Make __DATE__, __TIME__ and __TIMESTAMP__ to evaluate to an empty string.

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 162 matching lines @@
     ":compiler_cpu_abi",
     ":compiler_codegen",
   ]
 
   # In general, Windows is totally different, but all the other builds share
   # some common GCC configuration.
   if (!is_win) {
     # Common GCC compiler flags setup.
     # --------------------------------
     cflags += [ "-fno-strict-aliasing" ]  # See http://crbug.com/32204
+
+    # Eliminate build metadata (__DATE__, __TIME__ and __TIMESTAMP__) for
+    # deterministic build.  See https://crbug.com/314403
+    cflags += [
+      "-Wno-builtin-macro-redefined",
+      "-D__DATE__=",
+      "-D__TIME__=",
+      "-D__TIMESTAMP__=",
+    ]
+

[Nico, 2017/01/31 01:27:56]

Don't we want this on Windows too?

[Yoshisato Yanagisawa, 2017/02/01 07:56:50]

Done.

     cflags_cc += [
       # If this is removed then remove the corresponding /Zc:threadSafeInit- for
       # Windows.
       "-fno-threadsafe-statics",
 
       # Not exporting C++ inline functions can generally be applied anywhere
       # so we do so here. Normal function visibility is controlled by
       # //build/config/gcc:symbol_visibility_hidden.
       "-fvisibility-inlines-hidden",
     ]
@@ skipping 1486 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
   }
 }