source: chapter05/gcc-pass1.xml@ 8aa7fde

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Last change on this file since 8aa7fde was 8aa7fde, checked in by Bruce Dubbs <bdubbs@…>, 8 years ago

Remove unneeded confiugure switches from gcc.
Restore installation of udev-lfs support files.

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10567 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

  • Property mode set to 100644
File size: 10.7 KB
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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-extracted-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 \
72 $(find gcc/config -name linux64.h -o -name linux.h -o -name sysv4.h)
73do
74 cp -uv $file{,.orig}
75 sed -e 's@/lib\(64\)\?\(32\)\?/ld@/tools&amp;@g' \
76 -e 's@/usr@/tools@g' $file.orig &gt; $file
77 echo '
78#undef STANDARD_STARTFILE_PREFIX_1
79#undef STANDARD_STARTFILE_PREFIX_2
80#define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"
81#define STANDARD_STARTFILE_PREFIX_2 ""' &gt;&gt; $file
82 touch $file.orig
83done</userinput></screen>
84
85 <para>In case the above seems hard to follow, let's break it down a bit.
86 First we find all the files under the <filename
87 class="directory">gcc/config</filename> directory that are named either
88 <filename>linux.h</filename>, <filename>linux64.h</filename> or
89 <filename>sysv4.h</filename>. For each file found, we copy it to a file of
90 the same name but with an added suffix of <quote>.orig</quote>. Then the
91 first sed expression prepends <quote>/tools</quote> to every instance of
92 <quote>/lib/ld</quote>, <quote>/lib64/ld</quote> or
93 <quote>/lib32/ld</quote>, while the second one replaces hard-coded
94 instances of <quote>/usr</quote>. Next, we add our define statements which
95 alter the default startfile prefix to the end of the file. Note that the
96 trailing <quote>/</quote> in <quote>/tools/lib/</quote> is required.
97 Finally, we use <command>touch</command> to update the timestamp on the
98 copied files. When used in conjunction with <command>cp -u</command>, this
99 prevents unexpected changes to the original files in case the commands are
100 inadvertently run twice. </para>
101
102 <para>GCC doesn't detect stack protection correctly, which causes problems
103 for the build of Glibc-&glibc-version;, so fix that by issuing the following
104 command:</para>
105
106<screen><userinput remap="pre">sed -i '/k prot/agcc_cv_libc_provides_ssp=yes' gcc/configure</userinput></screen>
107
108 <para>The GCC documentation recommends building GCC outside of the
109 source directory in a dedicated build directory:</para>
110
111<screen><userinput remap="pre">mkdir -v ../gcc-build
112cd ../gcc-build</userinput></screen>
113
114 <para>Prepare GCC for compilation:</para>
115
116<screen><userinput remap="configure">../gcc-&gcc-version;/configure \
117 --target=$LFS_TGT \
118 --prefix=/tools \
119 --with-sysroot=$LFS \
120 --with-newlib \
121 --without-headers \
122 --with-local-prefix=/tools \
123 --with-native-system-header-dir=/tools/include \
124 --disable-nls \
125 --disable-shared \
126 --disable-multilib \
127 --disable-decimal-float \
128 --disable-threads \
129 --disable-libatomic \
130 --disable-libgomp \
131 --disable-libitm \
132 --disable-libquadmath \
133 --disable-libsanitizer \
134 --disable-libssp \
135 --disable-libvtv \
136 --disable-libcilkrts \
137 --disable-libstdc++-v3 \
138 --enable-languages=c,c++</userinput></screen>
139 <variablelist>
140 <title>The meaning of the configure options:</title>
141
142 <varlistentry>
143 <term><parameter>--with-newlib</parameter></term>
144 <listitem>
145 <para>Since a working C library is not yet available, this ensures
146 that the inhibit_libc constant is defined when building libgcc. This prevents
147 the compiling of any code that requires libc support.</para>
148 </listitem>
149 </varlistentry>
150
151 <varlistentry>
152 <term><parameter>--without-headers</parameter></term>
153 <listitem>
154 <para>When creating a complete cross-compiler, GCC requires
155 standard headers compatible with the target system. For our
156 purposes these headers will not be needed. This switch prevents
