Parallel NDK build in Android Studio

[Davy Wentzler]

Hi guys,

After a long time, I decided to give Android Studio a go. I have been using Eclipse until now with ndk-build called separately using a cygwin terminal. I use the parallel build option, 'ndk-build -j6' for example, which gives a huge compilation speed boost on my Core i7 6700K system. I could not find an option for that in Android studio. After Googling around, I found people mentioning to use the 'arguments' option, but that was for early version it seems since that just gives an error.

Is there any way to call ndk-build with the -j argument?

[javacom]

Have you tried to put "-j6" in the arguments property of ndkBuild block ?

http://google.github.io/android-gradle-dsl/current/com.android.build.gradle.internal.dsl.ExternalNativeNdkBuildOptions.html#com.android.build.gradle.internal.dsl.ExternalNativeNdkBuildOptions:arguments

Regards

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[Davy Wentzler]

I tried:

externalNativeBuild {
    ndkBuild {
        path 'src/main/jni/Android.mk'
        arguments "-j6"
    }

}

Gradle sync failed: Could not find method arguments() for arguments [-j6] on object of type com.android.build.gradle.internal.dsl.NdkBuildOptions.

[javacom]

I think you should try it in

defaultConfig {

     applicationId "....."

     ....

     externalNativeBuild {
            ndkBuild {

                    arguments "-j6"

not the ndkBuild with path ...

Regards

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[Iliya Koreshev]

Here is what I have in the native build block for AS 2.3 and it seems to work fine (one difference I see is that I define the arguments inside the defaultConfig block and not the one outside of that block, not sure if that makes a difference:

    defaultConfig {
        applicationId "com.my.app"
        minSdkVersion minSdk
        targetSdkVersion 25
        versionCode 1
        versionName "0.0.1"
        multiDexEnabled true

        externalNativeBuild {
            ndkBuild {
                targets "ndkTarget"

                arguments "NDK_MODULE_PATH:=../../../libs",
                        "NDK_TOOLCHAIN_VERSION:=clang",
                        "-j6",
                        "-d",
                        "APP_SHORT_COMMANDS=true",
                        'NDK_DEBUG=1'
            }
        }
    }

    externalNativeBuild {
        ndkBuild {
            path 'src/main/jni/Android.mk'
        }
    }

[Davy Wentzler]

Thanks! That seems to have worked.

I see it builds both debug and release, whereas the ndk-build I used from cygwin only did one of them (probably release since my Application.mk contained an APP_OPTIM:= release option). Is this done to be able to debug native code and can I disable one or the other to speed up things even more?

[Gerry Fan]

I use command line to do specific build:

   gradlew assembleDebug

   gradlew assembleRelease

   gradlew assemble ( it does both release and debug, I think )

Inside Android Studio IDE, I mostly build debug with "Build Variants":

  inside IDE, left bottom edge ( menu on left side edge ), click on "Build Variants", choose "Debug"

[mike digioia]

what is the benefit to doing this?

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