android 预制32 64 位so， bin

预制有源码和无源码32 ， 64 bit so bin 通过LOCAL_MODULE_TARGET_ARCHS 、 LOCAL_MULTILIB 控制

LOCAL_PATH := $(call my-dir)
sources := \
   tvini.c \
   mmap.c \
   spi.c
cincludes := \
   $(TARGET_OUT_HEADERS) \
   $(TARGET_UTOPIA_LIBS_DIR)/include \
    external/iniparser
# libmutils.so
# ==============================================================================
include $(CLEAR_VARS)
LOCAL_MODULE := libmutils
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := $(sources)
LOCAL_C_INCLUDES := $(cincludes)
LOCAL_CFLAGS := -DMSOS_TYPE_LINUX-DENABLE_LOGGER
LOCAL_SHARED_LIBRARIES := liblog libutopialibiniparser libcutils
WEWWW
include $(BUILD_SHARED_LIBRARY)
   
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---

对于有源码，只编译32 lib的so

LOCAL_PATH := $(call my-dir)
sources := \
   tvini.c \
   mmap.c \
   spi.c
cincludes := \
   $(TARGET_OUT_HEADERS) \
   $(TARGET_UTOPIA_LIBS_DIR)/include \
   external/iniparser
# libmutils.so
#==============================================================================
include $(CLEAR_VARS)
LOCAL_MODULE := libmutils
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := $(sources)
LOCAL_C_INCLUDES := $(cincludes)
LOCAL_CFLAGS := -DMSOS_TYPE_LINUX-DENABLE_LOGGER
LOCAL_SHARED_LIBRARIES := liblog libutopialibiniparser libcutils
LOCAL_32_BIT_ONLY := true
include $(BUILD_SHARED_LIBRARY)
   
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---

或者采用下面的这种方法

LOCAL_PATH := $(call my-dir)
sources := \
   tvini.c \
   mmap.c \
   spi.c
cincludes := \
   $(TARGET_OUT_HEADERS) \
   $(TARGET_UTOPIA_LIBS_DIR)/include \
   external/iniparser
# libmutils.so
# ==============================================================================
include $(CLEAR_VARS)
LOCAL_MODULE := libmutils
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := $(sources)
LOCAL_C_INCLUDES := $(cincludes)
LOCAL_CFLAGS := -DMSOS_TYPE_LINUX -DENABLE_LOGGER
LOCAL_SHARED_LIBRARIES := liblog libutopialibiniparser libcutils

LOCAL_MODULE_TARGET_ARCH:= arm
LOCAL_MULTILIB := 32

include $(BUILD_SHARED_LIBRARY)
   
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---

对于有源码，但是只需要编译64 bit的so

LOCAL_PATH := $(call my-dir)
sources := \
   tvini.c \
   mmap.c \
   spi.c
cincludes := \
   $(TARGET_OUT_HEADERS) \
   $(TARGET_UTOPIA_LIBS_DIR)/include \
   external/iniparser
# libmutils.so
#==============================================================================
include $(CLEAR_VARS)
LOCAL_MODULE := libmutils
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := $(sources)
LOCAL_C_INCLUDES := $(cincludes)
LOCAL_CFLAGS := -DMSOS_TYPE_LINUX-DENABLE_LOGGER
LOCAL_SHARED_LIBRARIES := liblog libutopialibiniparser libcutils

LOCAL_MODULE_TARGET_ARCH:= arm64
LOCAL_MULTILIB := 64

include $(BUILD_SHARED_LIBRARY)
   
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---

下面在说一下没有源码，预制so的方式 
对于有32 跟64 bit so的东西，都想预制进入可以采用：

## libutopia.so
##==============================================================================
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE_SUFFIX := .so
LOCAL_MODULE := libutopia
LOCAL_MODULE_CLASS := SHARED_LIBRARIES

LOCAL_SRC_FILES_arm :=lib/libutopia.so
LOCAL_SRC_FILES_arm64 :=lib64/libutopia.so
LOCAL_MODULE_TARGET_ARCHS:= arm arm64
LOCAL_MULTILIB := both

include $(BUILD_PREBUILT)
   
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---

如果只预制32 bit的so

## libutopia.so
##==============================================================================
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE_SUFFIX := .so
LOCAL_MODULE := libutopia
LOCAL_MODULE_CLASS := SHARED_LIBRARIES
LOCAL_SRC_FILES_arm :=lib/libutopia.so

