use icf=safe w/ gcc+gold+x86/x64, icf=all w/ gold elsewhere.

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 332 matching lines @@
     ldflags += [ "-fuse-ld=bfd" ]
   } else if (is_android && current_cpu == "mipsel" && is_clang) {
     # Let clang find the ld.bfd in the NDK.
     _rebased_android_toolchain_root =
         rebase_path(android_toolchain_root, root_build_dir)
     ldflags += [ "--gcc-toolchain=$rebased_android_toolchain_root" ]
   }
 
   if (is_posix && (use_gold || (use_lld && !is_nacl)) && !using_sanitizer &&
       !(is_android && use_order_profiling)) {
-    ldflags += [ "-Wl,--icf=all" ]
+    # TODO(crbug.com/576197) - gcc on x86 platforms + gold + icf=all
+    # doesn't currently work. Once it does, use icf=all everywhere.
+    if (is_clang || (target_cpu != "x86" && target_cpu != "x64")) {
+      ldflags += [ "-Wl,--icf=all" ]
+    } else {
+      ldflags += [ "-Wl,--icf=safe" ]
+    }
   }
 
   if (linux_use_bundled_binutils) {
     cflags += [ "-B$binutils_path" ]
   }
 
   # Clang-specific compiler flags setup.
   # ------------------------------------
   if (is_clang) {
     cflags += [ "-fcolor-diagnostics" ]
@@ skipping 1104 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
   }
 }