深海游弋的鱼 – 第 4 页

Overriding a default option(…) value in CMake from a parent CMakeLists.txt

子 CMakeLists.txt

option(BUILD_FOR_ANDROID "Build For Android" OFF)

if(SYSTEM.Android AND NOT BUILD_FOR_ANDROID)
    set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${NATIVE_LIBRARY_OUTPUT}/${ANDROID_ABI})
endif()

option(BUILD_FOR_ANDROID "Build For Android" OFF)

if(SYSTEM.Android AND NOT BUILD_FOR_ANDROID)

set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${NATIVE_LIBRARY_OUTPUT}/${ANDROID_ABI})

endif()

父 CMakeLists.txt

set(BUILD_FOR_ANDROID ON)
add_subdirectory(${CHILD_ROOT_DIR}/ ${CMAKE_CURRENT_SOURCE_DIR}/build)

1 2	set(BUILD_FOR_ANDROID ON) add_subdirectory(${CHILD_ROOT_DIR}/ ${CMAKE_CURRENT_SOURCE_DIR}/build)

执行如下命令的时候：

/Users/xxxx/Library/Android/sdk/cmake/3.6.4111459/bin/cmake --trace-expand \
-H/Users/xxxx/Source/example/demo/android/app \
-B/Users/xxxx/Source/example/demo/android/app/.externalNativeBuild/cmake/debug/arm64-v8a \
-DANDROID_ABI=arm64-v8a \
-DANDROID_PLATFORM=android-21 \
-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/Users/xxxx/Source/example/demo/android/app/build/intermediates/cmake/debug/obj/arm64-v8a \
-DCMAKE_BUILD_TYPE=Debug \
-DANDROID_NDK=/Users/xxxx/Library/Android/android-ndk-r16b \
-DCMAKE_TOOLCHAIN_FILE=/Users/xxxx/Library/Android/android-ndk-r16b/build/cmake/android.toolchain.cmake \
-DCMAKE_MAKE_PROGRAM=/Users/xxxx/Library/Android/sdk/cmake/3.6.4111459/bin/ninja \
-G"Android Gradle - Ninja" \
-DANDROID_ARM_NEON=TRUE \
-DANDROID_TOOLCHAIN=gcc \
-DANDROID_PLATFORM=android-21 \
-DANDROID_STL=gnustl_shared

/Users/xxxx/Library/Android/sdk/cmake/3.6.4111459/bin/cmake --trace-expand \

-H/Users/xxxx/Source/example/demo/android/app \

-B/Users/xxxx/Source/example/demo/android/app/.externalNativeBuild/cmake/debug/arm64-v8a \

-DANDROID_ABI=arm64-v8a \

-DANDROID_PLATFORM=android-21 \

-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/Users/xxxx/Source/example/demo/android/app/build/intermediates/cmake/debug/obj/arm64-v8a \

-DCMAKE_BUILD_TYPE=Debug \

-DANDROID_NDK=/Users/xxxx/Library/Android/android-ndk-r16b \

-DCMAKE_TOOLCHAIN_FILE=/Users/xxxx/Library/Android/android-ndk-r16b/build/cmake/android.toolchain.cmake \

-DCMAKE_MAKE_PROGRAM=/Users/xxxx/Library/Android/sdk/cmake/3.6.4111459/bin/ninja \

-G"Android Gradle - Ninja" \

-DANDROID_ARM_NEON=TRUE \

-DANDROID_TOOLCHAIN=gcc \

-DANDROID_PLATFORM=android-21 \

-DANDROID_STL=gnustl_shared

会观察到生成的配置文件中 BUILD_FOR_ANDROID 不一定能生效。

需要如下配置才行：
父 CMakeLists.txt

set(BUILD_FOR_ANDROID ON CACHE BOOL "" FORCE)
add_subdirectory(${CHILD_ROOT_DIR}/ ${CMAKE_CURRENT_SOURCE_DIR}/build)

1 2	set(BUILD_FOR_ANDROID ON CACHE BOOL "" FORCE) add_subdirectory(${CHILD_ROOT_DIR}/ ${CMAKE_CURRENT_SOURCE_DIR}/build)

参考链接

Use ccache with CMake for faster compilation

C and C++ compilers aren’t the fastest pieces of software out there and there’s no lack of programmer jokes based on tedium of waiting for their work to complete.

