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57 lines
2.7 KiB
XML
57 lines
2.7 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.backup > malloc/Makefile:</userinput> This sed command
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searches through <filename>malloc/Makefile.backup</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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original <filename>malloc/Makefile.in</filename> which is used during
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configuration. This is done because Glibc can't autodetect perl since
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it hasn't been installed yet.</para>
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<para><userinput>sed 's/root/0' login/Makefile.backup >
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login/Makefile:</userinput> This sed command replaces all occurences of
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<filename>root</filename> in <filename>login/Makefile.backup</filename>
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with 0. This is because we don't have glibc on the LFS system yet, so
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usernames can't be resolved to their user id's. Therefore, we replace
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the username root with user id 0.</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.backup > config.make:</userinput> This time, sed searches
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through <filename>config.make.backup</filename> and replaces all occurences
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of <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 instance,
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to build a package for an Apple Power PC on an Intel system. The reason
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Glibc thinks we're cross-compiling is that it can't compile a test program
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to determine this, so it automatically defaults to a cross-compiler.
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Compiling the test program failes because Glibc hasn't been installed
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yet.</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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