1 | <sect2>
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2 | <title>Command explanations</title>
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3 |
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4 | <para><userinput>mknod -m 0666 /dev/null c 1 3:</userinput> Glibc needs a
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5 | null device to compile properly. All other devices will be created in the
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6 | next section.</para>
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7 |
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8 | <para><userinput>touch /etc/ld.so.conf</userinput> One of the final steps
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9 | of the Glibc installation is running ldconfig to update the dynamic loader
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10 | cache. If this file doesn't exist, the installation will abort with an error
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11 | that it can't read the file, so we simply create an empty file (the empty file
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12 | will have Glibc default to using /lib and /usr/lib which is fine).</para>
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13 |
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14 | <para><userinput>sed 's%\$(PERL)%/usr/bin/perl%'
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15 | malloc/Makefile.backup > malloc/Makefile:</userinput> This sed command
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16 | searches through <filename>malloc/Makefile.backup</filename> and
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17 | converts all occurrences of <filename>$(PERL)</filename> to
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18 | <filename>/usr/bin/perl</filename>. The output is then written to the
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19 | original <filename>malloc/Makefile.in</filename> which is used during
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20 | configuration. This is done because Glibc can't autodetect perl since
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21 | it hasn't been installed yet.</para>
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22 |
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23 | <para><userinput>sed 's/root/0' login/Makefile.backup >
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24 | login/Makefile:</userinput> This sed command replaces all occurences of
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25 | <filename>root</filename> in <filename>login/Makefile.backup</filename>
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26 | with 0. This is because we don't have glibc on the LFS system yet, so
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27 | usernames can't be resolved to their user id's. Therefore, we replace
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28 | the username root with user id 0.</para>
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29 |
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30 | <para><userinput>--enable-add-ons:</userinput> This enables the add-on that
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31 | we install with Glibc: linuxthreads</para>
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32 |
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33 | <para><userinput>--libexecdir=/usr/bin:</userinput> This will cause the
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34 | pt_chown program to be installed in the /usr/bin directory.</para>
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35 |
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36 | <para><userinput>sed 's/cross-compiling = yes/cross-compiling = no/'
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37 | config.make.backup > config.make:</userinput> This time, sed searches
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38 | through <filename>config.make.backup</filename> and replaces all occurences
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39 | of <filename>cross-compiling = yes</filename> with
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40 | <filename>cross-compiling = no</filename>. We do this because we are
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41 | only building for our own system. Cross-compiling is used, for instance,
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42 | to build a package for an Apple Power PC on an Intel system. The reason
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43 | Glibc thinks we're cross-compiling is that it can't compile a test program
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44 | to determine this, so it automatically defaults to a cross-compiler.
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45 | Compiling the test program failes because Glibc hasn't been installed
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46 | yet.</para>
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47 |
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48 | <para><userinput>exec /bin/bash:</userinput>This command will
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49 | start a new bash shell which will replace the current shell. This is
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50 | done to get rid of the "I have no name!" message in the command
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51 | prompt, which was caused by bash's inability to resolve a userid to
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52 | a username (which in turn was caused by the missing Glibc
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53 | installation).</para>
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54 |
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55 | </sect2>
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56 |
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