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Linux From Scratch - Version 7.0

5.34. Stripping

The steps in this section are optional, but if the LFS partition is rather small, it is beneficial to learn that unnecessary

items can be removed. The executables and libraries built so far contain about 70 MB of unneeded debugging symbols.

Remove those symbols with:

strip --strip-debug /tools/lib/*

strip --strip-unneeded /tools/{,s}bin/*

These commands will skip a number of files, reporting that it does not recognize their file format. Most of these are

scripts instead of binaries.

Take care not to use --strip-unneeded on the libraries. The static ones would be destroyed and the toolchain

packages would need to be built all over again.

To save more, remove the documentation:

rm -rf /tools/{,share}/{info,man,doc}

At this point, you should have at least 850 MB of free space in $LFS that can be used to build and install Glibc in

the next phase. If you can build and install Glibc, you can build and install the rest too.

5.35. Changing Ownership

Note

The commands in the remainder of this book must be performed while logged in as user root and no

longer as user lfs. Also, double check that $LFS is set in root's environment.

Currently, the $LFS/tools directory is owned by the user lfs, a user that exists only on the host system. If

the $LFS/tools directory is kept as is, the files are owned by a user ID without a corresponding account. This

is dangerous because a user account created later could get this same user ID and would own the $LFS/tools

directory and all the files therein, thus exposing these files to possible malicious manipulation.

To avoid this issue, you could add the lfs user to the new LFS system later when creating the /etc/passwd file,

taking care to assign it the same user and group IDs as on the host system. Better yet, change the ownership of the

$LFS/tools directory to user root by running the following command:

chown -R root:root $LFS/tools

Although the $LFS/tools directory can be deleted once the LFS system has been finished, it can be retained to

build additional LFS systems of the same book version. How best to backup $LFS/tools is a matter of personal

preference.

Caution

If you intend to keep the temporary tools for use in building future LFS systems, now is the time to back

them up. Subsequent commands in chapter 6 will alter the tools currently in place, rendering them useless

for future builds.

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MTD 248-645A Manual de usuario Pagina 95