build,deps: move gypfiles out 2/2 - moving

* move all used files to `tools/v8_gypfiles` directory
* fix references in node configuration

PR-URL: https://github.com/nodejs/node/pull/26685
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

1 files changed, 1424 insertions, 0 deletions

diff --git a/tools/v8_gypfiles/toolchain.gypi b/tools/v8_gypfiles/toolchain.gypi
new file mode 100644
index 0000000000..909dfa7970
--- /dev/null
+++ b/tools/v8_gypfiles/toolchain.gypi
@@ -0,0 +1,1424 @@
+# Copyright 2013 the V8 project authors. All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+#       copyright notice, this list of conditions and the following
+#       disclaimer in the documentation and/or other materials provided
+#       with the distribution.
+#     * Neither the name of Google Inc. nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Shared definitions for all V8-related targets.
+
+{
+  'variables': {
+    'msvs_use_common_release': 0,
+    'clang%': 0,
+    'asan%': 0,
+    'cfi_vptr%': 0,
+    'lsan%': 0,
+    'msan%': 0,
+    'tsan%': 0,
+    'ubsan%': 0,
+    'ubsan_vptr%': 0,
+    'has_valgrind%': 0,
+    'coverage%': 0,
+    'v8_target_arch%': '<(target_arch)',
+    'v8_host_byteorder%': '<!(python -c "import sys; print(sys.byteorder)")',
+    'force_dynamic_crt%': 0,
+
+    # Setting 'v8_can_use_vfp32dregs' to 'true' will cause V8 to use the VFP
+    # registers d16-d31 in the generated code, both in the snapshot and for the
+    # ARM target. Leaving the default value of 'false' will avoid the use of
+    # these registers in the snapshot and use CPU feature probing when running
+    # on the target.
+    'v8_can_use_vfp32dregs%': 'false',
+    'arm_test_noprobe%': 'off',
+
+    # Similar to vfp but on MIPS.
+    'v8_can_use_fpu_instructions%': 'true',
+
+    # Similar to the ARM hard float ABI but on MIPS.
+    'v8_use_mips_abi_hardfloat%': 'true',
+
+    # MIPS MSA support
+    'mips_use_msa%': 0,
+
+    # Print to stdout on Android.
+    'v8_android_log_stdout%': 0,
+
+    # Force disable libstdc++ debug mode.
+    'disable_glibcxx_debug%': 0,
+
+    'v8_enable_backtrace%': 0,
+
+    # Enable profiling support. Only required on Windows.
+    'v8_enable_prof%': 0,
+
+    # Some versions of GCC 4.5 seem to need -fno-strict-aliasing.
+    'v8_no_strict_aliasing%': 0,
+
+    # Chrome needs this definition unconditionally. For standalone V8 builds,
+    # it's handled in gypfiles/standalone.gypi.
+    'want_separate_host_toolset%': 1,
+
+    # Toolset the shell binary should be compiled for. Possible values are
+    # 'host' and 'target'.
+    # The setting is ignored if want_separate_host_toolset is 0.
+    'v8_toolset_for_shell%': 'target',
+
+    'host_os%': '<(OS)',
+    'werror%': '-Werror',
+    # For a shared library build, results in "libv8-<(soname_version).so".
+    'soname_version%': '',
+
+    # Allow to suppress the array bounds warning (default is no suppression).
+    'wno_array_bounds%': '',
+
+    # Override where to find binutils
+    'binutils_dir%': '',
+
+    'conditions': [
+      ['OS=="linux" and host_arch=="x64"', {
+        'binutils_dir%': 'third_party/binutils/Linux_x64/Release/bin',
+      }],
+      ['OS=="linux" and host_arch=="ia32"', {
+        'binutils_dir%': 'third_party/binutils/Linux_ia32/Release/bin',
+      }],
+
+      # linux_use_bundled_gold: whether to use the gold linker binary checked
+      # into third_party/binutils.  Force this off via GYP_DEFINES when you
+      # are using a custom toolchain and need to control -B in ldflags.
+      # Do not use 32-bit gold on 32-bit hosts as it runs out address space
+      # for component=static_library builds.
+      ['((OS=="linux" or OS=="android") and (target_arch=="x64" or target_arch=="arm" or (target_arch=="ia32" and host_arch=="x64"))) or (OS=="linux" and target_arch=="mipsel")', {
+        'linux_use_bundled_gold%': 1,
+      }, {
+        'linux_use_bundled_gold%': 0,
+      }],
+      # linux_use_bundled_binutils: whether to use the binary binutils
+      # checked into third_party/binutils.  These are not multi-arch so cannot
+      # be used except on x86 and x86-64 (the only two architectures which
+      # are currently checke in).  Force this off via GYP_DEFINES when you
+      # are using a custom toolchain and need to control -B in cflags.
+      ['OS=="linux" and (target_arch=="ia32" or target_arch=="x64")', {
+        'linux_use_bundled_binutils%': 1,
+      }, {
+        'linux_use_bundled_binutils%': 0,
+      }],
+      # linux_use_gold_flags: whether to use build flags that rely on gold.
+      # On by default for x64 Linux.
+      ['OS=="linux" and target_arch=="x64"', {
+        'linux_use_gold_flags%': 1,
+      }, {
+        'linux_use_gold_flags%': 0,
+      }],
+    ],
+
+    # Indicates if gcmole tools are downloaded by a hook.
