# Copyright 2010 Google Inc.
#
# 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.
#
# Common gyp configuration. Based on chromium's common.gypi.

# IMPORTANT:
# Please don't directly include this file if you are building via gyp_chromium,
# since gyp_chromium is automatically forcing its inclusion.
{
  # Variables expected to be overriden on the GYP command line (-D) or by
  # ~/.gyp/include.gypi.
  'variables': {
    # Chromium uses system shared libraries on Linux by default
    # (Chromium already has transitive dependencies on these libraries
    # via gtk). We want to link these libraries into our binaries so
    # we change the default behavior.
    'use_system_zlib': 0,
    'use_system_apache_dev%': 0,

    # Putting a variables dict inside another variables dict looks kind of
    # weird.  This is done so that "branding" and "buildtype" are defined as
    # variables within the outer variables dict here.  This is necessary
    # to get these variables defined for the conditions within this variables
    # dict that operate on these variables.
    'variables': {
      'variables': {
        # Compute the architecture that we're building on.
        'conditions': [
          [ 'OS=="win" or OS=="mac"', {
            'host_arch%': 'ia32',
          }, {
            # This handles the Unix platforms for which there is some support.
            # Anything else gets passed through, which probably won't work very
            # well; such hosts should pass an explicit target_arch to gyp.
            'host_arch%':
              '<!(uname -m | sed -e "s/i.86/ia32/;s/x86_64/x64/;s/amd64/x64/;s/arm.*/arm/;s/i86pc/ia32/")',
          }],
        ],
      },

      # Copy conditionally-set variables out one scope.
      'host_arch%': '<(host_arch)',

      # We used to provide a variable for changing how libraries were built.
      # This variable remains until we can clean up all the users.
      # This needs to be one nested variables dict in so that dependent
      # gyp files can make use of it in their outer variables.  (Yikes!)
      # http://code.google.com/p/chromium/issues/detail?id=83308
      'library%': 'static_library',

      # Override buildtype to select the desired build flavor.
      # Dev - everyday build for development/testing
      # Official - release build (generally implies additional processing)
      # TODO(mmoss) Once 'buildtype' is fully supported (e.g. Windows gyp
      # conversion is done), some of the things which are now controlled by
      # 'branding', such as symbol generation, will need to be refactored based
      # on 'buildtype' (i.e. we don't care about saving symbols for non-Official
      # builds).
      'buildtype%': 'Dev',

      # Default architecture we're building for is the architecture we're
      # building on.
      'target_arch%': '<(host_arch)',

      # Python version.
      'python_ver%': '2.6',

      # The system root for cross-compiles. Default: none.
      'sysroot%': '',

      # On Linux, we build without sse2.
      'disable_sse2%': 1,

      # Variable 'component' is for cases where we would like to build some
      # components as dynamic shared libraries but still need variable
      # 'library' for static libraries.
      # By default, component is set to whatever library is set to and
      # it can be overriden by the GYP command line or by ~/.gyp/include.gypi.
      'component%': 'static_library',

      'conditions': [
        # A flag for POSIX platforms
        ['OS=="win"', {
          'os_posix%': 0,
        }, {
          'os_posix%': 1,
        }],

        # A flag for BSD platforms
        ['OS=="freebsd" or OS=="openbsd"', {
          'os_bsd%': 1,
        }, {
          'os_bsd%': 0,
        }],

        # Set to 1 compile with -fPIC cflag on linux. This is a must for shared
        # libraries on linux x86-64 and arm.
        ['host_arch=="ia32"', {
          'linux_fpic%': 0,
        }, {
          'linux_fpic%': 1,
        }],
      ],
    },

    # Copy conditionally-set variables out one scope.
    'buildtype%': '<(buildtype)',
    'target_arch%': '<(target_arch)',
    'host_arch%': '<(host_arch)',
    'library%': 'static_library',
    'os_bsd%': '<(os_bsd)',
    'os_posix%': '<(os_posix)',
    'linux_fpic%': '<(linux_fpic)',
    'python_ver%': '<(python_ver)',
    'sysroot%': '<(sysroot)',
    'disable_sse2%': '<(disable_sse2)',
    'component%': '<(component)',

