Imported rest of the build from Musl-LFS... including updating the ke…

…rnel build with LLVM.

3-chroot/095-clean-up

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+# Clean up of final system
+
+# While in chroot...
+rm -rvf /tmp/*
+exit
+
+# Re-enter chroot:
+export CMLFS=/mnt/cmlfs
+
+chroot "$CMLFS" /usr/bin/env -i          \
+    HOME=/root TERM="$TERM"            \
+    PS1='(cmlfs chroot) \u:\w\$ '        \
+    PATH=/bin:/usr/bin:/sbin:/usr/sbin \
+    /bin/bash --login
+
+# Now remove unecessary files:
+rm -fv /usr/lib/lib{bfd,opcodes}.a
+rm -fv /usr/lib/libbz2.a
+rm -fv /usr/lib/lib{com_err,e2p,ext2fs,ss}.a
+rm -fv /usr/lib/libltdl.a
+rm -fv /usr/lib/libfl.a
+rm -fv /usr/lib/libz.a
+find /usr/lib /usr/libexec -name \*.la -delete
+
+# It is also safe to remove /llvmtools and /cross-tools directories as they're not required anymore

3-chroot/097-network-config

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+### General Network Configuration
+### This section is done in Chroot environment
+### May skip if no networking is needed
+
+
+# Create Network Interface Configuration File(s)
+
+# For a wifi card:
+# Requires wpa_supplicant and dhcpcd
+cat > /etc/sysconfig/ifconfig.wlan0 << "EOF"
+ONBOOT="yes"
+IFACE="wlan0"
+SERVICE="wpa"
+
+WPA_ARGS=""
+
+WPA_SERVICE="dhcpcd"
+DHCP_START="-b -q"
+DHCP_STOP="-k"
+EOF
+
+# For a ethernet card with static ip address:
+cat > /etc/sysconfig/ifconfig.eth0 << "EOF"
+ONBOOT=yes
+IFACE=eth0
+SERVICE=ipv4-static
+IP=192.168.1.2
+GATEWAY=192.168.1.1
+PREFIX=24
+BROADCAST=192.168.1.255
+EOF
+
+# Creating the /etc/resolv.conf File
+cat > /etc/resolv.conf << "EOF"
+# Begin /etc/resolv.conf
+
+#domain <Your Domain Name>
+#nameserver <IP address of your primary nameserver>
+#nameserver <IP address of your secondary nameserver>
+
+# End /etc/resolv.conf
+EOF
+
+# Set the hostname
+# in this eample, 'mlfs':
+ln -v /etc/s6/env/HOSTNAME /etc/hostname
+echo "cmlfs" > /etc/hostname
+
+# Create the /etc/hosts file
+cat > /etc/hosts << "EOF"
+# Begin /etc/hosts
+
+127.0.0.1 localhost localhost.localdomain cmlfs.localdomain cmlfs
+::1       localhost localhost.localdomain cmlfs.localdomain cmlfs
+ff02::1   ip6-allnodes
+ff02::2   ip6-allrouters
+
+# End /etc/hosts
+EOF

3-chroot/099-fstab

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+# Final System: Fstab
+# This section is done in Chroot environment
+
+# The /etc/fstab file is used by some programs to determine where file systems 
+# are to be mounted by default, in which order, and which must be checked (for 
+# integrity errors) prior to mounting. Create a new file systems table like thisi and modify accordingly: 
+
+cat > /etc/fstab << "EOF"
+# Begin /etc/fstab
+
+# file system    mount-point   type     options             dump  fsck
+#                                                                 order
+
+/dev/<xxx>       /             <fff>    defaults            1     1
+/dev/<yyy>       swap          swap     pri=1               0     0
+none            /dev/shm      tmpfs   rw,nosuid,nodev,noexec 0 0
+# S6 boot mounts these at startup
+#proc            /proc          proc     nosuid,noexec,nodev 0     0
+#sysfs           /sys           sysfs    nosuid,noexec,nodev 0     0
+#devpts          /dev/pts       devpts   gid=5,mode=620      0     0
+#tmpfs           /run           tmpfs    defaults            0     0
+#devtmpfs        /dev           devtmpfs mode=0755,nosuid    0     0
+
+# On a EFI system, may need to mount the EFI parition
+#/dev/sda1       /mnt/uefi       vfat            defaults                0 0
+#/mnt/uefi/EFI   /boot/efi       none            defaults,bind           0 0
+
+# End /etc/fstab
+EOF