There are ways to fix the pain though - one of them is ccache. CCache improves compilation times by caching previously built object files in private cache and reusing them when you’re recompiling same objects with same parameters. Obviously it will not help if you’re compiling the code for the first time and it also won’t help if you often change compilation flags. Most C/C++ development however involves recompiling same object files with the same parameters and ccache helps alot.

For illustration, here’s the comparison of first and subsequent compilation times of a largish C++ project:

Original run with empty cache:

$ make -j9
...
real    0m56.684s
user    5m31.996s
sys     0m41.638s

$ make -j9

...

real 0m56.684s

user 5m31.996s

sys 0m41.638s

Recompilation with warm cache:

$ make -j9
...
real    0m5.929s
user    0m11.896s
sys     0m8.722s

$ make -j9

...

real 0m5.929s

user 0m11.896s

sys 0m8.722s

Installation

CCache is available in repositories on pretty much all distributions. On OS X use homebrew:

$ brew install ccache

1	$ brew install ccache

and on Debian-based distros use apt:

$ apt-get install ccache

1	$ apt-get install ccache

CMake configuration

After ccache is installed, you need to tell CMake to use it as a wrapper for the compiler. Add these lines to your CMakeLists.txt:

# Configure CCache if available
find_program(CCACHE_FOUND ccache)
if(CCACHE_FOUND)
        set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
        set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
endif(CCACHE_FOUND)

# Configure CCache if available

find_program(CCACHE_FOUND ccache)

if(CCACHE_FOUND)

set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)

set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)

endif(CCACHE_FOUND)

Rerun cmake and next make should use ccache for wrapper.

Usage with Android NDK

CCache can even be used on Android NDK - you just need to export NDK_CCACHE environment variable with path to ccache binary. ndk-build script will automatically use it. E.g.

$ export NDK_CCACHE=/usr/local/bin/ccache

$ ndk-build -j9

$ export NDK_CCACHE=/usr/local/bin/ccache

$ ndk-build -j9

(Note that on Debian/Ubuntu the path will probably be /usr/bin/ccache)

CCache statistics

To see if ccache is really working, you can use ccache -s command, which will display ccache statistics:

cache directory                     /Users/jernej/.ccache
primary config                      /Users/jernej/.ccache/ccache.conf
secondary config      (readonly)    /usr/local/Cellar/ccache/3.2.2/etc/ccache.conf
cache hit (direct)                 77826
cache hit (preprocessed)           17603
cache miss                         46999
called for link                       18
compile failed                        45
ccache internal error                  1
preprocessor error                    62
unsupported source language          204
files in cache                     48189
cache size                           1.2 GB
max cache size                      20.0 GB

cache directory /Users/jernej/.ccache

primary config /Users/jernej/.ccache/ccache.conf

secondary config (readonly) /usr/local/Cellar/ccache/3.2.2/etc/ccache.conf

cache hit (direct) 77826

cache hit (preprocessed) 17603

cache miss 46999

called for link 18

compile failed 45

ccache internal error 1

preprocessor error 62

unsupported source language 204

files in cache 48189

cache size 1.2 GB

max cache size 20.0 GB

On second and all subsequent compilations the “cache hit” values should increase and thus show that ccache is working.

