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diff --git a/third_party/libwebrtc/build/config/nacl/BUILD.gn b/third_party/libwebrtc/build/config/nacl/BUILD.gn
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+# Copyright (c) 2014 The Native Client 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/nacl/config.gni")
+
+# Native Client Definitions
+config("nacl_defines") {
+ if (is_linux || is_chromeos || is_android || is_nacl) {
+ defines = [
+ "_POSIX_C_SOURCE=199506",
+ "_XOPEN_SOURCE=600",
+ "_GNU_SOURCE=1",
+ "__STDC_LIMIT_MACROS=1",
+ ]
+ } else if (is_win) {
+ defines = [ "__STDC_LIMIT_MACROS=1" ]
+ }
+
+ if (target_cpu == "pnacl" && !is_nacl_nonsfi) {
+ # TODO: Remove the following definition once NACL_BUILD_ARCH and
+ # NACL_BUILD_SUBARCH are defined by the PNaCl toolchain.
+ defines += [ "NACL_BUILD_ARCH=pnacl" ]
+ }
+}
+
+config("nexe_defines") {
+ defines = [
+ "DYNAMIC_ANNOTATIONS_ENABLED=1",
+ "DYNAMIC_ANNOTATIONS_PREFIX=NACL_",
+ ]
+}
+
+config("nacl_warnings") {
+ if (is_win) {
+ # Some NaCl code uses forward declarations of static const variables,
+ # with initialized definitions later on. (The alternative would be
+ # many, many more forward declarations of everything used in that
+ # const variable's initializer before the definition.) The Windows
+ # compiler is too stupid to notice that there is an initializer later
+ # in the file, and warns about the forward declaration.
+ cflags = [ "/wd4132" ]
+ }
+}
+
+# The base target that all targets in the NaCl build should depend on.
+# This allows configs to be modified for everything in the NaCl build, even when
+# the NaCl build is composed into the Chrome build. (GN has no functionality to
+# add flags to everything in //native_client, having a base target works around
+# that limitation.)
+source_set("nacl_base") {
+ public_configs = [
+ ":nacl_defines",
+ ":nacl_warnings",
+ ]
+ if (current_os == "nacl") {
+ public_configs += [ ":nexe_defines" ]
+ }
+}
+
+config("compiler") {
+ configs = []
+ cflags = []
+ ldflags = []
+ libs = []
+
+ if (is_clang && target_cpu != "pnacl") {
+ # -no-integrated-as is the default in nacl-clang for historical
+ # compatibility with inline assembly code and so forth. But there
+ # are no such cases in Chromium code, and -integrated-as is nicer in
+ # general. Moreover, the IRT must be built using LLVM's assembler
+ # on x86-64 to preserve sandbox base address hiding. Use it
+ # everywhere for consistency (and possibly quicker builds).
+ cflags += [ "-integrated-as" ]
+ }
+ if (is_nacl_nonsfi) {
+ cflags += [ "--pnacl-allow-translate" ]
+ ldflags += [
+ "--pnacl-allow-translate",
+ "--pnacl-allow-native",
+ "-Wl,--noirt",
+ "-Wt,--noirt",
+ "-Wt,--noirtshim",
+
+ # The clang driver automatically injects -lpthread when using libc++, but
+ # the toolchain doesn't have it yet. To get around this, use
+ # -nodefaultlibs and make each executable target depend on
+ # "//native_client/src/nonsfi/irt:nacl_sys_private".
+ "-nodefaultlibs",
+ ]
+ libs += [
+ "c++",
+ "m",
+ "c",
+ "pnaclmm",
+ ]
+ include_dirs = [ "//native_client/src/public/linux_syscalls" ]
+ }
+
+ asmflags = cflags
+}
+
+config("compiler_codegen") {
+ cflags = []
+
+ if (is_nacl_irt) {
+ cflags += [
+ # A debugger should be able to unwind IRT call frames. This is
+ # the default behavior on x86-64 and when compiling C++ with
+ # exceptions enabled; the change is for the benefit of x86-32 C.
+ # The frame pointer is unnecessary when unwind tables are used.
+ "-fasynchronous-unwind-tables",
+ "-fomit-frame-pointer",
+ ]
+
+ if (target_cpu == "x86") {
+ # The x86-32 IRT needs to be callable with an under-aligned
+ # stack; so we disable SSE instructions, which can fault on
+ # misaligned addresses. See
+ # https://code.google.com/p/nativeclient/issues/detail?id=3935
+ cflags += [
+ "-mstackrealign",
+ "-mno-sse",
+ ]
+ }
+ }
+
+ asmflags = cflags
+}
+
+config("irt_optimize") {
+ cflags = [
+ # Optimize for space, keep the IRT nexe small.
+ "-Os",
+
+ # These are omitted from non-IRT libraries to keep the libraries
+ # themselves small.
+ "-ffunction-sections",
+ "-fdata-sections",
+ ]
+
+ ldflags = [ "-Wl,--gc-sections" ]
+}