[Mac/GN] Compile with -fno-standalone-debug if enable_dsyms=true.

build/config/compiler/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/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 1469 matching lines @@
       # Tell VS 2015+ to create a PDB that references debug
       # information in .obj and .lib files instead of copying
       # it all. This flag is incompatible with /PROFILE
       ldflags = [ "/DEBUG:FASTLINK" ]
     } else {
       ldflags = [ "/DEBUG" ]
     }
   } else {
     if (is_mac || is_ios) {
       cflags = [ "-gdwarf-2" ]
+      if (enable_dsyms) {

[Dirk Pranke, 2016/06/27 23:44:57]

you need to import("//build/config/mac/symbols.gni") first.

Or, probably better, just get rid of mac/symbols.gni and move those two args
into compiler.gni since you end up having to include both of them regardless.

+        # If generating dSYMs, specify -fno-standalone-debug. This was
+        # originally specified for https://crbug.com/479841 because dsymutil
+        # could not handle a 4GB dSYM file. But dsymutil from Xcodes prior to
+        # version 7 also produce debug data that is incompatible with Breakpad

[Mark Mentovai, 2016/06/27 23:43:46]

produces

+        # dump_syms, so this is still required (https://crbug.com/622406).
+        cflags += [ "-fno-standalone-debug" ]
+      }
     } else {
       cflags = [ "-g2" ]
     }
     if (use_debug_fission) {
       cflags += [ "-gsplit-dwarf" ]
     }
     asmflags = cflags
     ldflags = []
   }
 }
@@ skipping 44 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }