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Merge #17365: depends: update README.md with working Android targets and API levels

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3fe1aba601 depends: move README.md Android instructions to a separate section (Igor Cota)
aa9b84acee depends: update README.md with working Android targets and API levels (Igor Cota)

Pull request description:

  Per @Sjors comments in https://github.com/bitcoin/bitcoin/pull/16110#pullrequestreview-310821810

ACKs for top commit:
  Sjors:
    ACK 3fe1aba

Tree-SHA512: 7a2e676070d51c7a4291b0d4b638f52321c08cc6ebe2bd2c02ba62f6cc3dd8a73227df4693c6ce9201863eb0bf26e0133805347b9016cb0f9a389a49cc9492aa
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MarcoFalke 2019-11-05 09:42:52 -05:00
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@ -30,17 +30,12 @@ Common `host-platform-triplets` for cross compilation are:
- `aarch64-linux-gnu` for Linux ARM 64 bit - `aarch64-linux-gnu` for Linux ARM 64 bit
- `riscv32-linux-gnu` for Linux RISC-V 32 bit - `riscv32-linux-gnu` for Linux RISC-V 32 bit
- `riscv64-linux-gnu` for Linux RISC-V 64 bit - `riscv64-linux-gnu` for Linux RISC-V 64 bit
- `armv7a-linux-android` for Android ARM 32 bit
- `aarch64-linux-android` for Android ARM 64 bit - `aarch64-linux-android` for Android ARM 64 bit
- `i686-linux-android` for Android x86 32 bit
- `x86_64-linux-android` for Android x86 64 bit
The paths are automatically configured and no other options are needed unless targeting Android. The paths are automatically configured and no other options are needed unless targeting [Android](#Android).
Before proceeding with an Android build one needs to get the [Android SDK](https://developer.android.com/studio) and use the "SDK Manager" tool to download the NDK and one or more "Platform packages" (these are Android versions and have a corresponding API level).
In order to build `ANDROID_API_LEVEL` (API level corresponding to the Android version targeted, e.g. Android 9.0 Pie is 28 and its "Platform package" needs to be available) and `ANDROID_TOOLCHAIN_BIN` (path to toolchain binaries depending on the platform the build is being performed on) need to be set.
If the build includes Qt, environment variables `ANDROID_SDK` and `ANDROID_NDK` need to be set as well but can otherwise be omitted.
This is an example command for a default build with no disabled dependencies:
ANDROID_SDK=/home/user/Android/Sdk ANDROID_NDK=/home/user/Android/Sdk/ndk-bundle make HOST=aarch64-linux-android ANDROID_API_LEVEL=28 ANDROID_TOOLCHAIN_BIN=/home/user/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin
### Install the required dependencies: Ubuntu & Debian ### Install the required dependencies: Ubuntu & Debian
@ -99,6 +94,19 @@ options will be passed to bitcoin's configure. In this case, `--disable-wallet`.
download-win: run 'make download-win' to fetch all sources needed for win builds download-win: run 'make download-win' to fetch all sources needed for win builds
download-linux: run 'make download-linux' to fetch all sources needed for linux builds download-linux: run 'make download-linux' to fetch all sources needed for linux builds
### Android
Before proceeding with an Android build one needs to get the [Android SDK](https://developer.android.com/studio) and use the "SDK Manager" tool to download the NDK and one or more "Platform packages" (these are Android versions and have a corresponding API level).
In order to build `ANDROID_API_LEVEL` (API level corresponding to the Android version targeted, e.g. Android 9.0 Pie is 28 and its "Platform package" needs to be available) and `ANDROID_TOOLCHAIN_BIN` (path to toolchain binaries depending on the platform the build is being performed on) need to be set.
API levels from 24 to 29 have been tested to work.
If the build includes Qt, environment variables `ANDROID_SDK` and `ANDROID_NDK` need to be set as well but can otherwise be omitted.
This is an example command for a default build with no disabled dependencies:
ANDROID_SDK=/home/user/Android/Sdk ANDROID_NDK=/home/user/Android/Sdk/ndk-bundle make HOST=aarch64-linux-android ANDROID_API_LEVEL=28 ANDROID_TOOLCHAIN_BIN=/home/user/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin
### Other documentation ### Other documentation
- [description.md](description.md): General description of the depends system - [description.md](description.md): General description of the depends system