+    'gcmole%': 0,
+  },
+  'conditions': [
+    ['host_arch=="ia32" or host_arch=="x64" or \
+      host_arch=="ppc" or host_arch=="ppc64" or \
+      host_arch=="s390" or host_arch=="s390x" or \
+      clang==1', {
+      'variables': {
+        'host_cxx_is_biarch%': 1,
+       },
+     }, {
+      'variables': {
+        'host_cxx_is_biarch%': 0,
+      },
+    }],
+    ['target_arch=="ia32" or target_arch=="x64" or \
+      target_arch=="ppc" or target_arch=="ppc64" or target_arch=="s390" or \
+      target_arch=="s390x" or clang==1', {
+      'variables': {
+        'target_cxx_is_biarch%': 1,
+       },
+     }, {
+      'variables': {
+        'target_cxx_is_biarch%': 0,
+      },
+    }],
+  ],
+  'target_defaults': {
+    'include_dirs': [
+      '<(V8_ROOT)',
+      '<(V8_ROOT)/include',
+    ],
+    'conditions': [
+      ['v8_target_arch=="arm"', {
+        'defines': [
+          'V8_TARGET_ARCH_ARM',
+        ],
+        'conditions': [
+          [ 'arm_version==7 or arm_version=="default"', {
+            'defines': [
+              'CAN_USE_ARMV7_INSTRUCTIONS',
+            ],
+          }],
+          [ 'arm_fpu=="vfpv3-d16" or arm_fpu=="default"', {
+            'defines': [
+              'CAN_USE_VFP3_INSTRUCTIONS',
+            ],
+          }],
+          [ 'arm_fpu=="vfpv3"', {
+            'defines': [
+              'CAN_USE_VFP3_INSTRUCTIONS',
+              'CAN_USE_VFP32DREGS',
+            ],
+          }],
+          [ 'arm_fpu=="neon"', {
+            'defines': [
+              'CAN_USE_VFP3_INSTRUCTIONS',
+              'CAN_USE_VFP32DREGS',
+              'CAN_USE_NEON',
+            ],
+          }],
+          [ 'arm_test_noprobe=="on"', {
+            'defines': [
+              'ARM_TEST_NO_FEATURE_PROBE',
+            ],
+          }],
+        ],
+        'target_conditions': [
+          ['_toolset=="host"', {
+            'conditions': [
+              ['v8_target_arch==host_arch', {
+                # Host built with an Arm CXX compiler.
+                'conditions': [
+                  [ 'arm_version==7', {
+                    'cflags': ['-march=armv7-a',],
+                  }],
+                  [ 'arm_version==7 or arm_version=="default"', {
+                    'conditions': [
+                      [ 'arm_fpu!="default"', {
+                        'cflags': ['-mfpu=<(arm_fpu)',],
+                      }],
+                    ],
+                  }],
+                  [ 'arm_float_abi!="default"', {
+                    'cflags': ['-mfloat-abi=<(arm_float_abi)',],
+                  }],
+                  [ 'arm_thumb==1', {
+                    'cflags': ['-mthumb',],
+                  }],
+                  [ 'arm_thumb==0', {
+                    'cflags': ['-marm',],
+                  }],
+                ],
+              }, {
+                # 'v8_target_arch!=host_arch'
+                # Host not built with an Arm CXX compiler (simulator build).
+                'conditions': [
+                  [ 'arm_float_abi=="hard"', {
+                    'defines': [
+                      'USE_EABI_HARDFLOAT=1',
+                    ],
+                  }],
+                  [ 'arm_float_abi=="softfp" or arm_float_abi=="default"', {
+                    'defines': [
+                      'USE_EABI_HARDFLOAT=0',
+                    ],
+                  }],
+                ],
+              }],
+            ],
+          }],  # _toolset=="host"
+          ['_toolset=="target"', {
+            'conditions': [
+              ['v8_target_arch==target_arch', {
+                # Target built with an Arm CXX compiler.
+                'conditions': [
+                  [ 'arm_version==7', {
+                    'cflags': ['-march=armv7-a',],
+                  }],
+                  [ 'arm_version==7 or arm_version=="default"', {
+                    'conditions': [
+                      [ 'arm_fpu!="default"', {
+                        'cflags': ['-mfpu=<(arm_fpu)',],
+                      }],
+                    ],
+                  }],
+                  [ 'arm_float_abi!="default"', {
+                    'cflags': ['-mfloat-abi=<(arm_float_abi)',],
+                  }],
+                  [ 'arm_thumb==1', {
+                    'cflags': ['-mthumb',],
+                  }],
+                  [ 'arm_thumb==0', {
+                    'cflags': ['-marm',],
+                  }],
+                ],
+              }, {
+                # 'v8_target_arch!=target_arch'
+                # Target not built with an Arm CXX compiler (simulator build).
+                'conditions': [
+                  [ 'arm_float_abi=="hard"', {
+                    'defines': [
+                      'USE_EABI_HARDFLOAT=1',
+                    ],
+                  }],
+                  [ 'arm_float_abi=="softfp" or arm_float_abi=="default"', {
+                    'defines': [
+                      'USE_EABI_HARDFLOAT=0',
+                    ],
+                  }],
+                ],
+              }],
+            ],
+          }],  # _toolset=="target"
+        ],
+      }],  # v8_target_arch=="arm"
+      ['v8_target_arch=="arm64"', {
+        'defines': [
+          'V8_TARGET_ARCH_ARM64',
+        ],
+      }],
+      ['v8_target_arch=="s390" or v8_target_arch=="s390x"', {
+        'defines': [
+          'V8_TARGET_ARCH_S390',
+        ],
+        'conditions': [
+          ['v8_target_arch=="s390x"', {
+            'defines': [
+              'V8_TARGET_ARCH_S390X',
+            ],
+          }],
+          ['v8_host_byteorder=="little"', {
+            'defines': [
+              'V8_TARGET_ARCH_S390_LE_SIM',
+            ],
+          }, {
+            'cflags': [ '-march=z196' ],
+          }],
+          ],
+      }],  # s390
+      ['v8_target_arch=="ppc" or v8_target_arch=="ppc64"', {
+        'defines': [
+          'V8_TARGET_ARCH_PPC',
+        ],
+        'conditions': [
+          ['v8_target_arch=="ppc64"', {
+            'defines': [
+              'V8_TARGET_ARCH_PPC64',
+            ],
+          }],
+          ['v8_host_byteorder=="little"', {
+            'defines': [
+              'V8_TARGET_ARCH_PPC_LE',
+            ],
+          }],
+          ['v8_host_byteorder=="big"', {
+            'defines': [
+              'V8_TARGET_ARCH_PPC_BE',
+            ],
+            'conditions': [
+              ['OS=="aix"', {
+                # Work around AIX ceil, trunc and round oddities.
