source: chapter06/gcc-inst.xml@ 791dec6

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Last change on this file since 791dec6 was a3f6e124, checked in by Greg Schafer <greg@…>, 21 years ago

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1<sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>
2
3<sect2>
4<title>Installation of GCC</title>
5
6<note><para>The test suite for GCC in this section is considered
7<emphasis>critical</emphasis>. Our advice is to not skip it under any
8circumstance.</para></note>
9
10<para>This package is known to behave badly when you have changed its
11default optimization flags (including the -march and -mcpu options).
12Therefore, if you have defined any environment variables that override
13default optimizations, such as CFLAGS and CXXFLAGS, we recommend unsetting
14or modifying them when building GCC.</para>
15
16<para>This time we will build both the C and the C++ compiler, so you'll have
17to unpack the GCC-core <emphasis>and</emphasis> the GCC-g++ tarball -- they
18will unfold into the same directory. You should likewise extract the
19GCC-testsuite package. The full GCC package contains even more
20compilers. Instructions for building these can be found at
21<ulink url="&blfs-root;view/stable/general/gcc.html"/>.</para>
22
23<screen><userinput>patch -Np1 -i ../&gcc-nofixincludes-patch;
24patch -Np1 -i ../&gcc-suppress-libiberty-patch;</userinput></screen>
25
26<para>The second patch here suppresses the installation of libiberty from GCC,
27as we will use the one provided by binutils instead. Be careful
28<emphasis>not</emphasis> to apply the GCC specs patch from Chapter 5
29here.</para>
30
31<para>The GCC documentation recommends building GCC outside of the source
32directory in a dedicated build directory:</para>
33
34<screen><userinput>mkdir ../gcc-build
35cd ../gcc-build</userinput></screen>
36
37<para>Now prepare GCC for compilation:</para>
38
39<screen><userinput>../gcc-&gcc-version;/configure --prefix=/usr \
40&nbsp;&nbsp;&nbsp;&nbsp;--enable-shared --enable-threads=posix \
41&nbsp;&nbsp;&nbsp;&nbsp;--enable-__cxa_atexit --enable-clocale=gnu \
42&nbsp;&nbsp;&nbsp;&nbsp;--enable-languages=c,c++</userinput></screen>
43
44<para>Compile the package:</para>
45
46<screen><userinput>make</userinput></screen>
47
48<para>Test the results, but don't stop at errors (you'll remember the few
49known ones):</para>
50
51<screen><userinput>make -k check</userinput></screen>
52
53<para>The test suite notes from <xref linkend="ch05-gcc-pass2"/> are still very
54much appropriate here. Be sure to refer back there should you have any
55doubts.</para>
56
57<para>And install the package:</para>
58
59<screen><userinput>make install</userinput></screen>
60
61<para>Some packages expect the C PreProcessor to be installed in the
62<filename>/lib</filename> directory.
63To honor those packages, create this symlink:</para>
64
65<screen><userinput>ln -s ../usr/bin/cpp /lib</userinput></screen>
66
67<para>Many packages use the name <userinput>cc</userinput> to call the C
68compiler. To satisfy those packages, create a symlink:</para>
69
70<screen><userinput>ln -s gcc /usr/bin/cc</userinput></screen>
71
72<note><para>At this point it is strongly recommended to repeat the sanity check
73we performed earlier in this chapter. Refer back to
74<xref linkend="ch06-adjustingtoolchain"/> and repeat the check. If the results
75are wrong, then most likely you erroneously applied the GCC Specs patch from
76Chapter 5.</para></note>
77
78</sect2>
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