参考链接

Use ccache with CMake for faster compilation

macOS Mojave (10.14.3) Android Studio 3.3.1 NDK 19.1.5304403 导入并构建Vuh项目

以前在 Android Studio 3.2.1上vuh库使用的例子中实现了一个使用 vuh 库的例子。那个例子中的 vuh 库是我们编译好 libvuh.so 之后直接引用的，我们下面实现通过直接编译代码实现整合。

尝试过使用 ExternalProject_add 跟 include 的方式包含 vuh 库，但是都不是很成功。

其中 ExternalProject_add 导入的项目只能编译一次，即使指定 BUILD_ALWAYS 1 也没用，这个应该是 Ninja 导致的问题，导致当出现多个 ABI 或者 vuh 库代码变动之后，不能重新编译，出现各种编译错误。

使用 include 包含的项目会导致路径信息不正确，无法找到源代码文件。

最后使用 add_subdirectory实现。

修改之后的几个关键文件如下：

注意： VUH_ROOT_DIR 这个变量中指定 vuh 库代码的位置

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.8)

# for Vulkan
SET(Vulkan_INCLUDE_DIR ${ANDROID_NDK}/sources/third_party/vulkan/src/include/)
SET(Vulkan_LIBRARIES ${ANDROID_NDK}/platforms/${ANDROID_PLATFORM}/arch-${ANDROID_ARCH_NAME}/usr/lib)
if(X86_64)
    SET(Vulkan_LIBRARIES ${Vulkan_LIBRARIES}64)
endif()
SET(Vulkan_LIBRARIES ${Vulkan_LIBRARIES}/libvulkan.so)
add_library(vulkan SHARED IMPORTED)
set_target_properties(vulkan PROPERTIES IMPORTED_LOCATION ${Vulkan_LIBRARIES})

# for vuh
add_definitions(-DVK_USE_PLATFORM_ANDROID_KHR=1 -DVULKAN_HPP_TYPESAFE_CONVERSION=1)
SET(VUH_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../vuh/)
SET(VUH_BUILD_TESTS OFF)
SET(VUH_BUILD_DOCS OFF)
SET(VUH_BUILD_EXAMPLES OFF)

add_subdirectory(${VUH_ROOT_DIR}src/ ${CMAKE_CURRENT_SOURCE_DIR}/build/)

# for example
SET(Vuh_INCLUDE_PATH ${VUH_ROOT_DIR}src/include)
include_directories(${Vulkan_INCLUDE_DIR})
include_directories(${Vuh_INCLUDE_PATH})

# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.
        native-lib

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        src/main/cpp/native-lib.cpp)


add_dependencies(native-lib vuh)

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
        log-lib

        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log

        android)

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
        native-lib

        vulkan

        vuh

        ${log-lib})

# For more information about using CMake with Android Studio, read the

# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.8)

# for Vulkan

SET(Vulkan_INCLUDE_DIR ${ANDROID_NDK}/sources/third_party/vulkan/src/include/)

SET(Vulkan_LIBRARIES ${ANDROID_NDK}/platforms/${ANDROID_PLATFORM}/arch-${ANDROID_ARCH_NAME}/usr/lib)

if(X86_64)

SET(Vulkan_LIBRARIES ${Vulkan_LIBRARIES}64)

endif()

SET(Vulkan_LIBRARIES ${Vulkan_LIBRARIES}/libvulkan.so)

add_library(vulkan SHARED IMPORTED)

set_target_properties(vulkan PROPERTIES IMPORTED_LOCATION ${Vulkan_LIBRARIES})

# for vuh

add_definitions(-DVK_USE_PLATFORM_ANDROID_KHR=1 -DVULKAN_HPP_TYPESAFE_CONVERSION=1)

SET(VUH_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../vuh/)

SET(VUH_BUILD_TESTS OFF)

SET(VUH_BUILD_DOCS OFF)

SET(VUH_BUILD_EXAMPLES OFF)

add_subdirectory(${VUH_ROOT_DIR}src/ ${CMAKE_CURRENT_SOURCE_DIR}/build/)

# for example

SET(Vuh_INCLUDE_PATH ${VUH_ROOT_DIR}src/include)

include_directories(${Vulkan_INCLUDE_DIR})

include_directories(${Vuh_INCLUDE_PATH})

# Creates and names a library, sets it as either STATIC

# or SHARED, and provides the relative paths to its source code.

# You can define multiple libraries, and CMake builds them for you.

# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.

