| 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 occurrences 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>echo "cross-compiling = no" > configparms:</userinput>
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| 37 | We do this because we are only building for our own system. Cross-compiling
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| 38 | is used, for instance, to build a package for an Apple Power PC on an
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| 39 | Intel system. The reason Glibc thinks we're cross-compiling is that it
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| 40 | can't compile a test program to determine this, so it automatically defaults
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| 41 | to a cross-compiler. Compiling the test program fails because Glibc hasn't
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| 42 | been installed yet.</para>
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| 43 |
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| 44 | <para><userinput>exec /bin/bash:</userinput>This command will
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| 45 | start a new bash shell which will replace the current shell. This is
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| 46 | done to get rid of the "I have no name!" message in the command
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| 47 | prompt, which was caused by bash's inability to resolve a userid to
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| 48 | a username (which in turn was caused by the missing Glibc
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| 49 | installation).</para>
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| 50 |
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| 51 | </sect2>
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| 52 |
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