On asan/win bots building with goma, don't accidentally emit DWARF

build/config/sanitizers/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/clang/clang.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
 
@@ skipping 213 matching lines @@
 
 config("common_sanitizer_flags") {
   cflags = []
   cflags_cc = []
 
   # Sanitizers need line table info for stack traces. They don't need type info
   # or variable info, so we can leave that out to speed up the build.
   if (using_sanitizer) {
     assert(is_clang, "sanitizers only supported with clang")
     cflags += [ "-gline-tables-only" ]
+    if (is_win) {
+      # Just -gline-tables-only currently causes clang-cl to emit debug info
+      # in DWARF format.
+      # TODO(thakis): Remove this once we have a clang at LLVM r278139+
+      cflags += [ "/Z7" ]
+    }
   }
 
   # Common options for AddressSanitizer, LeakSanitizer, ThreadSanitizer,
   # MemorySanitizer and non-official CFI builds.
   if (using_sanitizer || (is_cfi && !is_official_build)) {
     if (is_posix) {
       cflags += [ "-fno-omit-frame-pointer" ]
     } else {
       cflags += [ "/Oy-" ]
     }
@@ skipping 249 matching lines @@
 # This allows to selectively disable ubsan_vptr, when needed. In particular,
 # if some third_party code is required to be compiled without rtti, which
 # is a requirement for ubsan_vptr.
 config("default_sanitizer_flags_but_ubsan_vptr") {
   configs = all_sanitizer_configs - [ ":ubsan_vptr_flags" ]
 }
 
 config("default_sanitizer_flags_but_coverage") {
   configs = all_sanitizer_configs - [ ":coverage_flags" ]
 }