native-lib

# Sets the library as a shared library.

SHARED

# Provides a relative path to your source file(s).

src/main/cpp/native-lib.cpp)

add_dependencies(native-lib vuh)

# Searches for a specified prebuilt library and stores the path as a

# variable. Because CMake includes system libraries in the search path by

# default, you only need to specify the name of the public NDK library

# you want to add. CMake verifies that the library exists before

# completing its build.

find_library( # Sets the name of the path variable.

log-lib

# Specifies the name of the NDK library that

# you want CMake to locate.

log

android)

# Specifies libraries CMake should link to your target library. You

# can link multiple libraries, such as libraries you define in this

# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.

native-lib

vulkan

vuh

${log-lib})

注意：由于 vuh 库需要 CMake 3.8 。因此，我们需要手工指定CMake版本为3.10.2 。

如下：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.mobibrw.vuhandroid"
        minSdkVersion 24
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                version "3.10.2"
                cppFlags "-std=c++14 -v -g"
            }
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            version "3.10.2"
            path "CMakeLists.txt"
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

apply plugin: 'com.android.application'

android {

compileSdkVersion 28

defaultConfig {

applicationId "com.mobibrw.vuhandroid"

minSdkVersion 24

targetSdkVersion 28

versionCode 1

versionName "1.0"

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

externalNativeBuild {

cmake {

version "3.10.2"

cppFlags "-std=c++14 -v -g"

}

buildTypes {

release {

minifyEnabled false

proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

}

externalNativeBuild {

cmake {

version "3.10.2"

path "CMakeLists.txt"

}

dependencies {

implementation fileTree(dir: 'libs', include: ['*.jar'])

implementation 'com.android.support:appcompat-v7:28.0.0'

implementation 'com.android.support.constraint:constraint-layout:1.1.3'

testImplementation 'junit:junit:4.12'

androidTestImplementation 'com.android.support.test:runner:1.0.2'

androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

}

如果出现如下错误：

CMake Error: CMake was unable to find a build program corresponding to "Ninja".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
-- Configuring incomplete, errors occurred!

1 2	CMake Error: CMake was unable to find a build program corresponding to "Ninja". CMAKE_MAKE_PROGRAM is not set. You probably need to select a different build tool. -- Configuring incomplete, errors occurred!

则执行如下操作：

$ brew install ninja

1	$ brew install ninja

如果出现如下错误：

* What went wrong:
Execution failed for task ':app:transformNativeLibsWithMergeJniLibsForDebug'.
> More than one file was found with OS independent path 'lib/armeabi-v7a/libvuh.so'

* What went wrong:

Execution failed for task ':app:transformNativeLibsWithMergeJniLibsForDebug'.

> More than one file was found with OS independent path 'lib/armeabi-v7a/libvuh.so'

则删除代码中的 jniLibs/armeabi-v7a/libvuh.so 即可解决问题。

完整的例子点击此处下载 vuhAndroid

参考链接

macOS Mojave (10.14.3) Android Studio 3.3.1 指定使用CMake 3.10.2版本

目前最新版本的 Android Studio 3.3.1默认使用CMake 3.6版本，但是已经支持 CMake 3.10.2 版本了。

新版本的 CMake 3.10.2 新增了 FindVulkan.cmake 等一系列的改进，对于很多项目来说，会更友好。

目前默认依旧使用 CMake 3.6 版本，但是可以手工指定使用 CMake 3.10.2。

继续阅读macOS Mojave (10.14.3) Android Studio 3.3.1 指定使用CMake 3.10.2版本

错误程序包org.apache.http.conn.util不存在

开发的时候遇到了这个问题，记录下下次就知道了。这个是因为在 sdk22 以后的版本不在支持了！！！

程序包 org.apache.http.conn.util 不存在，然后搜索了下，在 app 的 build.gradle 文件中加上useLibrary 'org.apache.http.legacy' 就可以了。

