source: BOOK/final-system/x86/adjusting.xml @ 6aad380

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since 6aad380 was 3f8be484, checked in by Jim Gifford <clfs@…>, 18 years ago

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

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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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