Adds ability to build for asan with gn

build/sanitizers/BUILD.gn

Index: build/sanitizers/BUILD.gn
diff --git a/build/sanitizers/BUILD.gn b/build/sanitizers/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..8d0044207b53fb48e2b45cf4cfabffef0fca279d
--- /dev/null
+++ b/build/sanitizers/BUILD.gn
@@ -0,0 +1,22 @@
+# 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.
+
+group("options") {

[brettw, 2014/10/28 16:59:13]

Can you put this file in //build/config/sanitizers instead? I've been putting
all GN stuff in only build/config and build/toolchain to keep it separate from
the rest of the build mess.

+  public_configs = [ ":sanitizer_options_link_helper" ]
+  deps = [ ":options_sources" ]
+}
+
+config("sanitizer_options_link_helper") {
+  ldflags = [ "-Wl,-u_sanitizer_options_link_helper", "-fsanitize=address" ]
+}
+
+source_set("options_sources") {
+  visibility = [ ":options" ]
+  sources = [ "sanitizer_options.cc" ]
+  include_dirs = [ "../.." ]

[brettw, 2014/10/28 16:59:13]

Use absolute paths. Actually, isn't this the root path? That should already be
implicit so I think you can delete this.

+
+  if (is_tsan) {
+    sources += [ "tsan_suppressions.cc" ]
+  }
+}