更改 ndk-build 输出位置 [英] Change ndk-build output locations

问题描述

我的应用程序具有以下结构

My app has the following structure

Android
|
|-> app
|    |
|    |-> build [1]
|    |-> src
|    |    |-> main
|    |    |     |-> assets
|    |    |     |-> java
|    |    |     |-> jni 
|    |    |     |     |-> Android.mk
|    |    |     |     |-> Application.mk
|    |    |     |
|    |    |     |-> jniLibs
|    |    |     |      |-> armeabi
|    |    |     |      |-> armeabi-v7a
|    |    |     |
|    |    |     |-> res
|    |    |     |-> AndroidManifest.xml
|
|-> build [2]

我正在 Linux 机器上使用 ndk-build 命令构建我的 .so 库.我像这样使用它:

I am building my .so libraries with ndk-build command in a linux machine. I use it like:

<my_ndk_path>/ndk-build -C <my_project_path>/Android/app/src/main/

构建过程工作正常，生成的输出文件没有错误.

The build process works fine and output files are produced with no errors.

我的问题是结果文件没有指向正确的位置"

My problem is that the result files are not "directed to the proper position"

libs 生成于:

.app/src/main/libs/armeabi-v7a/libMyGeneratedLibrary.so
.app/src/main/libs/armeabi/libMyGeneratedLibrary.so

和 obj 文件位于:

.app/src/main/obj/local/armeabi-v7a/libMyGeneratedLibrary.so
.app/src/main/obj/local/armeabi/libMyGeneratedLibrary.so

我希望在不同位置生成输出:

I would like the output to produced in different locations:

1. jniLibs 中的 libs.IE../app/src/main/jniLibs/armeabi*
2. 构建文件夹之一下的 obj.IE.build[1] 或 build[2].

1. The libs at jniLibs. ie. ./app/src/main/jniLibs/armeabi*
2. The obj under one of the build folders. ie. build[1] or build[2].

是否有任何可能的方法可以通过将某些参数更改为 .mk 文件或构建命令来实现?

Is there any possible way to achieve that by changing some parameter to the .mk files or to the build command?

编辑

TARGET_OUT 在 NDK r6b 中似乎不起作用

TARGET_OUT does not seem to work in NDK r6b

执行命令ndk-build -C Android/app/src/main/TARGET_OUT='Android/app/src/main/jniLibs/$(TARGET_ARCH_ABI)'

每个生成的文件都会出现如下警告.

Warnings as the following appear for each generated file.

android-ndk-r6b/build/core/build-binary.mk:217: warning: overriding commands for target 'Android/app/src/main/jniLibs//objs/***/****.o'
android-ndk-r6b/build/core/build-binary.mk:217: warning: ignoring old commands for target 'Android/app/src/main/jniLibs//objs/***/****.o'

推荐答案

编辑(适用于使用较新 NDK 版本涉足此主题的任何人):

Edit (for anyone that step on this topic with newer NDK versions):

• 使用 NDK_LIBS_OUT 更改库输出(需要 NDK r9 及更高版本)
• 使用NDK_OUT改变obj输出(需要NDK r7c及以上)

• Use NDK_LIBS_OUT to change libs output (requires NDK r9 and above)
• Use NDK_OUT to change obj output (requires NDK r7c and above)

构建命令是:

ndk-build NDK_LIBS_OUT=./jniLibs NDK_OUT=./obj

---

上一个答案(适用于任何情况):

我是怎么解决的.不是很优雅，但至少它有效.

How I solve it. Not really elegant but at least it works.

因为我的构建机制非常复杂，所以我也有几个自定义的 gradle 任务和脚本，所以构建的单个命令对我来说并不重要.

Because my building mechanism is quite complicated so I had a couple of custom gradle tasks and scripts too, it doesn't really matter to me the single command for the build.

所以我按原样保留了构建命令

So I kept build command as is

<my_ndk_path>/ndk-build -C <my_project_path>/Android/app/src/main/

添加文件夹创建(-p 如果存在则不产生错误)

Add a the folder creation (-p don't generate error if it exists)

mkdir -p <my_project_path>/Android/app/src/main/jniLibs/

然后我使用同步命令将 .so 文件移动到最终位置.

Then I move the .so files to the final location with the sync command.

rsync -avh --remove-source-files                        \
      <my_project_path>/Android/app/src/main/libs/*     \
      <my_project_path>/Android/app/src/main/jniLibs/

您可以对 obj 文件夹执行类似的操作.我刚刚修改了我的 .gitignore，所以我保持原样.

You can do something similar for the obj folder. I just modified my .gitignore so I left it as is.

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