Move libc++ and libc++abi to buildtools.

third_party/libc++/libc++.gyp

-# Copyright 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.
-
-{
-  'targets': [
-    {
-      'target_name': 'libcxx_proxy',
-      'type': 'none',
-      'dependencies=': [
-        'libc++',
-      ],
-      # Do not add dependency on libc++.so to dependents of this target. We
-      # don't want to pass libc++.so on the command line to the linker, as that
-      # would cause it to be linked into C executables which don't need it.
-      # Instead, we supply -stdlib=libc++ and let the clang driver decide.
-      'dependencies_traverse': 0,
-      'variables': {
-        # Don't add this target to the dependencies of targets with type=none.
-        'link_dependency': 1,
-      },
-      'all_dependent_settings': {
-        'target_conditions': [
-          ['_type!="none"', {
-            'include_dirs': [
-              'trunk/include',
-              '../libc++abi/trunk/include',
-            ],
-            'cflags_cc': [
-              '-nostdinc++',
-            ],
-            'ldflags': [
-              '-stdlib=libc++',
-              # Normally the generator takes care of RPATH. Our case is special
-              # because the generator is unaware of the libc++.so dependency.
-              # Note that setting RPATH here is a potential security issue. See:
-              # https://code.google.com/p/gyp/issues/detail?id=315
-              '-Wl,-R,\$$ORIGIN/lib/',
-            ],
-            'library_dirs': [
-              '<(PRODUCT_DIR)/lib/',
-            ],
-          }],
-        ],
-      },
-    },
-    {
-      'target_name': 'libc++',
-      'type': 'shared_library',
-      'dependencies=': [
-        # libc++abi is linked statically into libc++.so. This allows us to get
-        # both libc++ and libc++abi by passing '-stdlib=libc++'. If libc++abi
-        # was a separate DSO, we'd have to link against it explicitly.
-        '../libc++abi/libc++abi.gyp:libc++abi',
-      ],
-      'sources': [
-        'trunk/src/algorithm.cpp',
-        'trunk/src/bind.cpp',
-        'trunk/src/chrono.cpp',
-        'trunk/src/condition_variable.cpp',
-        'trunk/src/debug.cpp',
-        'trunk/src/exception.cpp',
-        'trunk/src/future.cpp',
-        'trunk/src/hash.cpp',
-        'trunk/src/ios.cpp',
-        'trunk/src/iostream.cpp',
-        'trunk/src/locale.cpp',
-        'trunk/src/memory.cpp',
-        'trunk/src/mutex.cpp',
-        'trunk/src/new.cpp',
-        'trunk/src/optional.cpp',
-        'trunk/src/random.cpp',
-        'trunk/src/regex.cpp',
-        'trunk/src/shared_mutex.cpp',
-        'trunk/src/stdexcept.cpp',
-        'trunk/src/string.cpp',
-        'trunk/src/strstream.cpp',
-        'trunk/src/system_error.cpp',
-        'trunk/src/thread.cpp',
-        'trunk/src/typeinfo.cpp',
-        'trunk/src/utility.cpp',
-        'trunk/src/valarray.cpp',
-      ],
-      'include_dirs': [
-        'trunk/include',
-        '../libc++abi/trunk/include',
-      ],
-      'cflags': [
-        '-fstrict-aliasing',
-        '-nostdinc++',
-        '-std=c++11',
-      ],
-      'cflags_cc!': [
-        '-fno-exceptions',
-        '-fno-rtti',
-      ],
-      'cflags!': [
-        '-fvisibility=hidden',
-      ],
-      'ldflags': [
-        '-nodefaultlibs',
-      ],
-      'ldflags!': [
-        # This somehow causes a warning from clang about an unused compilation
-        # option. Use '-lpthread' instead.
-        # TODO(earthdok): find out what's causing the warning.
-        '-pthread',
-      ],
-      'libraries': [
-        '-lc',
-        '-lgcc_s',
-        '-lpthread',
-        '-lrt',
-      ],
-    },
-  ]
-}