    # Mac OS X SDK and deployment target support.
    # The SDK identifies the version of the system headers that will be used,
    # and corresponds to the MAC_OS_X_VERSION_MAX_ALLOWED compile-time macro.
    # "Maximum allowed" refers to the operating system version whose APIs are
    # available in the headers.
    # The deployment target identifies the minimum system version that the
    # built products are expected to function on.  It corresponds to the
    # MAC_OS_X_VERSION_MIN_REQUIRED compile-time macro.
    # To ensure these macros are available, #include <AvailabilityMacros.h>.
    # Additional documentation on these macros is available at
    # http://developer.apple.com/mac/library/technotes/tn2002/tn2064.html#SECTION3
    # Chrome normally builds with the Mac OS X 10.5 SDK and sets the
    # deployment target to 10.5.  Other projects, such as O3D, may override
    # these defaults.
    'mac_sdk%': '10.5',
    'mac_deployment_target%': '10.5',

    # TODO(bradnelson): eliminate this when possible.
    # To allow local gyp files to prevent release.vsprops from being included.
    # Yes(1) means include release.vsprops.
    # Once all vsprops settings are migrated into gyp, this can go away.
    'msvs_use_common_release%': 1,

    # TODO(bradnelson): eliminate this when possible.
    # To allow local gyp files to override additional linker options for msvs.
    # Yes(1) means set use the common linker options.
    'msvs_use_common_linker_extras%': 1,

    # Set this to true when building with Clang.
    # See http://code.google.com/p/chromium/wiki/Clang for details.
    # TODO: eventually clang should behave identically to gcc, and this
    # won't be necessary.
    'clang%': 0,

    # .gyp files or targets should set chromium_code to 1 if they build
    # Chromium-specific code, as opposed to external code.  This variable is
    # used to control such things as the set of warnings to enable, and
    # whether warnings are treated as errors.
    'chromium_code%': 0,

    # Point to ICU directory.
    'icu_src_dir': '../third_party/icu',

    'conditions': [
      ['os_posix==1 and OS!="mac"', {
        # This will set gcc_version to XY if you are running gcc X.Y.*.
        # This is used to tweak build flags for gcc 4.4.
        'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
        # Figure out the python architecture to decide if we build pyauto.
        'python_arch%': '<!(<(DEPTH)/build/linux/python_arch.sh <(sysroot)/usr/lib/libpython<(python_ver).so.1.0)',
      }],  # os_posix==1 and OS!="mac"

      # Whether to use multiple cores to compile with visual studio. This is
      # optional because it sometimes causes corruption on VS 2005.
      # It is on by default on VS 2008 and off on VS 2005.
      ['OS=="win"', {
        'conditions': [
          ['MSVS_VERSION=="2005"', {
            'msvs_multi_core_compile%': 0,
          },{
            'msvs_multi_core_compile%': 1,
          }],
          # Don't do incremental linking for large modules on 32-bit.
          ['MSVS_OS_BITS==32', {
            'msvs_large_module_debug_link_mode%': '1',  # No
          },{
            'msvs_large_module_debug_link_mode%': '2',  # Yes
          }],
          ['MSVS_VERSION=="2010e" or MSVS_VERSION=="2008e" or MSVS_VERSION=="2005e"', {
            'msvs_express%': 1,
            'secure_atl%': 0,
          },{
            'msvs_express%': 0,
            'secure_atl%': 1,
          }],
        ],
      }],
    ],
  },
  'target_defaults': {
    'variables': {
      # The condition that operates on chromium_code is in a target_conditions
      # section, and will not have access to the default fallback value of
      # chromium_code at the top of this file, or to the chromium_code
      # variable placed at the root variables scope of .gyp files, because
      # those variables are not set at target scope.  As a workaround,
      # if chromium_code is not set at target scope, define it in target scope
      # to contain whatever value it has during early variable expansion.
      # That's enough to make it available during target conditional
      # processing.
      'chromium_code%': '<(chromium_code)',

      # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
      'mac_release_optimization%': '3', # Use -O3 unless overridden
      'mac_debug_optimization%': '0',   # Use -O0 unless overridden
      # See http://msdn.microsoft.com/en-us/library/aa652360(VS.71).aspx
      'win_release_Optimization%': '2', # 2 = /Os
      'win_debug_Optimization%': '0',   # 0 = /Od
      # See http://msdn.microsoft.com/en-us/library/8wtf2dfz(VS.71).aspx
      'win_debug_RuntimeChecks%': '3',    # 3 = all checks enabled, 0 = off
      # See http://msdn.microsoft.com/en-us/library/47238hez(VS.71).aspx
      'win_debug_InlineFunctionExpansion%': '',    # empty = default, 0 = off,
      'win_release_InlineFunctionExpansion%': '2', # 1 = only __inline, 2 = max
      # VS inserts quite a lot of extra checks to algorithms like
      # std::partial_sort in Debug build which make them O(N^2)
      # instead of O(N*logN). This is particularly slow under memory
      # tools like ThreadSanitizer so we want it to be disablable.
      # See http://msdn.microsoft.com/en-us/library/aa985982(v=VS.80).aspx
      'win_debug_disable_iterator_debugging%': '0',