157 GCC from looking for them.</para>
158 </listitem>
159 </varlistentry>
160
161 <varlistentry>
162 <term><parameter>--with-local-prefix=/tools</parameter></term>
163 <listitem>
164 <para>The local prefix is the location in the system that GCC will search
165 for locally installed include files. The default is <filename>/usr/local</filename>.
166 Setting this to <filename>/tools</filename> helps keep the host location of
167 <filename>/usr/local</filename> out of this GCC's search path.</para>
168 </listitem>
169 </varlistentry>
170
171 <varlistentry>
172 <term><parameter>--with-native-system-header-dir=/tools/include</parameter></term>
173 <listitem>
174 <para>By default GCC searches <filename>/usr/include</filename> for system
175 headers. In conjunction with the sysroot switch, this would translate normally
176 to <filename>$LFS/usr/include</filename>. However the headers that will be installed
177 in the next two sections will go to <filename>$LFS/tools/include</filename>. This
178 switch ensures that gcc will find them correctly. In the second pass of GCC, this
179 same switch will ensure that no headers from the host system are found.</para>
180 </listitem>
181 </varlistentry>
182
183 <varlistentry>
184 <term><parameter>--disable-shared</parameter></term>
185 <listitem>
186 <para>This switch forces GCC to link its internal libraries
187 statically. We do this to avoid possible issues with the host
188 system.</para>
189 </listitem>
190 </varlistentry>
191
192 <varlistentry>
193 <term><parameter>--disable-decimal-float, --disable-threads,
194 --disable-libatomic, --disable-libgomp, --disable-libitm,
195 --disable-libmudflap, --disable-libquadmath, --disable-libsanitizer,
196 --disable-libssp, --disable-libstdc++-v3</parameter></term>
197 <listitem>
198 <para>These switches disable support for the decimal floating point
199 extension, threading, libatomic, libgomp, libitm, libmudflap,
200 libquadmath, libsanitizer, libssp and the C++ standard library
201 respectively. These features will fail to compile when building a
202 cross-compiler and are not necessary for the task of cross-compiling
203 the temporary libc.</para>
204 </listitem>
205 </varlistentry>
206
207 <varlistentry>
208 <term><parameter>--disable-multilib</parameter></term>
209 <listitem>
210 <para>On x86_64, LFS does not yet support a multilib configuration.
211 This switch is harmless for x86.</para>
212 </listitem>
213 </varlistentry>
214
215 <varlistentry>
216 <term><parameter>--enable-languages=c,c++</parameter></term>
217 <listitem>
218 <para>This option ensures that only the C and C++ compilers are built.
219 These are the only languages needed now.</para>
220 </listitem>
221 </varlistentry>
222
223 </variablelist>
224
225 <para>Compile GCC by running:</para>
226
227<screen><userinput remap="make">make</userinput></screen>
228
229 <para>Compilation is now complete. At this point, the test suite would
230 normally be run, but, as mentioned before, the test suite framework is
231 not in place yet. The benefits of running the tests at this point
232 are minimal since the programs from this first pass will soon be
233 replaced.</para>
234
235 <para>Install the package:</para>
236
237<screen><userinput remap="install">make install</userinput></screen>
238<!--
239 <para>Using <parameter>- -disable-shared</parameter> means that the
240 <filename>libgcc_eh.a</filename> file isn't created and installed. The
241 Glibc package depends on this library as it uses
242 <parameter>-lgcc_eh</parameter> within its build system. This dependency
243 can be satisfied by creating a symlink to <filename>libgcc.a</filename>,
244 since that file will end up containing the objects normally contained in
245 <filename>libgcc_eh.a</filename>:</para>
246
247<screen><userinput remap="install">ln -sv libgcc.a `$LFS_TGT-gcc -print-libgcc-file-name | sed 's/libgcc/&amp;_eh/'`</userinput></screen>
248-->
249 </sect2>
250
251 <sect2 role="content">
252 <title/>
253
254 <para>Details on this package are located in
255 <xref linkend="contents-gcc" role="."/></para>
256
257 </sect2>
258
259</sect1>
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