如下：

android {
    compileSdkVersion 23
    buildToolsVersion '23.0.3'

    useLibrary 'org.apache.http.legacy'

    defaultConfig {
        applicationId "com.ah.woyi"
        minSdkVersion 14
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
}

android {

compileSdkVersion 23

buildToolsVersion '23.0.3'

useLibrary 'org.apache.http.legacy'

defaultConfig {

applicationId "com.ah.woyi"

minSdkVersion 14

targetSdkVersion 21

versionCode 1

versionName "1.0"

}

参考链接

错误程序包org.apache.http.conn.util不存在

Android Studio 3.2.1上vuh库使用的例子

Android Studio 3.2.1 上 vuh 库使用的例子，首先使用基于Vulkan的GPGPU计算框架Vuh 编译出 Android 版本的动态库，然后依照如下步骤建立工程。

继续阅读Android Studio 3.2.1上vuh库使用的例子

Android Studio 3.2.1编译Vulkan示例项目

最近在学习Vulkan,根据Google官方给出的文档，是存在一些问题的，总结一下：

# 官方文档说要检出 git clone https://github.com/googlesamples/vulkan-basic-samples.git
# 实际上 vulkan-basic-samples.git 是 VulkanSamples.git 的一个fork，google简化了部分编译流程
# vulkan-basic-samples.git检出后，直接用 Android Studio打开即可
# https://github.com/SaschaWillems/Vulkan.git也存在一个例子工程
# 但是貌似根正苗红的是VulkanSamples这个例子

$ git clone https://github.com/LunarG/VulkanSamples.git

$ cd VulkanSamples

$ cd API-Samples

# 最后在当前目录下生成一个 android 的目录，用Android Studio导入这个目录下的工程
# 也就是 "VulkanSamples⁩/API-Samples⁩/android⁩" 这个目录是我们的工程目录
$ cmake -DANDROID=ON -DABI_NAME=armeabi-v7a

# 官方文档说要检出 git clone https://github.com/googlesamples/vulkan-basic-samples.git

# 实际上 vulkan-basic-samples.git 是 VulkanSamples.git 的一个fork，google简化了部分编译流程

# vulkan-basic-samples.git检出后，直接用 Android Studio打开即可

# https://github.com/SaschaWillems/Vulkan.git也存在一个例子工程

# 但是貌似根正苗红的是VulkanSamples这个例子

$ git clone https://github.com/LunarG/VulkanSamples.git

$ cd VulkanSamples

$ cd API-Samples

# 最后在当前目录下生成一个 android 的目录，用Android Studio导入这个目录下的工程

# 也就是 "VulkanSamples⁩/API-Samples⁩/android⁩" 这个目录是我们的工程目录

$ cmake -DANDROID=ON -DABI_NAME=armeabi-v7a

如果代码下载不成功，可以本站下载一份拷贝。点击这里下载 VulkanSamples vulkan-basic-samples
继续阅读

解决Android Studio 3.2.1中NDK编译代码时候出现警告": warning: conflicts with previous declaration here [-Wattributes]"

在使用Android Studio 3.2.1 结合 NDK r16/r18编译代码时候出现如下警告：

<built-in>: In function 'float abs(float)':
<built-in>: warning: conflicts with previous declaration here [-Wattributes]

1 2	<built-in>: In function 'float abs(float)': <built-in>: warning: conflicts with previous declaration here [-Wattributes]

关键是出现警告的代码文件中并不一定存在abs函数的调用。

这个警告产生的条件是在编译器中指定了STL，并且指定编译器为GCC，调用的源代码文件中恰好有STL的代码。

类似如下：

externalNativeBuild {
    cmake {
        cppFlags "-DANDROID_ARM_NEON=TRUE", "-DANDROID_TOOLCHAIN=gcc", "-DANDROID_PLATFORM=android-21", "-DANDROID_STL=c++_static"
        abiFilters 'armeabi-v7a'
    }
}

externalNativeBuild {

cmake {

cppFlags "-DANDROID_ARM_NEON=TRUE", "-DANDROID_TOOLCHAIN=gcc", "-DANDROID_PLATFORM=android-21", "-DANDROID_STL=c++_static"

abiFilters 'armeabi-v7a'