3-chroot/100-kernel

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+# Final System: Linux Kernel
+# Source: https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.2.11.tar.xz 
+# This section is done in Chroot environment
+
+# Prepare for compilation by running the following command:
+make mrproper
+
+# Configure kernel:
+LLVM=1 LLVM_IAS=1 make menuconfig
+
+# Compile the kernel image and modules: 
+LLVM=1 LLVM_IAS=1 make
+
+# Install the modules, if the kernel configuration uses them:
+LLVM=1 LLVM_IAS=1 make modules_install
+
+# Install the kernel:
+cp -iv arch/x86/boot/bzImage /boot/vmlinuz
+
+# Install the symbol file for the kernel:
+cp -iv System.map /boot/System.map
+
+# Install the kernel configuration file .config produced by the make menuconfig:
+cp -iv .config /boot/config
+
+# Then create the initramfs image required by bootscripts
+# Use the name of the kernel, which can be found in /lib/modules:
+# i.e.  /lib/modules/5.2.11
+mkinitramfs <kernel name>
+# i.e.  mkinitramfs 5.2.11
+cp -va initrd.img-<kernel name> /boot/initrd.img

3-chroot/101-boot-loader

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+# Final System: Bootloader Setup
+# This section is done in Chroot environment
+
+
+########################### If using GRUB as boot loader: ######################################
+
+# **** The following command will overwrite the current *****
+# **** boot loader. Do not run the command if this is not ***
+# **** desired, for example, if using a third party boot ****
+# **** manager to manage the Master Boot Record (MBR). ******
+# Example assumes CMLFS is on /dev/sda2
+grub-install /dev/sda
+
+# OR install bootloader on a bootable partition
+grub-install /dev/sda1
+
+# Create the GRUB Configuration File:
+# Example assumes MLFS is on /dev/sda2 
+
+cat > /boot/grub/grub.cfg << "EOF"
+# Begin /boot/grub/grub.cfg
+set default=0
+set timeout=5
+
+insmod ext2
+set root=(hd0,2)
+
+menuentry "GNU/Linux, Clang-Musl Linux" {
+        linux   /boot/vmlinuz root=/dev/sda2 ro
+        initrd  initrd.img
+}
+EOF
+
+########################## If using rEFInd for UEFI systems: ##################################
+
+# You may need to unpack package under host and repackage it as a .xz, .tar, or .bz2
+#
+# Check http://www.rodsbooks.com/refind/ for more specific info on your target hardware
+#
+# Prebuilt binaries will be installed here. Building from source requires:
+#  * The TianoCore EDK2/UDK package (https://github.com/tianocore/edk2)
+#  or
+#  * The GNU-EFI package (http://sourceforge.net/projects/gnu-efi/)
+
+# Mount the efi partition
+# For example, if efi partition is /dev/sda1:
+mkdir -pv /mnt/efi
+mount -v /dev/sda1 /mnt/efi
+
+# Create required directories:
+mkdir -pv /mnt/efi/EFI/BOOT
+
+# Install rEFInd:
+cp -v   refind/refind_x64.efi      /mnt/efi/EFI/BOOT/
+cp -vr  refind/icons               /mnt/efi/EFI/BOOT/
+cp -vr  refind/drivers_x64         /mnt/efi/EFI/BOOT/
+cp -vr  refind/tools_x64           /mnt/efi/EFI/BOOT/
+cp -vr  refind/refind.conf-sample  /mnt/efi/EFI/BOOT/refind.conf
+
+########################## For ARM ##########################
+Depending on target, boot loader may be u-boot.

3-chroot/102-The-End

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+# The End
+
+# It may be a good idea to create an /etc/lfs-release file. By having this 
+# file, it is very easy for you (and for us if you need to ask for help at 
+# some point) to find out which LFS version is installed on the system. 
+# Create this file by running: 
+echo 1.0 > /etc/cmlfs-release
+
+# It is also a good idea to create a file to show the status of your new 
+# system with respect to the Linux Standards Base (LSB). To create this file, run: 
+cat > /etc/lsb-release << "EOF"
+DISTRIB_ID="Clang Musl Linux From Scratch"
+DISTRIB_RELEASE="1.0"
+DISTRIB_CODENAME="<your name here>"
+DISTRIB_DESCRIPTION="Clang Musl Linux From Scratch"
+EOF
+
+## Rebooting the System 
+
+# Exit chroot and unmount CMLFS
+logout
+umount -v $CMLFS/dev/pts
+umount -v $CMLFS/dev
+umount -v $CMLFS/run
+umount -v $CMLFS/proc
+umount -v $CMLFS/sys
+
+# Unmount if CMLFS is on a seperate partition or HDD/SDD/device
+umount -v $CMLFS
+
+# You may reboot your machine [if host and target are the same]
+