Adds ability to build for asan with gn

build/config/BUILDCONFIG.gn

 # Copyright (c) 2013 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.
 
 # =============================================================================
 # BUILD FLAGS
 # =============================================================================
 #
 # This block lists input arguments to the build, along with their default
 # values. GN requires listing them explicitly so it can validate input and have
@@ skipping 463 matching lines @@
 
 # Test defaults.
 set_defaults("test") {
   if (is_android) {
     configs = _shared_library_configs
   } else {
     configs = _executable_configs
   }
 }
 
+if (is_asan) {
+  sanitizer_deps = [ "//build/sanitizers:options" ]

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

I think we would want this in a .gni file. But actually I had a better idea.
Just delete this and add a dep the sanitizer helper target directly. Then define
that target to be nothing when no sanitizer is enabled. I think this will look
cleaner in the deps list.

I feel like we should also change the name of the target then, so it makes the
most possible sense from the target depending on it. Maybe
//build/config/sanitizers:deps or something?

+} else {
+  sanitizer_deps = []
+}
+
 
 # ==============================================================================
 # TOOLCHAIN SETUP
 # ==============================================================================
 #
 # Here we set the default toolchain, as well as the variable host_toolchain
 # which will identify the toolchain corresponding to the local system when
 # doing cross-compiles. When not cross-compiling, this will be the same as the
 # default toolchain.
 
@@ skipping 67 matching lines @@
       if (defined(invoker.allow_circular_includes_from)) { allow_circular_includes_from = invoker.allow_circular_includes_from }
       if (defined(invoker.cflags)) { cflags = invoker.cflags }
       if (defined(invoker.cflags_c)) { cflags_c = invoker.cflags_c }
       if (defined(invoker.cflags_cc)) { cflags_cc = invoker.cflags_cc }
       if (defined(invoker.cflags_objc)) { cflags_objc = invoker.cflags_objc }
       if (defined(invoker.cflags_objcc)) { cflags_objcc = invoker.cflags_objcc }
       if (defined(invoker.check_includes)) { check_includes = invoker.check_includes }
       if (defined(invoker.data)) { data = invoker.data }
       if (defined(invoker.datadeps)) { datadeps = invoker.datadeps }
       if (defined(invoker.defines)) { defines = invoker.defines }
-      if (defined(invoker.deps)) { deps = invoker.deps }
+      if (defined(invoker.deps)) {
+        deps = invoker.deps + sanitizer_deps
+      } else {
+        deps = sanitizer_deps
+      }
       if (defined(invoker.direct_dependent_configs)) { direct_dependent_configs = invoker.direct_dependent_configs }
       if (defined(invoker.forward_dependent_configs_from)) { forward_dependent_configs_from = invoker.forward_dependent_configs_from }
       if (defined(invoker.include_dirs)) { include_dirs = invoker.include_dirs }
       if (defined(invoker.ldflags)) { ldflags = invoker.ldflags }
       if (defined(invoker.lib_dirs)) { lib_dirs = invoker.lib_dirs }
       if (defined(invoker.libs)) { libs = invoker.libs }
       if (defined(invoker.output_extension)) { output_extension = invoker.output_extension }
       if (defined(invoker.output_name)) { output_name = invoker.output_name }
       if (defined(invoker.public)) { public = invoker.public }
       if (defined(invoker.public_configs)) { public_configs = invoker.public_configs }
@@ skipping 102 matching lines @@
       if (defined(invoker.allow_circular_includes_from)) { allow_circular_includes_from = invoker.allow_circular_includes_from }
       if (defined(invoker.cflags)) { cflags = invoker.cflags }
       if (defined(invoker.cflags_c)) { cflags_c = invoker.cflags_c }
       if (defined(invoker.cflags_cc)) { cflags_cc = invoker.cflags_cc }
       if (defined(invoker.cflags_objc)) { cflags_objc = invoker.cflags_objc }
       if (defined(invoker.cflags_objcc)) { cflags_objcc = invoker.cflags_objcc }
       if (defined(invoker.check_includes)) { check_includes = invoker.check_includes }
       if (defined(invoker.data)) { data = invoker.data }
       if (defined(invoker.datadeps)) { datadeps = invoker.datadeps }
       if (defined(invoker.defines)) { defines = invoker.defines }
-      if (defined(invoker.deps)) { deps = invoker.deps }
+      if (defined(invoker.deps)) {
+        deps = invoker.deps + sanitizer_deps
+      } else {
+        deps = sanitizer_deps
+      }
       if (defined(invoker.direct_dependent_configs)) { direct_dependent_configs = invoker.direct_dependent_configs }
       if (defined(invoker.forward_dependent_configs_from)) { forward_dependent_configs_from = invoker.forward_dependent_configs_from }
       if (defined(invoker.include_dirs)) { include_dirs = invoker.include_dirs }
       if (defined(invoker.ldflags)) { ldflags = invoker.ldflags }
       if (defined(invoker.lib_dirs)) { lib_dirs = invoker.lib_dirs }
       if (defined(invoker.libs)) { libs = invoker.libs }
       if (defined(invoker.output_extension)) { output_extension = invoker.output_extension }
       if (defined(invoker.output_name)) { output_name = invoker.output_name }
       if (defined(invoker.public)) { public = invoker.public }
       if (defined(invoker.public_configs)) { public_configs = invoker.public_configs }
       if (defined(invoker.public_deps)) { public_deps = invoker.public_deps }
       if (defined(invoker.sources)) { sources = invoker.sources }
       if (defined(invoker.visibility)) { visibility = invoker.visibility }
     }
   }
 }