[iOS/GN] Fix generation of .dSYM for fat binary builds.

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/ios/ios_sdk.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.
 #
 # This is applied to BOTH desktop Mac and iOS targets.
 config("compiler") {
   # These flags are shared between the C compiler and linker.
   common_mac_flags = []
@@ skipping 80 matching lines @@
   ldflags = [ "-Wl,-pie" ]  # Position independent.
 }
 
 # The ldflags referenced below are handled by
 # //build/toolchain/mac/linker_driver.py.
 # 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) {
+  if (enable_stripping && (!is_ios || additional_toolchains == [])) {

[Robert Sesek, 2016/07/18 20:09:42]

Considering making |!is_ios || additional_toolchains == []| a variable, given
that it's a bit unwieldy to reason about.

[sdefresne, 2016/07/19 09:12:12]

Done.

     ldflags = [ "-Wcrl,strip,-x,-S" ]
   }
 }