Real Multilib Userland on Linux

Read multilib requirement on Android rom building and other stuff. About two years absent from getting rid with android rom. I have time to set and dating agin with android rom compiling festival. Firstly, setting-up build environment on Linux distro, ubuntu is the star of android rom compiling world. The critical point is the host must be multilib linux system. I do not well understand linux, since I just a lover and common user. I think by having precompiled 32 bit library in the 64 bit system will be annoying if the package version di not match. AFAIK, Gentoo is one the "easier" linux distro provided opportunity to have consitence system where 32 libs running congruently with 64 libs in a system.
Funtoo News provided very comprehensive reading material, and the article have been TWO YEARS old .... LOL.
Thus by setting USE Flag in /etc/portage/make.conf, by adding ABI_X86="32" system will merge all package nicely and build all package in dual libs. The reason only adding ABI_X86="32" instead of ABI_X86="32 64", my system is amd64 multilib, thus ABI_X86=64 is explicitly build in the system. Good bye emul-linux-x86-* stuff which sometimes blcoking, messing system. Many thanks for the smart developers. After building everything on dual libs, android sdk, android studio and rom source went flawlessly

dhcppc2 a mysterius hostname on OpenRC Gentoo 13.0 Plasma Desktop

I face annoying problem with localhost, Gentoo system 13.0 desktop/plasma profile with OpenRC set hostname to genT430since the setting to the box not finished yet, connection to home router via wpa_supplicant on wifi (No wired connection). After "considering everything set-up. Network manager activated, and nightmare coming. All application via plasma menu, Can Not Run at all, log back in into terminal and found hostname changed to dhcppc2 guessing ... it's coming from dhcp ( ver 4.3.3 ) upgrade dhcp to 4.3.4 but the problem persist. Sure everything run normally by changing hostname in /etc/conf.d/hostname with dhcppc2, editing /etc/hosts and stuff to follow mysterius hostname.

Browsing on the Net ... many users in various distro (fedora, archLinux, ubuntu) faced same problem. But NO COMPREHENSIVE solutions, using keywords to obtain higher version of NetworkManager, gentoo did not provide it ... I did not want to hunt in overlay space. Current solution is surrender to given hostname dhcppc2. I was bit lucky since the mysterious hostname constant to dhcppc2 which many users faced worse with uncertain hostname among dhcppc0 - dhcppc9
..... continue investigating and will update one upon a time .... LOL Solution
I used dhclient and caused got dhcppc2 hostname re-merge network manager, change USE flag from dhclient to dhcpcd; edit /etc/dhcpcd.conf >
option domain_name_servers, domain_name, domain_search, host_name
change to COMMENTED
#option domain_name_servers, domain_name, domain_search, host_name
hostname [empty]
changed to
hostname YourHostname


Bare Minimum Plasma-Desktop by Gentoo 13.0

LTS Ubuntu 16.04 have been released 2 months ago, I personally loved stable version on any application software. A new used box Lenovo T430 handed. What is the purpose of this laptops (?), very important to determine before buying a computer machine, since we must consider what Operating system and application will be sit in the box. As long time linux user, there is no other options, I must install Single boot Linux. It has been ambiguity to choose Linux Distro. Gentoo is my favorite meta distro all time, but I also love ubuntu.

The Box
Lenovo T430, Powered by Inter 3rd gen i5 3320M @ 2.60 Ghz, 2 x 8 GB DDR3 RAM INSTALLED, 320 GB SATA 3 storage, NITS Display with 1600 x 900 screen resolution in 14" LCD. Distro Choice
By choosing ubuntu 16.04 I'm on the stability consideration. I wish the box will be a box for Office Work Station, Listening Music, Watching Video, else, Android Rom Compiling, Tweak Smart Phones, and Little software development on odoo frameworks. But for some folks, ubuntu 16.04 is not stable enough
Software Landscape
Operating System Testing
Ubuntu 16.04 x86_64 with Linux Kernel 4.4.0 amd64
Application Installed

1. Ubuntu base system
2. Bare Minimum Plasma Destop
3. Libre Office 5.1
4. Firefox and Vivaldi Browser
5. Krita, Gwenview, Inkscape, Ksnapshot
6. VLC and Clementine Music Player
7. Set of Tools for Android ROM development
8. Android Studio IDE and Android SDK
9. Odoo version 9
10. Xterm, Konsole
11. Dolphin File Manager
12. Telegram and Whatsie IM
13. openjdk-8-jdk, openjdk-7-jdk

Story
I have tried ubuntu 16.04 installing by using net-boot, everything just fine "just work" as expected. From base system (command line), very nice to pick bare minimum Plasma Desktop from KDE up by typing # apt-get install plasma-desktop ubuntu will grab 601 package with SDDM as default in 14.04 the similar phrase will grab 630 package with lightDM as default in 14.04 phrase # apt-get install kde-plasma-desktop, will grab 664 packages. with KDM as default. ...... Testing "Kubuntu 16.04" for 4 days.
In fact, I always want to back to Gentoo for any reason, but installing gentoo always paint, learning some article about shinny ArchLinux the Golden son of Gentoo. I have no time to learn command of New Distro, then back to grandFather .... Gentoo Linux. The most reason my return to gentoo is, OpenRC, I did not search a lot, but default ubuntu 16.04 with K-Plasma using systemD. Gentoo offering nice profile Desktop/Plasma with OpenRC. No doubt systemD is nice and great modern init system ... I just wanna to stay in the comfort zone and wish to enjoy shinny Plasma.
I keep ubuntu up for comfortable in installing Gentoo, chrooting from ubuntu will be less hazzle and comfort, and I have prepared the partition accordingly in 320 GiB SATA HDD
/dev/sda1 EFI Partition 65 MiB mounted /boot/efi
/dev/sda2 EXT3 30 Gib mounted / [gentoo root]
/dev/sda3 EXT3 30 Gib mounted / [ubuntu root]
/dev/sda4 EXT4 60 Gib mounted /home [shared gentoo and ubuntu]
/dev/sda5 EXT4 98 Gib mounted /store [for storing any file including gentoo portage]
/dev/sda6 EXT4 99 Gib mounted /droid [for android and odoo development]
/dev/sda7 SWAP 512 Mib
It was old fashion to prepare 2 x RAM for swap. NOTE : I don't like hybernate, just suspend to RAM. Just Imagine by having 16 GB RAM, the rule of swap 2 x RAM = 32 GiB ??? No way.
Multilib
The most reason returning to gentoo linux for someone who do like Android ROM building and other stuff to Android is the preference, linux host must be amd64 profile multilib. Gentoo provide emul-linux-x86-*. Installing [SEPARATE] x86 [ abi_x86_32 ] libs on 64 bit system, will decrease performance, due to difference version of a package. Example you have package aaaa-v2 on 64 but binary package only provide aaa-v1 on 32. This will creating a bottle neck. I did not find a better way from gentoo to make all package on the similar version with capability to run in 64 and 32. In this case, the power of portage will help, since the distro compile everything as you need. Portage Power
Portage have USE Flags \multilib \ and option ABI_X86="32 64" with this feature enabled, everything package required "multilib" will be compiled congruently in 32 as well as 64, thus bottle neck flush out from out system. System will be stable and consistence.