CMAKE不遵守gradle关于Android上NDK构建的标志

我有一个Android NDK项目，我正试图通过Gradle+CMake来构建它

build.gradle:

apply plugin: 'com.android.library'

allprojects {
    repositories {
        jcenter()
        google()
    }
}

android {
    compileSdkVersion 27
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11"
                arguments "-DANDROID_ABI=armeabi-v7a",
                          "-DANDROID_PLATFORM=android-16",
                          "-DANDROID_STL=gnustl_static",
                          "-DANDROID_CPP_FEATURES=rtti exceptions",
                          "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=libs"
            }
        }
    }

    buildTypes {
        release {
            ndk {
                abiFilters "armeabi-v7a"
            }
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            ndk {
                abiFilters "armeabi-v7a"
            }
        }
    }
    externalNativeBuild {
        cmake {
            path 'CMakeLists.txt'
        }
    }
}

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

Executable : /Users/ssk/Library/Android/sdk/cmake/3.6.3155560/bin/cmake
arguments : 
-H/Users/ssk/MyProject
-B/Users/ssk/MyProject/.externalNativeBuild/cmake/debug/armeabi-v7a
-DANDROID_ABI=armeabi-v7a
-DANDROID_PLATFORM=android-16
------> -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/Users/ssk/MyProject/build/intermediates/cmake/debug/obj/armeabi-v7a
-DCMAKE_BUILD_TYPE=Debug
-DANDROID_NDK=/Users/ssk/Library/Android/sdk/ndk-bundle
-DCMAKE_CXX_FLAGS=-std=c++11
-DCMAKE_TOOLCHAIN_FILE=/Users/ssk/Library/Android/sdk/ndk-bundle/build/cmake/android.toolchain.cmake
-DCMAKE_MAKE_PROGRAM=/Users/ssk/Library/Android/sdk/cmake/3.6.3155560/bin/ninja
-GAndroid Gradle - Ninja
-DANDROID_STL=gnustl_static
-DANDROID_ABI=armeabi-v7a
-DANDROID_PLATFORM=android-16
-DANDROID_CPP_FEATURES=rtti exceptions
------> -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=libs
jvmArgs : 

CMAKE命令输出：

apply plugin: 'com.android.library'

allprojects {
    repositories {
        jcenter()
        google()
    }
}

android {
    compileSdkVersion 27
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11"
                arguments "-DANDROID_ABI=armeabi-v7a",
                          "-DANDROID_PLATFORM=android-16",
                          "-DANDROID_STL=gnustl_static",
                          "-DANDROID_CPP_FEATURES=rtti exceptions",
                          "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=libs"
            }
        }
    }

    buildTypes {
        release {
            ndk {
                abiFilters "armeabi-v7a"
            }
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            ndk {
                abiFilters "armeabi-v7a"
            }
        }
    }
    externalNativeBuild {
        cmake {
            path 'CMakeLists.txt'
        }
    }
}

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

Executable : /Users/ssk/Library/Android/sdk/cmake/3.6.3155560/bin/cmake
arguments : 
-H/Users/ssk/MyProject
-B/Users/ssk/MyProject/.externalNativeBuild/cmake/debug/armeabi-v7a
-DANDROID_ABI=armeabi-v7a
-DANDROID_PLATFORM=android-16
------> -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/Users/ssk/MyProject/build/intermediates/cmake/debug/obj/armeabi-v7a
-DCMAKE_BUILD_TYPE=Debug
-DANDROID_NDK=/Users/ssk/Library/Android/sdk/ndk-bundle
-DCMAKE_CXX_FLAGS=-std=c++11
-DCMAKE_TOOLCHAIN_FILE=/Users/ssk/Library/Android/sdk/ndk-bundle/build/cmake/android.toolchain.cmake
-DCMAKE_MAKE_PROGRAM=/Users/ssk/Library/Android/sdk/cmake/3.6.3155560/bin/ninja
-GAndroid Gradle - Ninja
-DANDROID_STL=gnustl_static
-DANDROID_ABI=armeabi-v7a
-DANDROID_PLATFORM=android-16
-DANDROID_CPP_FEATURES=rtti exceptions
------> -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=libs
jvmArgs : 