+                'cflags': [ '-mcpu=power5+ -mfprnd' ],
+              }],
+              ['OS=="aix"', {
+                # Work around AIX assembler popcntb bug.
+                'cflags': [ '-mno-popcntb' ],
+              }],
+            ],
+          }],
+        ],
+      }],  # ppc
+      ['v8_target_arch=="ia32"', {
+        'defines': [
+          'V8_TARGET_ARCH_IA32',
+        ],
+      }],  # v8_target_arch=="ia32"
+      ['v8_target_arch=="mips" or v8_target_arch=="mipsel" \
+        or v8_target_arch=="mips64" or v8_target_arch=="mips64el"', {
+        'target_conditions': [
+          ['_toolset=="target"', {
+            'conditions': [
+              ['v8_target_arch==target_arch', {
+                # Target built with a Mips CXX compiler.
+                'variables': {
+                  'ldso_path%': '<!(/bin/echo -n $LDSO_PATH)',
+                  'ld_r_path%': '<!(/bin/echo -n $LD_R_PATH)',
+                },
+                'conditions': [
+                  ['ldso_path!=""', {
+                    'ldflags': ['-Wl,--dynamic-linker=<(ldso_path)'],
+                  }],
+                  ['ld_r_path!=""', {
+                    'ldflags': ['-Wl,--rpath=<(ld_r_path)'],
+                  }],
+                  [ 'clang==1', {
+                    'cflags': ['-integrated-as'],
+                  }],
+                  ['OS!="mac"', {
+                    'defines': ['_MIPS_TARGET_HW',],
+                  }, {
+                    'defines': ['_MIPS_TARGET_SIMULATOR',],
+                  }],
+                ],
+              }, {
+                'defines': ['_MIPS_TARGET_SIMULATOR',],
+              }],
+            ],
+          }],  #'_toolset=="target"
+          ['_toolset=="host"', {
+            'conditions': [
+              ['v8_target_arch==target_arch and OS!="mac"', {
+                'defines': ['_MIPS_TARGET_HW',],
+              }, {
+                'defines': ['_MIPS_TARGET_SIMULATOR',],
+              }],
+            ],
+          }],  #'_toolset=="host"
+        ],
+      }],
+      ['v8_target_arch=="mips"', {
+        'defines': [
+          'V8_TARGET_ARCH_MIPS',
+        ],
+        'conditions': [
+          [ 'v8_can_use_fpu_instructions=="true"', {
+            'defines': [
+              'CAN_USE_FPU_INSTRUCTIONS',
+            ],
+          }],
+          [ 'v8_use_mips_abi_hardfloat=="true"', {
+            'defines': [
+              '__mips_hard_float=1',
+              'CAN_USE_FPU_INSTRUCTIONS',
+            ],
+          }, {
+            'defines': [
+              '__mips_soft_float=1'
+            ]
+          }],
+        ],
+        'target_conditions': [
+          ['_toolset=="target"', {
+            'conditions': [
+              ['v8_target_arch==target_arch', {
+                # Target built with a Mips CXX compiler.
+                'cflags': [
+                  '-EB',
+                  '-Wno-error=array-bounds',  # Workaround https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56273
+                ],
+                'ldflags': ['-EB'],
+                'conditions': [
+                  [ 'v8_use_mips_abi_hardfloat=="true"', {
+                    'cflags': ['-mhard-float'],
+                    'ldflags': ['-mhard-float'],
+                  }, {
+                    'cflags': ['-msoft-float'],
+                    'ldflags': ['-msoft-float'],
+                  }],
+                  ['mips_arch_variant=="r6"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R6',
+                      'FPU_MODE_FP64',
+                    ],
+                    'cflags!': ['-mfp32', '-mfpxx'],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips32r6'],
+                      }],
+                    ],
+                    'cflags': ['-mips32r6'],
+                    'ldflags': ['-mips32r6'],
+                  }],
+                  ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                    'defines': [ '_MIPS_MSA' ],
+                  }],
+                  ['mips_arch_variant=="r2"', {
+                    'conditions': [
+                      [ 'mips_fpu_mode=="fp64"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FP64',
+                        ],
+                        'cflags': ['-mfp64'],
+                      }],
+                      ['mips_fpu_mode=="fpxx"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FPXX',
+                        ],
+                        'cflags': ['-mfpxx'],
+                      }],
+                      ['mips_fpu_mode=="fp32"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FP32',
+                        ],
+                        'cflags': ['-mfp32'],
+                      }],
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips32r2'],
+                      }],
+                    ],
+                    'cflags': ['-mips32r2'],
+                    'ldflags': ['-mips32r2'],
+                  }],
+                  ['mips_arch_variant=="r1"', {
+                    'defines': [
+                      'FPU_MODE_FP32',
+                    ],
+                    'cflags!': ['-mfp64', '-mfpxx'],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips32'],
+                      }],
+                    ],
+                    'cflags': ['-mips32'],
+                    'ldflags': ['-mips32'],
+                  }],
+                  ['mips_arch_variant=="rx"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32RX',
+                      'FPU_MODE_FPXX',
+                    ],
+                    'cflags!': ['-mfp64', '-mfp32'],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips32'],
+                      }],
+                    ],
+                    'cflags': ['-mips32', '-mfpxx'],
+                    'ldflags': ['-mips32'],
+                  }],
+                ],
+              }, {
+                # 'v8_target_arch!=target_arch'
+                # Target not built with an MIPS CXX compiler (simulator build).
