| 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 | <sect1 id="ch-cross-tools-gcc-static" role="wrap">
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| 9 | <?dbhtml filename="gcc-static.html"?>
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| 10 |
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| 11 | <title>Cross GCC-&gcc-version; - Static</title>
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| 12 |
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| 13 | <indexterm zone="ch-cross-tools-gcc-static">
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| 14 | <primary sortas="a-GCC">GCC</primary>
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| 15 | <secondary>cross tools, static</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/2001/XInclude"
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| 19 | href="../../final-system/common/gcc.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 Cross GCC Compiler with Static libgcc
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| 24 | and no Threads</title>
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| 25 |
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| 26 | <para os="e">Here we will compile GCC, as a cross-compiler that will create
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| 27 | executables for our target architecture, statically so that it will not
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| 28 | need to look for Glibc's startfiles, which do not yet exist in
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| 29 | <filename class="directory">/tools</filename>. We will use this
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| 30 | cross-compiler, plus the cross-linker we have just installed with Binutils,
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| 31 | to compile Glibc. After Glibc is installed into
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| 32 | <filename class="directory">/tools</filename>, we can rebuild GCC
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| 33 | so that it will then be able to build executables that link against the
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| 34 | libraries in <filename class="directory">/tools</filename>.</para>
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| 35 |
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| 36 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 37 | href="../../final-system/common/gcc.xml"
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| 38 | xpointer="xpointer(//*[@os='p1'])"/>
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| 39 |
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| 40 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 41 | href="../../final-system/common/gcc.xml"
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| 42 | xpointer="xpointer(//*[@os='p2'])"/>
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| 43 |
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| 44 | <para os="aa">Make a couple of essential adjustments to GCC's specs
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| 45 | to ensure GCC uses our build environment:</para>
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| 46 |
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| 47 | <screen os="ab"><userinput>patch -Np1 -i ../&gcc-specs-patch;</userinput></screen>
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| 48 |
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| 49 | <para os="ag">Change the StartFile Spec so that GCC looks in
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| 50 | <filename class="directory">/tools</filename>:</para>
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| 51 |
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| 52 | <screen os="ah"><userinput>echo -en '\n#undef STANDARD_STARTFILE_PREFIX_1\n#define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"\n' >> gcc/config/linux.h
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| 53 | echo -en '\n#undef STANDARD_STARTFILE_PREFIX_2\n#define STANDARD_STARTFILE_PREFIX_2 ""\n' >> gcc/config/linux.h</userinput></screen>
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| 54 |
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| 55 | <para os="t1">We will create a dummy <filename>limits.h</filename> so
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| 56 | the build will not use the one provided by the host distro:</para>
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| 57 |
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| 58 | <screen os="t2"><userinput>touch /tools/include/limits.h</userinput></screen>
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| 59 |
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| 60 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 61 | href="../../final-system/common/gcc.xml"
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| 62 | xpointer="xpointer(//*[@os='f'])"/>
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| 63 |
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| 64 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 65 | href="../../final-system/common/gcc.xml"
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| 66 | xpointer="xpointer(//*[@os='g'])"/>
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| 67 |
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| 68 | <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
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| 69 | href="../../final-system/common/gcc.xml"
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| 70 | xpointer="xpointer(//*[@os='h'])"/>
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| 71 |
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| 72 | <screen os="al"><userinput>AR=ar LDFLAGS="-Wl,-rpath,/cross-tools/lib" \
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| 73 | ../gcc-&gcc-version;/configure --prefix=/cross-tools \
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| 74 | --build=${CLFS_HOST} --host=${CLFS_HOST} --target=${CLFS_TARGET} \
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| 75 | --with-sysroot=${CLFS} --with-local-prefix=/tools \
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| 76 | --with-native-system-header-dir=/tools/include --disable-nls \
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| 77 | --disable-shared --with-mpfr=/cross-tools --with-gmp=/cross-tools \
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| 78 | --with-isl=/cross-tools --with-cloog=/cross-tools --with-mpc=/cross-tools \
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| 79 | --without-headers --with-newlib --disable-decimal-float --disable-libgomp \
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| 80 | --disable-libmudflap --disable-libssp --disable-libatomic --disable-libitm \
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| 81 | --disable-libsanitizer --disable-libquadmath --disable-threads \
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| 82 | --disable-multilib --disable-target-zlib --with-system-zlib \
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| 83 | --enable-languages=c --enable-checking=release</userinput></screen>
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| 84 |
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| 85 | <variablelist os="am">
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| 86 | <title>The meaning of the new configure options:</title>
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| 87 |
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| 88 | <varlistentry>
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| 89 | <term><parameter>--build=${CLFS_HOST}</parameter></term>
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| 90 | <listitem>
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| 91 | <para>This specifies the system on which the cross-compiler is being
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| 92 | built.</para>
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| 93 | </listitem>
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| 94 | </varlistentry>
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| 95 |
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| 96 | <varlistentry>
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| 97 | <term><parameter>--with-local-prefix=/tools</parameter></term>
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| 98 | <listitem>
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| 99 | <para>The purpose of this switch is to remove <filename
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| 100 | class="directory">/usr/local/include</filename> from
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| 101 | <command>gcc</command>'s include search path. This is not
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| 102 | absolutely essential, however, it helps to minimize the
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| 103 | influence of the host system.</para>
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| 104 | </listitem>
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| 105 | </varlistentry>
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| 106 |
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| 107 | <varlistentry>
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| 108 | <term><parameter>--with-native-system-headers-dir=/tools/include</parameter></term>
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| 109 | <listitem>
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| 110 | <para>This switch ensures that GCC will search for the system headers
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| 111 | in <filename class="directory">/tools/include</filename> and that
