Graceful failure in SerializeToArray().

Update build file locations.

Fixes https://github.com/bazelbuild/bazel/issues/5383.

Fix incorrect link.

Make proto_api target visible

Migrate to supported version of http_archive

Fixes #4727.

Java: Mark sun.misc dependency as optional

Fix unused parameter warnings in generated code with arenas enabled

Inspect is used five times on line 65-74 without being imported.

Remove cycle in dependency graph

See https://github.com/tensorflow/tensorflow/issues/19657 for
motivation. But long story short, without this change:

m.SerializeToArray(buffer, m.ByteSizeLong());

would result in a CHECK failure if m.ByteSizeLong() returned a value
>2GB.

* Align Bazel on Windows with CMake's MSVC flags

* Update code to work for Xcode 10b

* Update README and test scripts to mention that Xcode 7 is no longer supported

Add proto2 to proto3 util

Introduce Proto C API; based on cl/198113115 by amauryfa

Add reference to protobuf-d

https://github.com/dcarp/protobuf-d is a conformance tested proto3
runtime library and code generator for D.

* Remove js_embed binary.

Upport to master: Require C++11 and pass -std=c++11

This commit updates the Autotools build to require a C++11 compiler and
explicitly pass -std=c++11. This seems to be necessary for enabling
C++11 support in older compilers.

Added Clang thread-safety annotations in mutex.h

For Clang's thread safety analysis (-Wthread-safety) to pass without warnings,
we need to annotate WrappedMutex to indicate that Lock() acquires the lock and
Unlock() releases it. This CL adds the annotations and guards them with an
ifdef to make sure they're a no-op on compilers other than Clang.

This is a cherry-pick of a change I already made to the Google-internal
codebase.

Updated generate_changelog.py

Merge 3.5.x branch into master

Added new API to GPBEnumDescriptor to enable introspection of enum values.

Refactored implementation so that this contains a minimum of added code.

Clarified comments regarding behavior in the presence of the alias_allowed option.

Added unit tests for new functionality and for the alias case.

These methods are used by grpc

Remove jruby from kokoro tests

Declare 'google' namespace when importing Python protobuf via Bazel