| 1 | <sect2>
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| 2 | <title>Command explanations</title>
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| 3 |
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| 4 | <para><userinput>patch -Np1 -i ../glibc-&glibc-patch-version;.patch:</userinput>
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| 5 | This patch converts all occurrences of <filename>$(PERL)</filename> to
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| 6 | <filename>/usr/bin/perl</filename> in the
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| 7 | <filename>malloc/Makefile</filename> file. This is done because Glibc can't
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| 8 | autodetect the location of perl because perl has yet to be installed. The
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| 9 | patch also replaces all occurrences of <emphasis>root</emphasis> with
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| 10 | <emphasis>0</emphasis> in the <filename>login/Makefile</filename> file.
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| 11 | This is done because Glibc itself isn't installed yet and therefore
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| 12 | username to userid resolving isn't working yet, so a <userinput>chown root
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| 13 | file</userinput> will fail, however it'll work fine if you use the numeric
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| 14 | IDs.</para>
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| 15 |
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| 16 | <para>Lastly, the patch also fixes a problem that causes statically linked
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| 17 | binaries to crash that were linked against Glibc-2.2 libraries. This patch
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| 18 | is only needed temporarily because we have static programs in <filename
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| 19 | class="directory">/static/bin</filename> that might be linked against an
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| 20 | older Glibc version (the one from the host distribution). We will install
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| 21 | Glibc again at the end of this chapter to remove this patch so you'll have
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| 22 | a pristine Glibc as the developers intended it.</para>
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| 23 |
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| 24 | <para><userinput>touch /etc/ld.so.conf:</userinput> One of the final steps
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| 25 | of the Glibc installation is running ldconfig to update the dynamic loader
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| 26 | cache. If this file doesn't exist, the installation will abort with an error
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| 27 | that it can't read the file, so we simply create an empty file (the empty
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| 28 | file will have Glibc default to using /lib and /usr/lib which is fine).</para>
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| 29 |
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| 30 | <para><userinput>--disable-profile:</userinput> This disables the building
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| 31 | of libraries with profiling information. This command may be omitted if
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| 32 | you plan to do profiling.</para>
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| 33 |
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| 34 | <para><userinput>--enable-add-ons:</userinput> This enables the add-on that
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| 35 | we install with Glibc, linuxthreads</para>
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| 36 |
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| 37 | <para><userinput>--libexecdir=/usr/bin:</userinput> This will cause the
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| 38 | pt_chown program to be installed in the /usr/bin directory.</para>
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| 39 |
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| 40 | <para><userinput>echo "cross-compiling = no" > configparms:</userinput>
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| 41 | We do this because we are only building for our own system. Cross-compiling
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| 42 | is used, for instance, to build a package for an Apple Power PC on an
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| 43 | Intel system. The reason Glibc thinks we're cross-compiling is that it
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| 44 | can't compile a test program to determine this, so it automatically defaults
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| 45 | to a cross-compiler. Compiling the test program fails because Glibc hasn't
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| 46 | been installed yet.</para>
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| 47 |
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| 48 | <para><userinput>exec /static/bin/bash --login:</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 user ID to
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| 52 | a user name (which in turn was caused by the absence of Glibc).</para>
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| 53 |
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| 54 | </sect2>
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| 55 |
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