Build: disable icf for gcc builds with bundled gold

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 3cf72220237662772be19973c54a9c9de54012fd..1550c0d75308a8028d48af3607207aa53fb18b4a 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -86,6 +86,10 @@ declare_args() {
   # TODO(brettw) it's weird that Mac and desktop Linux are different. We should
   # explore favoring size over speed in this case as well.
   optimize_for_size = is_android || is_ios
+
+  # Gold icf level, values are "none", "safe", "all". If value isn't overridden,
+  # default initialization is below.
+  gold_icf_level = ""
 }
 
 # Apply the default logic for these values if they were not set explicitly.
@@ -103,6 +107,16 @@ if (use_debug_fission == "default") {
                       linux_use_bundled_binutils && cc_wrapper == ""
 }
 
+if (gold_icf_level == "") {
+  if (use_gold && !is_clang) {
+    # Gold doesn't respect section alignment and breaks gcc builds with icf
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=576197
+    gold_icf_level = "none"
+  } else {
+    gold_icf_level = "all"

[Dirk Pranke, 2016/04/15 21:20:55]

I think you need to actually use this, also? I don't see any other reference to
a gold_icf_level in the GN buildfiles, so it might still need to be ported.

[Lukasz Jagielski, 2016/04/19 17:01:48]

Done.

+  }
+}
+
 # default_include_dirs ---------------------------------------------------------
 #
 # This is a separate config so that third_party code (which would not use the