引言：
编译android时，第一个编译的是jsr305lib，一直很好奇，终于有时间分析下原因了；
拷贝到本地，设置为不自动换行，阅读跟方便；
第一部分：整体次序
1 .PHONY: droid
DEFAULT_GOAL := droid
$(DEFAULT_GOAL):
终极目标为droid；
2.droid: droidcore dist_libraries
3：droidcore有效的依赖为
droidcore: doc-comment-check-docs
droidcore: checkapi
droidcore: files \
systemimage \
$(INSTALLED_BOOTIMAGE_TARGET) \ #bootimage没有编译规则
$(INSTALLED_RECOVERYIMAGE_TARGET) \ #recovery.img
$(INSTALLED_USERDATAIMAGE_TARGET) \ #userdata.img
$(INSTALLED_PERSISTIMAGE_TARGET) \ #persist.img
$(INSTALLED_CACHEIMAGE_TARGET) \ #cache.img
$(INSTALLED_TOMBSTONESIMAGE_TARGET) \ #tombstones.img
$(INTERNAL_OTA_PACKAGE_TARGET) \ #msm7627a-ota-eng.***.zip
$(INTERNAL_OTA_PACKAGE_TARGET_2K) \ #msm7627a-ota-eng.***_mmc--2k.zip
$(INTERNAL_MMC_OTA_PACKAGE_TARGET) \ #msm7627a-ota-eng.***_mmc.zip
$(INSTALLED_FILES_FILE) #installed-files.txt
4： files的有效依赖
.PHONY: files
files: prebuilt \
$(modules_to_install) \ ###所有需要编译的对象通过$(tag)_MODULES和Default_MODULES添加
$(modules_to_check) \ ###对BUILD_HOST_JAVA_LIBRARY需要检查下是否编译；
$(INSTALLED_ANDROID_INFO_TXT_TARGET)#android-info.txt
prebuilt: $(ALL_PREBUILT)
ALL_PREBUILT = out/target/product/msm7627a/system/usr/share/zoneinfo/zoneinfo.dat
。。。。。。。。。。。。
target Prebuilt: system_etcdir (out/target/product/msm7627a/system/etc/gps.conf)
编译次序：
【doc-comment-check-docs】【checkapi】【prebuilt】【modules_to_install】【modules_to_check】【systemimage】
【bootimage】【recovery.img】。。。【msm7627a-ota-eng.***_mmc.zip】
第二部分，详细分析doc-comment-check-docs
由droidcore: doc-comment-check-docs引起的编译
doc-comment-check-docs【Docs droiddoc】依赖:
droiddoc = out/host/linux-x86/framework/doclava.jar
full_java_lib_deps=
out/target/common/obj/JAVA_LIBRARIES/bouncycastle_intermediates/javalib.jar out/target/common/obj/JAVA_LIBRARIES/core_intermediates/javalib.jar
out/target/common/obj/JAVA_LIBRARIES/ext_intermediates/javalib.jar out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/javalib.jar
out/target/common/obj/framework.aidl【Aidl Preprocess】
第一节【Install:doclava.jar】
由目标out/host/linux-x86/framework/doclava.jar【Install:doclava.jar】引起的编译
out/host/linux-x86/framework/doclava.jar【Install:doclava.jar】依赖：
out/host/linux-x86/framework/jsilver.jar【Install:jsilver.jar】（jsilver依赖guavalib，后者先编译）
out/host/linux-x86/framework/guavalib.jar【Install:guavalib.jar】
out/host/linux-x86/framework/antlr.jar【Install:antlr.jar】
/usr/lib/jvm/java-6-sun/lib/tools.jar###已存在不需要编译
out/host/linux-x86/framework/guavalib.jar【Install:guavalib.jar】依赖：
out/host/common/obj/JAVA_LIBRARIES/jsr305lib_intermediates/javalib.jar【host Java: jsr305lib】
out/host/common/obj/JAVA_LIBRARIES/guavalib_intermediates/javalib.jar【host Java: guavalib】
out/host/linux-x86/bin/acp 【Install:acp】注：$(LOCAL_INSTALLED_MODULE): $(LOCAL_BUILT_MODULE) | $(ACP)
out/host/linux-x86/obj/NOTICE_FILES/src//framework/guavalib.jar.txt【Notice file:guavalib.jar.txt】
out/host/linux-x86/bin/acp【Install:acp】依赖：
out/host/linux-x86/obj/EXECUTABLES/acp_intermediates/acp.o【host C: acp】 ###c文件编译会引起头文件的copy
out/host/linux-x86/obj/STATIC_LIBRARIES/libhost_intermediates/libhost.a【host StaticLib: libhost】
out/host/linux-x86/obj/EXECUTABLES/acp_intermediates/acp【host Executable: acp】
out/host/linux-x86/obj/STATIC_LIBRARIES/libhost_intermediates/libhost.a 依赖：
out/host/linux-x86/obj/STATIC_LIBRARIES/libhost_intermediates/pseudolocalize.o 【host C++：pseudolocalize】
out/host/linux-x86/obj/STATIC_LIBRARIES/libhost_intermediates/CopyFile.o【host C: CopyFile】
编译次序为：
【host Java: jsr305lib】【host Java: guavalib】【头文件拷贝】【host C: acp】【host C++：pseudolocalize】 【host C: CopyFile】【host StaticLib: libhost】
【host Executable: acp】【Notice file:guavalib.jar.txt】【Install:guavalib.jar】【Install:jsilver.jar】【Install:antlr.jar】 【Install:doclava.jar】