我正在尝试使用

DCMAKE\u LIBRARY\u output\u directory

配置输出目录，但它没有遵守

Gradle在我的选项前面加上一个默认前缀，作为高亮显示（------>在cmake命令输出中）

问题：

---

我应该如何配置输出目录？

您可能需要设置buildStagingDirectory选项。在下一个链接中，您将了解如何在gradle中管理CMake的路径：

作为与问题无关的旁注。在gradle脚本中，您似乎仍在使用不再受支持的gnustl_static，它将在下一个NDK版本中删除。您应该切换到c++\u static或c++\u shared。考虑到gcc已被弃用，您应该使用clang。下面是一个例子：

externalNativeBuild {
            cmake {
                arguments "-DANDROID_PLATFORM=android-16", "-DANDROID_STL=c++_static", "-DANDROID_TOOLCHAIN=clang"
                abiFilters "armeabi-v7a", "arm64-v8a", "x86"
            }
        }

---

下面的代码段将配置您的输出目录：

对于staticlib输出目录，请尝试以下操作：

# copy out the static lib binary 
set_target_properties(${STATIC_LIBRARY_NAME}
                      PROPERTIES
                      ARCHIVE_OUTPUT_DIRECTORY "libs/${ANDROID_ABI}")

# copy out the shared lib binary 
set_target_properties(${SHARED_LIBRARY_NAME}
                      PROPERTIES
                      LIBRARY_OUTPUT_DIRECTORY "libs/${ANDROID_ABI}")

对于共享的库输出目录，请尝试以下操作：

# copy out the static lib binary 
set_target_properties(${STATIC_LIBRARY_NAME}
                      PROPERTIES
                      ARCHIVE_OUTPUT_DIRECTORY "libs/${ANDROID_ABI}")

# copy out the shared lib binary 
set_target_properties(${SHARED_LIBRARY_NAME}
                      PROPERTIES
                      LIBRARY_OUTPUT_DIRECTORY "libs/${ANDROID_ABI}")

说明：

ANDROID_ABI

是定义ANDROID ABI的变量，例如

armeabi-v7a

关于CMake变量定义的参考：

apply plugin: 'com.android.library'

allprojects {
    repositories {
        jcenter()
        google()
    }
}

android {
    compileSdkVersion 27
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11"
                arguments "-DANDROID_ABI=armeabi-v7a",
                          "-DANDROID_PLATFORM=android-16",
                          "-DANDROID_STL=gnustl_static",
                          "-DANDROID_CPP_FEATURES=rtti exceptions",
                          "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=libs"
            }
        }
    }

    buildTypes {
        release {
            ndk {
                abiFilters "armeabi-v7a"
            }
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            ndk {
                abiFilters "armeabi-v7a"
            }
        }
    }
    externalNativeBuild {
        cmake {
            path 'CMakeLists.txt'
        }
    }
}

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

Executable : /Users/ssk/Library/Android/sdk/cmake/3.6.3155560/bin/cmake
arguments : 
-H/Users/ssk/MyProject
-B/Users/ssk/MyProject/.externalNativeBuild/cmake/debug/armeabi-v7a
-DANDROID_ABI=armeabi-v7a
-DANDROID_PLATFORM=android-16
------> -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/Users/ssk/MyProject/build/intermediates/cmake/debug/obj/armeabi-v7a
-DCMAKE_BUILD_TYPE=Debug
-DANDROID_NDK=/Users/ssk/Library/Android/sdk/ndk-bundle
-DCMAKE_CXX_FLAGS=-std=c++11
-DCMAKE_TOOLCHAIN_FILE=/Users/ssk/Library/Android/sdk/ndk-bundle/build/cmake/android.toolchain.cmake
-DCMAKE_MAKE_PROGRAM=/Users/ssk/Library/Android/sdk/cmake/3.6.3155560/bin/ninja
-GAndroid Gradle - Ninja
-DANDROID_STL=gnustl_static
-DANDROID_ABI=armeabi-v7a
-DANDROID_PLATFORM=android-16
-DANDROID_CPP_FEATURES=rtti exceptions
------> -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=libs
jvmArgs : 

---

只是要指出使用DANDROID_平台不好，minSdkVersion应该是管理平台版本的正确方法，请参阅此处的更多详细信息“您应该在

模块级build.gradle

文件的

defaultConfig

或

productFlavors

块中设置

minSdkVersion

属性，而不是直接更改此标志。”。这将确保您的库仅由安装在运行适当版本Android的设备上的应用程序使用。“这就是为什么。”。如果ABI存在等于minSdkVersion的平台版本，CMake将使用该版本。2.否则，如果ABI存在低于minSdkVersion的平台版本，CMake将使用这些平台版本中最高的版本。这是一个合理的选择，因为缺少平台版本通常意味着自上一个可用版本以来，本机平台API没有任何更改。3.否则，CMake将使用比minSdkVersion更高的下一个可用平台版本。”