source: BOOK/cross-tools/common/gcc-static.xml@ 1aff88f

clfs-3.0.0-systemd systemd
Last change on this file since 1aff88f was 81e2591, checked in by Chris Staub <chris@…>, 10 years ago

Minor command explanation correction
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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-cross-tools-gcc-static" role="wrap">
9 <?dbhtml filename="gcc-static.html"?>
10
11 <title>Cross GCC-&gcc-version; - Static</title>
12
13 <indexterm zone="ch-cross-tools-gcc-static">
14 <primary sortas="a-GCC">GCC</primary>
15 <secondary>cross tools, static</secondary>
16 </indexterm>
17
18 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
19 href="../../final-system/common/gcc.xml"
20 xpointer="xpointer(//*[@role='package'])"/>
21
22 <sect2 role="installation">
23 <title>Installation of Cross GCC Compiler with Static libgcc
24 and no Threads</title>
25
26 <para os="e">Here we will compile GCC, as a cross-compiler that will create
27 executables for our target architecture, statically so that it will not
28 need to look for Glibc's startfiles, which do not yet exist in
29 <filename class="directory">/tools</filename>. We will use this
30 cross-compiler, plus the cross-linker we have just installed with Binutils,
31 to compile Glibc. After Glibc is installed into
32 <filename class="directory">/tools</filename>, we can rebuild GCC
33 so that it will then be able to build executables that link against the
34 libraries in <filename class="directory">/tools</filename>.</para>
35
36 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
37 href="../../final-system/common/gcc.xml"
38 xpointer="xpointer(//*[@os='p1'])"/>
39
40 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
41 href="../../final-system/common/gcc.xml"
42 xpointer="xpointer(//*[@os='p2'])"/>
43
44 <para os="aa">Make a couple of essential adjustments to GCC's specs
45 to ensure GCC uses our build environment:</para>
46
47<screen os="ab"><userinput>patch -Np1 -i ../&gcc-specs-patch;</userinput></screen>
48
49 <para os="ag">Change the StartFile Spec so that GCC looks in
50<filename class="directory">/tools</filename>:</para>
51
52<screen os="ah"><userinput>echo -en '\n#undef STANDARD_STARTFILE_PREFIX_1\n#define STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"\n' &gt;&gt; gcc/config/linux.h
53echo -en '\n#undef STANDARD_STARTFILE_PREFIX_2\n#define STANDARD_STARTFILE_PREFIX_2 ""\n' &gt;&gt; gcc/config/linux.h</userinput></screen>
54
55 <para os="t1">We will create a dummy <filename>limits.h</filename> so
56 the build will not use the one provided by the host distro:</para>
57
58<screen os="t2"><userinput>touch /tools/include/limits.h</userinput></screen>
59
60 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
61 href="../../final-system/common/gcc.xml"
62 xpointer="xpointer(//*[@os='f'])"/>
63
64 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
65 href="../../final-system/common/gcc.xml"
66 xpointer="xpointer(//*[@os='g'])"/>
67
68 <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
69 href="../../final-system/common/gcc.xml"
70 xpointer="xpointer(//*[@os='h'])"/>
71
72<screen os="al"><userinput>AR=ar LDFLAGS="-Wl,-rpath,/cross-tools/lib" \
73 ../gcc-&gcc-version;/configure --prefix=/cross-tools \
74 --build=${CLFS_HOST} --host=${CLFS_HOST} --target=${CLFS_TARGET} \
75 --with-sysroot=${CLFS} --with-local-prefix=/tools \
76 --with-native-system-header-dir=/tools/include --disable-nls \
77 --disable-shared --with-mpfr=/cross-tools --with-gmp=/cross-tools \
78 --with-isl=/cross-tools --with-cloog=/cross-tools --with-mpc=/cross-tools \
79 --without-headers --with-newlib --disable-decimal-float --disable-libgomp \
80 --disable-libmudflap --disable-libssp --disable-libatomic --disable-libitm \
81 --disable-libsanitizer --disable-libquadmath --disable-threads \
82 --disable-multilib --disable-target-zlib --with-system-zlib \
83 --enable-languages=c --enable-checking=release</userinput></screen>
84
85 <variablelist os="am">
86 <title>The meaning of the new configure options:</title>
87
88 <varlistentry>
89 <term><parameter>--build=${CLFS_HOST}</parameter></term>
90 <listitem>
91 <para>This specifies the system on which the cross-compiler is being
92 built.</para>
93 </listitem>
