1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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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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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 | <!-- Common GCC-Static -->
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9 |
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10 | <sect1 id="ch-cross-tools-gcc-static" role="wrap">
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11 | <?dbhtml filename="gcc-static.html"?>
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12 |
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13 | <title>Cross GCC-&gcc-version; - Static</title>
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14 |
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15 | <indexterm zone="ch-cross-tools-gcc-static">
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16 | <primary sortas="a-GCC">GCC</primary>
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17 | <secondary>cross tools, static</secondary>
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18 | </indexterm>
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19 |
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20 | <sect2 role="package">
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21 | <title/>
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22 |
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23 | <para>The GCC package contains the GNU compiler collection, which includes
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24 | the C and C++ compilers.</para>
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25 |
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26 | </sect2>
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27 |
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28 | <sect2 role="installation">
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29 | <title os="a">Installation of Cross GCC Compiler with Static libgcc
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30 | and no Threads</title>
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31 |
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32 | <para os="aa">In order to work with musl-libc, GCC needs to be patched:</para>
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33 |
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34 | <screen os="ab"><userinput>patch -Np1 -i ../&gcc-musl-patch;</userinput></screen>
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35 |
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36 | <para os="b">GCC requires the GMP, MPFR, and MPC packages to either be
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37 | present on the host or to be present in source form within the gcc source
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38 | tree. Unpack these into the GCC directory after unpacking GCC:</para>
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39 |
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40 | <screen os="ba"><userinput>tar xf ../mpfr-&mpfr-version;.tar.bz2
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41 | mv -v mpfr-&mpfr-version; mpfr
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42 | tar xf ../gmp-&gmp-version;.tar.bz2
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43 | mv -v gmp-&gmp-version; gmp
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44 | tar xf ../mpc-&mpc-version;.tar.gz
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45 | mv -v mpc-&mpc-version; mpc</userinput></screen>
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46 |
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47 | <para os="c">The GCC documentation recommends building GCC outside of the source
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48 | directory in a dedicated build directory:</para>
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49 |
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50 | <screen os="d"><userinput>mkdir -v ../gcc-build
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51 | cd ../gcc-build</userinput></screen>
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52 |
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53 | <para os="e">Prepare GCC for compilation:</para>
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54 |
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55 | <!-- This is the common configure line for GCC-Static. -->
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56 | <!-- It's not actually used by any arch but is here for reference. -->
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57 | <screen os="ae"><userinput>../gcc-&gcc-version;/configure \
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58 | --prefix=${CLFS}/cross-tools \
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59 | --build=${CLFS_HOST} \
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60 | --host=${CLFS_HOST} \
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61 | --target=${CLFS_TARGET} \
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62 | --with-sysroot=${CLFS}/cross-tools/sysroot \
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63 | --disable-nls \
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64 | --disable-shared \
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65 | --without-headers \
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66 | --with-newlib \
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67 | --disable-decimal-float \
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68 | --disable-libgomp \
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69 | --disable-libmudflap \
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70 | --disable-libssp \
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71 | --disable-libatomic \
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72 | --disable-libquadmath \
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73 | --disable-threads \
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74 | --enable-languages=c \
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75 | --disable-multilib</userinput></screen>
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76 |
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77 | <variablelist os="af">
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78 | <title>The meaning of the configure options:</title>
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79 |
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80 | <varlistentry os="af1">
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81 | <term><parameter>--prefix=${CLFS}/cross-tools</parameter></term>
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82 | <listitem>
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83 | <para>This tells the configure script to prepare to install the
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84 | package in the <filename class="directory">${CLFS}/cross-tools</filename>
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85 | directory.</para>
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86 | </listitem>
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87 | </varlistentry>
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88 |
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89 | <varlistentry os="af2">
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90 | <term><parameter>--build=${CLFS_HOST}</parameter></term>
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91 | <listitem>
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92 | <para>This tells the configure script the triplet to use to build GCC.
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93 | It will use ${CLFS_HOST} as that's where it's being built.</para>
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94 | </listitem>
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95 | </varlistentry>
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96 |
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97 | <varlistentry os="af3">
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98 | <term><parameter>--host=${CLFS_HOST}</parameter></term>
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99 | <listitem>
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100 | <para>This tells the configure script the triplet of the machine GCC
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101 | will be executed on when actually cross compiling. It will use
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102 | ${CLFS_HOST} as that's where GCC will execute when cross compiling
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103 | software later.</para>
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104 | </listitem>
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105 | </varlistentry>
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106 |
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107 | <varlistentry os="af4">
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108 | <term><parameter>--target=${CLFS_TARGET}</parameter></term>
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109 | <listitem>
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110 | <para>This tells the configure script the triplet of the machine GCC
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111 | will build executables for. It will use ${CLFS_TARGET} so that software
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112 | compiled with this version of GCC can be executed on the embedded machine
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113 | target.</para>
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114 | </listitem>
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115 | </varlistentry>
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116 |
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117 | <varlistentry os="af5">
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118 | <term><parameter>--with-sysroot=${CLFS}/cross-tools/sysroot</parameter></term>
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119 | <listitem>
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120 | <para>This tells configure that ${CLFS}/cross-tools/sysroot is going
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121 | to be the temporary root of our system. It will now use the specified
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122 | sysroot as a prefix of the default search paths.</para>
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123 | </listitem>
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124 | </varlistentry>
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125 |
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126 | <varlistentry os="af6">
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127 | <term><parameter>--disable-nls</parameter></term>
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128 | <listitem>
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129 | <para>This disables internationalization as i18n is not needed for the
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130 | cross-compile tools.</para>
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131 | </listitem>
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132 | </varlistentry>
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133 |
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134 | <varlistentry os="af7">
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135 | <term><parameter>--disable-shared</parameter></term>
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136 | <listitem>
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137 | <para>Disables the creation of the shared libraries.</para>
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138 | </listitem>
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139 | </varlistentry>
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140 |
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141 | <varlistentry os="af11">
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142 | <term><parameter>--without-headers</parameter></term>
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143 | <listitem>
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144 | <para>Tells configure to not use any headers from any C libraries.
