Disable compilation symbols on goma builds

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 @@
 # default config and then adding the named one you want:
 #
 #   configs -= [ "//build/config/compiler:default_symbols" ]
 #   configs += [ "//build/config/compiler:symbols" ]
 
 # Full symbols.
 config("symbols") {
   if (is_win) {
     import("//build/toolchain/goma.gni")
     if (use_goma) {
-      cflags = [ "/Z7" ]  # No PDB file
+      # Disable symbols during goma compilation because otherwise the redundant
+      # debug information (repeated in every .obj file) makes linker memory
+      # consumption and link times unsustainable (crbug.com/630074).
+      cflags = []

[Dirk Pranke, 2016/07/22 21:02:56]

The implication of this change is that you can no longer get a full symbol build
w/ goma, right? 

Maybe it would've been better to change it so that if use_goma=true,
symbol_level defaults to 1 ?

That would also make things more consistent w/ what we do on the builders, which
would be nice.

It also looks like we might need /z7 for SyzygyASAN (we'll have to check w/
Sébastien).

     } else {
       cflags = [ "/Zi" ]  # Produce PDB file, no edit and continue.
     }
     if (is_win_fastlink && visual_studio_version != "2013") {
       # 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" ]
@@ skipping 66 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
   }
 }