+                'conditions': [
+                  ['mips_arch_variant=="r6"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R6',
+                      'FPU_MODE_FP64',
+                    ],
+                  }],
+                  ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                    'defines': [ '_MIPS_MSA' ],
+                  }],
+                  ['mips_arch_variant=="r2"', {
+                    'conditions': [
+                      [ 'mips_fpu_mode=="fp64"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FP64',
+                        ],
+                      }],
+                      ['mips_fpu_mode=="fpxx"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FPXX',
+                        ],
+                      }],
+                      ['mips_fpu_mode=="fp32"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FP32',
+                        ],
+                      }],
+                    ],
+                  }],
+                  ['mips_arch_variant=="r1"', {
+                    'defines': [
+                      'FPU_MODE_FP32',
+                    ],
+                  }],
+                  ['mips_arch_variant=="rx"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32RX',
+                      'FPU_MODE_FPXX',
+                    ],
+                  }],
+                ],
+              }],
+            ],
+          }],  #_toolset=="target"
+          ['_toolset=="host"', {
+            'conditions': [
+              ['mips_arch_variant=="rx"', {
+                'defines': [
+                  '_MIPS_ARCH_MIPS32RX',
+                  'FPU_MODE_FPXX',
+                ],
+              }],
+              ['mips_arch_variant=="r6"', {
+                'defines': [
+                  '_MIPS_ARCH_MIPS32R6',
+                  'FPU_MODE_FP64',
+                ],
+              }],
+              ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                'defines': [ '_MIPS_MSA' ],
+              }],
+              ['mips_arch_variant=="r2"', {
+                'conditions': [
+                  ['mips_fpu_mode=="fp64"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R2',
+                      'FPU_MODE_FP64',
+                    ],
+                  }],
+                  ['mips_fpu_mode=="fpxx"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R2',
+                      'FPU_MODE_FPXX',
+                    ],
+                  }],
+                  ['mips_fpu_mode=="fp32"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R2',
+                      'FPU_MODE_FP32'
+                    ],
+                  }],
+                ],
+              }],
+              ['mips_arch_variant=="r1"', {
+                'defines': ['FPU_MODE_FP32',],
+              }],
+            ]
+          }],  #_toolset=="host"
+        ],
+      }],  # v8_target_arch=="mips"
+      ['v8_target_arch=="mipsel"', {
+        'defines': [
+          'V8_TARGET_ARCH_MIPS',
+        ],
+        'conditions': [
+          [ 'v8_can_use_fpu_instructions=="true"', {
+            'defines': [
+              'CAN_USE_FPU_INSTRUCTIONS',
+            ],
+          }],
+          [ 'v8_use_mips_abi_hardfloat=="true"', {
+            'defines': [
+              '__mips_hard_float=1',
+              'CAN_USE_FPU_INSTRUCTIONS',
+            ],
+          }, {
+            'defines': [
+              '__mips_soft_float=1'
+            ],
+          }],
+        ],
+        'target_conditions': [
+          ['_toolset=="target"', {
+            'conditions': [
+              ['v8_target_arch==target_arch', {
+                # Target built with a Mips CXX compiler.
+                'cflags': [
+                  '-EL',
+                  '-Wno-error=array-bounds',  # Workaround https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56273
+                ],
+                'ldflags': ['-EL'],
+                'conditions': [
+                  [ 'v8_use_mips_abi_hardfloat=="true"', {
+                    'cflags': ['-mhard-float'],
+                    'ldflags': ['-mhard-float'],
+                  }, {
+                    'cflags': ['-msoft-float'],
+                    'ldflags': ['-msoft-float'],
+                  }],
+                  ['mips_arch_variant=="r6"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R6',
+                      'FPU_MODE_FP64',
+                    ],
+                    'cflags!': ['-mfp32', '-mfpxx'],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips32r6'],
+                      }],
+                    ],
+                    'cflags': ['-mips32r6'],
+                    'ldflags': ['-mips32r6'],
+                  }],
+                  ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                    'defines': [ '_MIPS_MSA' ],
+                  }],
+                  ['mips_arch_variant=="r2"', {
+                    'conditions': [
+                      [ 'mips_fpu_mode=="fp64"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FP64',
+                        ],
+                        'cflags': ['-mfp64'],
+                      }],
+                      ['mips_fpu_mode=="fpxx"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FPXX',
+                        ],
+                        'cflags': ['-mfpxx'],
+                      }],
+                      ['mips_fpu_mode=="fp32"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FP32',
+                        ],
+                        'cflags': ['-mfp32'],
+                      }],
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips32r2'],
+                      }],
+                    ],
+                    'cflags': ['-mips32r2'],
+                    'ldflags': ['-mips32r2'],
+                  }],
+                  ['mips_arch_variant=="r1"', {
+                    'defines': [
+                      'FPU_MODE_FP32',
+                    ],
+                    'cflags!': ['-mfp64', '-mfpxx'],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips32'],
+                      }],
+                    ],
+                    'cflags': ['-mips32'],
+                    'ldflags': ['-mips32'],
+                  }],
+                  ['mips_arch_variant=="rx"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32RX',
+                      'FPU_MODE_FPXX',
+                    ],
+                    'cflags!': ['-mfp64', '-mfp32'],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips32'],
+                      }],
+                    ],
+                    'cflags': ['-mips32', '-mfpxx'],
+                    'ldflags': ['-mips32'],
+                  }],
+                  ['mips_arch_variant=="loongson"', {
+                    'defines': [
+                      '_MIPS_ARCH_LOONGSON',
+                      'FPU_MODE_FP32',
+                    ],
+                    'cflags!': ['-mfp64', '-mfpxx'],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips3'],
+                      }],
+                    ],
+                    'cflags': ['-mips3', '-mfp32'],
+                  }],
+                ],
+              }, {
+                # 'v8_target_arch!=target_arch'
+                # Target not built with an MIPS CXX compiler (simulator build).
