# Copyright 2021 The Cobalt Authors. All Rights Reserved.
#
# 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/config/compiler/compiler.gni")
import("//starboard/build/config/os_definitions.gni")

config("base") {
  defines = [ "USE_COBALT_CUSTOMIZATIONS" ]

  if (is_debug) {
    defines += [
      "STARBOARD_BUILD_TYPE_DEBUG",
      "COBALT_BUILD_TYPE_DEBUG",
      "_DEBUG",
      "COBALT_LOGGING_ENABLED",
    ]
  }

  if (is_devel) {
    defines += [
      "STARBOARD_BUILD_TYPE_DEVEL",
      "COBALT_BUILD_TYPE_DEVEL",
      "_DEBUG",
      "COBALT_LOGGING_ENABLED",
    ]
  }

  if (is_qa) {
    defines += [
      "STARBOARD_BUILD_TYPE_QA",
      "COBALT_BUILD_TYPE_QA",
      "NDEBUG",
    ]
  }

  if (is_gold) {
    defines += [
      "STARBOARD_BUILD_TYPE_GOLD",
      "COBALT_BUILD_TYPE_GOLD",
      "NDEBUG",
      "OFFICIAL_BUILD",
      "TRACING_DISABLED",
      "COBALT_FORCE_CSP",
      "COBALT_FORCE_CORS",
    ]
  }

  if (enable_in_app_dial) {
    defines += [ "DIAL_SERVER" ]
  }
}

config("host") {
  if (current_toolchain == host_toolchain) {
    if (is_linux) {
      ldflags = [ "-pthread" ]
      configs = [ ":linux_host_cpp_config" ]

      if (target_cpu == "arm" || target_cpu == "x86") {
        cflags = [ "-m32" ]
        ldflags += [ "-latomic" ]

        if (is_clang) {
          ldflags += [
            "-target",
            "i386-unknown-linux-gnu",
          ]
        } else {
          ldflags += [ "-m32" ]
        }
      }
    } else if (is_win) {
      # A few flags to mute MSVC compiler errors that does not appear on Linux.
      cflags = [
        "/wd4267",  # Possible loss of precision from size_t to a smaller type.
        "/wd4715",  # Not all control paths return value.
      ]
      configs = [ ":win_cpp17_config" ]
    } else if (is_apple) {
      configs = [ ":apple_cpp17_config" ]
    }
  }
}

config("target") {
  if (current_toolchain != host_toolchain) {
    if (final_executable_type == "shared_library") {
      if (!sb_is_modular || sb_is_evergreen) {
        # Rewrite main() functions into StarboardMain. TODO: This is a
        # hack, it would be better to be more surgical, here.
        defines = [ "main=StarboardMain" ]
      }

      # To link into a shared library on Linux and similar platforms,
      # the compiler must be told to generate Position Independent Code.
      # This appears to cause errors when linking the code statically,
      # however.
      # For windows based platforms this flag causes a linker error while building with cobalt toolchain
      if (!(host_os == "win" && sb_is_modular &&
            current_toolchain == cobalt_toolchain)) {
        cflags = [ "-fPIC" ]
      }
    }

    if (is_starboard) {
      configs = [ ":starboard" ]
    } else if (is_native_target_build) {
      configs = [ ":native_target_build" ]
    }
  }
}

# TODO(b/212641065): Scope global defines migrated from
# cobalt_configuration.gypi to only the targets they're necessary in.
config("starboard") {
  if (is_starboardized_toolchain) {
    defines = [
      "STARBOARD",
      "COBALT",  # TODO: See if this can be replaced by STARBOARD macro.
    ]

    if (!is_gold) {
      defines += [
        "ENABLE_DEBUGGER",
        "ENABLE_DEBUG_COMMAND_LINE_SWITCHES",
        "ENABLE_TEST_RUNNER",
        "ENABLE_IGNORE_CERTIFICATE_ERRORS",
      ]
    }

    if (is_internal_build) {
      defines += [ "INTERNAL_BUILD" ]
    }

    if (sb_enable_lib) {
      defines += [ "SB_IS_LIBRARY=1" ]
    }

    if (sb_is_modular) {
      defines += [ "SB_IS_MODULAR=1" ]
    }

    if (sb_is_evergreen) {
      defines += [ "SB_IS_EVERGREEN=1" ]
    }

    if (sb_is_evergreen_compatible) {
      defines += [ "SB_IS_EVERGREEN_COMPATIBLE=1" ]
    }

    if (sb_evergreen_compatible_use_libunwind) {
      defines += [ "SB_IS_EVERGREEN_COMPATIBLE_LIBUNWIND=1" ]
    }

