source: chapter05/gcc-pass1.xml@ a05450f

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Last change on this file since a05450f was a05450f, checked in by DJ Lucas <dj@…>, 5 years ago

Fix description of commands in gcc pass1.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11206 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-tools-gcc-pass1" role="wrap">
9 <?dbhtml filename="gcc-pass1.html"?>
10
11 <sect1info condition="script">
12 <productname>gcc</productname>
13 <productnumber>&gcc-version;</productnumber>
14 <address>&gcc-url;</address>
15 </sect1info>
16
17 <title>GCC-&gcc-version; - Pass 1</title>
18
19 <indexterm zone="ch-tools-gcc-pass1">
20 <primary sortas="a-GCC">GCC</primary>
21 <secondary>tools, pass 1</secondary>
22 </indexterm>
23
24 <sect2 role="package">
25 <title/>
26
27 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
28 href="../chapter06/gcc.xml"
29 xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
30
31 <segmentedlist>
32 <segtitle>&buildtime;</segtitle>
33 <segtitle>&diskspace;</segtitle>
34
35 <seglistitem>
36 <seg>&gcc-ch5p1-sbu;</seg>
37 <seg>&gcc-ch5p1-du;</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Cross GCC</title>
45
46 <para>GCC now requires the GMP, MPFR and MPC packages. As these packages may
47 not be included in your host distribution, they will be built with
48 GCC. Unpack each package into the GCC source directory and rename the
49 resulting directories so the GCC build procedures will automatically
50 use them:</para>
51
52 <note><para>There are frequent misunderstandings about this chapter. The
53 procedures are the same as every other chapter as explained earlier (<xref
54 linkend='buildinstr'/>). First extract the gcc tarball from the sources
55 directory and then change to the directory created. Only then should you
56 proceed with the instructions below.</para></note>
57
58<screen><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
59mv -v mpfr-&mpfr-version; mpfr
60tar -xf ../gmp-&gmp-version;.tar.xz
61mv -v gmp-&gmp-version; gmp
62tar -xf ../mpc-&mpc-version;.tar.gz
63mv -v mpc-&mpc-version; mpc</userinput></screen>
64
65 <para>The following command will change the location of GCC's default
66 dynamic linker to use the one installed in <filename
67 class="directory">/tools</filename>. It also removes <filename
68 class="directory">/usr/include</filename> from GCC's include search path.
69 Issue:</para>
70
71<screen><userinput remap="pre">for file in gcc/config/{linux,i386/linux{,64}}.h
72do
73 cp -uv $file{,.orig}
74 sed -e 's@/lib\(64\)\?\(32\)\?/ld@/tools&amp;@g' \
75 -e 's@/usr@/tools@g' $file.orig &gt; $file
76 echo '
77#undef STANDARD_STARTFILE_PREFIX_1
78#undef STANDARD_STARTFILE_PREFIX_2
79#define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"
80#define STANDARD_STARTFILE_PREFIX_2 ""' &gt;&gt; $file
81 touch $file.orig
82done</userinput></screen>
83
84 <para>In case the above seems hard to follow, let's break it down a bit.
85 First we copy the files <filename>gcc/config/linux.h</filename>,
86 <filename>gcc/config/i386/linux.h</filename>, and
87 <filename>gcc/config/i368/linux64.h</filename>. to a file of
88 the same name but with an added suffix of <quote>.orig</quote>. Then the
89 first sed expression prepends <quote>/tools</quote> to every instance of
90 <quote>/lib/ld</quote>, <quote>/lib64/ld</quote> or
91 <quote>/lib32/ld</quote>, while the second one replaces hard-coded
92 instances of <quote>/usr</quote>. Next, we add our define statements which
93 alter the default startfile prefix to the end of the file. Note that the
94 trailing <quote>/</quote> in <quote>/tools/lib/</quote> is required.
