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Patrick Tjin 3f5f9934e9 build_image: default extfs reserved size to 0 on RO partitions. 
Defaults the reserved blocks for root to 0% on read only partitions
(system, system_other, vendor, oem).  It also adds support for
explicitly specifying the extfs reserved percentage via
BOARD_{SYSTEM,VENDOR,OEM,PRODUCT}IMAGE_EXTFS_RSV_PCT.

This eventually translates down to the -m option for mkfs.

Removing the reserved space can save at least  5% from the default.

  dumpe2fs system:
    Reserved blocks uid:      0 (user root)
    Reserved blocks gid:      0 (group root)

Bug: 75975085
Test: Build, verify reserved space is changed accordingly
Change-Id: I212d82741908b636db0d658a1c4847bbaadfd5ba
(cherry picked from commit 5ff758799c)
2018-04-22 22:04:21 -07:00
core build_image: default extfs reserved size to 0 on RO partitions. 2018-04-22 22:04:21 -07:00
target Remove obsolete (and broken) targets. 2018-04-20 15:18:22 -07:00
tests Only set TARGET_PLATFORM version in lunch when explicitly requested 2017-05-03 02:47:59 +00:00
tools build_image: default extfs reserved size to 0 on RO partitions. 2018-04-22 22:04:21 -07:00
.gitignore Add build subprojects to .gitignore 2015-07-23 13:18:47 -07:00
Android.mk Fix the build when using findleaves.py 2017-08-08 09:45:12 -07:00
buildspec.mk.default Add TARGET_PLATFORM_VERSION to lunch 2017-03-23 09:44:08 -07:00
Changes.md Remove unnecessary USE_CLANG_PLATFORM_BUILD. 2018-01-11 14:29:23 -08:00
CleanSpec.mk Add asan-specific CleanSpec 2018-03-20 15:44:43 -07:00
envsetup.sh Start moving add_lunch_combo to Make 2018-04-04 17:14:47 -07:00
help.sh Support /product partition 2018-01-25 09:33:58 +09:00
navbar.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
OWNERS Add Nan to OWNERS 2018-01-18 15:50:07 -08:00
README.md Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00
tapasHelp.sh Remove armv5te 2018-01-08 15:26:16 -08:00
Usage.txt Mark envsetup.sh vars as deprecated in makefiles 2017-11-28 14:19:50 -08:00

README.md

Android Make Build System

This is the Makefile-based portion of the Android Build System.

For documentation on how to run a build, see Usage.txt

For a list of behavioral changes useful for Android.mk writers see Changes.md

For an outdated reference on Android.mk files, see build-system.html. Our Android.mk files look similar, but are entirely different from the Android.mk files used by the NDK build system. When searching for documentation elsewhere, ensure that it is for the platform build system -- most are not.

This Makefile-based system is in the process of being replaced with Soong, a new build system written in Go. During the transition, all of these makefiles are read by Kati, and generate a ninja file instead of being executed directly. That's combined with a ninja file read by Soong so that the build graph of the two systems can be combined and run as one.