| 1 | <sect1 id="ch05-settingenviron">
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| 2 | <title>Setting up the environment</title>
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| 3 | <?dbhtml filename="settingenviron.html" dir="chapter05"?>
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| 4 |
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| 5 | <para>While logged in as user <emphasis>lfs</emphasis>, issue the
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| 6 | following commands to set up a good work environment:</para>
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| 7 |
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| 8 | <para><screen><userinput>cat > ~/.bash_profile << "EOF"
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| 9 | set +h
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| 10 | umask 022
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| 11 | LFS=/mnt/lfs
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| 12 | LC_ALL=POSIX
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| 13 | LDFLAGS="-s"
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| 14 | PATH=/stage1/bin:$PATH
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| 15 | export LFS LC_ALL LDFLAGS PATH
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| 16 | EOF
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| 17 | source ~/.bash_profile</userinput></screen></para>
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| 18 |
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| 19 | <para><userinput>set +h</userinput> turns off Bash's hash function. Hash
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| 20 | normally is a useful feature where Bash uses a hash table to remember the
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| 21 | full pathnames of executable files to avoid multiple `PATH' searches.
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| 22 | However, we'd like the new tools to become available as soon as they are
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| 23 | installed. By switching off the hash function, our "interactive" commands
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| 24 | (make, patch, sed, cp and so forth) will always use the newest available
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| 25 | during the build process.</para>
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| 26 |
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| 27 | <para>This profile sets the umask to 022, so newly created files and
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| 28 | directories will have the correct permissions. To be more specific, only
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| 29 | the file owner will have write permission to new files and directories.
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| 30 | Other users of the system will be have read permission, and executable
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| 31 | permission to directories. It is advisable to keep this setting throughout
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| 32 | your LFS installation.</para>
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| 33 |
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| 34 | <para>The LFS variable should of course be set to the mount point you
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| 35 | chose.</para>
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| 36 |
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| 37 | <para>The LC_ALL variable controls the localization of certain programs,
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| 38 | making their messages follow the conventions of a specified country. If your
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| 39 | host system uses a version of <emphasis>glibc</emphasis> older than 2.2.4,
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| 40 | having LC_ALL set to something other than "C" or "POSIX" during this chapter
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| 41 | may cause trouble if you exit the chroot environment and wish to return later.
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| 42 | By setting LC_ALL to "POSIX" ("C" is an alias for "POSIX") we ensure that
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| 43 | everything will work as expected in the chroot environment.</para>
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| 44 |
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| 45 | <para>LDFLAGS is a variable we set in order to prevent debugging symbols from
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| 46 | being compiled into our static packages. By omitting these symbols during
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| 47 | the linking stage of compilation, we save hard drive space and decrease our
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| 48 | build time.</para>
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| 49 |
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| 50 | <para>We are now prepared to begin building the temporary tools which will
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| 51 | support us in later chapters.</para>
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| 52 |
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| 53 | </sect1>
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| 54 |
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