Enable unwind-support for all non-official builds

build/common.gypi

 # Copyright (c) 2012 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.
 
 # 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.
@@ skipping 1094 matching lines @@
     'profiling%': '0',
     # Profile without optimizing out stack frames when profiling==1.
     'profiling_full_stack_frames%': '0',
 
     # And if we want to dump symbols for Breakpad-enabled builds.
     'linux_dump_symbols%': 0,
     # And if we want to strip the binary after dumping symbols.
     'linux_strip_binary%': 0,
     # Strip the test binaries needed for Linux reliability tests.
     'linux_strip_reliability_tests%': 0,
+    # If we want stack unwind support for backtrace().
+    'unwind_tables%': 1,
 
     # Enable TCMalloc.
     'linux_use_tcmalloc%': 1,
     'android_use_tcmalloc%': 0,
 
     # Set to 1 to link against libgnome-keyring instead of using dlopen().
     'linux_link_gnome_keyring%': 0,
     # Set to 1 to link against gsettings APIs instead of using dlopen().
     'linux_link_gsettings%': 0,
 
@@ skipping 157 matching lines @@
             'linux_use_tcmalloc%': 0,
           }],
           ['OS=="linux" and target_arch=="mipsel"', {
             'sysroot%': '<(sysroot)',
             'CXX%': '<(CXX)',
           }],
           # All Chrome builds have breakpad symbols, but only process the
           # symbols from official builds.
           ['(branding=="Chrome" and buildtype=="Official")', {
             'linux_dump_symbols%': 1,
+
+            # Omit unwind support in official builds to save space. We can use
+            # breakpad for these builds.
+            'unwind_tables%': 0,
           }],
         ],
       }],  # os_posix==1 and OS!="mac" and OS!="ios"
       ['OS=="ios"', {
         'disable_nacl%': 1,
         'enable_background%': 0,
         'enable_task_manager%': 0,
         'icu_use_data_file_flag%': 1,
         'use_system_libxml%': 1,
         'use_system_sqlite%': 1,
@@ skipping 1768 matching lines @@
                 ],
                 'conditions' : [
                   ['profiling_full_stack_frames==1', {
                     'cflags': [
                       '-fno-inline',
                       '-fno-optimize-sibling-calls',
                     ],
                   }],
                 ],
               }],
-              # Can be omitted to reduce output size. Does not seem to affect
-              # crash reporting.
-              ['target_arch=="ia32"', {
-                'cflags': [
-                  '-fno-unwind-tables',
-                  '-fno-asynchronous-unwind-tables',
-                ],
-              }],
             ],
           },
         },
         'conditions': [
           ['target_arch=="ia32"', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'asflags': [
                   # Needed so that libs with .s files (e.g. libicudata.a)
                   # are compatible with the general 32-bit-ness.
@@ skipping 457 matching lines @@
                   ['_toolset=="target"', {
                     'ldflags': [
                       # Workaround for linker OOM.
                       '-Wl,--no-keep-memory',
                     ],
                   }],
                 ],
               }],
             ],
           }],
+          ['unwind_tables==1', {
+            'cflags': ['-funwind-tables'],
+          }, {
+            'cflags': ['-fno-unwind-tables', '-fno-asynchronous-unwind-tables'],
+          }],
           ['linux_use_tcmalloc==0 and android_use_tcmalloc==0', {
             'defines': ['NO_TCMALLOC'],
           }],
           ['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
@@ skipping 1218 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',
   },
 }