1 | <sect1 id="ch06-adjustingtoolchain">
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2 | <title>Re-adjusting the toolchain</title>
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3 | <?dbhtml filename="adjustingtoolchain.html" dir="chapter06"?>
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4 |
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5 | <para>Now that the new C libraries have been installed, it's time to re-adjust
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6 | our toolchain. We'll adjust it so that it will link any newly compiled program
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7 | against the new C libraries. Basically, this is the reverse of what we did
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8 | in the "Locking in" stage in the beginning of the previous chapter.</para>
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9 |
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10 | <para>The first thing to do is to adjust the linker scripts. For this we
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11 | retained the source and build directories from the second pass over Binutils.
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12 | Install the adjusted linker scripts by running the following from within the
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13 | <filename class="directory">binutils-build</filename> directory:</para>
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14 |
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15 | <para><screen><userinput>make -C ld INSTALL=/stage1/bin/install install-data-local</userinput></screen></para>
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16 |
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17 | <para>The linker scripts now contain
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18 | no mention of <filename class="directory">/stage1/lib</filename> anymore.
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19 | From now on every compiled program will link <emphasis>only</emphasis>
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20 | against the libraries in <filename>/usr/lib</filename> and
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21 | <filename>/lib</filename>. The extra
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22 | <userinput>INSTALL=/stage1/bin/install</userinput> is needed because the
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23 | Makefile created during the second pass still contains the reference to
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24 | <filename>/usr/bin/install</filename>, which we obviously haven't installed
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25 | yet.</para>
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26 |
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27 | <para>You can now remove the Binutils source and build directories.</para>
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28 |
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29 | <para>The next thing to do is to amend our GCC specs file so that it points
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30 | to the new dynamic linker. Just like earlier on, we use a sed to accomplish
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31 | this:</para>
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32 |
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33 | <para><screen><userinput>SPECFILE=/stage1/lib/gcc-lib/*/*/specs
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34 | sed -e 's@/stage1/lib/ld.so.1@/lib/ld.so.1@g' \
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35 | -e 's@/stage1/lib/ld-linux.so.2@/lib/ld-linux.so.2@g'
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36 | $SPECFILE > newspecfile
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37 | mv newspecfile $SPECFILE
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38 | unset SPECFILE</userinput></screen></para>
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39 |
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40 | <para>Again, cutting and pasting the above is recommended. And just like
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41 | before, it is a good idea to check the linker scripts and the specs file to
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42 | ensure the intended changes were actually made.</para>
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43 |
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44 | <para>Note that the linker scripts will still contain a reference to
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45 | <filename class="directory">/stage1/i686-pc-linux-gnu/lib</filename>. This
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46 | is unavoidable, but luckily does not present a problem. There are no
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47 | libraries in that location as all the temporary stage1 libraries are
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48 | located in <filename class="directory">/stage1/lib</filename>.</para>
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49 |
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50 | </sect1>
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51 |
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