Enable whole-program vtable opt when CFI is enabled.

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 447 matching lines @@
     }
 
     # Allows the linker to apply ICF to the LTO object file. Also, when
     # targeting ARM, without this flag, LTO produces a .text section that is
     # larger than the maximum call displacement, preventing the linker from
     # relocating calls (http://llvm.org/PR22999).
     if (is_linux) {
       ldflags += [ "-Wl,-plugin-opt,-function-sections" ]
     }
 
-    # TODO(pcc): Make these flags work correctly with CFI.
-    if (!is_cfi) {
-      cflags += [ "-fwhole-program-vtables" ]
-      ldflags += [ "-fwhole-program-vtables" ]
-    }
+    cflags += [ "-fwhole-program-vtables" ]
+    ldflags += [ "-fwhole-program-vtables" ]
   }
 
   # Pass the same C/C++ flags to the objective C/C++ compiler.
   cflags_objc += cflags_c
   cflags_objcc += cflags_cc
 
   # Assign any flags set for the C compiler to asmflags so that they are sent
   # to the assembler. The Windows assembler takes different types of flags
   # so only do so for posix platforms.
   if (is_posix) {
@@ skipping 1080 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
   }
 }