      'release_extra_cflags%': '',
      'debug_extra_cflags%': '',

      'conditions': [
        ['OS=="win" and component=="shared_library"', {
          # See http://msdn.microsoft.com/en-us/library/aa652367.aspx
          'win_release_RuntimeLibrary%': '2', # 2 = /MT (nondebug DLL)
          'win_debug_RuntimeLibrary%': '3',   # 3 = /MTd (debug DLL)
        }, {
          # See http://msdn.microsoft.com/en-us/library/aa652367.aspx
          'win_release_RuntimeLibrary%': '0', # 0 = /MT (nondebug static)
          'win_debug_RuntimeLibrary%': '1',   # 1 = /MTd (debug static)
        }],
      ],
    },
    # Make sure our shadow view of chromium source is available to
    # targets that don't explicitly declare their dependencies and
    # assume chromium source headers are available from the root
    # (third_party/modp_b64 is one such target).
    'include_dirs': [
      '<(DEPTH)/third_party/chromium/src',
    ],
    'target_conditions': [
      ['chromium_code==0', {
        'conditions': [
          [ 'os_posix==1 and OS!="mac"', {
            # We don't want to get warnings from third-party code,
            # so remove any existing warning-enabling flags like -Wall.
            'cflags!': [
              '-Wall',
              '-Wextra',
              '-Werror',
              '-std=gnu++0x',
            ],
            'cflags': [
              # Don't warn about hash_map in third-party code.
              '-Wno-deprecated',
              # Don't warn about printf format problems.
              # This is off by default in gcc but on in Ubuntu's gcc(!).
              '-Wno-format',
            ],
          }],
          [ 'OS=="win"', {
            'defines': [
              '_CRT_SECURE_NO_DEPRECATE',
              '_CRT_NONSTDC_NO_WARNINGS',
              '_CRT_NONSTDC_NO_DEPRECATE',
              '_SCL_SECURE_NO_DEPRECATE',
            ],
            'msvs_disabled_warnings': [4800],
            'msvs_settings': {
              'VCCLCompilerTool': {
                'WarningLevel': '3',
                'WarnAsError': 'false', # TODO(maruel): Enable it.
                'Detect64BitPortabilityProblems': 'false',
              },
            },
          }],
          [ 'OS=="mac"', {
            'xcode_settings': {
              'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',
              'WARNING_CFLAGS!': ['-Wall', '-Wextra'],
            },
          }],
        ],
      }, {
        # In Chromium code, we define __STDC_FORMAT_MACROS in order to get the
        # C99 macros on Mac and Linux.
        'defines': [
          '__STDC_FORMAT_MACROS',
        ],
        'conditions': [
          ['OS!="win"', {
            'sources/': [ ['exclude', '_win(_unittest)?\\.(h|cc)$'],
                          ['exclude', '(^|/)win/'],
                          ['exclude', '(^|/)win_[^/]*\\.(h|cc)$'] ],
          }],
          ['OS!="mac"', {
            'sources/': [ ['exclude', '_(cocoa|mac)(_unittest)?\\.(h|cc)$'],
                          ['exclude', '(^|/)(cocoa|mac)/'],
                          ['exclude', '\\.mm?$' ] ],
          }],
          ['OS!="linux"', {
            'sources/': [
              ['exclude', '_linux(_unittest)?\\.(h|cc)$'],
              ['exclude', '(^|/)linux/'],
            ],
          }],
          # We use "POSIX" to refer to all non-Windows operating systems.
          ['OS=="win"', {
            'sources/': [ ['exclude', '_posix\\.(h|cc)$'] ],
            # turn on warnings for signed/unsigned mismatch on chromium code.
            'msvs_settings': {
              'VCCLCompilerTool': {
                'AdditionalOptions': ['/we4389'],
              },
            },
          }],
        ],
      }],
    ],  # target_conditions for 'target_defaults'
    'default_configuration': 'Debug',
    'configurations': {
      # VCLinkerTool LinkIncremental values below:
      #   0 == default
      #   1 == /INCREMENTAL:NO
      #   2 == /INCREMENTAL
      # Debug links incremental, Release does not.
      #
      # Abstract base configurations to cover common attributes.
      #
      'Common_Base': {
        'abstract': 1,
        'msvs_configuration_attributes': {
          'OutputDirectory': '$(SolutionDir)$(ConfigurationName)',
          'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
          'CharacterSet': '1',
        },
      },
      'x86_Base': {
        'abstract': 1,
        'msvs_settings': {
          'VCLinkerTool': {
            'TargetMachine': '1',
          },
        },
        'msvs_configuration_platform': 'Win32',
      },
      'x64_Base': {
        'abstract': 1,
        'msvs_configuration_platform': 'x64',
        'msvs_settings': {
          'VCLinkerTool': {
            'TargetMachine': '17', # x86 - 64
          },
        },
      },
      'Debug_Base': {