+                'conditions': [
+                  ['mips_arch_variant=="r6"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R6',
+                      'FPU_MODE_FP64',
+                    ],
+                  }],
+                  ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                    'defines': [ '_MIPS_MSA' ],
+                  }],
+                  ['mips_arch_variant=="r2"', {
+                    'conditions': [
+                      [ 'mips_fpu_mode=="fp64"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FP64',
+                        ],
+                      }],
+                      ['mips_fpu_mode=="fpxx"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FPXX',
+                        ],
+                      }],
+                      ['mips_fpu_mode=="fp32"', {
+                        'defines': [
+                          '_MIPS_ARCH_MIPS32R2',
+                          'FPU_MODE_FP32',
+                        ],
+                      }],
+                    ],
+                  }],
+                  ['mips_arch_variant=="r1"', {
+                    'defines': [
+                      'FPU_MODE_FP32',
+                    ],
+                  }],
+                  ['mips_arch_variant=="rx"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32RX',
+                      'FPU_MODE_FPXX',
+                    ],
+                  }],
+                  ['mips_arch_variant=="loongson"', {
+                    'defines': [
+                      '_MIPS_ARCH_LOONGSON',
+                      'FPU_MODE_FP32',
+                    ],
+                  }],
+                ],
+              }],
+            ],
+          }], #_toolset=="target
+          ['_toolset=="host"', {
+            'conditions': [
+              ['mips_arch_variant=="rx"', {
+                'defines': [
+                  '_MIPS_ARCH_MIPS32RX',
+                  'FPU_MODE_FPXX',
+                ],
+              }],
+              ['mips_arch_variant=="r6"', {
+                'defines': [
+                  '_MIPS_ARCH_MIPS32R6',
+                  'FPU_MODE_FP64',
+                ],
+              }],
+              ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                'defines': [ '_MIPS_MSA' ],
+              }],
+              ['mips_arch_variant=="r2"', {
+                'conditions': [
+                  ['mips_fpu_mode=="fp64"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R2',
+                      'FPU_MODE_FP64',
+                    ],
+                  }],
+                  ['mips_fpu_mode=="fpxx"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R2',
+                      'FPU_MODE_FPXX',
+                    ],
+                  }],
+                  ['mips_fpu_mode=="fp32"', {
+                    'defines': [
+                      '_MIPS_ARCH_MIPS32R2',
+                      'FPU_MODE_FP32'
+                    ],
+                  }],
+                ],
+              }],
+              ['mips_arch_variant=="r1"', {
+                'defines': ['FPU_MODE_FP32',],
+              }],
+              ['mips_arch_variant=="loongson"', {
+                'defines': [
+                  '_MIPS_ARCH_LOONGSON',
+                  'FPU_MODE_FP32',
+                ],
+              }],
+            ]
+          }],
+        ],
+      }],  # v8_target_arch=="mipsel"
+      ['v8_target_arch=="mips64el" or v8_target_arch=="mips64"', {
+        'defines': [
+          'V8_TARGET_ARCH_MIPS64',
+        ],
+        'conditions': [
+          [ 'v8_can_use_fpu_instructions=="true"', {
+            'defines': [
+              'CAN_USE_FPU_INSTRUCTIONS',
+            ],
+          }],
+          [ 'v8_host_byteorder=="little"', {
+            'defines': [
+              'V8_TARGET_ARCH_MIPS64_LE',
+            ],
+          }],
+          [ 'v8_host_byteorder=="big"', {
+            'defines': [
+              'V8_TARGET_ARCH_MIPS64_BE',
+            ],
+          }],
+          [ 'v8_use_mips_abi_hardfloat=="true"', {
+            'defines': [
+              '__mips_hard_float=1',
+              'CAN_USE_FPU_INSTRUCTIONS',
+            ],
+          }, {
+            'defines': [
+              '__mips_soft_float=1'
+            ],
+          }],
+         ],
+        'target_conditions': [
+          ['_toolset=="target"', {
+            'conditions': [
+              ['v8_target_arch==target_arch', {
+                'cflags': [
+                  '-Wno-error=array-bounds',  # Workaround https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56273
+                ],
+                'conditions': [
+                  ['v8_target_arch=="mips64el"', {
+                    'cflags': ['-EL'],
+                    'ldflags': ['-EL'],
+                  }],
+                  ['v8_target_arch=="mips64"', {
+                    'cflags': ['-EB'],
+                    'ldflags': ['-EB'],
+                  }],
+                  [ 'v8_use_mips_abi_hardfloat=="true"', {
+                    'cflags': ['-mhard-float'],
+                    'ldflags': ['-mhard-float'],
+                  }, {
+                    'cflags': ['-msoft-float'],
+                    'ldflags': ['-msoft-float'],
+                  }],
+                  ['mips_arch_variant=="r6"', {
+                    'defines': ['_MIPS_ARCH_MIPS64R6',],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips64r6'],
+                      }],
+                    ],
+                    'cflags': ['-mips64r6', '-mabi=64'],
+                    'ldflags': ['-mips64r6', '-mabi=64'],
+                  }],
+                  ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                    'defines': [ '_MIPS_MSA' ],
+                  }],
+                  ['mips_arch_variant=="r2"', {
+                    'defines': ['_MIPS_ARCH_MIPS64R2',],
+                    'conditions': [
+                      [ 'clang==0', {
+                        'cflags': ['-Wa,-mips64r2'],
+                      }],
+                    ],
+                    'cflags': ['-mips64r2', '-mabi=64'],
+                    'ldflags': ['-mips64r2', '-mabi=64'],
+                  }],
+                ],
+              }, {
+                # 'v8_target_arch!=target_arch'
+                # Target not built with an MIPS CXX compiler (simulator build).
