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Re: Building on android....

From: Jordan Schidlowsky
Subject: Re: Building on android....
Date: Wed, 13 Feb 2019 08:57:41 -0600

I also wouldn't try building for anything below android 21, bionic has a bunch of stuff thats missing in libc and libc++ and you have to also link in libandroid_support for those api levels.  From the NDK changelog:

  • libandroid_support is no longer used when your NDK API level is greater than or equal to 21 (Lollipop). Build system maintainers: be sure to update your build systems to account for this.
  • The platform static libraries (libc.a, libm.a, etc.) have been updated.
    • All NDK platforms now contain a modern version of these static libraries. Previously they were all Gingerbread (perhaps even older) or Lollipop.
    • Prior NDKs could not use the static libraries with a modern NDK API level because of symbol collisions between libc.a and libandroid_support. This has been solved by removing libandroid_support for modern API levels. A side effect of this is that you must now target at least android-21 to use the static libraries, but these binaries will still work on older devices.

  • On Feb 13, 2019, at 8:41 AM, Jordan Schidlowsky <address@hidden> wrote:

    An NDK app can chose to bundle in a (c++_shared) library in your app, or you can link with a static (c++_static) standard library.   This is actually dependant on what setting you chose for this in your gradle build file, as gradle will pass that along to cmake which will link it in.  

    That cxx runtime test doesn't quite work correctly using an android toolchain.  But if you want to configure your ndk app using c++_static you can remove that test section from CMakeLists.txt and add in manually below:

    set(CXXRT_IS_STDLIB true)
    target_link_libraries(objc c++_static stdc++)

    I will also note, that I am still thinking about a way to run that test suite while cross compiling...     

    On Feb 13, 2019, at 6:41 AM, Gregory Casamento <address@hidden> wrote:

    A little more context...  my build environment is a MacPro 2010 running the latest version of Mojave.  I have downloaded and installed the latest of Android studio and installed the latest SDK and NDK using the menu under tools and the SDK manager.  The version of the NDK I'm using is 19.0.5232133.   I am utterly stumped as to why this is not working.  Also, it seems as though Ivan's installation of this is working which seems to indicate that this is a configuration issue.

    Any input would be appreciated.

    On Wed, Feb 13, 2019 at 7:09 AM Gregory Casamento <address@hidden> wrote:
    ### Build libobjc2
    -- The ASM compiler identification is Clang
    -- Found assembler: /Users/heron/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang
    -- Check for working C compiler: /Users/heron/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang
    -- Check for working C compiler: /Users/heron/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang -- works
    -- Detecting C compiler ABI info
    -- Detecting C compiler ABI info - done
    -- Detecting C compile features
    -- Detecting C compile features - done
    -- Check for working CXX compiler: /Users/heron/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++
    -- Check for working CXX compiler: /Users/heron/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ -- works
    -- Detecting CXX compiler ABI info
    -- Detecting CXX compiler ABI info - done
    -- Detecting CXX compile features
    -- Detecting CXX compile features - done
    -- Testing C++ interop
    -- Testing C++ standard library
    -- No useable C++ runtime found
    -- Looking for pthread.h
    -- Looking for pthread.h - found
    -- Looking for pthread_create
    -- Looking for pthread_create - found
    -- Found Threads: TRUE  
    -- GNUstep install type set to NONE
    -- Configuring done
    -- Generating done
    -- Build files have been written to: /Users/heron/Development/Algoriddim/gnustep-toolchain/gnustep-android/gnustep/libobjc2/build
    [1/1] Linking CXX executable test_cxx_runtime
    FAILED: test_cxx_runtime 
    : && /Users/heron/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang++ --target=armv7-none-linux-androideabi16 --gcc-toolchain=/Users/heron/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64  --sysroot /Users/heron/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/sysroot -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mfpu=vfpv3-d16 -fno-addrsig -mthumb -Wa,--noexecstack -Wformat -Werror=format-security -stdlib=libc++  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--warn-shared-textrel  -Wl,--exclude-libs,libunwind.a -Wl,--no-undefined -Qunused-arguments -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -Wl,--gc-sections CMakeFiles/test_cxx_runtime.dir/  -o test_cxx_runtime  -latomic -lm && :
    CMakeFiles/test_cxx_runtime.dir/ for type_info2: error: undefined reference to 'std::type_info::__do_upcast(__cxxabiv1::__class_type_info const*, void**) const'
    clang++: error: linker command failed with exit code 1 (use -v to see invocation)
    ninja: build stopped: subcommand failed.

    I am running into the above error when trying to build for Android.  I have the latest ndk and sdk installed with Android studio.  Does anyone have any idea offhand why C++ isn't finding it's runtime?   I will attach the build script I am using to generate the ninja script....


    Gregory Casamento
    GNUstep Lead Developer / OLC, Principal Consultant -

    Gregory Casamento
    GNUstep Lead Developer / OLC, Principal Consultant -
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