build/chip/java/BUILD.gn

# Copyright (c) 2020 Project CHIP Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import("//build_overrides/build.gni")

import("${build_root}/config/android/config.gni")
import("${build_root}/config/android_abi.gni")

# Determine NDK host platform based on actual host OS, not target OS
# This handles cross-compilation scenarios where current_os might be "android"
# but we're building on a different host platform
if (host_os == "linux") {
  android_ndk_host_platform = "linux-x86_64"
} else if (host_os == "mac") {
  android_ndk_host_platform = "darwin-x86_64"
} else if (host_os == "win") {
  android_ndk_host_platform = "windows-x86_64"
} else {
  # Fallback to current_os logic for compatibility. Older GN versions or certain
  # build configurations might not have `host_os` defined or it might be
  # empty/undefined.
  if (current_os == "linux" || current_os == "android") {
    android_ndk_host_platform = "linux-x86_64"
  } else if (current_os == "mac") {
    android_ndk_host_platform = "darwin-x86_64"
  } else {
    assert(
        false,
        "Unsupported host OS for Android NDK prebuilts: host_os=${host_os}, current_os=${current_os}")
  }
}

# DEBUG: Print critical build information
print("=== CHIP Java BUILD.gn Debug ===")
print("host_os: ${host_os}")
print("current_os: ${current_os}")
print("current_cpu: ${current_cpu}")
print("android_ndk_host_platform: ${android_ndk_host_platform}")
print("android_ndk_root: ${android_ndk_root}")
print("android_sdk_root: ${android_sdk_root}")
print("android_abi: ${android_abi}")
print("build_root: ${build_root}")
print("root_out_dir: ${root_out_dir}")

if (current_cpu == "arm") {
  android_toolchain_dir = "arm-linux-androideabi"
} else if (current_cpu == "arm64") {
  android_toolchain_dir = "aarch64-linux-android"
} else if (current_cpu == "x64") {
  android_toolchain_dir = "x86_64-linux-android"
} else if (current_cpu == "x86") {
  android_toolchain_dir = "i686-linux-android"
} else if (current_cpu == "riscv64") {
  android_toolchain_dir = "riscv64-linux-android"
} else {
  assert(false, "Unsupported target_cpu for Android: ${current_cpu}")
}

# DEBUG: Print determined toolchain directory
print("android_toolchain_dir: ${android_toolchain_dir}")

# Place a copy of the shared c++ support library in the jni output directory
# See:
#   https://developer.android.com/ndk/guides/cpp-support
#
# Generally CHIP cannot ensure a single shared library per java application, so a shared
# CPP support library is used
copy("shared_cpplib") {
  sources = [ "${android_ndk_root}/toolchains/llvm/prebuilt/${android_ndk_host_platform}/sysroot/usr/lib/${android_toolchain_dir}/libc++_shared.so" ]
  outputs = [ "${root_out_dir}/lib/jni/${android_abi}/libc++_shared.so" ]

  # DEBUG: Print critical paths
  print(
      "libc++_shared.so source: ${android_ndk_root}/toolchains/llvm/prebuilt/${android_ndk_host_platform}/sysroot/usr/lib/${android_toolchain_dir}/libc++_shared.so")
  print(
      "libc++_shared.so output: ${root_out_dir}/lib/jni/${android_abi}/libc++_shared.so")
  print("=== End Debug ===")
}