On Monday, December 5, 2016 at 7:44:23 AM UTC+1, andrey mirtchovski wrote:
>
> I'm having issues with the latest gomobile + reverse java bindings. I
> have a piece of code that linked with a C library via CGO. Previously
> (around 6 months ago) everything appeared file: cross compile library
> with NDK toolchain (gcc), link against go code with cgo, run "gomobile
> bind -target=android" and everything worked.
>
> now it appears gomobile has switched to targeting arm64 with clang. I
> tried compiling my code against 32-bit gcc, 32-bit clang, and 64-bit
> clang. even though i can create a successful 32-bit arm binary with
> the standard Go tools, I am unable to create one with gomobile. here's
> an example of the 32-bit library I'm using (i've also compiled it
> static):
>
> /opt/arm-linux-androideabi/sysroot/usr/lib/mylibrary.so: ELF 32-bit
> LSB shared object, ARM, version 1 (SYSV), dynamically linked (uses
> shared libs), not stripped
>
> gradle build however invokes gomobile bind thusly (major parts of the
> classpaths stripped):
>
>
> --------8<----------------
> /.../gomobile bind -i -classpath
> /.../android/android/build/intermediates/exploded-aar/com.android.support/appcompat-v7/24.2.1/jars/classes.jar:[...]:/.../android/android/build/intermediates/classes/debug
>
>
> -o
> /var/folders/sp/06p28g2d0vs7gd2vhf26wl9m0000gn/T/gobind-2223404674934856774.aar
>
>
> -target android -bootclasspath
> /.../sdk/platforms/android-24/android.jar -x my/project
>
> gomobile then issues this command and receives the following error:
>
> /Users/aam/pkg/gomobile/android-ndk-r12b/arm64/bin/aarch64-linux-android-clang
>
>
> -I . -fPIC -pthread -fno-caret-diagnostics -Qunused-arguments
> -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build
> -gno-record-gcc-switches -o $WORK/my/project/_obj/_cgo_.o ...-target
> aarch64-none-linux-android --sysroot
> /.../pkg/gomobile/android-ndk-r12b/arm64/sysroot
> /opt/arm-linux-androideabi/sysroot/usr/lib/mylibrary.a -lm -lz -pie
>
> # my/project
>
> /opt/arm-linux-androideabi/sysroot/usr/lib/mylibrary.a: error adding
> symbols: File in wrong format
>
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
> --------8<----------------
>
> again, this works when using GOOS=arm GOARCH=android CGO_ENABLED=1 go
> build... also, the reverse example works fine with this setup, but
> that doesn't attempt any cgo tomfoolery.
>
> TL;DR: i'm unable to figure out a way to force 32-bit gomobile
> compilation, especially while staring from outside the "gradle build"
> wall.
>
The gradle plugin supports the GOARCH settings which contains a list of the
architectures you want to include. Use it in your gobind {...} section of
your build.gradle, along with your "pkg" setting:
apply plugin: "org.golang.mobile.bind"
gobind {
pkg = "...golang.org/x/mobile/example/bind/hello"
GOARCH = "arm"
}
- elias
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