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. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
