source: BOOK/final-system/common/adjusting.xml @ 29bba60

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since 29bba60 was 94e6142, checked in by Jim Gifford <clfs@…>, 18 years ago

r1167@server (orig r1165): chris | 2006-02-11 08:13:02 -0800
Added -v to commands in the rest of the book

  • Property mode set to 100644
File size: 2.2 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<screen os="c"><userinput>gcc -dumpspecs | \
17perl -p -e 's@/tools/lib/ld@/lib/ld@g;' \
18     -e 's@\*startfile_prefix_spec:\n@$_/usr/lib/ @g;' > \
19     `dirname $(gcc --print-libgcc-file-name)`/specs</userinput></screen>
20
21  <para os="d">It is a good idea to visually inspect the specs file to verify the
22  intended change was actually made.</para>
23
24  <para os="e">Note that <filename class="directory">/lib</filename> is now
25  the prefix of our dynamic linker.</para>
26
27  <caution>
28
29    <para os="f">It is imperative at this point to stop and ensure that
30    the basic functions (compiling and linking) of the adjusted toolchain
31    are working as expected. To do this, perform a sanity
32    check:</para>
33
34<screen os="g"><userinput>echo 'main(){}' &gt; dummy.c
35cc dummy.c
36readelf -l a.out | grep ': /lib'</userinput></screen>
37
38    <para os="h">If everything is working correctly, there should be no errors,
39    and the output of the last command will be:</para>
40
41<screen os="i"><computeroutput>[Requesting program interpreter: /lib/ld-linux.so.2]</computeroutput></screen>
42
43    <para os="j">Note that <filename class="directory">/lib</filename> is now
44    the prefix of our dynamic linker.</para>
45
46    <para os="k">If the output does not appear as shown above or is not received
47    at all, then something is seriously wrong. Investigate and retrace the
48    steps to find out where the problem is and correct it. The most likely
49    reason is that something went wrong with the specs file amendment
50    above. Any issues will need to be resolved before continuing on with
51    the process.</para>
52
53    <para os="l">Once everything is working correctly, clean up the test
54    files:</para>
55
56<screen os="m"><userinput>rm -v dummy.c a.out</userinput></screen>
57
58  </caution>
59
60</sect1>
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