        'abstract': 1,
        'defines': [
          'DYNAMIC_ANNOTATIONS_ENABLED=1',
          'WTF_USE_DYNAMIC_ANNOTATIONS=1',
        ],
        'xcode_settings': {
          'COPY_PHASE_STRIP': 'NO',
          'GCC_OPTIMIZATION_LEVEL': '<(mac_debug_optimization)',
          'OTHER_CFLAGS': [ '<@(debug_extra_cflags)', ],
        },
        'msvs_settings': {
          'VCCLCompilerTool': {
            'Optimization': '<(win_debug_Optimization)',
            'PreprocessorDefinitions': ['_DEBUG'],
            'BasicRuntimeChecks': '<(win_debug_RuntimeChecks)',
            'RuntimeLibrary': '<(win_debug_RuntimeLibrary)',
            'conditions': [
              # According to MSVS, InlineFunctionExpansion=0 means
              # "default inlining", not "/Ob0".
              # Thus, we have to handle InlineFunctionExpansion==0 separately.
              ['win_debug_InlineFunctionExpansion==0', {
                'AdditionalOptions': ['/Ob0'],
              }],
              ['win_debug_InlineFunctionExpansion!=""', {
                'InlineFunctionExpansion':
                  '<(win_debug_InlineFunctionExpansion)',
              }],
              ['win_debug_disable_iterator_debugging==1', {
                'PreprocessorDefinitions': ['_HAS_ITERATOR_DEBUGGING=0'],
              }],
            ],
          },
          'VCResourceCompilerTool': {
            'PreprocessorDefinitions': ['_DEBUG'],
          },
        },
        'conditions': [
          ['OS=="linux"', {
            'cflags': [
              '<@(debug_extra_cflags)',
            ],
          }],
        ],
      },
      'Release_Base': {
        'abstract': 1,
        'defines': [
          'NDEBUG',
        ],
        'xcode_settings': {
          'DEAD_CODE_STRIPPING': 'YES',  # -Wl,-dead_strip
          'GCC_OPTIMIZATION_LEVEL': '<(mac_release_optimization)',
          'OTHER_CFLAGS': [ '<@(release_extra_cflags)', ],
        },
        'msvs_settings': {
          'VCCLCompilerTool': {
            'Optimization': '<(win_release_Optimization)',
            'RuntimeLibrary': '<(win_release_RuntimeLibrary)',
            'conditions': [
              # According to MSVS, InlineFunctionExpansion=0 means
              # "default inlining", not "/Ob0".
              # Thus, we have to handle InlineFunctionExpansion==0 separately.
              ['win_release_InlineFunctionExpansion==0', {
                'AdditionalOptions': ['/Ob0'],
              }],
              ['win_release_InlineFunctionExpansion!=""', {
                'InlineFunctionExpansion':
                  '<(win_release_InlineFunctionExpansion)',
              }],
            ],
          },
          'VCLinkerTool': {
            'LinkIncremental': '1',
          },
        },
        'conditions': [
          ['OS=="linux"', {
            'cflags': [
             '<@(release_extra_cflags)',
            ],
          }],
        ],
      },
      #
      # Concrete configurations
      #
      'Debug': {
        'inherit_from': ['Common_Base', 'x86_Base', 'Debug_Base'],
      },
      'Release': {
        'inherit_from': ['Common_Base', 'x86_Base', 'Release_Base'],
        'conditions': [
          ['msvs_use_common_release', {
            'includes': ['release.gypi'],
          }],
        ]
      },
      'conditions': [
        [ 'OS=="win"', {
          # TODO(bradnelson): add a gyp mechanism to make this more graceful.
          'Debug_x64': {
            'inherit_from': ['Common_Base', 'x64_Base', 'Debug_Base'],
          },
          'Release_x64': {
            'inherit_from': ['Common_Base', 'x64_Base', 'Release_Base'],
          },
        }],
      ],
    },
  },
  'conditions': [
    ['os_posix==1 and OS!="mac"', {
      'target_defaults': {
        # Enable -Werror by default, but put it in a variable so it can
        # be disabled in ~/.gyp/include.gypi on the valgrind builders.
        'variables': {
          # Use -fno-strict-aliasing, see http://crbug.com/32204
          'no_strict_aliasing%': 1,
          'conditions': [
            ['OS=="linux"', {
              'werror%': '',
              }, { # turn off -Werror on other Unices
              'werror%': '',
            }],
          ],
        },
        'cflags': [
          '<(werror)',  # See note above about the werror variable.
          '-pthread',
          '-fno-exceptions',
          '-Wall',
          # TODO(evan): turn this back on once all the builds work.
          # '-Wextra',
          # Don't warn about unused function params.  We use those everywhere.
          '-Wno-unused-parameter',
          # Don't warn about the "struct foo f = {0};" initialization pattern.
          '-Wno-missing-field-initializers',
          '-D_FILE_OFFSET_BITS=64',
          # Don't export any symbols (for example, to plugins we dlopen()).
