Chapter 15 : Compile and Install Glibc - Compiling a Cross-Toolchain

Hi,

In this chapter, we are going to compile Glibc package.

Note :

- Please check the version of the package when you compile and install, at the time of writing the package was at version 2.32

- You should be logged in as lfs user, when you perform the actions described here.

- Change directory to the sources folder (/mnt/lfs/sources)

- Please check http://linuxfromscratch.org/lfs/view/stable/chapter05/glibc.html for more details.

Before we compile the package, there are certain directories to be created at the location /mnt/lfs.

Use the following command to create the required directories, along with creating the directories we have change the ownership of the directories created.

$ sudo mkdir lib

$ sudo chown lfs lib

$ sudo mkdir etc

$ sudo chown lfs etc

$ sudo mkdir var

$ sudo chown lfs var

$ sudo mkdir lib64

$ sudo chown lfs lib64

Now extract the glibc package using the following command.

$ sudo cd $LFS/sources

$ tar -xvf glibc-2.32.tar.xz

After successful extraction, change directory to glibc-2.32

$ cd glibc-2.32

Create a symbolic link for LSB compliance. Additionally, for x86_64, create a compatibility symbolic link required for proper operation of the dynamic library loader

 $ case $(uname -m) in

    i?86)   ln -sfv ld-linux.so.2 $LFS/lib/ld-lsb.so.3

    ;;

    x86_64) ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64

            ln -sfv ../lib/ld-linux-x86-64.so.2 $LFS/lib64/ld-lsb-x86-64.so.3

    ;;

esac

Command to apply the patch to make some of the glibc programs use the non-FHS compliant /var/db directory to store their runtime data

$ patch -Np1 -i ../glibc-2.32-fhs-1.patch

Creating the build directory.

$ mkdir -v build

$ cd build

Preparing glibc for compilation...

$ ../configure                             \

      --prefix=/usr                      \

      --host=$LFS_TGT                    \

      --build=$(../scripts/config.guess) \

      --enable-kernel=3.2                \

      --with-headers=$LFS/usr/include    \

      libc_cv_slibdir=/lib

Compiling the package...

$ make -j4

Installing the package...

$ make DESTDIR=$LFS install

If you would like to have a sanity check on the glibc package, you can make use of the following instructions...

echo 'int main(){}' > dummy.c

$LFS_TGT-gcc dummy.c

readelf -l a.out | grep '/ld-linux'

The execution of the above commands should result like the one given below...

[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]

Now that our cross-toolchain is complete, finalize the installation of the limits.h header. For doing so, run a utility provided by the GCC developers

$ $LFS/tools/libexec/gcc/$LFS_TGT/10.2.0/install-tools/mkheaders

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