[tools] Build generator script

infra/mb/mb_config.pyl

 # Copyright 2016 The V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   # This is a map of buildbot master names -> buildbot builder names ->
   # config names (where each config name is a key in the 'configs' dict,
   # below). MB uses this dict to look up which config to use for a given bot.
   # Bots are ordered by appearance on waterfall.
   'masters': {
+    'developer_default': {
+      'x64.debug': 'default_debug_x64',
+      'x64.optdebug': 'default_optdebug_x64',
+      'x64.release': 'default_release_x64',
+      'x86.debug': 'default_debug_x86',
+      'x86.optdebug': 'default_optdebug_x86',
+      'x86.release': 'default_release_x86',
+    },
+
     'client.dart.fyi': {
       'v8-linux-release': 'gyp_release_x86_disassembler',
       'v8-win-release': 'gyp_release_x86_disassembler',
       'v8-mac-release': 'gyp_release_x86_disassembler',
     },
     'client.dynamorio': {
       'linux-v8-dr': 'gyp_release_x64',
     },
     'client.v8': {
       # Linux.
@@ skipping 151 matching lines @@
       'v8_linux_mipsel_compile_rel': 'gyp_release_simulate_mipsel',
       'v8_linux_mips64el_compile_rel': 'gyp_release_simulate_mips64el',
       'v8_android_arm_compile_rel': 'gyp_release_android_arm',
     },
   },
 
 
   # To ease readability, config values are ordered by:
   # gyp/gn, release/debug, arch type, other values alphabetically.
   'configs': {
+    # Developer default configs.
+    'default_debug_x64': [
+      'gn', 'debug', 'x64', 'v8_enable_slow_dchecks', 'v8_full_debug'],
+    'default_optdebug_x64': [
+      'gn', 'debug', 'x64', 'v8_enable_slow_dchecks'],
+    'default_release_x64': [
+      'gn', 'release', 'x64'],
+    'default_debug_x86': [
+      'gn', 'debug', 'x86', 'v8_enable_slow_dchecks', 'v8_full_debug'],
+    'default_optdebug_x86': [
+      'gn', 'debug', 'x86', 'v8_enable_slow_dchecks'],
+    'default_release_x86': [
+      'gn', 'release', 'x86'],
+
+
     # GN release configs for x64.
     'gn_release_x64': [
       'gn', 'release_bot', 'x64', 'swarming'],
     'gn_release_x64_internal': [
       'gn', 'release_bot', 'x64', 'swarming', 'v8_snapshot_internal'],
     'gn_release_x64_trybot': [
       'gn', 'release_trybot', 'x64', 'swarming'],
 
     # GN debug configs for x64.
     'gn_debug_x64': [
@@ skipping 438 matching lines @@
       'gn_args': 'target_cpu="x64"',
       'gyp_defines': 'target_arch=x64',
     },
 
     'x86': {
       'gn_args': 'target_cpu="x86"',
       'gyp_defines': 'target_arch=ia32',
     },
   },
 }