          # Note: this is *required* to make some plugins work.
          '-fvisibility=hidden',
          '-pipe',
        ],
        'cflags_cc': [
          '-fno-rtti',
          '-fno-threadsafe-statics',
          # Make inline functions have hidden visiblity by default.
          # Surprisingly, not covered by -fvisibility=hidden.
          '-fvisibility-inlines-hidden',
        ],
        'ldflags': [
          '-pthread', '-Wl,-z,noexecstack',
        ],
        'configurations': {
          'Debug_Base': {
            'variables': {
              'debug_optimize%': '0',
            },
            'defines': [
              '_DEBUG',
            ],
            'cflags': [
              '-O>(debug_optimize)',
              '-g',
            ],
          },
          'Release_Base': {
            'variables': {
              'release_optimize%': '2',
              # Binaries become big and gold is unable to perform GC
              # and remove unused sections for some of test targets
              # on 32 bit platform.
              # (This is currently observed only in chromeos valgrind bots)
              # The following flag is to disable --gc-sections linker
              # option for these bots.
              'no_gc_sections%': 0,
            },
            'cflags': [
              '-O>(release_optimize)',
              # Don't emit the GCC version ident directives, they just end up
              # in the .comment section taking up binary size.
              '-fno-ident',
              # Put data and code in their own sections, so that unused symbols
              # can be removed at link time with --gc-sections.
              '-fdata-sections',
              '-ffunction-sections',
            ],
            'ldflags': [
              # Specifically tell the linker to perform optimizations.
              # See http://lwn.net/Articles/192624/ .
              '-Wl,-O1',
              '-Wl,--as-needed',
            ],
            'conditions' : [
              ['no_gc_sections==0', {
                'ldflags': [
                  '-Wl,--gc-sections',
                ],
              }],
              ['clang==1', {
                'cflags!': [
                  '-fno-ident',
                ],
              }],
            ]
          },
        },
        'conditions': [
          [ 'target_arch=="ia32"', {
            'asflags': [
              # Needed so that libs with .s files (e.g. libicudata.a)
              # are compatible with the general 32-bit-ness.
              '-32',
            ],
            # All floating-point computations on x87 happens in 80-bit
            # precision.  Because the C and C++ language standards allow
            # the compiler to keep the floating-point values in higher
            # precision than what's specified in the source and doing so
            # is more efficient than constantly rounding up to 64-bit or
            # 32-bit precision as specified in the source, the compiler,
            # especially in the optimized mode, tries very hard to keep
            # values in x87 floating-point stack (in 80-bit precision)
            # as long as possible. This has important side effects, that
            # the real value used in computation may change depending on
            # how the compiler did the optimization - that is, the value
            # kept in 80-bit is different than the value rounded down to
            # 64-bit or 32-bit. There are possible compiler options to make
            # this behavior consistent (e.g. -ffloat-store would keep all
            # floating-values in the memory, thus force them to be rounded
            # to its original precision) but they have significant runtime
            # performance penalty.
            #
            # -mfpmath=sse -msse2 makes the compiler use SSE instructions
            # which keep floating-point values in SSE registers in its
            # native precision (32-bit for single precision, and 64-bit for
            # double precision values). This means the floating-point value
            # used during computation does not change depending on how the
            # compiler optimized the code, since the value is always kept
            # in its specified precision.
            'conditions': [
              ['disable_sse2==0', {
                'cflags': [
                  '-march=pentium4',
                  '-msse2',
                  '-mfpmath=sse',
                ],
              }, { # else: sse2 disabled
                'cflags': [
                  '-march=i686',
                ],
              }],
              # Install packages have started cropping up with
              # different headers between the 32-bit and 64-bit
              # versions, so we have to shadow those differences off