}

原因在于新版本的NDK r16/r18中，对于GCC部分的适配已经不是非常完善了，已经逐步迁移到CLANG(LLVM)了。导致STL进行编译的时候，会出现一些警告信息。这个警告信息是STL库的警告信息，跟我们自己的代码没有关系。

只需要指定 "-DANDROID_TOOLCHAIN=clang" 即可解决这个问题。

参考链接

NDK r13, -fexceptions -Wall --> warning: conflicts with previous declaration

Android Studio 3.2.1解决错误信息"No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android"

在用Android Studio 3.2.1导入以前的项目，进行编译的时候，报告如下错误信息：

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

CONFIGURE FAILED in 5s
No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

FAILURE: Build failed with an exception.

* What went wrong:

A problem occurred configuring project ':app'.

> No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

CONFIGURE FAILED in 5s

No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android

这个错误信息的原因是从NDK r17版本开始，已经不支持"armeabi、mips、mips64"这三种ABI格式了，而当前机器上安装的NDK版本是NDK r17之后的版本。

不过这个提示很能迷惑人，会让人误以为自己的build.gradle中配置了MIPS的ABI。实际上根本没有配置，是低版本的构建工具自己在默认构建MIPS格式，而又找不到对应的工具链。

解决方法很简单，要么使用低于NDK r17的NDK版本，要么修改主工程的build.gradle,找到如下

// Top-level build file where you can add configuration options common to all sub-projects/modules.
configure(allprojects) {
    buildscript {
        repositories {
		    google()
            jcenter()
        }
        dependencies {
            classpath 'com.android.tools.build:gradle:3.0.0'
        }
    }

    repositories {
          jcenter()
    }
}

// Top-level build file where you can add configuration options common to all sub-projects/modules.

configure(allprojects) {

buildscript {

repositories {

google()

jcenter()

}

dependencies {

classpath 'com.android.tools.build:gradle:3.0.0'

}

repositories {

jcenter()

}

将其中的

classpath 'com.android.tools.build:gradle:3.0.0'

1	classpath 'com.android.tools.build:gradle:3.0.0'

修改成

classpath 'com.android.tools.build:gradle:3.2.1'

1	classpath 'com.android.tools.build:gradle:3.2.1'

高版本的构建工具，才能适配高版本的NDK。

参考链接

"No toolchains found in the NDK toolchains folder for ABI with prefix: mips64el-linux-android"

Android Studio 3.2.1解决错误信息"ABIs [armeabi] are not supported for platform. Supported ABIs are [arm64-v8a, armeabi-v7a, x86, x86_64]."

在用Android Studio 3.2.1导入以前的项目，进行编译的时候，报告如下错误信息：

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> ABIs [armeabi] are not supported for platform. Supported ABIs are [arm64-v8a, armeabi-v7a, x86, x86_64].

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 0s

FAILURE: Build failed with an exception.

* What went wrong:

A problem occurred configuring project ':app'.

> ABIs [armeabi] are not supported for platform. Supported ABIs are [arm64-v8a, armeabi-v7a, x86, x86_64].

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 0s

问题发生的原因在于以前的代码在build.gradle中指定了abiFilters 'armeabi',但是从NDK r17版本开始，已经不支持"armeabi、mips、mips64"这三种ABI了。

虽然可以简单的修改成abiFilters 'armeabi-v7a'，来解决问题，但是我们更希望能有一个办法，在老版本的支持abiFilters 'armeabi'的NDK上继续使用abiFilters 'armeabi'进行编译，用来兼容老设备。而在只支持abiFilters 'armeabi-v7a'的设备上，我们使用abiFilters 'armeabi-v7a'保证能编译通过。

我们通过执行NDK目录下的ndk-which输出的支持的ABI列表的方式获取当前的NDK是否支持abiFilters 'armeabi'，如果不支持，我们就设置为abiFilters 'armeabi-v7a'。

继续阅读Android Studio 3.2.1解决错误信息"ABIs [armeabi] are not supported for platform. Supported ABIs are [arm64-v8a, armeabi-v7a, x86, x86_64]."

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