source: final-system/x86/adjusting.xml@ 531b5e5

Last change on this file since 531b5e5 was bf8c11f, checked in by Jim Gifford <clfs@…>, 19 years ago

r627@server (orig r625): jim | 2005-10-31 12:59:34 -0800
Import of Cross-LFS Book

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File size: 2.4 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3 "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-adjusting">
9 <?dbhtml filename="adjusting.html"?>
10
11 <title>Adjusting the Toolchain</title>
12
13 <para os="a">Now we amend the GCC specs file so that it points to the new
14 dynamic linker. A <command>perl</command> command accomplishes this:</para>
15
16 <warning os="b">
17 <para><emphasis>Do not</emphasis> run the following command more than
18 once, it will adversely affect the outcome of software built after
19 this step.</para>
20 </warning>
21
22<screen os="c"><userinput>gcc -dumpspecs | \
23perl -pi -e 's@/tools/lib/ld@/lib/ld@g;' \
24 -e 's@\*startfile_prefix_spec:\n@$_/usr/lib/ @g;' > \
25 `dirname $(gcc --print-libgcc-file-name)`/specs</userinput></screen>
26
27 <para os="d">It is a good idea to visually inspect the specs file to verify the
28 intended change was actually made.</para>
29
30 <para os="e">Note that <filename class="directory">/lib</filename> is now
31 the prefix of our dynamic linker.</para>
32
33 <caution>
34
35 <para os="f">It is imperative at this point to stop and ensure that
36 the basic functions (compiling and linking) of the adjusted toolchain
37 are working as expected. To do this, perform a sanity
38 check:</para>
39
40<screen os="g"><userinput>echo 'main(){}' &gt; dummy.c
41cc dummy.c
42readelf -l a.out | grep ': /lib'</userinput></screen>
43
44 <para os="h">If everything is working correctly, there should be no errors,
45 and the output of the last command will be:</para>
46
47<screen os="i"><computeroutput>[Requesting program interpreter: /lib/ld-linux.so.2]</computeroutput></screen>
48
49 <para os="j">Note that <filename class="directory">/lib</filename> is now
50 the prefix of our dynamic linker.</para>
51
52 <para os="k">If the output does not appear as shown above or is not received
53 at all, then something is seriously wrong. Investigate and retrace the
54 steps to find out where the problem is and correct it. The most likely
55 reason is that something went wrong with the specs file amendment
56 above. Any issues will need to be resolved before continuing on with
57 the process.</para>
58
59 <para os="l">Once everything is working correctly, clean up the test
60 files:</para>
61
62<screen os="m"><userinput>rm dummy.c a.out</userinput></screen>
63
64 </caution>
65
66</sect1>
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