674770] | 162 | successfully. Locale data provides information to the system regarding
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[ca2f862e] | 163 | such things as the date, time, and currency formats accepted and output by
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| 164 | system utilities. If the test suites are not being run in this chapter
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| 165 | (as per the recommendation), there is no need to install the locales now.
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| 166 | The appropriate locales will be installed in the next chapter. To install
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| 167 | the Glibc locales anyway, use instructions from <xref
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| 168 | linkend="ch-system-glibc" role="."/></para>
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| 169 | </note>
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| 170 |
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[1f7ca93] | 171 | <para>Install the package:</para>
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[73aedd1d] | 172 |
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[0445a3d] | 173 | <screen><userinput remap="install">make install</userinput></screen>
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[73aedd1d] | 174 |
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[1f7ca93] | 175 | </sect2>
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[bc82645e] | 176 |
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[1f7ca93] | 177 | <sect2 role="content">
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| 178 | <title/>
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[81fd230] | 179 |
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[1f7ca93] | 180 | <para>Details on this package are located in
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| 181 | <xref linkend="contents-glibc" role="."/></para>
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| 182 |
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| 183 | </sect2>
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[81fd230] | 184 |
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[1f7ca93] | 185 | </sect1>
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