workaround for x86_64-android

[JssDWt]

A workaround that fixes breez/c-breez#553
Recommended by @yukibtc here breez/c-breez#553 (comment)

Flutter uses sdk-core for Android, that's why this build script is put in sdk-core. It may be necessary to put it in sdk-bindings as well, for bindings for other languages that work on android, not sure.

Did a testrun with a breez-sdk-flutter release from the CI: https://github.com/breez/breez-sdk/suites/16489120334/artifacts/942132999
The testrun worked.

[dangeross]

Looks good. Did you test the android build CI? I think it may apply to the android bindings build also

[JssDWt]

I think it may apply to the android bindings build also

I was thinking it might propagate to the sdk-bindings build, because sdk-bindings uses sdk-core. Let's add this into sdk-bindings when someone runs into the same error there.

[erdemyerebasmaz]

I think it may apply to the android bindings build also

I was thinking it might propagate to the sdk-bindings build, because sdk-bindings uses sdk-core. Let's add this into sdk-bindings when someone runs into the same error there.

@ademar111190 Could you help us with this by running the Android example app you've created recently on a x86_64 emulator?
If it reproduces, please apply these changes to sdk-bindings/build.rs and test again to see if it resolves the issue. This requires NDK 23+ as it stopped distributing libgcc, which is the root cause of this issue.

[ademar111190]

@erdemyerebasmaz yeap the error is happening; I'll try later the fix.

FATAL EXCEPTION: main
    Process: sample.sdk.breez, PID: 6184
    java.lang.UnsatisfiedLinkError: Unable to load library 'breez_sdk_bindings':
    dlopen failed: cannot locate symbol "__extenddftf2" referenced by "/data/app/~~LcWXJgm1fr3Ygm6vj7JORg==/sample.sdk.breez-sMERZDRzjZ5zbpgovkHKdQ==/lib/x86_64/libbreez_sdk_bindings.so"...
    dlopen failed: cannot locate symbol "__extenddftf2" referenced by "/data/app/~~LcWXJgm1fr3Ygm6vj7JORg==/sample.sdk.breez-sMERZDRzjZ5zbpgovkHKdQ==/lib/x86_64/libbreez_sdk_bindings.so"...
    dlopen failed: cannot locate symbol "__extenddftf2" referenced by "/data/app/~~LcWXJgm1fr3Ygm6vj7JORg==/sample.sdk.breez-sMERZDRzjZ5zbpgovkHKdQ==/lib/x86_64/libbreez_sdk_bindings.so"...
    Native library (android-x86-64/libbreez_sdk_bindings.so) not found in resource path (.)
    	at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:301)

[JssDWt]

I tried a build for sdk-flutter where flutter uses sdk-bindings instead of sdk-core on an x86_64 emulator, and it worked. So the sdk-core change also propagates to sdk-bindings.

[JssDWt]

As discussed with @erdemyerebasmaz, these changes should be put in sdk-bindings/build.rs, rather than sdk-core/build.rs. This should be possible after we have merged #480