              # and make sure a 32-bit-on-64-bit build picks up the
              # right files.
              ['host_arch!="ia32"', {
                'include_dirs+': [
                  '/usr/include32',
                ],
              }],
            ],
            # -mmmx allows mmintrin.h to be used for mmx intrinsics.
            # video playback is mmx and sse2 optimized.
            'cflags': [
              '-m32',
              '-mmmx',
            ],
            'ldflags': [
              '-m32',
            ],
          }],
          ['linux_fpic==1', {
            'cflags': [
              '-fPIC',
            ],
          }],
          ['sysroot!=""', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '--sysroot=<(sysroot)',
                ],
                'ldflags': [
                  '--sysroot=<(sysroot)',
                ],
              }]]
          }],
          ['clang==1', {
            'target_conditions': [
              ['_toolset=="target"', {
                'cflags': [
                  '-Wheader-hygiene',
                  # Clang spots more unused functions.
                  '-Wno-unused-function',
                  # Don't die on dtoa code that uses a char as an array index.
                  '-Wno-char-subscripts',
                  # Survive EXPECT_EQ(unnamed_enum, unsigned int) -- see
                  # http://code.google.com/p/googletest/source/detail?r=446 .
                  # TODO(thakis): Use -isystem instead (http://crbug.com/58751 )
                  '-Wno-unnamed-type-template-args',
                ],
                'cflags!': [
                  # Clang doesn't seem to know know this flag.
                  '-mfpmath=sse',
                ],
              }]],
          }],
          ['no_strict_aliasing==1', {
            'cflags': [
              '-fno-strict-aliasing',
            ],
          }],
        ],
      },
      'conditions': [
        ['gcc_version>=43', {
          'target_defaults': {
            'cflags': [
              # Page Speed customization to enable stricter checking in
              # preparation for transition to C++0x.
              '-std=gnu++0x',
            ]
          },
        }]
      ],
    }],
    ['OS=="mac"', {
      'target_defaults': {
        'variables': {
          # These should be 'mac_real_dsym%' and 'mac_strip%', but there
          # seems to be a bug with % in variables that are intended to be
          # set to different values in different targets, like these two.
          'mac_strip': 1,      # Strip debugging symbols from the target.
          'mac_real_dsym': 0,  # Fake .dSYMs are fine in most cases.
        },
        'mac_bundle': 0,
        'xcode_settings': {
          'ALWAYS_SEARCH_USER_PATHS': 'NO',
          'GCC_C_LANGUAGE_STANDARD': 'c99',         # -std=c99
          'GCC_CW_ASM_SYNTAX': 'NO',                # No -fasm-blocks
          'GCC_DYNAMIC_NO_PIC': 'NO',               # No -mdynamic-no-pic
                                                    # (Equivalent to -fPIC)
          'GCC_ENABLE_CPP_EXCEPTIONS': 'NO',        # -fno-exceptions
          'GCC_ENABLE_CPP_RTTI': 'NO',              # -fno-rtti
          'GCC_ENABLE_PASCAL_STRINGS': 'NO',        # No -mpascal-strings
          # GCC_INLINES_ARE_PRIVATE_EXTERN maps to -fvisibility-inlines-hidden
          'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES',
          'GCC_OBJC_CALL_CXX_CDTORS': 'YES',        # -fobjc-call-cxx-cdtors
          'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES',      # -fvisibility=hidden
          'GCC_THREADSAFE_STATICS': 'NO',           # -fno-threadsafe-statics
          'GCC_TREAT_WARNINGS_AS_ERRORS': 'YES',    # -Werror
          'GCC_VERSION': '4.2',
          'GCC_WARN_ABOUT_MISSING_NEWLINE': 'YES',  # -Wnewline-eof
          # MACOSX_DEPLOYMENT_TARGET maps to -mmacosx-version-min
          'MACOSX_DEPLOYMENT_TARGET': '<(mac_deployment_target)',
          'PREBINDING': 'NO',                       # No -Wl,-prebind
          'USE_HEADERMAP': 'NO',
          'OTHER_CFLAGS': [
            '-fno-strict-aliasing',  # See http://crbug.com/32204
          ],
          'WARNING_CFLAGS': [
            '-Wall',
            '-Wendif-labels',
            '-Wextra',
            # Don't warn about unused function parameters.
            '-Wno-unused-parameter',
            # Don't warn about the "struct foo f = {0};" initialization
            # pattern.
            '-Wno-missing-field-initializers',
          ],
          'conditions': [
            ['clang==1', {
              'WARNING_CFLAGS': [
                '-Wheader-hygiene',
                # Don't die on dtoa code that uses a char as an array index.
                # This is required solely for base/third_party/dmg_fp/dtoa.cc.