95 Finally, we use <command>touch</command> to update the timestamp on the
96 copied files. When used in conjunction with <command>cp -u</command>, this
97 prevents unexpected changes to the original files in case the commands are
98 inadvertently run twice.</para>
99
100 <para>Finally, on x86_64 hosts, set the default directory name for
101 64-bit libraries to <quote>lib</quote>:</para>
102
103<screen><userinput remap="pre">case $(uname -m) in
104 x86_64)
105 sed -e '/m64=/s/lib64/lib/' \
106 -i.orig gcc/config/i386/t-linux64
107 ;;
108esac</userinput></screen>
109
110<!--
111 <para>GCC doesn't detect stack protection correctly, which causes problems
112 for the build of Glibc-&glibc-version;, so fix that by issuing the following
113 command:</para>
114
115<screen><userinput remap="pre">sed -i '/k prot/agcc_cv_libc_provides_ssp=yes' gcc/configure</userinput></screen>
116-->
117
118<!--
119 <para>Also fix a problem identified upstream:</para>
120
121<screen><userinput remap="pre">sed -i 's/if \((code.*))\)/if (\1 \&amp;\&amp; \!DEBUG_INSN_P (insn))/' gcc/sched-deps.c</userinput></screen>
122-->
123 <para>The GCC documentation recommends building GCC
124 in a dedicated build directory:</para>
125
126<screen><userinput remap="pre">mkdir -v build
127cd build</userinput></screen>
128
129 <para>Prepare GCC for compilation:</para>
130
131<screen><userinput remap="configure">../configure \
132 --target=$LFS_TGT \
133 --prefix=/tools \
134 --with-glibc-version=2.11 \
135 --with-sysroot=$LFS \
136 --with-newlib \
137 --without-headers \
138 --with-local-prefix=/tools \
139 --with-native-system-header-dir=/tools/include \
140 --disable-nls \
141 --disable-shared \
142 --disable-multilib \
143 --disable-decimal-float \
144 --disable-threads \
145 --disable-libatomic \
146 --disable-libgomp \
147 --disable-libmpx \
148 --disable-libquadmath \
149 --disable-libssp \
150 --disable-libvtv \
151 --disable-libstdcxx \
152 --enable-languages=c,c++</userinput></screen>
153 <variablelist>
154 <title>The meaning of the configure options:</title>
155
156 <varlistentry>
157 <term><parameter>--with-newlib</parameter></term>
158 <listitem>
159 <para>Since a working C library is not yet available, this ensures
160 that the inhibit_libc constant is defined when building libgcc. This prevents
161 the compiling of any code that requires libc support.</para>
162 </listitem>
163 </varlistentry>
164
165 <varlistentry>
166 <term><parameter>--without-headers</parameter></term>
167 <listitem>
168 <para>When creating a complete cross-compiler, GCC requires
169 standard headers compatible with the target system. For our
170 purposes these headers will not be needed. This switch prevents
171 GCC from looking for them.</para>
172 </listitem>
173 </varlistentry>
174
175 <varlistentry>
176 <term><parameter>--with-local-prefix=/tools</parameter></term>
177 <listitem>
178 <para>The local prefix is the location in the system that GCC will search
179 for locally installed include files. The default is <filename>/usr/local</filename>.
180 Setting this to <filename>/tools</filename> helps keep the host location of
181 <filename>/usr/local</filename> out of this GCC's search path.</para>
182 </listitem>
183 </varlistentry>
184
185 <varlistentry>
186 <term><parameter>--with-native-system-header-dir=/tools/include</parameter></term>
187 <listitem>
188 <para>By default GCC searches <filename>/usr/include</filename> for system
189 headers. In conjunction with the sysroot switch, this would translate normally
190 to <filename>$LFS/usr/include</filename>. However the headers that will be installed
191 in the next two sections will go to <filename>$LFS/tools/include</filename>. This
192 switch ensures that gcc will find them correctly. In the second pass of GCC, this
193 same switch will ensure that no headers from the host system are found.</para>
194 </listitem>
195 </varlistentry>
196
197 <varlistentry>
198 <term><parameter>--disable-shared</parameter></term>
199 <listitem>
200 <para>This switch forces GCC to link its internal libraries
201 statically. We do this to avoid possible issues with the host
202 system.</para>
203 </listitem>
204 </varlistentry>
205
206 <varlistentry>
207 <term><parameter>--disable-decimal-float, --disable-threads,
208 --disable-libatomic, --disable-libgomp, --disable-libmpx,
209 --disable-libquadmath, --disable-libssp, --disable-libvtv,
210 --disable-libstdcxx</parameter></term>
211 <listitem>
212 <para>These switches disable support for the decimal floating point
213 extension, threading, libatomic, libgomp, libmpx, libquadmath, libssp,
214 libvtv, and the C++ standard library respectively. These features
215 will fail to compile when building a cross-compiler and are not
216 necessary for the task of cross-compiling the temporary libc.</para>
217 </listitem>
218 </varlistentry>
219
220 <varlistentry>
221 <term><parameter>--disable-multilib</parameter></term>
222 <listitem>
223 <para>On x86_64, LFS does not yet support a multilib configuration.
224 This switch is harmless for x86.</para>
225 </listitem>
226 </varlistentry>
227
228 <varlistentry>
229 <term><parameter>--enable-languages=c,c++</parameter></term>
230 <listitem>
231 <para>This option ensures that only the C and C++ compilers are built.
232 These are the only languages needed now.</para>
233 </listitem>
234 </varlistentry>
235
236 </variablelist>
237
238 <para>Compile GCC by running:</para>
239
240<screen><userinput remap="make">make</userinput></screen>
241
242 <para>Compilation is now complete. At this point, the test suite would
243 normally be run, but, as mentioned before, the test suite framework is
244 not in place yet. The benefits of running the tests at this point
245 are minimal since the programs from this first pass will soon be
246 replaced.</para>
247
248 <para>Install the package:</para>
249
250<screen><userinput remap="install">make install</userinput></screen>
251<!--
252 <para>Using <parameter>- -disable-shared</parameter> means that the
253 <filename>libgcc_eh.a</filename> file isn't created and installed. The
254 Glibc package depends on this library as it uses
255 <parameter>-lgcc_eh</parameter> within its build system. This dependency
256 can be satisfied by creating a symlink to <filename>libgcc.a</filename>,
257 since that file will end up containing the objects normally contained in
258 <filename>libgcc_eh.a</filename>:</para>
259
260<screen><userinput remap="install">ln -sv libgcc.a `$LFS_TGT-gcc -print-libgcc-file-name | sed 's/libgcc/&amp;_eh/'`</userinput></screen>
261-->
262 </sect2>
263
264 <sect2 role="content">
265 <title/>
266
267 <para>Details on this package are located in
268 <xref linkend="contents-gcc" role="."/></para>
269
270 </sect2>
271
272</sect1>
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