LOCAL_C_INCLUDES := $(LOCAL_PATH)/../include \ $(LOCAL_PATH)/../include/json 是什么意思
时间: 2023-12-20 18:06:28 浏览: 24
这是一个 Android.mk 文件中的配置项,用于指定需要包含的头文件路径。其中,LOCAL_C_INCLUDES 是一个变量,其值为本地路径和 ../include 目录下的头文件路径,其中也包括一个名为 json 的子目录。这样编译时就可以找到并包含相关头文件,以便正确地使用相关函数和数据结构。
相关问题
翻译一下下面这个Android.mk每个字段的含义:LOCAL_PATH := $(call my-dir) # Build vlogtest # ============================================================================================================ include $(CLEAR_VARS) LOCAL_MODULE := vlogtest LOCAL_MODULE_TAGS := optional LOCAL_MODULE_PATH := $(TARGET_OUT)/lib64 LOCAL_MULTILIB := 64 LOCAL_SDK_VERSION := current LOCAL_NDK_STL_VARIANT := c++_shared LOCAL_CPPFLAGS := -O3 -fexceptions -frtti LOCAL_C_INCLUDES := \ $(LOCAL_PATH) \ $(LOCAL_PATH)/libyuv/include \ $(LOCAL_PATH)/../opencv-4.6.0-android-sdk/sdk/native/jni/include
这段代码是一个 Android NDK 的 Makefile,它用于构建一个名为 vlogtest 的模块。每个字段的含义如下:
- LOCAL_PATH:指定当前 Makefile 所在目录的路径。
- include $(CLEAR_VARS):清空之前定义的变量,以准备定义新的变量。
- LOCAL_MODULE:指定当前模块的名称,即 vlogtest。
- LOCAL_MODULE_TAGS:指定模块的标签,这里是 optional。
- LOCAL_MODULE_PATH:指定构建生成的二进制文件输出路径,这里是 $(TARGET_OUT)/lib64。
- LOCAL_MULTILIB:指定生成的二进制文件类型,这里是 64 位。
- LOCAL_SDK_VERSION:指定该模块的最低 API 版本,这里是当前版本。
- LOCAL_NDK_STL_VARIANT:指定该模块所使用的 STL 库的类型,这里是 c++_shared。
- LOCAL_CPPFLAGS:指定 C++ 编译器需要使用的编译选项,这里是 -O3(启用最高级别的优化)、-fexceptions(启用异常)、-frtti(启用运行时类型信息)。
- LOCAL_C_INCLUDES:指定 C/C++ 头文件的搜索路径,这里包括当前目录、libyuv 库的 include 目录和 OpenCV 的 include 目录。
LOCAL_PREBUILT_JNI_LIBS:
LOCAL_PREBUILT_JNI_LIBS is a variable used in Android.mk files to specify pre-built JNI libraries that are needed by the project. JNI (Java Native Interface) is a programming framework that enables Java code to call and be called by native applications or libraries written in C or C++.
When building an Android app that uses native code, the NDK (Native Development Kit) is used to compile the C/C++ code into a native library that can be accessed by the Java code through JNI. However, sometimes it's necessary to include pre-built native libraries that were compiled outside of the Android build system.
In such cases, the LOCAL_PREBUILT_JNI_LIBS variable is used to specify the path to the pre-built libraries and their associated header files, if any. The variable is typically defined in the Android.mk file of the module that requires the pre-built libraries.
For example, to include a pre-built library named libfoo.so located in the /path/to/libfoo directory, the following lines would be added to the Android.mk file:
```
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := foo
LOCAL_SRC_FILES := libfoo.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_SHARED_LIBRARY)
```
Here, the LOCAL_MODULE variable specifies the name of the module that will be built, LOCAL_SRC_FILES specifies the name of the pre-built library file, and LOCAL_EXPORT_C_INCLUDES specifies the path to any header files needed by the library.
The include $(PREBUILT_SHARED_LIBRARY) line tells the build system to include the pre-built library in the module being built.
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![7z](https://img-home.csdnimg.cn/images/20210720083312.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)