| 1 | <sect1 id="ch05-locking-glibc">
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| 2 | <title>"Locking in" Glibc</title>
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| 3 | <?dbhtml filename="lockingglibc.html" dir="chapter05"?>
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| 4 |
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| 5 | <para>Now that the temporary C libraries have been installed, we want all
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| 6 | the tools compiled in the rest of this chapter to be linked against these
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| 7 | libraries. To accomplish this, we need to adjust the linker's scripts and the
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| 8 | compiler's specs file.</para>
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| 9 |
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| 10 | <para>First install the adjusted linker scripts by running the following from
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| 11 | within the <filename class="directory">binutils-build</filename>
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| 12 | directory:</para>
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| 13 |
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| 14 | <para><screen><userinput>make -C ld install-data-local</userinput></screen></para>
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| 15 |
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| 16 | <para>These scripts were adjusted a little while back, at the end of the first
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| 17 | pass of Binutils, and contain no mention of <filename>/lib</filename>,
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| 18 | <filename>/usr/lib</filename> or <filename>/usr/local/lib</filename>.
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| 19 | From this point onwards everything will link <emphasis>only</emphasis>
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| 20 | against the libraries in <filename>/tools/lib</filename>.</para>
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| 21 |
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| 22 | <para>You can now remove Binutils' build and source directories.</para>
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| 23 |
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| 24 | <para>The other thing to do is to amend our GCC specs file so that it points
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| 25 | to the new dynamic linker. A simple sed will accomplish this:</para>
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| 26 |
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| 27 | <para><screen><userinput>SPECFILE=/tools/lib/gcc-lib/*/*/specs
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| 28 | sed -e 's@/lib/ld.so.1@/tools/lib/ld.so.1@g' \
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| 29 | -e 's@/lib/ld-linux.so.2@/tools/lib/ld-linux.so.2@g' \
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| 30 | $SPECFILE > tempspecfile
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| 31 | mv tempspecfile $SPECFILE
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| 32 | unset SPECFILE</userinput></screen></para>
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| 33 |
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| 34 | <para>We recommend that you cut-and-paste the above rather than try and type
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| 35 | it all in. Or you can edit the specs file by hand if you want to: just replace
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| 36 | "/lib/ld-linux.so.2" with "/tools/lib/ld-linux.so.2".</para>
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| 37 |
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| 38 | <para>Lastly, there is a possibility that some include files from the host
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| 39 | system have found their way into gcc's private include dir. This can happen
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| 40 | because of GCC's "fixincludes" process which part of the GCC build. We'll
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| 41 | explain more about this further on in this chapter. For now, run the
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| 42 | following commands to eliminate this possibility.</para>
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| 43 |
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| 44 | <para><screen><userinput>rm -f /tools/lib/gcc-lib/*/*/include/{pthread.h,bits/sigthread.h}</userinput></screen></para>
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| 45 |
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| 46 | <para>This completes the installation of the self-contained toolchain, which
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| 47 | can now be used to build the rest of the temporary tools.</para>
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| 48 |
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| 49 | </sect1>
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| 50 |
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