System Android.bp cannot link vendor library

[Dimitrije Petrovic]

Greetings,

I have a vendor library (let's call it mylib), located under vendor/ and to be Treble compliant it should be on the vendor partition.

It was previously built using Android.mk and this library was used by system/vold. Now as vold was migrated to Android.bp I migrated my library as well, so that vold can use it (as .bp files cannot use .mk files).

This solution worked fine until I realised that mylib is built under $OUT/system/lib/. I tried resolving this by adding:

vendor: true,

under the Android.bp file.

This is when these problems occured:

error: system/vold/Android.bp:89:1: dependency "mylib" of "libvold" missing variant:
  arch:android_arm_armv7-a-neon_cortex-a15, image:core, link:shared
available variants:
  arch:android_arm_armv7-a-neon_cortex-a15, image:vendor, link:shared
error: system/vold/tests/Android.bp:1:1: dependency "mylib" of "vold_tests" missing variant:
  arch:android_arm_armv7-a-neon_cortex-a15, image:core, link:shared
available variants:
  arch:android_arm_armv7-a-neon_cortex-a15, image:vendor, link:shared
error: system/vold/Android.bp:150:1: dependency "mylib" of "vold" missing variant:
  arch:android_arm_armv7-a-neon_cortex-a15, image:core, link:shared
available variants:
  arch:android_arm_armv7-a-neon_cortex-a15, image:vendor, link:shared

As I understand the problem here is that system binaries and libraries cannot link vendor libraries.

Can someone propose a solution to this problem? And I must add that this was working until vold was migrated to Android.bp-soong build (Android O to Android P migration in my case).

[vincent becker]

Hi,

Correct, system libraries cannot link to vendor librairies, it is well described here : https://source.android.com/devices/architecture/vndk/build-system

Since Android O, the system checks dependencies of this type between modules. You could try to set vendor_available flag, or keep your library system (vendor:false) but you would not be Treble compliant anymore unless you hack the SEpolicy.

Cheers,

[Zoltan Kuscsik]

You should create an HIDL interface for your library or open it as a module.

//Z

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