| 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
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| 13 | right now).</para>
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| 14 |
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| 15 | <para><userinput>sed 's%\$(PERL)%/usr/bin/perl%'
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| 16 | malloc/Makefile > tmp~:</userinput> This sed command
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| 17 | searches through <filename>malloc/Makefile</filename> and
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| 18 | converts all occurances of <filename>$(PERL)</filename> to
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| 19 | <filename>/usr/bin/perl</filename>. The output is then written to the
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| 20 | file <filename>tmp~</filename>. This is done because Glibc can't
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| 21 | autodetect perl since it's not installed yet at the time when we install
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| 22 | Glibc.</para>
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| 23 |
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| 24 | <para><userinput>mv -f tmp~ malloc/Makefile:</userinput> The file
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| 25 | <filename>tmp~</filename> is now moved back to
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| 26 | <filename>malloc/Makefile</filename>. We do this because
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| 27 | when using sed, we can't write straight back to this file so we need to
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| 28 | use a temporary file in between.</para>
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| 29 |
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| 30 | <para><userinput>sed 's/root/0' login/Makefile >
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| 31 | tmp~:</userinput> This sed command replaces all occurances of
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| 32 | <filename>root</filename> in
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| 33 | <filename>login/Makefile</filename> with 0. This is
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| 34 | because as we don't have glibc on the LFS system yet, usernames can't
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| 35 | be resolved to their user id's. Therefore, we replace the username
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| 36 | root with the id 0. </para>
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| 37 |
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| 38 | <para><userinput>mv -f tmp~ login/Makefile:</userinput> Asabove, we are using a temporary file (<filename>tmp~</filename>) to store the
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| 39 | edited Makefile and then copying it back over the original.</para>
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| 40 |
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| 41 | <para><userinput>--enable-add-ons:</userinput> This enables the add-on that
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| 42 | we install with Glibc: linuxthreads</para>
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| 43 |
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| 44 | <para><userinput>sed 's/cross-compiling = yes/cross-compiling = no/'
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| 45 | config.make > config.make~:</userinput> This time, we're replacing
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| 46 | <filename>cross-compiling = yes</filename> with
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| 47 | <filename>cross-compiling = no</filename>. We do this because we are
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| 48 | only building for our own system. Cross-compiling is used, for
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| 49 | instance, to build a package for an Apple Power PC on an Intel system.
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| 50 | The reason Glibc thinks we're cross-compiling is that it can't compile a
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| 51 | test program to determine this, so it automatically defaults to a
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| 52 | cross-compiler. The reason for the failed program is because Glibc
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| 53 | hasn't been installed yet.</para>
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| 54 |
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| 55 | <para><userinput>mv -f config.make~ config.make:</userinput> Again, we are moving
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| 56 | the temporary file over the original.</para>
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| 57 |
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| 58 | <para><userinput>exec /bin/bash:</userinput>This command will
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| 59 | start a new bash shell which will replace the current shell. This is
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| 60 | done to get rid of the "I have no name!" message in the command
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| 61 | prompt, which was caused by bash's inability to resolve a userid to
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| 62 | a username (which in turn was caused by the missing Glibc
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| 63 | installation).</para>
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| 64 |
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| 65 | </sect2>
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| 66 |
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