Protobuf: Move thread-local global data to globals.cc

third_party/protobuf/README.chromium

 Name: Protocol Buffers
 Short Name: protobuf
 URL: https://github.com/google/protobuf
 License: BSD
 License File: LICENSE
 Version: 3.0.0-beta-3
 Revision: 3470b6895aa659b7559ed678e029a5338e535f14
 Security Critical: yes
 
 Steps used to create the current version:
@@ skipping 11 matching lines @@
    it to protobuf/third_party/six/six.py.
 4. Apply patches in patches/ (see the description below):
 
    $ for patch in patches/*; do patch -s -p1 < $patch; done
 
    For future releases, it will be worth looking into which patches still need
    to be applied.
 5. Extract all globals to src/google/protobuf/globals.cc and prefix these
    symbols with 'cr_'.  On Linux, the command
 
-   $ objdump -t -j.data -j.bss obj/third_party/protobuf/libprotobuf_lite.a
+   $ objdump -t -j.data -j.bss -j.tdata -j.tbss \
+     obj/third_party/protobuf/libprotobuf_lite.a
 
    should produce the output
 
+   objdump: section '.tbss' mentioned in a -j option, but not found in any input file
+   objdump: section '.tdata' mentioned in a -j option, but not found in any input file
    objdump: section '.bss' mentioned in a -j option, but not found in any input file
    objdump: section '.data' mentioned in a -j option, but not found in any input file
 
    This will require updating 0012-extract-globals.patch.
 6. Generate descriptor_pb2.py using something like the following steps. Make
    sure you've regenerated your buildfiles and will build protoc from the
    newly-modified sources above.
 
    $ cd $SRC_DIR
    $ ninja -C out/Debug protoc
@@ skipping 42 matching lines @@
 
   Fixed in https://github.com/google/protobuf/pull/1549
 
 - 0012-extract-globals.patch
 
   Fixes https://crbug.com/700120.  Moves everything that would have
   gotten linked into .data or .bss sections into globals.cc so that
   Chromium may build a shared library containing just protobuf
   globals.  Also prefixes every symbol with 'cr_' to avoid conflicting
   with symbols from the system protobuf.