| 1 | <sect2>
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| 2 | <title>Installation of Glibc</title>
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| 3 |
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| 4 | <para>At the beginning of this chapter you installed Glibc and applied a
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| 5 | patch to it. Part of this patch was undoing some changes to make static
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| 6 | binaries compiled against Glibc-2.2 work. However, this is not what the
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| 7 | Glibc developers intended and we don't need to keep this modified Glibc
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| 8 | around. So we reinstall Glibc here to remove this patch.</para>
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| 9 |
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| 10 | <para>A second reason to install Glibc again is because it's considered
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| 11 | cleaner. The first Glibc was installed using programs compiled on your host
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| 12 | distribution which sometimes has the effect of tainting Glibc. While this
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| 13 | isn't a problem with the other packages compiled early in this chapter, for
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| 14 | Glibc we want to be sure it's 100% OK (although feel free to reinstall
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| 15 | other packages at this point so you can say you compiled an LFS system with
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| 16 | LFS. Much like GCC's bootstrap installation method).</para>
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| 17 |
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| 18 | <para>We'll also install the linuxthreads man pages here. As you may
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| 19 | recall, during the first installation of Glibc this wasn't possible because
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| 20 | Perl wasn't installed yet. Everything we need to install the Glibc
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| 21 | linuxthread man pages is present now, so we'll take care of this too
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| 22 | now.</para>
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| 23 |
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| 24 | <para>Before starting to install glibc, you must cd into the
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| 25 | glibc-&glibc-version; directory and unpack glibc-linuxthreads inside
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| 26 | the glibc-&glibc-version; directory, not in /usr/src as you normally
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| 27 | would do.</para>
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| 28 |
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| 29 | <para>This package is known to behave badly when you have changed its
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| 30 | default optimization flags (including the -march and -mcpu options). Glibc
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| 31 | is best left alone. Therefore, if you have defined any environment variables
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| 32 | that override default optimizations, such as CFLAGS and CXXFLAGS, we
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| 33 | recommend unsetting or modifying them when building Glibc. You have
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| 34 | been warned.</para>
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| 35 |
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| 36 | <para>Basically, compiling Glibc in any other way than the book suggests
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| 37 | is putting your system at very high risk.</para>
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| 38 |
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| 39 | <para>Install Glibc by running the following commands:</para>
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| 40 |
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| 41 | <para><screen><userinput>mkdir ../glibc-build &&
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| 42 | cd ../glibc-build &&
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| 43 | ../glibc-&glibc-version;/configure --prefix=/usr --disable-profile \
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| 44 | --enable-add-ons --libexecdir=/usr/bin &&
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| 45 | make &&
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| 46 | make install &&
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| 47 | make -C ../glibc-&glibc-version;/linuxthreads/man &&
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| 48 | make -C ../glibc-&glibc-version;/linuxthreads/man install &&
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| 49 | exec /bin/bash --login</userinput></screen></para>
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| 50 |
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| 51 | </sect2>
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| 52 |
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