| 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-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">/tools/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>.</para>
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| 22 |
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| 23 | <para>You can now remove the Binutils source and build directories.</para>
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| 24 |
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| 25 | <para>The next thing to do is to amend our GCC specs file so that it points
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| 26 | to the new dynamic linker. Just like earlier on, we use a sed to accomplish
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| 27 | this:</para>
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| 28 |
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| 29 | <para><screen><userinput>SPECFILE=/tools/lib/gcc-lib/*/*/specs
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| 30 | sed -e 's@/tools/lib/ld.so.1@/lib/ld.so.1@g' \
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| 31 | -e 's@/tools/lib/ld-linux.so.2@/lib/ld-linux.so.2@g' \
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| 32 | $SPECFILE > newspecfile
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| 33 | mv newspecfile $SPECFILE
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| 34 | unset SPECFILE</userinput></screen></para>
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| 35 |
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| 36 | <para>Again, cutting and pasting the above is recommended. And just like
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| 37 | before, it is a good idea to check the linker scripts and the specs file to
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| 38 | ensure the intended changes were actually made.</para>
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| 39 |
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| 40 | <para>Note that the linker scripts will still contain a reference to
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| 41 | <filename class="directory">/tools/i686-pc-linux-gnu/lib</filename>. This
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| 42 | is unavoidable, but luckily does not present a problem. There are no
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| 43 | libraries in that location as all the temporary tools libraries are
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| 44 | located in <filename class="directory">/tools/lib</filename>.</para>
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| 45 |
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| 46 | </sect1>
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| 47 |
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