Enable symbols with ASan

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 2440 matching lines @@
         # goma doesn't support pch yet.
         'chromium_win_pch': 0,
         # goma doesn't support PDB yet, so win_z7=1 or fastbuild=1.
         'conditions': [
           ['win_z7==0 and fastbuild==0', {
             'fastbuild': 1,
           }],
         ],
       }],
 
-      ['OS=="win" and clang==1', {
+      ['OS=="win" and clang==1 and asan==0', {
         # TODO(thakis): Remove this again once building with clang/win and
         # debug info doesn't make link.exe run for hours.
         'fastbuild': 1,
       }],
 
-
       ['host_clang==1', {
         'host_cc': '<(make_clang_dir)/bin/clang',
         'host_cxx': '<(make_clang_dir)/bin/clang++',
       }, {
         'host_cc': '<!(which gcc)',
         'host_cxx': '<!(which g++)',
       }],
 
       # The seccomp-bpf sandbox is only supported on five architectures
       # currently.
@@ skipping 3441 matching lines @@
                   },
                 }],
                 ['asan==1', {
                   # TODO(asan/win): Move this down into the general
                   # win-target_defaults section once the 64-bit asan runtime
                   # exists.  See crbug.com/345874.
                   'VCCLCompilerTool': {
                     'AdditionalOptions': [
                       '-fsanitize=address',
                       '-fsanitize-blacklist=<(PRODUCT_DIR)/../../tools/memory/asan/blacklist_win.txt',
+                      # Omit variable info to speed up /Z7 links.
+                      '-gline-tables-only',
                     ],
                     'AdditionalIncludeDirectories': [
                       # MSVC needs to be able to find the sanitizer headers when
                       # invoked via /fallback. This is critical for using macros
                       # like ASAN_UNPOISON_MEMORY_REGION in files where we fall
                       # back.
                       '<(DEPTH)/<(make_clang_dir)/lib/clang/<!(python <(DEPTH)/tools/clang/scripts/update.py --print-clang-version)/include_sanitizer',
                     ],
                   },
                   'VCLinkerTool': {
@@ skipping 441 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',
   },
 }