Build libc++ biased bitcode.

pnacl/build.sh

 #!/bin/bash
 # Copyright (c) 2012 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.
 #
 #@                 PNaCl toolchain build script
 #@-------------------------------------------------------------------
 #@ This script builds the ARM and PNaCl untrusted toolchains.
 #@ It MUST be run from the native_client/ directory.
 ######################################################################
@@ skipping 441 matching lines @@
   libs-clean
   newlib portable
   newlib x86-64
   libs-support
   for arch in arm x86-32 x86-64 mips32; do
     dummy-irt-shim ${arch}
   done
   compiler-rt-all
   libgcc_eh-all
   lib-cpp ${LIB_CXX_NAME} portable
-  # Note: The libc++ build with biased bitcode is disabled because
-  # biased bitcode builds of the C++ standard library are only used to
-  # build the IRT, and the default is currently libstdc++ so the biased
-  # version of libc++ isn't used.
-  # lib-cpp ${LIB_CXX_NAME} x86-64
+  lib-cpp ${LIB_CXX_NAME} x86-64
   lib-cpp ${LIB_STDCPP_NAME} portable
   lib-cpp ${LIB_STDCPP_NAME} x86-64
 }
 
 #@ everything            - Build and install untrusted SDK. no translator
 everything() {
   sync-sources
   build-all
 }
 
@@ skipping 2958 matching lines @@
 
 if [ "$(type -t $1)" != "function" ]; then
   #Usage
   echo "ERROR: unknown function '$1'." >&2
   echo "For help, try:"
   echo "    $0 help"
   exit 1
 fi
 
 "$@"