# 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")

if (current_cpu == "arm" || current_cpu == "arm64") {
  declare_args() {
    # Build file to import for ARM defaults.
    arm_platform_config = ""
  }

  if (arm_platform_config == "") {
    if (current_os == "android") {
      arm_platform_config = "${build_root}/toolchain/android/android_arm.gni"
    }
  }

  # Allow platforms to override how ARM architecture flags are chosen by
  # providing a file to import.
  if (arm_platform_config != "") {
    _platform_defaults = {
      import(arm_platform_config)
    }
  }

  _defaults = {
    arm_arch = ""
    arm_cpu = ""
    arm_tune = ""
    arm_fpu = ""
    arm_float_abi = ""
    arm_abi = ""
    arm_use_thumb = current_os != "linux" &&
                    (current_os != "android" || current_cpu != "arm64")

    # Update defaults with platform values, if any.
    if (arm_platform_config != "") {
      forward_variables_from(_platform_defaults, "*")
    }
  }

  declare_args() {
    # ARM architecture (value for -march flag).
    arm_arch = _defaults.arm_arch

    # ARM CPU (value for -mcpu flag).
    arm_cpu = _defaults.arm_cpu

    # ARM tuning (value for -mtune flag).
    arm_tune = _defaults.arm_tune

    # ARM FPU (value for -mfpu flag).
    arm_fpu = _defaults.arm_fpu

    # ARM float ABI (value for -mfloat-abi flag).
    arm_float_abi = _defaults.arm_float_abi

    # ARM ABI (value for -mabi flag).
    arm_abi = _defaults.arm_abi

    # ARM thumb instruction set (value for -mthumb flag).
    arm_use_thumb = _defaults.arm_use_thumb
  }
}