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145 | This is needed as we haven't yet built the C library and to prevent
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146 | influence from the host environment.</para>
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147 | </listitem>
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148 | </varlistentry>
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149 |
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150 | <varlistentry os="af12">
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151 | <term><parameter>--with-newlib</parameter></term>
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152 | <listitem>
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153 | <para>Tells configure to build libgcc without needing any C
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154 | libraries.</para>
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155 | </listitem>
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156 | </varlistentry>
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157 |
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158 | <varlistentry os="af13">
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159 | <term><parameter>--disable-decimal-float</parameter></term>
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160 | <listitem>
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161 | <para>Tells configure to disable IEEE 754-2008 decimal floating
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162 | point support. Decimal floating point support isn't needed yet.</para>
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163 | </listitem>
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164 | </varlistentry>
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165 |
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166 | <varlistentry os="af14">
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167 | <term><parameter>--disable-libgomp</parameter></term>
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168 | <listitem>
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169 | <para>Tells configure to not build the GOMP run-time libraries.
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170 | GOMP is the GNU implementation of OpenMP, a API for shared-memory
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171 | parallel programming.</para>
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172 | </listitem>
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173 | </varlistentry>
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174 |
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175 | <varlistentry os="af15">
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176 | <term><parameter>--disable-libmudflap</parameter></term>
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177 | <listitem>
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178 | <para>Tells configure to not build libmudflap. Mudflap is a
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179 | library that can be used to help check for proper pointer usage.</para>
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180 | </listitem>
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181 | </varlistentry>
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182 |
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183 | <varlistentry os="af16">
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184 | <term><parameter>--disable-libssp</parameter></term>
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185 | <listitem>
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186 | <para>Tells configure not to build run-time libraries for stack
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187 | smashing detection.</para>
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188 | </listitem>
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189 | </varlistentry>
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190 |
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191 | <varlistentry os="af17">
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192 | <term><parameter>--disable-libatomic</parameter></term>
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193 | <listitem>
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194 | <para>Tells configure not to build atomic operations.</para>
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195 | </listitem>
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196 | </varlistentry>
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197 |
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198 | <varlistentry os="af18">
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199 | <term><parameter>--disable-libquadmath</parameter></term>
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200 | <listitem>
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201 | <para>Tells configure not to build quad math operations.</para>
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202 | </listitem>
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203 | </varlistentry>
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204 |
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205 | <varlistentry os="af19">
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206 | <term><parameter>--disable-threads</parameter></term>
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207 | <listitem>
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208 | <para>This will prevent GCC from looking for the multi-thread
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209 | include files, since they haven't been created for this architecture
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210 | yet. GCC will be able to find the multi-thread information after
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211 | the glib headers are created.</para>
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212 | </listitem>
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213 | </varlistentry>
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214 |
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215 | <varlistentry os="af20">
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216 | <term><parameter>--enable-languages=c</parameter></term>
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217 | <listitem>
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218 | <para>This option ensures that only the C compiler is built.</para>
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219 | </listitem>
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220 | </varlistentry>
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221 |
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222 | <varlistentry os="af21">
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223 | <term><parameter>--disable-multilib</parameter></term>
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224 | <listitem>
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225 | <para>This option specifies that multiple target libraries should
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226 | not be built.</para>
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227 | </listitem>
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228 | </varlistentry>
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229 |
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230 | </variablelist>
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231 |
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232 | <para os="ah">Continue with compiling the package:</para>
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233 |
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234 | <screen os="ai"><userinput>make all-gcc all-target-libgcc</userinput></screen>
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235 |
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236 | <para os="aj">Install the package:</para>
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237 |
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238 | <screen os="ak"><userinput>make install-gcc install-target-libgcc</userinput></screen>
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239 |
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240 | </sect2>
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241 |
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242 | <sect2 role="content">
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243 | <title/>
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244 |
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245 | <para>Details on this package are located in <xref
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246 | linkend="contents-gcc" role="."/></para>
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247 |
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248 | </sect2>
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249 |
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250 | </sect1>
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