                '-Wno-char-subscripts',
                # Clang spots more unused functions.
                '-Wno-unused-function',
                # Survive EXPECT_EQ(unnamed_enum, unsigned int) -- see
                # http://code.google.com/p/googletest/source/detail?r=446 .
                # TODO(thakis): Use -isystem instead (http://crbug.com/58751 ).
                '-Wno-unnamed-type-template-args',
                # TODO(thakis): Reenable once the one instance this warns on
                # is fixed.
                '-Wno-parentheses',
              ],
              'OTHER_CFLAGS': [
                # TODO(thakis): Causes many warnings - http://crbug.com/75001
                '-fobjc-exceptions',
              ],
            }],
          ],
        },
        'target_conditions': [
          ['_type!="static_library"', {
            'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-search_paths_first']},
          }],
          ['_mac_bundle', {
            'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
          }],
          ['(_type=="executable" or _type=="shared_library" or \
             _type=="loadable_module") and mac_strip!=0', {
            'target_conditions': [
              ['mac_real_dsym == 1', {
                # To get a real .dSYM bundle produced by dsymutil, set the
                # debug information format to dwarf-with-dsym.  Since
                # strip_from_xcode will not be used, set Xcode to do the
                # stripping as well.
                'configurations': {
                  'Release_Base': {
                    'xcode_settings': {
                      'DEBUG_INFORMATION_FORMAT': 'dwarf-with-dsym',
                      'DEPLOYMENT_POSTPROCESSING': 'YES',
                      'STRIP_INSTALLED_PRODUCT': 'YES',
                      'target_conditions': [
                        ['_type=="shared_library" or _type=="loadable_module"', {
                          # The Xcode default is to strip debugging symbols
                          # only (-S).  Local symbols should be stripped as
                          # well, which will be handled by -x.  Xcode will
                          # continue to insert -S when stripping even when
                          # additional flags are added with STRIPFLAGS.
                          'STRIPFLAGS': '-x',
                        }],  # _type=="shared_library" or _type=="loadable_module"'
                      ],  # target_conditions
                    },  # xcode_settings
                  },  # configuration "Release"
                },  # configurations
              }, {  # mac_real_dsym != 1
                # To get a fast fake .dSYM bundle, use a post-build step to
                # produce the .dSYM and strip the executable.  strip_from_xcode
                # only operates in the Release configuration.
                'postbuilds': [
                  {
                    'variables': {
                      # Define strip_from_xcode in a variable ending in _path
                      # so that gyp understands it's a path and performs proper
                      # relativization during dict merging.
                      'strip_from_xcode_path': '<(DEPTH)/build/mac/strip_from_xcode',
                    },
                    'postbuild_name': 'Strip If Needed',
                    'action': ['<(strip_from_xcode_path)'],
                  },
                ],  # postbuilds
              }],  # mac_real_dsym
            ],  # target_conditions
          }],  # (_type=="executable" or _type=="shared_library" or
               #  _type=="loadable_module") and mac_strip!=0
        ],  # target_conditions
      },  # target_defaults
    }],  # OS=="mac"
    ['OS=="win"', {
      'target_defaults': {
        'defines': [
          '_WIN32_WINNT=0x0600',
          'WINVER=0x0600',
          'WIN32',
          '_WINDOWS',
          'NOMINMAX',
          '_CRT_RAND_S',
          'CERT_CHAIN_PARA_HAS_EXTRA_FIELDS',
          'WIN32_LEAN_AND_MEAN',
          '_ATL_NO_OPENGL',
          '_HAS_TR1=0',
        ],
        'conditions': [
          ['component=="static_library"', {
            'defines': [
              '_HAS_EXCEPTIONS=0',
            ],
          }],
          ['secure_atl', {
            'defines': [
              '_SECURE_ATL',
            ],
          }],
        ],
        'msvs_system_include_dirs': [
          # TODO(bmcquade): is this needed?
          '$(VSInstallDir)/VC/atlmfc/include',
        ],
        'msvs_cygwin_dirs': ['<(DEPTH)/third_party/cygwin'],
        'msvs_disabled_warnings': [4351, 4396, 4503, 4819,
          # TODO(maruel): These warnings are level 4. They will be slowly
          # removed as code is fixed.
          4100, 4121, 4125, 4127, 4130, 4131, 4189, 4201, 4238, 4244, 4245,
