Print backtraces on FATAL log messages in debug mode.

build/common.gypi

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     # .gyp files 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.
@@ skipping 240 matching lines @@
             'variables': {
               'debug_optimize%': '0',
             },
             'defines': [
               '_DEBUG',
             ],
             'cflags': [
               '-O<(debug_optimize)',
               '-g',
             ],
-          },
+            'ldflags': [
+              '-rdynamic',  # Allows backtrace to resolve symbols.
+            ],
+          },
           'Release': {
             'cflags': [
               '-O2',
               # 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',
@@ skipping 104 matching lines @@
           'VCLinkerTool': {
             'AdditionalOptions':
               '/safeseh /dynamicbase /ignore:4199 /ignore:4221 /nxcompat',
             'AdditionalDependencies': [
               'wininet.lib',
               'version.lib',
               'msimg32.lib',
               'ws2_32.lib',
               'usp10.lib',
               'psapi.lib',
+              'dbghelp.lib',
             ],
             'AdditionalLibraryDirectories':
               '<(DEPTH)/third_party/platformsdk_win2008_6_1/files/Lib',
-            'DelayLoadDLLs': 'dwmapi.dll,uxtheme.dll',
+            'DelayLoadDLLs': 'dbghelp.dll,dwmapi.dll,uxtheme.dll',
             'GenerateDebugInformation': 'true',
             'MapFileName': '$(OutDir)\\$(TargetName).map',
             'ImportLibrary': '$(OutDir)\\lib\\$(TargetName).lib',
             'TargetMachine': '1',
             'FixedBaseAddress': '1',
           },
           'VCMIDLTool': {
             'GenerateStublessProxies': 'true',
             'TypeLibraryName': '$(InputName).tlb',
             'OutputDirectory': '$(IntDir)',
@@ skipping 28 matching lines @@
     # 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',
   },
 }