+                'conditions': [
+                  ['mips_arch_variant=="r6"', {
+                    'defines': ['_MIPS_ARCH_MIPS64R6',],
+                  }],
+                  ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                    'defines': [ '_MIPS_MSA' ],
+                  }],
+                  ['mips_arch_variant=="r2"', {
+                    'defines': ['_MIPS_ARCH_MIPS64R2',],
+                  }],
+                ],
+              }],
+            ],
+          }],  #'_toolset=="target"
+          ['_toolset=="host"', {
+            'conditions': [
+              ['mips_arch_variant=="r6"', {
+                'defines': ['_MIPS_ARCH_MIPS64R6',],
+              }],
+              ['mips_arch_variant=="r6" and mips_use_msa==1', {
+                'defines': [ '_MIPS_MSA' ],
+              }],
+              ['mips_arch_variant=="r2"', {
+                'defines': ['_MIPS_ARCH_MIPS64R2',],
+              }],
+            ],
+          }],  #'_toolset=="host"
+        ],
+      }],  # v8_target_arch=="mips64el"
+      ['v8_target_arch=="x64"', {
+        'defines': [
+          'V8_TARGET_ARCH_X64',
+        ],
+        'xcode_settings': {
+          'ARCHS': [ 'x86_64' ],
+        },
+        'msvs_settings': {
+          'VCLinkerTool': {
+            'StackReserveSize': '2097152',
+          },
+        },
+        'msvs_configuration_platform': 'x64',
+      }],  # v8_target_arch=="x64"
+      ['v8_target_arch=="x32"', {
+        'defines': [
+          # x32 port shares the source code with x64 port.
+          'V8_TARGET_ARCH_X64',
+          'V8_TARGET_ARCH_32_BIT',
+        ],
+        'cflags': [
+          '-mx32',
+          # Inhibit warning if long long type is used.
+          '-Wno-long-long',
+        ],
+        'ldflags': [
+          '-mx32',
+        ],
+      }],  # v8_target_arch=="x32"
+      ['linux_use_gold_flags==1', {
+        # Newer gccs and clangs support -fuse-ld, use the flag to force gold
+        # selection.
+        # gcc -- http://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/Optimize-Options.html
+        'ldflags': [ '-fuse-ld=gold', ],
+      }],
+      ['linux_use_bundled_binutils==1', {
+        'cflags': [
+          '-B<!(cd <(DEPTH) && pwd -P)/<(binutils_dir)',
+        ],
+      }],
+      ['linux_use_bundled_gold==1', {
+        # Put our binutils, which contains gold in the search path. We pass
+        # the path to gold to the compiler. gyp leaves unspecified what the
+        # cwd is when running the compiler, so the normal gyp path-munging
+        # fails us. This hack gets the right path.
+        'ldflags': [
+          '-B<!(cd <(DEPTH) && pwd -P)/<(binutils_dir)',
+        ],
+      }],
+      ['OS=="win"', {
+        'defines': [
+          'WIN32',
+          'NOMINMAX',  # Refs: https://chromium-review.googlesource.com/c/v8/v8/+/1456620
+        ],
+        # 4351: VS 2005 and later are warning us that they've fixed a bug
+        #       present in VS 2003 and earlier.
+        'msvs_disabled_warnings': [4351],
+        'msvs_configuration_attributes': {
+          'CharacterSet': '1',
+        },
+      }],
+      ['OS=="win" and v8_target_arch=="ia32"', {
+        'msvs_settings': {
+          'VCCLCompilerTool': {
+            # Ensure no surprising artifacts from 80bit double math with x86.
+            'AdditionalOptions': ['/arch:SSE2'],
+          },
+        },
+      }],
+      ['OS=="win" and v8_enable_prof==1', {
+        'msvs_settings': {
+          'VCLinkerTool': {
+            'GenerateMapFile': 'true',
+          },
+        },
+      }],
+      ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
+         or OS=="netbsd" or OS=="mac" or OS=="android" or OS=="qnx") and \
+        v8_target_arch=="ia32"', {
+        'cflags': [
+          '-msse2',
+          '-mfpmath=sse',
+          '-mmmx',  # Allows mmintrin.h for MMX intrinsics.
+        ],
+      }],
+      ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
+         or OS=="netbsd" or OS=="mac" or OS=="android" or OS=="qnx") and \
+        (v8_target_arch=="arm" or v8_target_arch=="ia32" or \
+         v8_target_arch=="mips" or v8_target_arch=="mipsel" or \
+         v8_target_arch=="ppc" or v8_target_arch=="s390")', {
+        'target_conditions': [
+          ['_toolset=="host"', {
+            'conditions': [
+              ['host_cxx_is_biarch==1', {
+                'conditions': [
+                  ['host_arch=="s390" or host_arch=="s390x"', {
+                    'cflags': [ '-m31' ],
+                    'ldflags': [ '-m31' ]
+                  },{
+                   'cflags': [ '-m32' ],
+                   'ldflags': [ '-m32' ]
+                  }],
+                ],
+              }],
+            ],
+            'xcode_settings': {
+              'ARCHS': [ 'i386' ],
+            },
+          }],
+          ['_toolset=="target"', {
+            'conditions': [
+              ['target_cxx_is_biarch==1', {
+                'conditions': [
+                  ['host_arch=="s390" or host_arch=="s390x"', {
+                    'cflags': [ '-m31' ],
+                    'ldflags': [ '-m31' ]
+                  },{
+                   'cflags': [ '-m32' ],
+                   'ldflags': [ '-m32' ],
+                  }],
+                ],
+              }],
+            ],
+            'xcode_settings': {
+              'ARCHS': [ 'i386' ],
+            },
+          }],
+        ],
+      }],
+      ['(OS=="linux" or OS=="android") and \
+        (v8_target_arch=="x64" or v8_target_arch=="arm64" or \
+         v8_target_arch=="ppc64" or v8_target_arch=="s390x")', {
+        'target_conditions': [
+          ['_toolset=="host"', {
+            'conditions': [
+              ['host_cxx_is_biarch==1', {
+                'cflags': [ '-m64' ],
+                'ldflags': [ '-m64' ]
+              }],
+             ],
+           }],
+           ['_toolset=="target"', {
+             'conditions': [
+               ['target_cxx_is_biarch==1', {
+                 'cflags': [ '-m64' ],
+                 'ldflags': [ '-m64' ],
+               }],
+             ]
+           }],
+         ],
+      }],
+      ['OS=="android" and v8_android_log_stdout==1', {
+        'defines': [
+          'V8_ANDROID_LOG_STDOUT',
+        ],
+      }],
+      ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
+         or OS=="netbsd" or OS=="qnx" or OS=="aix"', {
+        'conditions': [
+          [ 'v8_no_strict_aliasing==1', {
+            'cflags': [ '-fno-strict-aliasing' ],
+          }],
+        ],  # conditions
+      }],
+      ['OS=="solaris"', {
+        'defines': [ '__C99FEATURES__=1' ],  # isinf() etc.
