mirror of https://github.com/tLDP/LDP
69 lines
3.2 KiB
XML
69 lines
3.2 KiB
XML
<sect2>
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<title>Command explanations</title>
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<para><userinput>mknod -m 0666 /dev/null c 1 3:</userinput> Glibc needs a
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null device to compile properly. All other devices will be created in the
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next section.</para>
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<para><userinput>touch /etc/ld.so.conf</userinput> One of the final steps
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of the Glibc installation is running ldconfig to update the dynamic loader
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cache. If this file doesn't exist, the installation will abort with an error
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that it can't read the file, so we simply create an empty file (the empty file
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will have Glibc default to using /lib and /usr/lib which is fine).</para>
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<para><userinput>sed 's%\$(PERL)%/usr/bin/perl%'
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malloc/Makefile > tmp~:</userinput> This sed command
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searches through <filename>malloc/Makefile</filename> and
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converts all occurrences of <filename>$(PERL)</filename> to
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<filename>/usr/bin/perl</filename>. The output is then written to the
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file <filename>tmp~</filename>. This is done because Glibc can't
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autodetect perl since it hasn't been installed yet.</para>
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<para><userinput>mv tmp~ malloc/Makefile:</userinput> The file
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<filename>tmp~</filename> is now moved back to
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<filename>malloc/Makefile</filename>. We do this because
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when using sed, we can't write straight back to this file so we need to
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use a temporary file in between.</para>
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<para><userinput>sed 's/root/0' login/Makefile >
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tmp~:</userinput> This sed command replaces all occurences of
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<filename>root</filename> in
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<filename>login/Makefile</filename> with 0. This is
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because as we don't have glibc on the LFS system yet, usernames can't
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be resolved to their user id's. Therefore, we replace the username
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root with the id 0. </para>
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<para><userinput>mv tmp~ login/Makefile:</userinput> As above, we are using
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a temporary file (<filename>tmp~</filename>) to store the
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edited Makefile and then copying it back over the original.</para>
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<para><userinput>--enable-add-ons:</userinput> This enables the add-on that
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we install with Glibc: linuxthreads</para>
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<para><userinput>--libexecdir=/usr/bin:</userinput> This will cause the
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pt_chown program to be installed in the /usr/bin directory.</para>
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<para><userinput>sed 's/cross-compiling = yes/cross-compiling = no/'
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config.make > config.make~:</userinput> This time, we're replacing
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<filename>cross-compiling = yes</filename> with
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<filename>cross-compiling = no</filename>. We do this because we are
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only building for our own system. Cross-compiling is used, for
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instance, to build a package for an Apple Power PC on an Intel system.
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The reason Glibc thinks we're cross-compiling is that it can't compile a
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test program to determine this, so it automatically defaults to a
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cross-compiler. The reason for the failed program is because Glibc
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hasn't been installed yet.</para>
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<para><userinput>mv config.make~ config.make:</userinput> Again, we are moving
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the temporary file over the original.</para>
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<para><userinput>exec /bin/bash:</userinput>This command will
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start a new bash shell which will replace the current shell. This is
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done to get rid of the "I have no name!" message in the command
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prompt, which was caused by bash's inability to resolve a userid to
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a username (which in turn was caused by the missing Glibc
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installation).</para>
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</sect2>
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