Various fixes for 32-bit Linux GN builds that need to be tracked down.

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/toolchain/ccache.gni")
 
 if (current_cpu == "arm") {
@@ skipping 26 matching lines @@
   # example, don't omit the frame pointer and leave in symbols.
   enable_profiling = false
 
   # Compile in such a way as to make it possible for the profiler to unwind full
   # stack frames. Setting this flag has a large effect on the performance of the
   # generated code than just setting profiling, but gives the profiler more
   # information to analyze.
   # Requires profiling to be set to true.
   enable_full_stack_frames_for_profiling = false
 
-  # Use 64-bit gold for linking on both 64-bit Linux and 32-bit linux;
-  # 32-bit Gold runs out of address-space on 32-bit bit builds.
-  use_gold = is_linux && (current_cpu == "x64" || current_cpu == "x86")
+  # TODO(GYP): We should be using 64-bit gold for linking on both 64-bit Linux
+  # and 32-bit linux; 32-bit Gold runs out of address-space on 32-bit builds.
+  # However, something isn't quite working right on the 32-bit builds.
+  use_gold = is_linux && current_cpu == "x64"

[Roland McGrath, 2015/09/21 23:59:07]

I investigated the gold crash a bit.  It still happens with upstream trunk of
gold.  I posted on binutils@sourceware.org about the details.
You can work around it by dropping the --icf=all flag.

 
   # When we are going to use gold we need to find it.
   if (use_gold) {
     gold_path = rebase_path("//third_party/binutils/Linux_x64/Release/bin",
                             root_build_dir)
   } else {
     gold_path = ""
   }
 
   # use_debug_fission: whether to use split DWARF debug info
@@ skipping 1427 matching lines @@
   } else if (symbol_level == 1) {
     cflags = minimal_symbols_cflags
     ldflags = minimal_symbols_ldflags
   } else if (symbol_level == 2) {
     cflags = symbols_cflags
     ldflags = symbols_ldflags
   } else {
     assert(false)
   }
 }