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| 112 | host system headers will not be searched.</para>
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| 113 | </listitem>
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| 114 | </varlistentry>
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| 115 |
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| 116 | <varlistentry>
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| 117 | <term><parameter>--disable-shared</parameter></term>
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| 118 | <listitem>
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| 119 | <para>This tells GCC not to create a shared library.</para>
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| 120 | </listitem>
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| 121 | </varlistentry>
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| 122 |
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| 123 | <varlistentry>
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| 124 | <term><parameter>--without-headers</parameter></term>
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| 125 | <listitem>
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| 126 | <para>Disables GCC from using the target's Libc when cross compiling.</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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| 131 | <term><parameter>--with-newlib</parameter></term>
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| 132 | <listitem>
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| 133 | <para>This causes GCC to enable the <envar>inhibit_libc</envar> flag,
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| 134 | which prevents <filename class="libraryfile">libgcc</filename>
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| 135 | from building code that uses libc support.</para>
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| 136 | </listitem>
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| 137 | </varlistentry>
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| 138 |
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| 139 | <varlistentry>
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| 140 | <term><parameter>--disable-decimal-float</parameter></term>
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| 141 | <listitem>
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| 142 | <para>Disables support for the C decimal floating point extension.</para>
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| 143 | </listitem>
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| 144 | </varlistentry>
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| 145 |
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| 146 | <varlistentry>
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| 147 | <term><parameter>--disable-lib*</parameter></term>
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| 148 | <listitem>
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| 149 | <para>These options prevent GCC from building a number of libraries
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| 150 | that are not needed at this time.</para>
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| 151 | </listitem>
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| 152 | </varlistentry>
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| 153 |
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| 154 | <varlistentry>
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| 155 | <term><parameter>--disable-threads</parameter></term>
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| 156 | <listitem>
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| 157 | <para>This will prevent GCC from looking for the multi-thread
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| 158 | include files, since they haven't been created for this architecture
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| 159 | yet. GCC will be able to find the multi-thread information after
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| 160 | the Glibc headers are created.</para>
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| 161 | </listitem>
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| 162 | </varlistentry>
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| 163 |
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| 164 | <varlistentry>
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| 165 | <term><parameter>--disable-target-zlib</parameter></term>
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| 166 | <listitem>
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| 167 | <para>This tells GCC not to build the copy of Zlib in its
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| 168 | source tree.</para>
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| 169 | </listitem>
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| 170 | </varlistentry>
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| 171 |
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| 172 | <varlistentry>
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| 173 | <term><parameter>--with-system-zlib</parameter></term>
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| 174 | <listitem>
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| 175 | <para>This tells GCC to link to the system-installed zlib instead
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| 176 | of the one in its source tree.</para>
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| 177 | </listitem>
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| 178 | </varlistentry>
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| 179 |
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| 180 | <varlistentry>
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| 181 | <term><parameter>--enable-languages=c</parameter></term>
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| 182 | <listitem>
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| 183 | <para>This option ensures that only the C compiler is built.</para>
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| 184 | </listitem>
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| 185 | </varlistentry>
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| 186 |
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| 187 | <varlistentry>
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| 188 | <term><parameter>--enable-checking=release</parameter></term>
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| 189 | <listitem>
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| 190 | <para>This option selects the complexity of the internal consistency checks and adds error checking within the compiler.</para>
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| 191 | </listitem>
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| 192 | </varlistentry>
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| 193 |
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| 194 | </variablelist>
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| 195 |
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| 196 | <para os="an">Continue with compiling the package:</para>
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| 197 |
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| 198 | <screen os="ao"><userinput>make all-gcc all-target-libgcc</userinput></screen>
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| 199 |
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| 200 | <variablelist os="ap">
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| 201 | <title>The meaning of the new make options:</title>
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| 202 |
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| 203 | <varlistentry>
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| 204 | <term><parameter>all-gcc all-target-libgcc</parameter></term>
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| 205 | <listitem>
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| 206 | <para>Compiles only the parts of GCC that are needed at this time,
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| 207 | rather than the full package.</para>
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| 208 | </listitem>
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| 209 | </varlistentry>
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| 210 |
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| 211 | </variablelist>
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| 212 |
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| 213 | <para os="aq">Install the package:</para>
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| 214 |
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| 215 | <screen os="ar"><userinput>make install-gcc install-target-libgcc</userinput></screen>
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| 216 |
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| 217 | </sect2>
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| 218 |
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| 219 | <sect2 role="content">
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| 220 | <title/>
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| 221 |
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| 222 | <para>Details on this package are located in <xref
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| 223 | linkend="contents-gcc" role="."/></para>
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| 224 |
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| 225 | </sect2>
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| 226 |
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| 227 | </sect1>
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