+      }],
+      ['OS=="freebsd" or OS=="openbsd"', {
+        'cflags': [ '-I/usr/local/include' ],
+      }],
+      ['OS=="netbsd"', {
+        'cflags': [ '-I/usr/pkg/include' ],
+      }],
+      ['OS=="aix"', {
+        'defines': [
+          # Support for malloc(0)
+          '_LINUX_SOURCE_COMPAT=1',
+          '__STDC_FORMAT_MACROS',
+          '_ALL_SOURCE=1'],
+        'conditions': [
+          [ 'v8_target_arch=="ppc"', {
+            'ldflags': [ '-Wl,-bmaxdata:0x60000000/dsa' ],
+          }],
+          [ 'v8_target_arch=="ppc64"', {
+            'cflags': [ '-maix64', '-fdollars-in-identifiers' ],
+            'ldflags': [ '-maix64 -Wl,-bbigtoc' ],
+          }],
+        ],
+      }],
+    ],  # conditions
+    'configurations': {
+      'Debug': {
+        'defines': [
+          'ENABLE_DISASSEMBLER',
+          'V8_ENABLE_CHECKS',
+          'OBJECT_PRINT',
+          'VERIFY_HEAP',
+          'DEBUG',
+          'V8_TRACE_MAPS',
+          'V8_ENABLE_ALLOCATION_TIMEOUT',
+          'V8_ENABLE_FORCE_SLOW_PATH',
+        ],
+        'conditions': [
+          ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" or \
+            OS=="qnx" or OS=="aix"', {
+            'cflags': [ '-Woverloaded-virtual', '<(wno_array_bounds)', ],
+          }],
+          ['OS=="linux" and v8_enable_backtrace==1', {
+            # Support for backtrace_symbols.
+            'ldflags': [ '-rdynamic' ],
+          }],
+          ['OS=="linux" and disable_glibcxx_debug==0', {
+            # Enable libstdc++ debugging facilities to help catch problems
+            # early, see http://crbug.com/65151 .
+            'defines': ['_GLIBCXX_DEBUG=1',],
+          }],
+          ['OS=="aix"', {
+            'ldflags': [ '-Wl,-bbigtoc' ],
+            'conditions': [
+              ['v8_target_arch=="ppc64"', {
+                'cflags': [ '-maix64 -mcmodel=large' ],
+              }],
+            ],
+          }],
+          ['OS=="android"', {
+            'variables': {
+              'android_full_debug%': 1,
+            },
+            'conditions': [
+              ['android_full_debug==0', {
+                # Disable full debug if we want a faster v8 in a debug build.
+                # TODO(2304): pass DISABLE_DEBUG_ASSERT instead of hiding DEBUG.
+                'defines!': [
+                  'DEBUG',
+                  'ENABLE_SLOW_DCHECKS',
+                ],
+              }],
+            ],
+          }],
+          ['linux_use_gold_flags==1', {
+            'target_conditions': [
+              ['_toolset=="target"', {
+                'ldflags': [
+                  # Experimentation found that using four linking threads
+                  # saved ~20% of link time.
+                  # https://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/281527606915bb36
+                  # Only apply this to the target linker, since the host
+                  # linker might not be gold, but isn't used much anyway.
+                  '-Wl,--threads',
+                  '-Wl,--thread-count=4',
+                ],
+              }],
+            ],
+          }],
+          ['v8_optimized_debug==0', {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'Optimization': '0',
+                'conditions': [
+                  ['component=="shared_library" or force_dynamic_crt==1', {
+                    'RuntimeLibrary': '3',  # /MDd
+                  }, {
+                     'RuntimeLibrary': '1',  # /MTd
+                   }],
+                ],
+              },
+              'VCLinkerTool': {
+                'LinkIncremental': '2',
+              },
+            },
+            'variables': {
+              'v8_enable_slow_dchecks%': 1,
+            },
+            'conditions': [
+              ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" or \
+            OS=="qnx" or OS=="aix"', {
+                'cflags!': [
+                  '-O3',
+                  '-O2',
+                  '-O1',
+                  '-Os',
+                ],
+                'cflags': [
+                  '-fdata-sections',
+                  '-ffunction-sections',
+                ],
+              }],
+              ['OS=="mac"', {
+                'xcode_settings': {
+                  'GCC_OPTIMIZATION_LEVEL': '0',  # -O0
+                },
+              }],
+              ['v8_enable_slow_dchecks==1', {
+                'defines': [
+                  'ENABLE_SLOW_DCHECKS',
+                ],
+              }],
+            ],
+          }, {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'Optimization': '2',
+                'InlineFunctionExpansion': '2',
+                'EnableIntrinsicFunctions': 'true',
+                'FavorSizeOrSpeed': '0',
+                'StringPooling': 'true',
+                'BasicRuntimeChecks': '0',
+                'conditions': [
+                  ['component=="shared_library" or force_dynamic_crt==1', {
+                    'RuntimeLibrary': '3',  #/MDd
+                  }, {
+                     'RuntimeLibrary': '1',  #/MTd
+                   }],
+                ],
+              },
+              'VCLinkerTool': {
+                'LinkIncremental': '1',
+                'OptimizeReferences': '2',
+                'EnableCOMDATFolding': '2',
+              },
+            },
+            'variables': {
+              'v8_enable_slow_dchecks%': 0,
+            },
+            'conditions': [
+              ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" or \
+            OS=="qnx" or OS=="aix"', {
+                'cflags!': [
+                  '-O0',
+                  '-O1',
+                  '-Os',
+                ],
+                'cflags': [
+                  '-fdata-sections',
+                  '-ffunction-sections',
+                ],
+                'conditions': [
+                  # Don't use -O3 with sanitizers.
