[Mac/GN] Implement dSYM generation and stripping.

build/config/BUILDCONFIG.gn

Index: build/config/BUILDCONFIG.gn
diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index 92d0b6e12877497f30aafe083d2a08da38e4b4e7..341be421ff9adf7e8ca8ecf80d92a25b9e774827 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -508,6 +508,8 @@ if (is_win) {
     # that shouldn't use the windows subsystem.
     "//build/config/win:console",
   ]
+} else if (is_mac) {
+  _mac_linker_configs = [ "//build/config/mac:strip_all" ]

[Dirk Pranke, 2016/05/31 19:58:19]

It might make more sense to have a single generic
"//build/config/mac:linker_config" to encapsulate things a bit better (and keep
you from having to change BUILDCONFIG in the future).

[Robert Sesek, 2016/06/01 20:21:05]

If I do (in //build/config/mac/BUILD.gn):

config("linker_config") {
  configs = [ ":strip_all" ]
}

... then I can't seem to remove the individual strip_all config via
remove_configs.

[Dirk Pranke, 2016/06/01 21:16:54]

Yeah, I wasn't sure if that would work or not. Fair enough.

 }
 
 # Executable defaults.
@@ -517,6 +519,8 @@ _executable_configs = _native_compiler_configs + [
                       ]
 if (is_win) {
   _executable_configs += _windows_linker_configs
+} else if (is_mac) {
+  _executable_configs += _mac_linker_configs
 }
 set_defaults("executable") {
   configs = _executable_configs
@@ -540,6 +544,8 @@ if (is_win) {
   # want this can remove this config.
   _shared_library_configs +=
       [ "//build/config/android:hide_native_jni_exports" ]
+} else if (is_mac) {
+  _shared_library_configs += _mac_linker_configs
 }
 set_defaults("shared_library") {
   configs = _shared_library_configs