LOCAL_MODULE_TARGET_ARCHS:= arm
LOCAL_MULTILIB := 32

include $(BUILD_PREBUILT)
   
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---

如果只想预制64 bit的so

## libutopia.so
##==============================================================================
include $(CLEAR_VARS)
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE_SUFFIX := .so
LOCAL_MODULE := libutopia
LOCAL_MODULE_CLASS := SHARED_LIBRARIES
LOCAL_SRC_FILES_arm64 :=lib64/libutopia.so

LOCAL_MODULE_TARGET_ARCHS:= arm64
LOCAL_MULTILIB := 64


include $(BUILD_PREBUILT)
   
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---

预置 apk，请参考下面的写法预置 apk 
1，预置system app下的apk

define PREBUILT_system_apps_template
 include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := $(1)
 LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
 LOCAL_MODULE_CLASS := APPS
 LOCAL_CERTIFICATE := platform
 LOCAL_SRC_FILES := $$(LOCAL_MODULE)$(COMMON_ANDROID_PACKAGE_SUFFIX)
 include $(BUILD_PREBUILT)
endef
   
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---

2，预置system下的apk， force apk 跑 32 bit， libbluetooth_jni部分是一个32 bit的lib

define PREBUILT_system_apps_template_32only
 include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := $(1)
 LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
 LOCAL_MODULE_CLASS := APPS
 LOCAL_CERTIFICATE := platform
 LOCAL_SRC_FILES := $$(LOCAL_MODULE)$(COMMON_ANDROID_PACKAGE_SUFFIX)

 LOCAL_MULTILIB := 32

 LOCAL_JNI_SHARED_LIBRARIES := libbluetooth_jni
 include $(BUILD_PREBUILT)
endef
   
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---

3，预置system app， 不用系统签名， 用预签名

definePREBUILT_system_apps_template_32only_presigned
 include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := $(1)
 LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
 LOCAL_MODULE_CLASS := APPS
 LOCAL_CERTIFICATE := PRESIGNED

 LOCAL_MULTILIB := 32

 LOCAL_JNI_SHARED_LIBRARIES := libbluetooth_jni
 include $(BUILD_PREBUILT)
endef
   
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---

4，预置system vendor apk

define PREBUILT_vendor_apps_template
 include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := $(1)
 LOCAL_MODULE_CLASS := APPS

 LOCAL_MODULE_PATH:= $(TARGET_OUT)/vendor/app

 LOCAL_CERTIFICATE := platform
 LOCAL_SRC_FILES := $(1).apk
 include $(BUILD_PREBUILT)
endef
   
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---

5，预置system vendor apk， 并force 32 bit

define PREBUILT_vendor_apps_template_32only
 include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := $(1)
 LOCAL_MODULE_CLASS := APPS

 LOCAL_MODULE_PATH := $(TARGET_OUT)/vendor/app

 LOCAL_CERTIFICATE := platform
 LOCAL_SRC_FILES := $(1).apk

 LOCAL_MULTILIB := 32

 LOCAL_JNI_SHARED_LIBRARIES := libbluetooth_jni
 include $(BUILD_PREBUILT)
endef
   
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---

6，预置data app下的apk，使用系统签名

define PREBUILT_data_apps_template
 include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := $(1)
 LOCAL_MODULE_CLASS := APPS
 LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_APPS)
 LOCAL_CERTIFICATE := platform
 LOCAL_SRC_FILES := $(1).apk
 include $(BUILD_PREBUILT)
endef
   
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---

7，预置data app下的apk，使用预签名

definePREBUILT_data_apps_presigned_template
 include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := $(1)
 LOCAL_MODULE_CLASS := APPS
 LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_APPS)
 LOCAL_CERTIFICATE := PRESIGNED
 LOCAL_SRC_FILES := $(1).apk
 include $(BUILD_PREBUILT)
endef
   
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---

LOCAL_MODULE_TARGET_ARCH 
设置成一个架构的列表，只有被构建的架构在列表中才会被构建系统添加进入当前模块。 
LOCAL_MODULE_UNSUPPORTED_TARGET_ARCH 
LOCAL_MODULE_TARGET_ARCH 的对立选项。 
只有被构建的架构不在列表中才会被构建系统添加进入当前模块。

DEX预选择 
LOCAL_MULTILIB := both 
为APK预置32位和64位的odex ;

参考：http://blog.youkuaiyun.com/le_773/article/details/51714986