Enable symbols with ASan

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/sanitizers/sanitizers.gni")
 
 # Contains the dependencies needed for sanitizers to link into executables and
 # shared_libraries. Unconditionally depend upon this target as it is empty if
@@ skipping 132 matching lines @@
 # This needs to be in a separate config so that targets can opt out of
 # sanitizers (by removing the config) if they desire. Even if a target
 # removes this config, executables & shared libraries should still depend on
 # :deps if any of their dependencies have not opted out of sanitizers.
 config("default_sanitizer_flags") {
   cflags = []
   cflags_cc = []
   defines = []
   configs = [ ":default_sanitizer_ldflags" ]
 
+  # 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 (is_clang && using_sanitizer) {
+    cflags += [ "-gline-tables-only" ]
+  }
+
   # Only works on Posix-like platforms.
   # FIXME: this is not true, remove the conditional.
   if (is_posix) {
     # Common options for AddressSanitizer, LeakSanitizer, ThreadSanitizer,
     # MemorySanitizer and non-official CFI builds.
     if (using_sanitizer || (is_lto && !is_official_build)) {
-      cflags += [
-        "-fno-omit-frame-pointer",
-        "-gline-tables-only",
-      ]
+      cflags += [ "-fno-omit-frame-pointer" ]
     }
     if (is_asan) {
       asan_blacklist_path =
           rebase_path("//tools/memory/asan/blacklist.txt", root_build_dir)
       cflags += [
         "-fsanitize=address",
         "-fsanitize-blacklist=$asan_blacklist_path",
       ]
       if (is_android) {
         # Android build relies on -Wl,--gc-sections removing unreachable code.
@@ skipping 149 matching lines @@
     sources = [
       "//third_party/llvm-build/Release+Asserts/compiler-rt/lib/darwin/libclang_rt.asan_osx_dynamic.dylib",
       "//third_party/llvm-build/Release+Asserts/compiler-rt/lib/darwin/libclang_rt.tsan_osx_dynamic.dylib",
       "//third_party/llvm-build/Release+Asserts/compiler-rt/lib/darwin/libclang_rt.ubsan_osx_dynamic.dylib",
     ]
     outputs = [
       "$root_build_dir/{{source_file_part}}",
     ]
   }
 }