    defines += [
      "STARBOARD_ATOMIC_INCLUDE=\"$starboard_path/atomic_public.h\"",
      "STARBOARD_CONFIGURATION_INCLUDE=\"$starboard_path/configuration_public.h\"",
    ]
  }
}

config("native_target_build") {
  defines = [ "NATIVE_TARGET_BUILD" ]
}

config("starboard_implementation") {
  # This allows the benchmarks to include internal only header files.
  defines = [ "STARBOARD_IMPLEMENTATION" ]
  if (current_cpu == "arm64" || (current_cpu == "arm" && arm_use_neon)) {
    defines += [ "USE_NEON" ]
  }
}

config("speed") {
  if (is_starboardized_toolchain) {
    if (defined(speed_config_path)) {
      configs = [ speed_config_path ]
    }
  }
}

config("size") {
  if (is_starboardized_toolchain) {
    if (defined(size_config_path)) {
      configs = [ size_config_path ]
    }
  }
}

config("pedantic_warnings") {
  if (is_starboardized_toolchain) {
    if (defined(pedantic_warnings_config_path)) {
      configs = [ pedantic_warnings_config_path ]
    }
  }
}

config("no_pedantic_warnings") {
  if (is_starboardized_toolchain ||
      current_toolchain == "//$starboard_path/toolchain:native_target") {
    if (defined(no_pedantic_warnings_config_path)) {
      configs = [ no_pedantic_warnings_config_path ]
    }
  }
}

config("warnings_as_errors") {
  if (is_win && treat_warnings_as_errors) {
    cflags = [ "/WX" ]
  }
}

# This config is defined here and added as a default config so that the flags
# specified in it can be overridden by targets. It's not possible for targets to
# override flags specified in a platform's "platform_configuration" config,
# which is where these particular flags would otherwise naturally fit.
config("default_compiler_flags") {
  if (is_starboardized_toolchain && sb_is_modular &&
      current_toolchain == cobalt_toolchain && target_cpu == "arm") {
    cflags = [ "-mfpu=vfpv3" ]
    asmflags = cflags
  }
}

# This config is intended to encapsulate all platform-specific logic for selecting the C++ standard
# version in shared code while building with the default toolchain.
# Starboard platform-specific build code should not attempt to overload this.
config("default_cpp_standard") {
  if (current_toolchain == default_toolchain) {
    if (sb_is_modular || is_android) {
      configs = [ ":modular_cpp17_config" ]
    } else if (is_host_win) {
      # These flags apply to non-modular windows platforms which includes win32, xb1.
      configs = [ ":win_cpp17_config" ]
    } else if (is_linux) {
      configs = [ ":linux_non_modular_cpp17_config" ]
    } else if (is_apple) {
      configs = [ ":apple_cpp17_config" ]
    } else {
      assert(
          false,
          "One of the above compiler c++ standard flags must be applicable while building with default toolchain.")
    }
  }
}

config("cpp20_supported_config") {
  if (current_toolchain == default_toolchain) {
    if (sb_is_modular || is_android) {
      configs = [ ":modular_cpp20_config" ]
    } else if (is_host_win) {
      # These flags apply to non-modular windows platforms which includes win32, xb1.
      configs = [ ":win_cpp20_config" ]
    } else if (is_linux) {
      configs = [ ":linux_non_modular_cpp20_config" ]
    } else if (is_apple) {
      configs = [ ":apple_cpp20_config" ]
    } else {
      assert(
          false,
          "One of the above compiler c++ standard flags must be applicable while building with default toolchain.")
    }
  }
}

config("win_cpp17_config") {
  cflags = [ "/std:c++17" ]
}

config("win_cpp20_config") {
  cflags = [ "/std:c++20" ]
}

config("apple_cpp17_config") {
  cflags_cc = [ "-std=gnu++17" ]
  cflags_objcc = [ "-std=gnu++17" ]
}

config("apple_cpp20_config") {
  cflags_cc = [ "-std=gnu++20" ]
  cflags_objcc = [ "-std=gnu++20" ]
}

config("linux_host_cpp_config") {
  cflags_cc = [ "-std=gnu++14" ]
}

config("linux_non_modular_cpp17_config") {
  cflags_cc = [ "-std=gnu++17" ]
}

config("linux_non_modular_cpp20_config") {
  cflags_cc = [ "-std=gnu++20" ]
}

config("modular_cpp17_config") {
  cflags_cc = [ "-std=c++17" ]
}

config("modular_cpp20_config") {
  cflags_cc = [ "-std=c++20" ]
}