Bazel: `--fat_apk_cpu` doesn't pack multi-arch libraries from aar_import targets

[jin]

If an aar contains .so files for multiple architectures (e.g. foo and bar), and an android_binary depends on this aar, --fat_apk_cpu=foo,bar doesn't pack both so files into the final APK correctly.

The current behavior only packs the .so for one target configuration into the APK.

[MarcoSavaglia]

In preparing for the new 64 bit support requirment incoming for August 1st https://developer.android.com/distribute/best-practices/develop/64-bit

I have come across this issue as well. Is there a recommended workaround? Right now our best option seems to be to generate both versions separately, merge them and sign the resulting APK.

[i-mann]

Hi, my team has also found this issue. Is there any plan to address this soon/before the August 1st cut off?

[jin]

Bumping this up due to the hard requirement on apps depending on multi-arch splits over 32 and 64 bit native libs.

[jin]

WIP fix: https://github.com/bazelbuild/bazel/pull/8510

Using https://github.com/jin/repro/tree/master/8283 as repro:

$ bazel-dev build --fat_apk_cpu=armeabi-v7a,x86 :app && zipinfo bazel-bin/app.apk
INFO: Analyzed target //:app (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //:app up-to-date:
  bazel-bin/app_deploy.jar
  bazel-bin/app_unsigned.apk
  bazel-bin/app.apk
INFO: Elapsed time: 0.222s, Critical Path: 0.00s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
Archive:  bazel-bin/app.apk
Zip file size: 475815 bytes, number of entries: 10
-rw----     2.0 fat        9 b- stor 10-Jan-01 00:00 nativedeps
-rw----     2.0 fat    21792 b- defN 10-Jan-01 00:00 lib/armeabi-v7a/libapp.so
-rw----     2.0 fat     6424 b- defN 10-Jan-01 00:00 lib/x86/libapp.so
-rw----     2.0 fat      920 bl defN 10-Jan-01 00:00 classes.dex
-rw-rw-rw-  2.3 unx     1168 b- defX 10-Jan-01 00:00 AndroidManifest.xml
?rw-------  2.0 unx   184888 b- stor 10-Jan-01 00:00 lib/armeabi-v7a/libenvoy_aar_jni.so
?rw-------  2.0 unx   268104 b- stor 10-Jan-01 00:00 lib/x86/libenvoy_aar_jni.so
-rw----     2.0 fat      648 b- defN 10-Jan-01 00:00 META-INF/CERT.SF
-rw----     2.0 fat     1203 b- defN 10-Jan-01 00:00 META-INF/CERT.RSA
-rw----     2.0 fat      563 b- defN 10-Jan-01 00:00 META-INF/MANIFEST.MF

[jin]

The fix will be in 0.27.

[keith]

Thanks @jin!