Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/tools/gn/secondary/build/config/BUILDCONFIG.gn

-# =============================================================================
-# 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_component_build = 1
-  is_chromeos = 0
-  is_debug = 1
-  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:chromium_code",
-  "//build/config/compiler:disable_annoying_warnings",
-  "//build/config/compiler:no_rtti",
-  "//build/config/compiler:runtime_library",
-]
-if (is_win) {
-  native_compiler_configs += "//build/config/win:sdk"
-}
-
-if (is_debug) {
-  native_compiler_configs += "//build/config:debug"
-} else {
-  native_compiler_configs += "//build/config::release"
-}
-
-set_defaults("executable") {
-  configs = native_compiler_configs
-}
-
-set_defaults("static_library") {
-  configs = native_compiler_configs
-}
-
-set_defaults("shared_library") {
-  configs = native_compiler_configs
-}
-
-# ==============================================================================
-# TOOLCHAIN SETUP
-# ==============================================================================
-
-if (is_win) {
-  set_default_toolchain("//build/config/win:32")
-}