94 </varlistentry>
95
96 <varlistentry>
97 <term><parameter>--with-local-prefix=/tools</parameter></term>
98 <listitem>
99 <para>The purpose of this switch is to remove <filename
100 class="directory">/usr/local/include</filename> from
101 <command>gcc</command>'s include search path. This is not
102 absolutely essential, however, it helps to minimize the
103 influence of the host system.</para>
104 </listitem>
105 </varlistentry>
106
107 <varlistentry>
108 <term><parameter>--with-native-system-headers-dir=/tools/include</parameter></term>
109 <listitem>
110 <para>This switch ensures that GCC will search for the system headers
111 in <filename class="directory">/tools/include</filename> and that
112 host system headers will not be searched.</para>
113 </listitem>
114 </varlistentry>
115
116 <varlistentry>
117 <term><parameter>--disable-shared</parameter></term>
118 <listitem>
119 <para>This tells GCC not to create a shared library.</para>
120 </listitem>
121 </varlistentry>
122
123 <varlistentry>
124 <term><parameter>--without-headers</parameter></term>
125 <listitem>
126 <para>Disables GCC from using the target's Libc when cross compiling.</para>
127 </listitem>
128 </varlistentry>
129
130 <varlistentry>
131 <term><parameter>--with-newlib</parameter></term>
132 <listitem>
133 <para>This causes GCC to enable the <envar>inhibit_libc</envar> flag,
134 which prevents <filename class="libraryfile">libgcc</filename>
135 from building code that uses libc support.</para>
136 </listitem>
137 </varlistentry>
138
139 <varlistentry>
140 <term><parameter>--disable-decimal-float</parameter></term>
141 <listitem>
142 <para>Disables support for the C decimal floating point extension.</para>
143 </listitem>
144 </varlistentry>
145
146 <varlistentry>
147 <term><parameter>--disable-lib*</parameter></term>
148 <listitem>
149 <para>These options prevent GCC from building a number of libraries
150 that are not needed at this time.</para>
151 </listitem>
152 </varlistentry>
153
154 <varlistentry>
155 <term><parameter>--disable-threads</parameter></term>
156 <listitem>
157 <para>This will prevent GCC from looking for the multi-thread
158 include files, since they haven't been created for this architecture
159 yet. GCC will be able to find the multi-thread information after
160 the Glibc headers are created.</para>
161 </listitem>
162 </varlistentry>
163
164 <varlistentry>
165 <term><parameter>--disable-target-zlib</parameter></term>
166 <listitem>
167 <para>This tells GCC not to build the copy of Zlib in its
168 source tree.</para>
169 </listitem>
170 </varlistentry>
171
172 <varlistentry>
173 <term><parameter>--with-system-zlib</parameter></term>
174 <listitem>
175 <para>This tells GCC to link to the system-installed zlib instead
176 of the one in its source tree.</para>
177 </listitem>
178 </varlistentry>
179
180 <varlistentry>
181 <term><parameter>--enable-languages=c</parameter></term>
182 <listitem>
183 <para>This option ensures that only the C compiler is built.</para>
184 </listitem>
185 </varlistentry>
186
187 <varlistentry>
188 <term><parameter>--enable-checking=release</parameter></term>
189 <listitem>
190 <para>This option selects the complexity of the internal consistency checks and adds error checking within the compiler.</para>
191 </listitem>
192 </varlistentry>
193
194 </variablelist>
195
196 <para os="an">Continue with compiling the package:</para>
197
198<screen os="ao"><userinput>make all-gcc all-target-libgcc</userinput></screen>
199
200 <variablelist os="ap">
201 <title>The meaning of the new make options:</title>
202
203 <varlistentry>
204 <term><parameter>all-gcc all-target-libgcc</parameter></term>
205 <listitem>
206 <para>Compiles only the parts of GCC that are needed at this time,
207 rather than the full package.</para>
208 </listitem>
209 </varlistentry>
210
211 </variablelist>
212
213 <para os="aq">Install the package:</para>
214
215<screen os="ar"><userinput>make install-gcc install-target-libgcc</userinput></screen>
216
217 </sect2>
218
219 <sect2 role="content">
220 <title/>
221
222 <para>Details on this package are located in <xref
223 linkend="contents-gcc" role="."/></para>
224
225 </sect2>
226
227</sect1>
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