build: add --debug-symbols to build with -g without enabling DCHECKs

This is useful when debugging release builds on Linux without
enabling DCHECKs.

Author: joyeecheung

configure.py

@@ -107,6 +107,12 @@
     default=None,
     help='build the Node.js part of the binary with debugging symbols')
 
+parser.add_argument('--debug-symbols',
+    action='store_true',
+    dest='debug_symbols',
+    default=None,
+    help='add debugging symbols to release builds (adds -g without enabling DCHECKs)')
+
 parser.add_argument('--dest-cpu',
     action='store',
     dest='dest_cpu',
@@ -1560,6 +1566,9 @@ def configure_node(o):
   o['variables']['control_flow_guard'] = b(options.enable_cfg)
   o['variables']['node_use_amaro'] = b(not options.without_amaro)
   o['variables']['debug_node'] = b(options.debug_node)
+  o['variables']['debug_symbols'] = b(options.debug_symbols)
+  if options.debug_symbols:
+    o['cflags'] += ['-g']
   o['variables']['build_type%'] = 'Debug' if options.debug else 'Release'
   o['default_configuration'] = 'Debug' if options.debug else 'Release'
   if options.error_on_warn and options.suppress_all_error_on_warn: