1 android build system
1.1 architecture
1.1.1 build figure


1.1.2 add logs
$(info )

1.1.3 configuration
// todo

1.1.4 environment setup
script: build/envsetup.sh
zzy@zzy-ubuntu:$ source build/envsetup.sh
HTC flags cleared.
including device/htc/common/vendorsetup.sh
including device/generic/x86/vendorsetup.sh
including device/generic/armv7-a-neon/vendorsetup.sh
including device/generic/mips/vendorsetup.sh
including vendor/qcom/proprietary/common/vendorsetup.sh
including vendor/qcom/proprietary/vendorsetup.sh
including sdk/bash_completion/adb.bash
zzy@zzy-ubuntu:$ hmm
Invoke ". build/envsetup.sh" from your shell to add the following functions to your environment:
- lunch:   lunch <product_name>-<build_variant>
- tapas:   tapas [<App1> <App2> ...] [arm|x86|mips|armv5] [eng|userdebug|user]
- croot:   Changes directory to the top of the tree.
- m:       Makes from the top of the tree.
- mm:      Builds all of the modules in the current directory, but not their dependencies.
- mmm:     Builds all of the modules in the supplied directories, but not their dependencies.
- mma:     Builds all of the modules in the current directory, and their dependencies.
- mmma:    Builds all of the modules in the supplied directories, and their dependencies.
- cgrep:   Greps on all local C/C++ files.
- jgrep:   Greps on all local Java files.
- resgrep: Greps on all local res/*.xml files.
- godir:   Go to the directory containing a file.

1.1.5 function definitions
// todo

1.1.6 main make recipes
// todo

1.1.7 cleaning
If you change configuration when make or make module, the build output would be automaically pruned using installclean
*** Build configuration changed:
....
*** Forcing "make installclean"...

1.1.8 module build templates
Moudle build templates list



add an Android.mk template
(1) LOCAL_PATH := $(call my-dir)
(2) include $(CLEAR_VARS)      # action
(3) LOCAL_VARIABLE_1 := value_1
LOCAL_VARIABLE_2 := value_2
...
(4) include $(BUILD_MODULE_TYPE) # action

(1) Tells the build template where the current module is located.
(2) Clears all previously set  LOCAL_* variables that might have been set for other
modules.
(3) Sets various  LOCAL_* variables to module-specific values.
(4) Invokes the build template that corresponds to the current module’s type.

example
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SHARED_LIBRARIES := liblog
LOCAL_SRC_FILES := service_manager.c binder.c
LOCAL_MODULE := servicemanager
ifeq ($(BOARD_USE_LVMX),true)
LOCAL_CFLAGS += -DLVMX
endif
include $(BUILD_EXECUTABLE)

1.1.9 output
// todo
more info [1]

2 kernel build system
// todo

3 build commands
hboot
cd hboot/
make clean
make env-msm8226 -j8
sudo htc_fastboot flash hboot out/target/product/msm8226/hboot.img

kernel
make ARCH=arm CROSS_COMPILE=arm-eabi- a5dwg_defconfig
make ARCH=arm CROSS_COMPILE=arm-eabi- -j8

build framework module
// build services
source build/envsetup.sh; partner_setup htc_a3qhdul A3QHDUL_Generic_WWE_DEBUG
make services -j8

view version
lunch htc_a5dug-eng

remote build
vendor/tuxera/exfat/tuxera_update_htc.sh -> do_remote_build()

build module
source build/envsetup.sh; partner_setup xxx;
make services -j8      // services.jar
make -j8 bootimage   // boot.img

compiler error
1. mrproper
enter kernel directory
    make mrproper
    make distclean
2. fatal error: zconf.hash.c: No such file or directory
rm -rf out/
retry
reference:[2]

reference
[1] http://www.it-ebooks.info/book/2073/
    《Embedded Android》chapter 4: the build system
[2] http://forum.xda-developers.com/showthread.php?t=1604540&page=3
[3] http://lwn.net/Articles/21835/
[4] https://www.kernel.org/doc/Documentation/kbuild/modules.txt

------------------------
android repo study
	对呀，慢慢看源代码，就会搞清楚哪些文件是怎么来的。
	是从repo这个脚本为入口点开始吧。
	是。
	那个还有一个trick，就是那个脚本既可以bash运行，又可以用python运行。
	#!/usr/bin/env python
	   -- 这一行？
	不是。现在的版本好像已经改了，以前我看到版本是可以的。
	我们reop init总是失败，所以repo init的时候，总是用的老的工程里面的。
	找你们repo的管理人解决呀。
	假设你们自己的镜像不就解决了。
	架设。
	有什么教程吗？
	我可以现在自己的局域网pc中实验吗？
	当然可以。
	repo init --repo-url=xxxx ...
	很简单的事。
	qualcomm的repo应该是用的被他们改过的版本，应该没有这个问题。
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android function
// Android编译PRODUCT_COPY_FILES如果碰到重复的项目如何取值
http://blog.csdn.net/howellzhu/article/details/42841669