Android 开发基础知识

核心提示：LOCAL_MODULE := hellosLOCAL_STATIC_LIBRARIES := libhellosLOCAL_SHARED_LIBRARIES :=LOCAL_LDLIBS += -ldlLOCAL_CFLAGS := $(L_CFLAGS)LOCAL_SRC_FILES := mains.cLOCAL

LOCAL_MODULE := hellos

LOCAL_STATIC_LIBRARIES := libhellos

LOCAL_SHARED_LIBRARIES :=

LOCAL_LDLIBS += -ldl

LOCAL_CFLAGS := $(L_CFLAGS)

LOCAL_SRC_FILES := mains.c

LOCAL_C_INCLUDES := $(INCLUDES)

include $(BUILD_EXECUTABLE)

#使用动态库

include $(CLEAR_VARS)

LOCAL_MODULE := hellod

LOCAL_MODULE_TAGS := debug

LOCAL_SHARED_LIBRARIES := libc libcutils libhellod

LOCAL_LDLIBS += -ldl

LOCAL_CFLAGS := $(L_CFLAGS)

LOCAL_SRC_FILES := maind.c

LOCAL_C_INCLUDES := $(INCLUDES)

include $(BUILD_EXECUTABLE)

endif # ifeq ($(WPA_BUILD_SUPPLICANT),true)

########################

#local_target_dir := $(TARGET_OUT)/etc/wifi

#include $(CLEAR_VARS)

#LOCAL_MODULE := wpa_supplicant.conf

#LOCAL_MODULE_TAGS := user

#LOCAL_MODULE_CLASS := ETC

#LOCAL_MODULE_PATH := $(local_target_dir)

#LOCAL_SRC_FILES := $(LOCAL_MODULE)

#include $(BUILD_PREBUILT)

########################

系统变量解析

LOCAL_MODULE - 编译的目标对象

LOCAL_SRC_FILES - 编译的源文件

LOCAL_C_INCLUDES - 需要包含的头文件目录

LOCAL_SHARED_LIBRARIES - 链接时需要的外部库

LOCAL_PRELINK_MODULE - 是否需要prelink处理

BUILD_SHARED_LIBRARY - 指明要编译成动态库

LOCAL_PATH - 编译时的目录

$(call 目录，目录….) 目录引入操作符

如该目录下有个文件夹名称 src，则可以这样写 $(call src)，那么就会得到 src 目录的完整路径

include $(CLEAR_VARS) -清除之前的一些系统变量

CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk

在 build/core/config.mk 定义 CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk

通过include 包含自定义的.mk文件(即是自定义编译规则)或是引用系统其他的.mk文件(系统定义的编译规则)。