Android Studio CMake Error: Build Command failed

I would recommend using GCC instead of clang for the time being because clang still does not contain all features. You can change your compiler by doing the following:

set(CMAKE_C_COMPILER /path-to-ndk/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-gcc)

However, the darwin-x86_64 directory only exists if you are on a Mac. If you are on another platform, just use the directory that exists under the prebuilt folder.

Build -> Refresh Linked C++ Projects resolved this error for me.

I found this Solution Online and this worked, however there was no explanation on how it worked: Remove the following block of code from you build.gradle file:

externalNativeBuild {
    cmake {
        path "src/main/cpp/CMakeLists.txt"
    }
}

@rpurohit was nearly right, Clang isn't working properly. But to change the Compiler you need to change build.gradle, in my build.gradle it was Line 12:

apply plugin: 'com.android.application'

1 android {
2    compileSdkVersion 25
3    buildToolsVersion '25.0.2'
4    defaultConfig {
5       applicationId 'com.example.hellojni'
6       minSdkVersion 23
7       targetSdkVersion 25
8       versionCode 1
9       versionName "1.0"
10      externalNativeBuild {
11          cmake {
12              arguments '-DANDROID_TOOLCHAIN=clang' --> gcc
            }
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "src/main/cpp/CMakeLists.txt"
        }
    }
    productFlavors {
        arm7 {
            // in the future, ndk.abiFilter might also work
            ndk {
                abiFilter 'armeabi-v7a'
            }
        }
        arm8 {
            ndk {
                abiFilters 'arm64-v8a'
            }
        }
        arm {
            ndk {
                abiFilter 'armeabi'
            }
        }
        x86 {
            ndk {
                abiFilter 'x86'
            }
        }
        x86_64 {
            ndk {
                abiFilter 'x86_64'
            }
        }
        mips {
            ndk {
                abiFilters 'mips', 'mips64'
            }
        }
        universal {
            ndk {
                abiFilters 'mips', 'mips64', 'x86', 'x86_64'
            }
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:25.2.0'
    compile 'com.android.support.constraint:constraint-layout:1.0.1'
}