1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>
<sect1 id="ch-tools-gcc-pass2" role="wrap" xreflabel="gcc-pass2">
<?dbhtml filename="gcc-pass2.html"?>
<sect1info condition="script">
<productname>gcc-pass2</productname>
<productnumber>&gcc-version;</productnumber>
<address>&gcc-url;</address>
</sect1info>
<title>GCC-&gcc-version; - Pass 2</title>
<indexterm zone="ch-tools-gcc-pass2">
<primary sortas="a-GCC">GCC</primary>
<secondary>tools, pass 2</secondary>
</indexterm>
<sect2 role="package">
<title/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
href="../chapter08/gcc.xml"
xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&gcc-tmpp2-sbu;</seg>
<seg>&gcc-tmpp2-du;</seg>
</seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of GCC</title>
<para>As in the first build of GCC, the GMP, MPFR, and MPC packages are
required. Unpack the tarballs and move them into the required directory
names:</para>
<screen><userinput remap="pre">tar -xf ../mpfr-&mpfr-version;.tar.xz
mv -v mpfr-&mpfr-version; mpfr
tar -xf ../gmp-&gmp-version;.tar.xz
mv -v gmp-&gmp-version; gmp
tar -xf ../mpc-&mpc-version;.tar.gz
mv -v mpc-&mpc-version; mpc</userinput></screen>
<para>If building on x86_64, change the default directory name for 64-bit
libraries to <quote>lib</quote>:</para>
<screen><userinput remap="pre">case $(uname -m) in
x86_64)
sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64
;;
esac</userinput></screen>
<!--
<para>Fix an issue with GCC-10.1 when building with a cross
compiler:</para>
<screen><userinput remap="pre">patch -Np1 -i ../&gcc-cross-patch;</userinput></screen>
-->
<para>Create a separate build directory again:</para>
<screen><userinput remap="pre">mkdir -v build
cd build</userinput></screen>
<para>Create a symlink that allows libgcc to be built with posix threads
support:</para>
<screen><userinput remap="pre">mkdir -pv $LFS_TGT/libgcc
ln -s ../../../libgcc/gthr-posix.h $LFS_TGT/libgcc/gthr-default.h</userinput></screen>
<para>Before starting to build GCC, remember to unset any environment
variables that override the default optimization flags.</para>
<para>Now prepare GCC for compilation:</para>
<screen><userinput remap="configure">../configure \
--build=$(../config.guess) \
--host=$LFS_TGT \
--prefix=/usr \
CC_FOR_TARGET=$LFS_TGT-gcc \
--with-build-sysroot=$LFS \
--enable-initfini-array \
--disable-nls \
--disable-multilib \
--disable-decimal-float \
--disable-libatomic \
--disable-libgomp \
--disable-libquadmath \
--disable-libssp \
--disable-libvtv \
--disable-libstdcxx \
--enable-languages=c,c++</userinput></screen>
<variablelist>
<title>The meaning of the new configure options:</title><!-- WIP -->
<varlistentry>
<term><parameter>-with-build-sysroot=$LFS</parameter></term>
<listitem>
<para>Normally, using <parameter>--host</parameter> ensures that
a cross-compiler is used for building GCC, and that compiler knows
that it has to look for headers and libraries in <filename
class="directory">$LFS</filename>. But the build system of GCC uses
other tools, which are not aware of this location. This switch is
needed to have them find the needed files in <filename
class="directory">$LFS</filename>, and not on the host.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--enable-initfini-array</parameter></term>
<listitem>
<para>This option is automatically enabled when building a native
compiler with a native compiler on x86. But here, we build with
a cross compiler, so we need to explicitely set this option.</para>
</listitem>
</varlistentry>
</variablelist>
<para>Compile the package:</para>
<screen><userinput remap="make">make</userinput></screen>
<para>Install the package:</para>
<screen><userinput remap="install">make DESTDIR=$LFS install</userinput></screen>
<para>As a finishing touch, create a utility symlink. Many programs and scripts
run <command>cc</command> instead of <command>gcc</command>, which is
used to keep programs generic and therefore usable on all kinds of UNIX
systems where the GNU C compiler is not always installed. Running
<command>cc</command> leaves the system administrator free to decide
which C compiler to install:</para>
<screen><userinput remap="install">ln -sv gcc $LFS/usr/bin/cc</userinput></screen>
</sect2>
<sect2 role="content">
<title/>
<para>Details on this package are located in
<xref linkend="contents-gcc" role="."/></para>
</sect2>
</sect1>
|
