1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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5 | %general-entities;
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6 | ]>
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7 |
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8 | <sect1 id="ch-cross-tools-glibc-headers" role="wrap">
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9 | <?dbhtml filename="glibc-headers.html"?>
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10 |
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11 | <title>Glibc-&glibc-version; Headers</title>
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12 |
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13 | <indexterm zone="ch-cross-tools-glibc-headers">
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14 | <primary sortas="a-Glibc">Glibc</primary>
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15 | <secondary>cross tools, headers</secondary>
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16 | </indexterm>
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17 |
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18 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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19 | href="../../final-system/common/glibc.xml"
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20 | xpointer="xpointer(//*[@role='package'])"/>
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21 |
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22 | <sect2 role="installation">
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23 | <title>Installation of Glibc Headers</title>
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24 |
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25 | <para os="s1">The following sed removes a dependency of gcc 3.4.x from
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26 | the glibc we are using in cross-lfs. The reason we are changing it is
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27 | because this only installs the headers, no compiling takes place. In the
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28 | next glibc chapter, we use the gcc that's built right after this chapter.</para>
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29 |
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30 | <screen os="s2"><userinput>cp configure{,.orig}
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31 | sed -e 's/3.4/3.[0-9]/g' configure.orig > configure</userinput></screen>
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32 |
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33 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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34 | href="../../final-system/common/glibc.xml"
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35 | xpointer="xpointer(//*[@os='e'])"/>
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36 |
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37 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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38 | href="../../final-system/common/glibc.xml"
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39 | xpointer="xpointer(//*[@os='f'])"/>
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40 |
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41 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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42 | href="../common/glibc.xml"
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43 | xpointer="xpointer(//*[@os='dd'])"/>
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44 |
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45 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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46 | href="../common/glibc.xml"
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47 | xpointer="xpointer(//*[@os='de'])"/>
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48 |
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49 | <para os="df">Glibc has an issue cross-compiling the headers, where it can
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50 | misdetect the capabilities of Binutils and decide they are inadequate. The
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51 | following line fixes this:</para>
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52 |
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53 | <screen os="dg"><userinput>echo "libc_cv_initfini_array=yes" >> config.cache
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54 | </userinput></screen>
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55 |
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56 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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57 | href="../../final-system/common/glibc.xml"
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58 | xpointer="xpointer(//*[@os='g'])"/>
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59 |
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60 | <screen os="s3"><userinput>CC=gcc ../glibc-&glibc-version;/configure --prefix=/tools \
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61 | --host=${LFS_TARGET} --build=${LFS_HOST} \
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62 | --disable-sanity-checks --enable-kernel=2.6.0 \
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63 | --with-headers=/tools/include --cache-file=config.cache \
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64 | --with-binutils=/cross-tools/${LFS_TARGET}/bin</userinput></screen>
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65 |
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66 | <warning os="e1">
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67 | <para><emphasis>Any</emphasis> error message you see about nptl at this point
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68 | can safely be ignored.</para>
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69 | </warning>
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70 |
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71 | <variablelist os="ca">
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72 | <title>The meaning of the configure options:</title>
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73 |
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74 | <varlistentry os="ca1">
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75 | <term><parameter>CC=gcc</parameter></term>
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76 | <listitem>
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77 | <para>Tells GLIBC to use the hosts GCC compiler.</para>
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78 | </listitem>
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79 | </varlistentry>
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80 |
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81 | <varlistentry os="ca2">
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82 | <term><parameter>--build=${LFS_HOST}</parameter></term>
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83 | <listitem>
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84 | <para>When used with --host, this creates a cross-architecture
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85 | executable that creates files for ${LFS_TARGET} but runs on ${LFS_HOST).</para>
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86 | </listitem>
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87 | </varlistentry>
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88 |
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89 | <varlistentry os="ca3">
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90 | <term><parameter>--host=${LFS_TARGET}</parameter></term>
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91 | <listitem>
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92 | <para>When used with --build, this creates a cross-architecture
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93 | executable that creates files for ${LFS_TARGET} but runs on ${LFS_HOST).</para>
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94 | </listitem>
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95 | </varlistentry>
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96 |
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97 | <varlistentry os="ca4">
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98 | <term><parameter>--disable-sanity-checks</parameter></term>
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99 | <listitem>
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100 | <para>This switch disables any checks that are in place.</para>
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101 | </listitem>
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102 | </varlistentry>
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103 |
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104 | <varlistentry os="ca5">
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105 | <term><parameter>--enable-kernel=2.6.0</parameter></term>
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106 | <listitem>
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107 | <para>This tells Glibc to compile the library with support
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108 | for 2.6.x Linux kernels.</para>
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109 | </listitem>
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110 | </varlistentry>
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111 |
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112 | <varlistentry os="ca6">
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113 | <term><parameter>--with-headers=/tools/include</parameter></term>
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114 | <listitem>
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115 | <para>This tells Glibc to compile itself against the headers
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116 | recently installed to the <filename class="directory">/tools</filename>
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117 | directory, so that it knows exactly what features the kernel has
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118 | and can optimize itself accordingly.</para>
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119 | </listitem>
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120 | </varlistentry>
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121 |
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122 | <varlistentry os="ca7">
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123 | <term><parameter>--with-binutils=/cross-tools/${LFS_TARGET}/bin</parameter></term>
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124 | <listitem>
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125 | <para>This tells GLIBC to use the binutils for our specific target architecture.</para>
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126 | </listitem>
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127 | </varlistentry>
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128 |
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129 | </variablelist>
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130 |
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131 | <para os="cb">Now, install the headers:</para>
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132 |
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133 | <screen os="cd"><userinput>make install-headers</userinput></screen>
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134 |
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135 | <para os="ce">Some files aren't installed by the above command, so we will copy the additional header files we need:</para>
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136 |
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137 | <para os="cf">First we will copy a common file over to <filename
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138 | class="directory">/tools/include</filename>:</para>
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139 |
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140 | <screen os="cg"><userinput>install -d /tools/include/bits
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141 | cp bits/stdio_lim.h /tools/include/bits</userinput></screen>
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142 |
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143 | <para os="ch">Now we will create a blank stub file:</para>
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144 |
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145 | <screen os="ci"><userinput>touch /tools/include/gnu/stubs.h</userinput></screen>
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146 |
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147 | <para os="cj">For NPTL we use the following command:</para>
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148 |
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149 | <screen os="ck"><userinput>cp ../glibc-&glibc-version;/nptl/sysdeps/pthread/pthread.h /tools/include/</userinput></screen>
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150 |
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151 | <para os="cl">Now we copy the architecture specific header over:</para>
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152 |
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153 | <screen os="cm"><userinput>cp ../glibc-&glibc-version;/nptl/sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h /tools/include/bits/</userinput></screen>
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154 |
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155 | </sect2>
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156 |
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157 | <sect2 role="content">
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158 | <title/>
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159 |
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160 | <para>Details on this package are located in <xref
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161 | linkend="contents-glibc" role="."/></para>
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162 |
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163 | </sect2>
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164 |
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165 | </sect1>
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