build: Set ccache base to build top

This enables ccache sharing between different build tree paths.

Change-Id: I99636bdd2779a6ccf0649f027e35cf67df44b6ae
build: Add new public keys to recovery

Change-Id: I11dea464297813be36e60c23728dde8893535c46
build: Include an extra device.mk

Change-Id: I4373f78f57c81e46affc2f6a6bc854bf4c3d00db
Merge "build: Set ccache base to build top" into cm-11.0
Don't set CCACHE_BASEDIR if its already set

 * enable use of shared ccache

Change-Id: Ic708a5d5169291d674b167aa2c87bf2c8adaafae
ota: Generate recovery-from-boot.p file

This may be wanted to update the recovery with system updates

Change-Id: Iacd41be7a8018cbc08b2606485d446756910f506
Change CM recovery install script filename [1/2]

This is part 1/2 to maintain backwards compatibility with CWM's
verify_root_and_recovery() function. CWM checks if install-recovery.sh
exists and has an executable flag set, then offers to disable the script
for the user. CM now controls this with the persist.sys.recovery_update
property which is configurable via settings, so we don't need to
double-check this.

This changes the name of the recovery install script to
install-cm-recovery.sh.

Change-Id: Ie08d428cfd092a1de10973ba5ffc326ccdb1a369
keys: avoid duplicating recovery keys

Setting PRODUCT_EXTRA_RECOVERY_KEYS duplicates the default key and
makes it so we can't set an extra key earlier in the build

Change-Id: I239d9994d9ad40b1779877ea2e89b55bd02e4c00
ota: Allow devices to skip generation of recovery-from-boot.p

* Not all devices have a real recovery partition, so those devices
  should skip this generation step.

Change-Id: I4abc3f92b879e6997e4874543ec9772c3179b1d0
 4.8 GCC, Strict Aliasing=3, -O3 CFLAG, Opt Flags!!

For those of you who are building cm-11.0 with the neofy script,
none of this stuff applies to you as the script did it all for you ;)

To everyone else:
With this commit, you will be heavily modifying your build environment. What this
will do, is allow you the freedom of using any custom toolchain of your choice,
provided you follow two simple rules:

RULE #1: Both the androideabi and armeabi toolchain folders of your choice HAVE to
be named like the following:

for androideabi, the folder has to be prefixed with: arm-linux-androideabi-
and for arm-eabi, the folder has to be prefixed with: arm-eabi-

ex:

If you want to use GCC-4.8 as your toolchain of choice, both the androideabi and
armeabi folders have to look like this:

arm-linux-androideabi-4.8
arm-eabi-4.8

if you want them to be different, say, 4.8 for the arm-eabi and 4.9 for androideabi,
then they should look like this:

arm-eabi-4.8
arm-linux-androideabi-4.9

Take note, that if usining linaro, you will have to clone in the toolchain twice as
this method requires two different folders (the way it should be IMO). You would need
to rename one of the clones to arme-abi- and the other to arm-linux-androideabi-.

SECTION 2
RULE #2: The default configuration I've set is to build with GCC 4.8 for androideabi and 4.8 for
armeabi by default (in core/combo/TARGET_linux-arm.mk lines 50-51) unless you specify an alternate
target chain on those two lines! So if you want to use a different chain, you'll
need to change the build numbers on those two lines. for Example:

Say you wanted to use a 4.7 chain instead for armeabi and 4.8 for androideabi.. You would
change lines 50 and 51 to the following:

TARGET_GCC_VERSION_ARM := 4.7
TARGET_GCC_VERSION_AND := 4.8

Notice at the end of each line one is for ARM and one is for AND which hints at armeabi
and androideabi and the only thing you're changing is the number.

You also need to make sure rule number 1 is observed if you do this.. Can't build with
an alternate chain if one is not present ;) Personally, I've found the following two
toolchains to be the best without any drawback to rom (sans ART) courtesy of sparksco:

https://github.com/SaberMod/android_prebuilts_gcc_linux-x86_arm_sabermod-arm-eabi-4.8
https://github.com/SaberMod/android_prebuilts_gcc_linux-x86_arm_sabermod-arm-linux-androideabi-4.8

MAKE SURE YOU PULL BOTH FROM THE sm-kk-mr1 BRANCH IF YOU DECIDE TO USE THESE CHAINS!

This build commit also changes your global compiler ARM flags to -O3. -O3 is an option
that enables all -O1 and -O2 flag options as well as some heavy -O3 flag options that build
for optimized performance!

This commit also adds a few optimization flags that I've pre-selected for added performance.

This commit also builds the entire rom using a Strict Aliasing rule set at the highest level
of =3 and set to error on every strict aliasing issue. Make sure that you have all the
proper strict aliasing commits needed! If you can't find them, they will be
available to you on my github account at https://github.com/IAmTheOneTheyCallNeo

to make your search for all those needed easier, you can find all of them in the following script:
https://github.com/vigor/android/blob/cm-11.0/neofy.sh

Contact me if you have any issues and I will help you when and if I can.

-Neo
build kernel with GCC 4.10

Change-Id: Iafbb4dfde0cc52718e9eea31cd868591274872e9