第二节【target Jar: bouncycastle】
由目标out/target/common/obj/JAVA_LIBRARIES/bouncycastle_intermediates/javalib.jar【target Jar: bouncycastle】引起的编译
out/target/common/obj/JAVA_LIBRARIES/bouncycastle_intermediates/javalib.jar【target Jar: bouncycastle】依赖：
out/target/common/obj/JAVA_LIBRARIES/bouncycastle_intermediates/noproguard.classes.dex【target Dex: bouncycastle】
AAPT = out/host/linux-x86/bin/aapt【Install:aapt】注：$(common_javalib.jar) : $(built_dex) $(java_resource_sources) | $(AAPT)
out/target/common/obj/JAVA_LIBRARIES/bouncycastle_intermediates/noproguard.classes.dex【target Dex: bouncycastle】依赖：
out/target/common/obj/JAVA_LIBRARIES/bouncycastle_intermediates/classes-full-debug.jar【target Java：bouncycastle】
Install: out/host/linux-x86/framework/jarjar.jar【Install：jarjar.jar】注：$(full_classes_jarjar_jar): $(full_classes_compiled_jar) | $(JARJAR)
noproguard.classes.jar，noproguard.classes-with-local.dex，noproguard.classes.dex###bouncycastl还会依赖这三个目标不单独列出
out/target/common/obj/JAVA_LIBRARIES/bouncycastle_intermediates/classes-full-debug.jar【target Java：bouncycastle】依赖：
out/target/common/obj/JAVA_LIBRARIES/core_intermediates/javalib.jar【target Jar:core】 依赖：
由目标out/target/common/obj/JAVA_LIBRARIES/core_intermediates/javalib.jar【target Jar:core】引起的编译
out/target/common/obj/JAVA_LIBRARIES/core_intermediates/javalib.jar【target Jar: core】依赖：
out/target/common/obj/JAVA_LIBRARIES/core_intermediates/noproguard.classes.dex【target Dex: core】
AAPT = out/host/linux-x86/bin/aapt【Install:aapt】注：$(common_javalib.jar) : $(built_dex) $(java_resource_sources) | $(AAPT)
out/target/common/obj/JAVA_LIBRARIES/core_intermediates/noproguard.classes.dex【target Dex: core】依赖
out/target/common/obj/JAVA_LIBRARIES/core_intermediates/noproguard.classes.jar【Copying：core】###这里包括classes.jar，classes-jarjar.jar，/classes-jarjar.jar，target Java: core
DX = out/host/linux-x86/bin/dx【Install:dx】 注：$(built_dex_intermediate): $(full_classes_proguard_jar) $(DX)
DX = out/host/linux-x86/bin/dx【Install:dx】依赖：
out/host/linux-x86/framework/dx.jar【install:dx.jar】###依赖【host Java: dx】在david/dx/src/android.mk定义
out/host/linux-x86/obj/EXECUTABLES/dx_intermediates/dx【Copy:dx】###dx没有是使用base_rules.mk中定义的依赖和生成命令，而是在david/dx/android.mk中定义；
由out/host/linux-x86/bin/aapt【Install:aapt】引起的编译
out/host/linux-x86/bin/aapt【Install:aapt】依赖：
all_objects = out/host/linux-x86/obj/EXECUTABLES/aapt_intermediates/AaptAssets.o【host C++：AaptAssets】...###LOCAL_SRC_FILES中的c++引起的编译；
all_libraries = out/host/linux-x86/obj/STATIC_LIBRARIES/libhost_intermediates/libhost.a###已生成
out/host/linux-x86/obj/STATIC_LIBRARIES/libutils_intermediates/libutils.a【host StaticLib:libutils】
out/host/linux-x86/obj/STATIC_LIBRARIES/liblog_intermediates/liblog.a【host StaticLib:liblog】
out/host/linux-x86/obj/STATIC_LIBRARIES/libcutils_intermediates/libcutils.a【host StaticLib:libcutils】
out/host/linux-x86/obj/STATIC_LIBRARIES/libexpat_intermediates/libexpat.a【host StaticLib:libexpat】
out/host/linux-x86/obj/STATIC_LIBRARIES/libpng_intermediates/libpng.a 【host StaticLib:libpng】
注：$(LOCAL_BUILT_MODULE): $(all_objects) $(all_libraries)
out/host/linux-x86/obj/STATIC_LIBRARIES/libutils_intermediates/libutils.a【host StaticLib:libutils】依赖：
out/host/linux-x86/obj/STATIC_LIBRARIES/libutils_intermediates/Asset.o【host C++：Asset】...###LOCAL_SRC_FILES中的c++引起的编译；
编译次序为：
【Copying：core】【install:dx.jar】【Copy:dx】【Install:dx】【target Dex: core】【host C++：AaptAssets】【host C++：Asset】
【host StaticLib:libutils】【host StaticLib:liblog】【host StaticLib:libcutils】【host StaticLib:libexpat】【host StaticLib:libpng】
【Install:aapt】【target Jar：core】【target Java：bouncycastle】【Install：jarjar.jar】【target Jar: bouncycastle】