[Mac/GN] Add a new linker_driver.py option to save unstripped linker output.

build/config/mac/BUILD.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.
 
 import("//build/config/sysroot.gni")
 import("//build/config/mac/mac_sdk.gni")
 import("//build/config/mac/symbols.gni")
 
 # This is included by reference in the //build/config/compiler config that
 # is applied to all targets. It is here to separate out the logic.
@@ skipping 78 matching lines @@
     ]
   }
 }
 
 # On Mac, this is used only for executables.
 config("mac_executable_flags") {
   # Remove this when targeting >=10.7 since it is the default in that config.
   ldflags = [ "-Wl,-pie" ]  # Position independent.
 }
 
-# The ldflags referenced below are handled by
-# //build/toolchain/mac/linker_driver.py.
+# The ldflags referenced below are handled by //build/toolchain/mac/linker_driver.py.

[Mark Mentovai, 2016/07/15 19:24:17]

This was wrapped before, why not now?

[Robert Sesek, 2016/07/15 20:50:22]

Don't know what happened, but fixed.

+
 # Remove this config if a target wishes to change the arguments passed to the
 # strip command during linking. This config by default strips all symbols
 # from a binary, but some targets may wish to specify a saves file to preserve
 # specific symbols.
 config("strip_all") {
   if (enable_stripping) {
     ldflags = [ "-Wcrl,strip,-x,-S" ]
   }
 }
+
+# This config will keep unstripped copies of the linker output.
+config("save_unstripped_output") {
+  if (save_unstripped_output) {
+    ldflags = [ "-Wcrl,unstripped," + rebase_path(root_out_dir) ]
+  }
+}