[Chromecast] Don't export symbols from libffmpeg.a

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 4113 matching lines @@
                       # And using '-mcpu=cortex-a9' should be sufficient.
                       '-mcpu=cortex-a9',
                       '-funwind-tables',
                       # Breakpad requires symbols with debugging information
                       '-g',
                     ],
                     'ldflags': [
                       # We want to statically link libstdc++/libgcc.
                       '-static-libstdc++',
                       '-static-libgcc',
+                      # Don't allow visible symbols from libraries that contain
+                      # assembly code with symbols that aren't hidden properly.
+                      # http://b/26390825
+                      '-Wl,--exclude-libs=libffmpeg.a',
                     ],
                     'cflags!': [
                       # Some components in Chromium (e.g. v8, skia, ffmpeg)
                       # define their own cflags for arm builds that could
                       # conflict with the flags we set here (e.g.
                       # '-mcpu=cortex-a9'). Remove these flags explicitly.
                       '-march=armv7-a',
                       '-mtune=cortex-a8',
                     ],
                     'target_conditions': [
@@ skipping 2232 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }