source: clfs-embedded/BOOK/cross-tools/common/gcc-static.xml@ e0d570e

Last change on this file since e0d570e was c4b2364, checked in by Andrew Bradford <andrew@…>, 10 years ago

gcc: Add notes for static vs final builds

To clarify that the first pass is mainly to build the libc and the
second pass uses that libc to build the actual cross compiler.
  • Property mode set to 100644
File size: 9.3 KB
Line 
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<!-- Common GCC-Static -->
9
10<sect1 id="ch-cross-tools-gcc-static" role="wrap">
11 <?dbhtml filename="gcc-static.html"?>
12
13 <title>GCC-&gcc-version; - Static</title>
14
15 <indexterm zone="ch-cross-tools-gcc-static">
16 <primary sortas="a-GCC">GCC</primary>
17 <secondary>cross tools, static</secondary>
18 </indexterm>
19
20 <sect2 role="package">
21 <title/>
22
23 <para>The GCC package contains the GNU compiler collection, which includes
24 the C compiler. This build of GCC is mainly done so that the C library
25 can be built next.</para>
26
27 </sect2>
28
29 <sect2 role="installation">
30 <title os="a">Installation of Cross GCC Compiler with Static libgcc
31 and no Threads</title>
32
33 <para os="aa">In order to work with musl, GCC needs to be patched:</para>
34
35<screen os="ab"><userinput>patch -Np1 -i ../&gcc-musl-patch;</userinput></screen>
36
37 <para os="b">GCC requires the GMP, MPFR, and MPC packages to either be
38 present on the host or to be present in source form within the gcc source
39 tree. Unpack these into the GCC directory after unpacking GCC:</para>
40
41<screen os="ba"><userinput>tar xf ../mpfr-&mpfr-version;.tar.bz2
42mv -v mpfr-&mpfr-version; mpfr
43tar xf ../gmp-&gmp-version;.tar.bz2
44mv -v gmp-&gmp-version; gmp
45tar xf ../mpc-&mpc-version;.tar.gz
46mv -v mpc-&mpc-version; mpc</userinput></screen>
47
48 <para os="c">The GCC documentation recommends building GCC outside of the source
49 directory in a dedicated build directory:</para>
50
51<screen os="d"><userinput>mkdir -v ../gcc-build
52cd ../gcc-build</userinput></screen>
53
54 <para os="e">Prepare GCC for compilation:</para>
55
56<!-- This is the common configure line for GCC-Static. -->
57<!-- It's not actually used by any arch but is here for reference. -->
58<screen os="ae"><userinput>../gcc-&gcc-version;/configure \
59 --prefix=${CLFS}/cross-tools \
60 --build=${CLFS_HOST} \
61 --host=${CLFS_HOST} \
62 --target=${CLFS_TARGET} \
63 --with-sysroot=${CLFS}/cross-tools/${CLFS_TARGET} \
64 --disable-nls \
65 --disable-shared \
66 --without-headers \
67 --with-newlib \
68 --disable-decimal-float \
69 --disable-libgomp \
70 --disable-libmudflap \
71 --disable-libssp \
72 --disable-libatomic \
73 --disable-libquadmath \
74 --disable-threads \
75 --enable-languages=c \
76 --disable-multilib \
77 --with-mpfr-include=$(pwd)/../gcc-&gcc-version;/mpfr/src \
78 --with-mpfr-lib=$(pwd)/mpfr/src/.libs</userinput></screen>
79
80 <variablelist os="af">
81 <title>The meaning of the configure options:</title>
82
83 <varlistentry os="af1">
84 <term><parameter>--prefix=${CLFS}/cross-tools</parameter></term>
85 <listitem>
86 <para>This tells the configure script to prepare to install the
87 package in the <filename class="directory">${CLFS}/cross-tools</filename>
88 directory.</para>
89 </listitem>
90 </varlistentry>
91
92 <varlistentry os="af2">
93 <term><parameter>--build=${CLFS_HOST}</parameter></term>
94 <listitem>
95 <para>This tells the configure script the triplet to use to build GCC.
96 It will use ${CLFS_HOST} as that's where it's being built.</para>
97 </listitem>
98 </varlistentry>
99
100 <varlistentry os="af3">
101 <term><parameter>--host=${CLFS_HOST}</parameter></term>
102 <listitem>
103 <para>This tells the configure script the triplet of the machine GCC
104 will be executed on when actually cross compiling. It will use
105 ${CLFS_HOST} as that's where GCC will execute when cross compiling
106 software later.</para>
107 </listitem>
108 </varlistentry>
109
110 <varlistentry os="af4">
111 <term><parameter>--target=${CLFS_TARGET}</parameter></term>
112 <listitem>
113 <para>This tells the configure script the triplet of the machine GCC
114 will build executables for. It will use ${CLFS_TARGET} so that software
115 compiled with this version of GCC can be executed on the embedded machine
116 target.</para>
117 </listitem>
118 </varlistentry>
119
120 <varlistentry os="af5">
121 <term><parameter>--with-sysroot=${CLFS}/cross-tools/${CLFS_TARGET}</parameter></term>
122 <listitem>
123 <para>This tells configure that ${CLFS}/cross-tools/${CLFS_TARGET} is going
124 to be the temporary root of our system. It will now use the specified
