source: BOOK/final-system/common/adjusting.xml@ 4261659

clfs-1.2 clfs-2.1 clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since 4261659 was 1b274255, checked in by Jim Gifford <clfs@…>, 16 years ago

Changed > to &gt throughout 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 V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/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;' &gt; \
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
35gcc 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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