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authorBruce Dubbs <bdubbs@linuxfromscratch.org>2016-08-12 17:41:46 +0000
committerBruce Dubbs <bdubbs@linuxfromscratch.org>2016-08-12 17:41:46 +0000
commitc4e459bfb74bd5d2b010ccef9ed292ac9cbca0e9 (patch)
treea1d22fbd3eb2908412075a6137162dca50702615 /chapter05/adjusting.xml
parenta840e5905d8d2906120b5a8a9d6a06c987727d98 (diff)
Update to diffutils-3.4.
Update to iproute2-4.7.0. Update to util-linux 2.28.1. git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11107 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
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-<?xml version="1.0" encoding="ISO-8859-1"?>
-<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
- "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
- <!ENTITY % general-entities SYSTEM "../general.ent">
- %general-entities;
-]>
-
-<sect1 id="ch-tools-adjusting">
- <?dbhtml filename="adjusting.html"?>
-
- <title>Adjusting the Toolchain</title>
-
- <para>Now that the temporary C libraries have been installed, all
- tools compiled in the rest of this chapter should be linked against
- these libraries. In order to accomplish this, the cross-compiler's
- specs file needs to be adjusted to point to the new dynamic linker
- in <filename class="directory">/tools</filename>.</para>
-
- <para>This is done by dumping the compiler's <quote>specs</quote> file to a
- location where it will look for it by default.
- A simple <command>sed</command> substitution then alters the
- dynamic linker that GCC will use. The principle here is to find all references
- to the dynamic linker file in <filename class="directory">/lib</filename>
- or possibly <filename class="directory">/lib64</filename> if the host system
- is 64-bit capable, and adjust them to point to the new location in
- <filename class="directory">/tools</filename>.</para>
-
- <para>For the sake of accuracy, it is recommended to use a copy-and-paste
- method when issuing the following command. Be sure to visually inspect the
- specs file to verify that it has properly adjusted all references to the
- dynamic linker location. Refer to <xref
- linkend="ch-tools-toolchaintechnotes" role=","/> for the default name
- of the dynamic linker, if necessary.</para>
-
-<!-- Ampersands are needed to allow copy and paste -->
-<screen><userinput>SPECS=`dirname $($LFS_TGT-gcc -print-libgcc-file-name)`/specs
-$LFS_TGT-gcc -dumpspecs | sed \
- -e 's@/lib\(64\)\?/ld@/tools&amp;@g' \
- -e "/^\*cpp:$/{n;s,$, -isystem /tools/include,}" &gt; $SPECS
-echo "New specs file is: $SPECS"
-unset SPECS</userinput></screen>
-
- <caution>
- <para>At this point, it is imperative to stop and ensure that the basic
- functions (compiling and linking) of the new toolchain are working as
- expected. To perform a sanity check, run the following commands:</para>
-
-<screen><userinput>echo 'int main(){}' &gt; dummy.c
-$LFS_TGT-gcc -B/tools/lib dummy.c
-readelf -l a.out | grep ': /tools'</userinput></screen>
-
- <para>If everything is working correctly, there should be no errors,
- and the output of the last command will be of the form:</para>
-
-<screen><computeroutput>[Requesting program interpreter: /tools/lib/ld-linux.so.2]</computeroutput></screen>
-
- <para>Note that <filename class="directory">/tools/lib</filename>, or
- <filename class="directory">/tools/lib64</filename> for 64-bit machines
- appears as the prefix of the dynamic linker.</para>
-
- <para>If the output is not shown as above or there was no output at all,
- then something is wrong. Investigate and retrace the steps to find out
- where the problem is and correct it. This issue must be resolved before
- continuing on. Something may have gone wrong with the
- specs file amendment above. In this case, redo the specs file amendment,
- being careful to copy-and-paste the commands.</para>
-
- <para>Once all is well, clean up the test files:</para>
-
-<screen><userinput>rm -v dummy.c a.out</userinput></screen>
-
- </caution>
-
- <note><para>Building Binutils in the next section will serve as an additional check that
- the toolchain has been built properly. If Binutils fails to build, it is an
- indication that something has gone wrong with the previous Binutils, GCC, or Glibc
- installations.</para></note>
-
-</sect1>