          4310, 4355, 4428, 4481, 4505, 4510, 4512, 4530, 4610, 4611, 4701,
          4702, 4706,
        ],
        'msvs_settings': {
          'VCCLCompilerTool': {
            'MinimalRebuild': 'false',
            'BufferSecurityCheck': 'true',
            'EnableFunctionLevelLinking': 'true',
            'RuntimeTypeInfo': 'false',
            'WarningLevel': '4',
            'WarnAsError': 'true',
            'DebugInformationFormat': '3',
            'conditions': [
              ['msvs_multi_core_compile', {
                'AdditionalOptions': ['/MP'],
              }],
              ['MSVS_VERSION=="2005e"', {
                'AdditionalOptions': ['/w44068'], # Unknown pragma to 4 (ATL)
              }],
              ['component=="shared_library"', {
                'ExceptionHandling': '1',  # /EHsc
              }, {
                'ExceptionHandling': '0',
              }],
            ],
          },
          'VCLibrarianTool': {
            'AdditionalOptions': ['/ignore:4221'],
          },
          'VCLinkerTool': {
            'AdditionalDependencies': [
              'ws2_32.lib',
              'dbghelp.lib',
            ],
            'GenerateDebugInformation': 'true',
            'MapFileName': '$(OutDir)\\$(TargetName).map',
            'ImportLibrary': '$(OutDir)\\lib\\$(TargetName).lib',
            'FixedBaseAddress': '1',
            # SubSystem values:
            #   0 == not set
            #   1 == /SUBSYSTEM:CONSOLE
            #   2 == /SUBSYSTEM:WINDOWS
            # Most of the executables we'll ever create are tests
            # and utilities with console output.
            'SubSystem': '1',
          },
          'VCMIDLTool': {
            'GenerateStublessProxies': 'true',
            'TypeLibraryName': '$(InputName).tlb',
            'OutputDirectory': '$(IntDir)',
            'HeaderFileName': '$(InputName).h',
            'DLLDataFileName': 'dlldata.c',
            'InterfaceIdentifierFileName': '$(InputName)_i.c',
            'ProxyFileName': '$(InputName)_p.c',
          },
          'VCResourceCompilerTool': {
            'Culture' : '1033',
            'AdditionalIncludeDirectories': [
              '<(DEPTH)',
              '<(SHARED_INTERMEDIATE_DIR)',
            ],
          },
        },
      },
    }],
    ['OS=="win" and msvs_use_common_linker_extras', {
      'target_defaults': {
        'msvs_settings': {
          'VCLinkerTool': {
            'DelayLoadDLLs': [
              'dbghelp.dll',
            ],
          },
        },
        'configurations': {
          'x86_Base': {
            'msvs_settings': {
              'VCLinkerTool': {
                'AdditionalOptions': [
                  '/safeseh',
                  '/dynamicbase',
                  '/ignore:4199',
                  '/ignore:4221',
                  '/nxcompat',
                ],
              },
            },
          },
          'x64_Base': {
            'msvs_settings': {
              'VCLinkerTool': {
                'AdditionalOptions': [
                  # safeseh is not compatible with x64
                  '/dynamicbase',
                  '/ignore:4199',
                  '/ignore:4221',
                  '/nxcompat',
                ],
              },
            },
          },
        },
      },
    }],
  ],
  'xcode_settings': {
    # DON'T ADD ANYTHING NEW TO THIS BLOCK UNLESS YOU REALLY REALLY NEED IT!
    # This block adds *project-wide* configuration settings to each project
    # file.  It's almost always wrong to put things here.  Specify your
    # custom xcode_settings in target_defaults to add them to targets instead.

    # In an Xcode Project Info window, the "Base SDK for All Configurations"
    # setting sets the SDK on a project-wide basis.  In order to get the
    # configured SDK to show properly in the Xcode UI, SDKROOT must be set
    # here at the project level.
    'SDKROOT': 'macosx<(mac_sdk)',  # -isysroot

    # The Xcode generator will look for an xcode_settings section at the root
    # of each dict and use it to apply settings on a file-wide basis.  Most
    # settings should not be here, they should be in target-specific
    # xcode_settings sections, or better yet, should use non-Xcode-specific
    # settings in target dicts.  SYMROOT is a special case, because many other
    # Xcode variables depend on it, including variables such as
    # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
    # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
    # files to appear (when present) in the UI as actual files and not red
    # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
    # and therefore SYMROOT, needs to be set at the project level.
    'SYMROOT': '<(DEPTH)/xcodebuild',
  },
}

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