125 sysroot as a prefix of the default search paths.</para>
126 </listitem>
127 </varlistentry>
128
129 <varlistentry os="af6">
130 <term><parameter>--disable-nls</parameter></term>
131 <listitem>
132 <para>This disables internationalization as i18n is not needed for the
133 cross-compile tools.</para>
134 </listitem>
135 </varlistentry>
136
137 <varlistentry os="af7">
138 <term><parameter>--disable-shared</parameter></term>
139 <listitem>
140 <para>Disables the creation of the shared libraries.</para>
141 </listitem>
142 </varlistentry>
143
144 <varlistentry os="af11">
145 <term><parameter>--without-headers</parameter></term>
146 <listitem>
147 <para>Tells configure to not use any headers from any C libraries.
148 This is needed as we haven't yet built the C library and to prevent
149 influence from the host environment.</para>
150 </listitem>
151 </varlistentry>
152
153 <varlistentry os="af12">
154 <term><parameter>--with-newlib</parameter></term>
155 <listitem>
156 <para>Tells configure to build libgcc without needing any C
157 libraries.</para>
158 </listitem>
159 </varlistentry>
160
161 <varlistentry os="af13">
162 <term><parameter>--disable-decimal-float</parameter></term>
163 <listitem>
164 <para>Tells configure to disable IEEE 754-2008 decimal floating
165 point support. Decimal floating point support isn't needed yet.</para>
166 </listitem>
167 </varlistentry>
168
169 <varlistentry os="af14">
170 <term><parameter>--disable-libgomp</parameter></term>
171 <listitem>
172 <para>Tells configure to not build the GOMP run-time libraries.
173 GOMP is the GNU implementation of OpenMP, a API for shared-memory
174 parallel programming.</para>
175 </listitem>
176 </varlistentry>
177
178 <varlistentry os="af15">
179 <term><parameter>--disable-libmudflap</parameter></term>
180 <listitem>
181 <para>Tells configure to not build libmudflap. Mudflap is a
182 library that can be used to help check for proper pointer usage.</para>
183 </listitem>
184 </varlistentry>
185
186 <varlistentry os="af16">
187 <term><parameter>--disable-libssp</parameter></term>
188 <listitem>
189 <para>Tells configure not to build run-time libraries for stack
190 smashing detection.</para>
191 </listitem>
192 </varlistentry>
193
194 <varlistentry os="af17">
195 <term><parameter>--disable-libatomic</parameter></term>
196 <listitem>
197 <para>Tells configure not to build atomic operations.</para>
198 </listitem>
199 </varlistentry>
200
201 <varlistentry os="af18">
202 <term><parameter>--disable-libquadmath</parameter></term>
203 <listitem>
204 <para>Tells configure not to build quad math operations.</para>
205 </listitem>
206 </varlistentry>
207
208 <varlistentry os="af19">
209 <term><parameter>--disable-threads</parameter></term>
210 <listitem>
211 <para>This will prevent GCC from looking for the multi-thread
212 include files, since they haven't been created for this architecture
213 yet. GCC will be able to find the multi-thread information after
214 the glib headers are created.</para>
215 </listitem>
216 </varlistentry>
217
218 <varlistentry os="af20">
219 <term><parameter>--enable-languages=c</parameter></term>
220 <listitem>
221 <para>This option ensures that only the C compiler is built.</para>
222 </listitem>
223 </varlistentry>
224
225 <varlistentry os="af21">
226 <term><parameter>--disable-multilib</parameter></term>
227 <listitem>
228 <para>This option specifies that multiple target libraries should
229 not be built.</para>
230 </listitem>
231 </varlistentry>
232
233 <varlistentry os="af22">
234 <term><parameter>--with-mpfr-include=$(pwd)/../gcc-&gcc-version;/mpfr/src</parameter></term>
235 <listitem>
236 <para>Tells configure how to find the mpfr headers.</para>
237 </listitem>
238 </varlistentry>
239
240 <varlistentry os="af23">
241 <term><parameter>--with-mpfr-lib=$(pwd)/mpfr/src/.libs</parameter></term>
242 <listitem>
243 <para>Tells configure to use the mpfr libraries built within the GCC
244 build directory. This happens automatically but is needed to
245 prevent GCC from searching the host's normal library paths.</para>
246 </listitem>
247 </varlistentry>
248
249 </variablelist>
250
251 <para os="ah">Continue with compiling the package:</para>
252
253<screen os="ai"><userinput>make all-gcc all-target-libgcc</userinput></screen>
254
255 <para os="aj">Install the package:</para>
256
257<screen os="ak"><userinput>make install-gcc install-target-libgcc</userinput></screen>
258
259 </sect2>
260
261 <sect2 role="content">
262 <title/>
263
264 <para>Details on this package are located in <xref
265 linkend="contents-gcc" role="."/></para>
266
267 </sect2>
268
269</sect1>
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