Android Gradle NDK: Linking prebuilt static library

[Nimrod Dayan]

In traditional NDK make file, I can link a prebuilt static library and specify its headers directory:
Android.mk

include $(CLEAR_VARS)
LOCAL_MODULE            := somelibrary-prebuilt-static
LOCAL_SRC_FILES         := $(TARGET_ARCH_ABI)/libsomelibrary.a
LOCAL_EXPORT_C_INCLUDES := include 
include $(PREBUILT_STATIC_LIBRARY)

How do I do that in build.gradle using the new plugin's DSL?

[Streets Of Boston]

From here: http://tools.android.com/tech-docs/new-build-system/gradle-experimental

"No support for creating and depending on static libraries"

[Emanuele Zattin]

Is this going to be supported eventually?

[Iliya]

I second that. This is the last thing that is keeping us from using Android Studio and Eclipse is starting to get on my nerves more and more with all the new features available in AS :)

[Johan Euphrosine]

You can link to a prebuild static library with the `ldFlags` option introduced in gradle-experimental:0.2.0.

I just published a sample to show how it works (with the google play services library: that ship as a set of .a for each platform):

https://github.com/googlesamples/android-ndk/tree/master/hello-thirdparty

Let me know if that helps.

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[Iliya]

Still seem to be getting the same undefined reference errors as before even with the flags set:

def libPath = "src/main/jni/src/cocos2d/cocos2dx/platform/third_party/android/prebuilt/"

create("arm7") {

    ndk.abiFilters += "armeabi-v7a"

    ndk.ldFlags += "-L${file(libPath+"libcurl/libs/armeabi-v7a")}".toString()

    ndk.ldFlags += "-L${file(libPath+"libjpeg/libs/armeabi-v7a")}".toString()

    ndk.ldFlags += "-L${file(libPath+"libpng/libs/armeabi-v7a")}".toString()

    ndk.ldFlags += "-L${file(libPath+"libtiff/libs/armeabi-v7a")}".toString()

    ndk.ldFlags += "-L${file(libPath+"libwebp/libs/armeabi-v7a")}".toString()

}

Error:(66) undefined reference to 'png_get_io_ptr'

Error:(75) undefined reference to 'png_error'

also tried to specify the full path to the files directly with the same error:

create("arm7") {

    ndk.abiFilters += "armeabi-v7a"

    ndk.ldFlags += "-L${file(libPath+"libcurl/libs/armeabi-v7a/libcurl.a")}".toString()

    ndk.ldFlags += "-L${file(libPath+"libjpeg/libs/armeabi-v7a/libjpeg.a")}".toString()

    ndk.ldFlags += "-L${file(libPath+"libpng/libs/armeabi-v7a/libpng.a")}".toString()

    ndk.ldFlags += "-L${file(libPath+"libtiff/libs/armeabi-v7a/libtiff.a")}".toString()

    ndk.ldFlags += "-L${file(libPath+"libwebp/libs/armeabi-v7a/libwebp.a")}".toString()

[Johan Euphrosine]

Can you try `ldFlags+="-Lpath/to/lib/foo/directory"` in combinaison with `ldLibs+=["foo"]`.

See:

https://github.com/googlesamples/android-ndk/blob/ece572d7219eafcfef928748eadfa10ceb23d2d4/hello-thirdparty/app/build.gradle#L24

https://github.com/googlesamples/android-ndk/blob/ece572d7219eafcfef928748eadfa10ceb23d2d4/hello-thirdparty/app/build.gradle#L36

[Iliya]

tried this using the same lib names that are used in the makefiles for jenkins and getting a different error now:

Error:error: cannot find -llibpng_static

...

Will try some more playing around with the configs some more

[Johan Euphrosine]

Hi Iliya, did you end up solving your issue?

As an alternative we could move the question to http://stackoverflow.com/questions/tagged/android-ndk that way it's easier for other to find the answer.

[Iliya]

Yeah thanks! After some tinkering got it all set up and working. compiling, running, debugging all seem good :)

[tresalmasenmimente1]

Hey hows it going Iliya?  I am having the same issues linking the static libraries with this new plugins.  I am using the ldFlags and ldLibs but I cannot figure it out.  If you could show me how you did it would be much appreciated, I really need to figure it out.

Thank you from NMSU,

Slowhand

[Iliya]

Sure here is the snippet from the gradle.build file that I am using:

    android.ndk {

        moduleName = "TestProject"

        // Generic stuff

        cppFlags += "-O2"

        cppFlags += "-std=gnu++11"

        cppFlags += "-frtti"

        cppFlags += "-fexceptions"

        cppFlags += "-fpermissive"

        cppFlags += "-DANDROID"

        

        def jniPath = "src/main/jni"

        cppFlags += "-I${file(jniPath)}".toString()

        file(jniPath).eachDirRecurse { dir ->

            cppFlags += "-I${file(dir)}".toString()

        }

        CFlags += cppFlags

        ldLibs += ["android", "EGL","GLESv2", "dl", "log", "jpeg", "png", "tiff", "z"]

        stl = "c++_static"

    }

    android.buildTypes {

        release {

            minifyEnabled = false

            proguardFiles += file('proguard-rules.txt')

        }

    }

    android.productFlavors {

        def libPath = "src/main/jni/prebuilt/"

        create("arm7") {

            ndk.abiFilters += "armeabi-v7a"

            ndk.ldFlags += "-L${file(libPath+"libjpeg/libs/armeabi-v7a/")}".toString()

            ndk.ldFlags += "-L${file(libPath+"libpng/libs/armeabi-v7a/")}".toString()

            ndk.ldFlags += "-L${file(libPath+"libtiff/libs/armeabi-v7a/")}".toString()

        }

        create("arm") {

            ndk.abiFilters += "armeabi"

            ndk.ldFlags += "-L${file(libPath+"libjpeg/libs/armeabi/")}".toString()

            ndk.ldFlags += "-L${file(libPath+"libpng/libs/armeabi/")}".toString()

            ndk.ldFlags += "-L${file(libPath+"libtiff/libs/armeabi/")}".toString()

        }

        create("x86-32") {

            ndk.abiFilters += "x86"

            ndk.ldFlags += "-L${file(libPath+"libjpeg/libs/x86")}".toString()

            ndk.ldFlags += "-L${file(libPath+"libpng/libs/x86")}".toString()

            ndk.ldFlags += "-L${file(libPath+"libtiff/libs/x86")}".toString()

        }

        create("fat")

    }

Main issue I was running into is that in our old makefiles we actually had to add in the libraries by specifying "libtiff", "libpng", etc. here after linking the actual lib paths it just had to be "tiff", "png", etc. without "lib" prepended.

[Alex Cohn]

Please check the hybrid Android.mk + grade plugin approach as demonstrated for define LOCAL_SRC_FILES in ndk{} DSL.

Cheers,

Alex

[Igor Ganapolsky]

That repo doesn't even exist anymore.  Are you sure it is current?

[Igor Ganapolsky]

If you are using gradle-experimental:0.7.0, you would do this in the model.repositories.libs block.  Like this:

model {

    repositories {

        libs(PrebuiltLibraries) {

            // These are akin to LOCAL_SRC_FILES in the old Android.mk

           

           somelibrary_prebuilt {

               binaries.withType(StaticLibraryBinary) {

                   staticLibraryFile = file("${TARGET_ARCH_ABI}/libsomelibrary.a")

        }

      }

    }

  }

}   

On Monday, July 13, 2015 at 9:53:29 PM UTC-4, Nimrod Dayan wrote:

[Igor Ganapolsky]

What about in gradle-experimental:0.8.0-alpha7?