How to fix library variant issues?

Question

I have my own C library (libmylibrary) which I want to use in healthd.

Adding libmylibrary as a dependency of healthd results in the following errors:

FAILED: out/soong/build.ninja
out/soong/.bootstrap/bin/soong_build -t -l out/.module_paths/Android.bp.list -b out/soong -n out -d out/soong/build.ninja.d -globFile out/soong/.bootstrap/build-globs.ninja -o out/soong/build.ninja Android.bp
error: hardware/interfaces/health/2.0/default/Android.bp:52:1: dependency "libmylibrary" of "[email protected]" missing variant:
  arch:android_arm64_armv8-a_cortex-a53, image:recovery, link:shared
available variants:
  arch:android_arm64_armv8-a_cortex-a53, image:core, link:shared, version:
  arch:android_arm_armv7-a-neon_cortex-a9, image:core, link:shared, version:
error: hardware/interfaces/health/2.0/default/Android.bp:32:1: dependency "libmylibrary" of "[email protected]" missing variant:
  arch:android_arm64_armv8-a_cortex-a53, image:vendor, link:shared, version:
available variants:
  arch:android_arm64_armv8-a_cortex-a53, image:core, link:shared, version:
  arch:android_arm_armv7-a-neon_cortex-a9, image:core, link:shared, version:
14:35:38 soong bootstrap failed with: exit status 1

I can confirm that libmylibrary exists on the target, it's just when I add it as healthd dependency that I get errors.

$ find . -name "libmylibrary*"
./obj_arm/SHARED_LIBRARIES/libmylibrary_intermediates
./obj_arm/SHARED_LIBRARIES/libmylibrary_intermediates/mylibrary.so
./system/lib/libmylibrary.so
./system/lib64/libmylibrary.so
./symbols/system/lib/libmylibrary.so
./symbols/system/lib64/libmylibrary.so
./obj/SHARED_LIBRARIES/libmylibrary_intermediates
./obj/SHARED_LIBRARIES/libmylibrary_intermediates/libmylibrary.so

What are these variants and how can I fix these errors?

Answer 1

The solution was to add vendor_available and recovery_available settings to the library's Android.bp:

cc_library {
    name: "libmylibrary",

    vendor_available: true,
    recovery_available: true,

    srcs: [
        "src/chain.c",
        "src/fcs.c",
    ],

    cflags: ["-Wall", "-Werror"],

    export_include_dirs: ["include"],

    sdk_version: "14",
}