# Copyright (c) 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# =============================================================================
# BUILD FLAGS
# =============================================================================
#
# This block lists input arguments to the build, along with their default
# values. GN requires listing them explicitly so it can validate input and have
# a central place to manage the build flags.
#
# If a value is specified on the command line, it will overwrite the defaults
# given here, otherwise the default will be injected into the root scope.
#
# KEEP IN ALPHABETICAL ORDER and write a good description for everything.
# Use "is_*" names for intrinsic platform descriptions and build modes, and
# "use_*" names for optional features libraries, and configurations.
declare_args() {
  is_android = 0
  is_component_build = 1
  is_chromeos = 0
  is_debug = 1
  is_ios = 0
  use_ash = 0
  use_aura = 0
  use_ozone = 0
}

# =============================================================================
# SOURCES FILTERS
# =============================================================================
#
# These patterns filter out platform-specific files when assigning to the
# sources variable. The magic variable |sources_assignment_filter| is applied
# to each assignment or appending to the sources variable and matches are
# automatcally removed.
#
# We define lists of filters for each platform for all builds so they can
# be used by individual targets if necessary (a target can always change
# sources_assignment_filter on itself if it needs something more specific).
#
# Note that the patterns are NOT regular expressions. Only "*" and "\b" (path
# boundary = end of string or slash) are supported, and the entire string
# muct match the pattern (so you need "*.cc" to match all .cc files, for
# example).

windows_sources_filters = [
  "*_win.cc",
  "*_win.h",
  "*_win_unittest.cc",
  "*\bwin/*",
]
mac_sources_filters = [
  "*_mac.h",
  "*_mac.cc",
  "*_mac.mm",
  "*_mac_unittest.h",
  "*_mac_unittest.cc",
  "*_mac_unittest.mm",
  "*\bmac/*",
  "*_cocoa.h",
  "*_cocoa.cc",
  "*_cocoa.mm",
  "*_cocoa_unittest.h",
  "*_cocoa_unittest.cc",
  "*_cocoa_unittest.mm",
  "*\bcocoa/*",
]
ios_sources_filters = [
  "*_ios.h",
  "*_ios.cc",
  "*_ios.mm",
  "*_ios_unittest.h",
  "*_ios_unittest.cc",
  "*_ios_unittest.mm",
  "*\bios/*",
]
objective_c_sources_filters = [
  "*.mm",
]
linux_sources_filters = [
  "*_linux.h",
  "*_linux.cc",
  "*_linux_unittest.h",
  "*_linux_unittest.cc",
  "*\blinux/*",
]
android_sources_filters = [
  "*_android.h",
  "*_android.cc",
  "*_android_unittest.h",
  "*_android_unittest.cc",
  "*\bandroid/*",
]
posix_sources_filters = [
  "*_posix.h",
  "*_posix.cc",
  "*_posix_unittest.h",
  "*_posix_unittest.cc",
  "*\bposix/*",
]

# Construct the full list of sources we're using for this platform.
sources_assignment_filter = []
if (is_win) {
  sources_assignment_filter += posix_sources_filters
} else {
  sources_assignment_filter += windows_sources_filters
}
if (!is_mac) {
  sources_assignment_filter += mac_sources_filters
}
if (!is_ios) {
  sources_assignment_filter += ios_sources_filters
}
if (!is_mac && !is_ios) {
  sources_assignment_filter += objective_c_sources_filters
}
if (!is_linux) {
  sources_assignment_filter += linux_sources_filters
}
if (!is_android) {
  sources_assignment_filter += android_sources_filters
}

# This is the actual set.
set_sources_assignment_filter(sources_assignment_filter)

# =============================================================================
# SYSTEM CONFIG
# =============================================================================

is_nacl = 0

# =============================================================================
# BUILD OPTIONS
# =============================================================================

if (is_component_build) {
  component_mode = "shared_library"
} else {
  component_mode = "static_library"
}

# =============================================================================
# TARGET DEFAULTS
# =============================================================================
#
# Set up the default configuration for every build target of the given type.
# The values configured here will be automatically set on the scope of the
# corresponding target. Target definitions can add or remove to the settings
# here as needed.

# Holds all configs used for making native executables and libraries, to avoid
# duplication in each target below.
native_compiler_configs = [
  "//build/config:my_msvs",  # TODO(brettw) eraseme

  "//build/config/compiler:compiler",
  "//build/config/compiler:chromium_code",
  "//build/config/compiler:default_warnings",
  "//build/config/compiler:no_rtti",
  "//build/config/compiler:runtime_library",
]
if (is_win) {
  native_compiler_configs += "//build/config/win:sdk"
} else if (is_mac) {
  # TODO(brettw) this should be in an if (is_clang) block instead but I haven't
  # written an is_clang flag yet.
  native_compiler_configs += "//build/config/clang:find_bad_constructs"
}

if (is_debug) {
  native_compiler_configs += "//build/config:debug"
} else {
  native_compiler_configs += "//build/config:release"
}

set_defaults("executable") {
  configs = native_compiler_configs
  if (is_mac) {
    configs += "//build/config/mac:mac_dynamic_flags"
  } else if (is_linux) {
    configs += "//build/config/linux:executable_ldconfig"
  }
}

set_defaults("static_library") {
  configs = native_compiler_configs
}

set_defaults("shared_library") {
  configs = native_compiler_configs
  if (is_mac) {
    configs += "//build/config/mac:mac_dynamic_flags"
  }
}

# ==============================================================================
# TOOLCHAIN SETUP
# ==============================================================================

if (is_win) {
  set_default_toolchain("//build/config/win:32")
} else if (is_linux) {
  set_default_toolchain("//build/config/linux/toolchain:gcc")
} else if (is_mac) {
  set_default_toolchain("//build/config/mac:clang")
}