+                  ['asan==0 and msan==0 and lsan==0 \
+                and tsan==0 and ubsan==0 and ubsan_vptr==0', {
+                    'cflags': ['-O3'],
+                    'cflags!': ['-O2'],
+                  }, {
+                     'cflags': ['-O2'],
+                     'cflags!': ['-O3'],
+                   }],
+                ],
+              }],
+              ['OS=="mac"', {
+                'xcode_settings': {
+                  'GCC_OPTIMIZATION_LEVEL': '3',  # -O3
+                  'GCC_STRICT_ALIASING': 'YES',
+                },
+              }],
+              ['v8_enable_slow_dchecks==1', {
+                'defines': [
+                  'ENABLE_SLOW_DCHECKS',
+                ],
+              }],
+            ],
+          }],
+          # Temporary refs: https://github.com/nodejs/node/pull/23801
+          ['v8_enable_handle_zapping==1', {
+            'defines': ['ENABLE_HANDLE_ZAPPING',],
+          }],
+        ],
+
+      },  # DebugBaseCommon
+      'Release': {
+        'variables': {
+          'v8_enable_slow_dchecks%': 0,
+        },
+         # Temporary refs: https://github.com/nodejs/node/pull/23801
+        'defines!': ['ENABLE_HANDLE_ZAPPING',],
+        'conditions': [
+          ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" \
+            or OS=="aix"', {
+            'cflags!': [
+              '-Os',
+            ],
+            'cflags': [
+              '-fdata-sections',
+              '-ffunction-sections',
+              '<(wno_array_bounds)',
+            ],
+            'conditions': [
+              # Don't use -O3 with sanitizers.
+              ['asan==0 and msan==0 and lsan==0 \
+                and tsan==0 and ubsan==0 and ubsan_vptr==0', {
+                'cflags': ['-O3'],
+                'cflags!': ['-O2'],
+              }, {
+                'cflags': ['-O2'],
+                'cflags!': ['-O3'],
+              }],
+            ],
+          }],
+          ['OS=="android"', {
+            'cflags!': [
+              '-O3',
+              '-Os',
+            ],
+            'cflags': [
+              '-fdata-sections',
+              '-ffunction-sections',
+              '-O2',
+            ],
+          }],
+          ['OS=="mac"', {
+            'xcode_settings': {
+              'GCC_OPTIMIZATION_LEVEL': '3',  # -O3
+
+              # -fstrict-aliasing.  Mainline gcc
+              # enables this at -O2 and above,
+              # but Apple gcc does not unless it
+              # is specified explicitly.
+              'GCC_STRICT_ALIASING': 'YES',
+            },
+          }],  # OS=="mac"
+          ['OS=="win"', {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'Optimization': '2',
+                'InlineFunctionExpansion': '2',
+                'EnableIntrinsicFunctions': 'true',
+                'FavorSizeOrSpeed': '0',
+                'StringPooling': 'true',
+                'conditions': [
+                  ['component=="shared_library" or force_dynamic_crt==1', {
+                    'RuntimeLibrary': '2',  #/MD
+                  }, {
+                    'RuntimeLibrary': '0',  #/MT
+                  }],
+                ],
+              },
+              'VCLinkerTool': {
+                'LinkIncremental': '1',
+                'OptimizeReferences': '2',
+                'EnableCOMDATFolding': '2',
+              },
+            },
+          }],  # OS=="win"
+          ['v8_enable_slow_dchecks==1', {
+            'defines': [
+              'ENABLE_SLOW_DCHECKS',
+            ],
+          }],
+        ],  # conditions
+      },  # Release
+    },  # configurations
+    'cflags!': [ '-Wall', '-Wextra' ],
+    'msvs_disabled_warnings': [
+      4245,  # Conversion with signed/unsigned mismatch.
+      4267,  # Conversion with possible loss of data.
+      4324,  # Padding structure due to alignment.
+      4351,
+      4355,
+      4701,  # Potentially uninitialized local variable.
+      4702,  # Unreachable code.
+      4703,  # Potentially uninitialized local pointer variable.
+      4709,  # Comma operator within array index expr (bugged).
+      4714,  # Function marked forceinline not inlined.
+
+      # MSVC assumes that control can get past an exhaustive switch and then
+      # warns if there's no return there (see https://crbug.com/v8/7658)
+      4715,  # Not all control paths return a value.
+
+      4718,  # Recursive call has no side-effect.
+      4723,  # https://crbug.com/v8/7771
+      4724,  # https://crbug.com/v8/7771
+      4800,  # Forcing value to bool.
+    ],
+  },  # target_defaults
+}