Abseil LTS 20200923

What's New:
* `absl::StatusOr<T>` has been released. See our [blog
  post](https://abseil.io/blog/2020-091021-status) for more
  information.
* Abseil Flags reflection interfaces have been released.
* Abseil Flags memory usage has been significantly optimized.
* Abseil now supports a "hardened" build mode. This build mode enables
  runtime checks that guard against programming errors that may lead
  to security vulnerabilities.

Notable Fixes:
* Sanitizer dynamic annotations like `AnnotateRWLockCreate` that are
  also defined by the compiler sanitizer implementation are no longer
  also defined by Abseil.
* Sanitizer macros are now prefixed with `ABSL_` to avoid naming collisions.
* Sanitizer usage is now automatically detected and no longer requires
  macros like `ADDRESS_SANITIZER` to be defined on the command line.

Breaking Changes:
* Abseil no longer contains a `dynamic_annotations` library. Users
  using a supported build system (Bazel or CMake) are unaffected by
  this, but users manually specifying link libraries may get an error
  about a missing linker input.

Baseline: 7680a5f8efe32de4753baadbd63e74e59d95bac1
Cherry picks: None

1 files changed, 0 insertions, 129 deletions

diff --git a/absl/base/dynamic_annotations.cc b/absl/base/dynamic_annotations.cc
deleted file mode 100644
index 21e822e5..00000000
--- a/absl/base/dynamic_annotations.cc
+++ /dev/null
@@ -1,129 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include <stdlib.h>
-#include <string.h>
-
-#include "absl/base/dynamic_annotations.h"
-
-#ifndef __has_feature
-#define __has_feature(x) 0
-#endif
-
-/* Compiler-based ThreadSanitizer defines
-   DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL = 1
-   and provides its own definitions of the functions. */
-
-#ifndef DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL
-# define DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL 0
-#endif
-
-/* Each function is empty and called (via a macro) only in debug mode.
-   The arguments are captured by dynamic tools at runtime. */
-
-#if DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0 && !defined(__native_client__)
-
-#if __has_feature(memory_sanitizer)
-#include <sanitizer/msan_interface.h>
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-void AnnotateRWLockCreate(const char *, int,
-                          const volatile void *){}
-void AnnotateRWLockDestroy(const char *, int,
-                           const volatile void *){}
-void AnnotateRWLockAcquired(const char *, int,
-                            const volatile void *, long){}
-void AnnotateRWLockReleased(const char *, int,
-                            const volatile void *, long){}
-void AnnotateBenignRace(const char *, int,
-                        const volatile void *,
-                        const char *){}
-void AnnotateBenignRaceSized(const char *, int,
-                             const volatile void *,
-                             size_t,
-                             const char *) {}
-void AnnotateThreadName(const char *, int,
-                        const char *){}
-void AnnotateIgnoreReadsBegin(const char *, int){}
-void AnnotateIgnoreReadsEnd(const char *, int){}
-void AnnotateIgnoreWritesBegin(const char *, int){}
-void AnnotateIgnoreWritesEnd(const char *, int){}
-void AnnotateEnableRaceDetection(const char *, int, int){}
-void AnnotateMemoryIsInitialized(const char *, int,
-                                 const volatile void *mem, size_t size) {
-#if __has_feature(memory_sanitizer)
-  __msan_unpoison(mem, size);
-#else
-  (void)mem;
-  (void)size;
-#endif
-}
-
-void AnnotateMemoryIsUninitialized(const char *, int,
-                                   const volatile void *mem, size_t size) {
-#if __has_feature(memory_sanitizer)
-  __msan_allocated_memory(mem, size);
-#else
-  (void)mem;
-  (void)size;
-#endif
-}
-
-static int GetRunningOnValgrind(void) {
-#ifdef RUNNING_ON_VALGRIND
-  if (RUNNING_ON_VALGRIND) return 1;
-#endif
-  char *running_on_valgrind_str = getenv("RUNNING_ON_VALGRIND");
-  if (running_on_valgrind_str) {
-    return strcmp(running_on_valgrind_str, "0") != 0;
-  }
-  return 0;
-}
-
-/* See the comments in dynamic_annotations.h */
-int RunningOnValgrind(void) {
-  static volatile int running_on_valgrind = -1;
-  int local_running_on_valgrind = running_on_valgrind;
-  /* C doesn't have thread-safe initialization of statics, and we
-     don't want to depend on pthread_once here, so hack it. */
-  ANNOTATE_BENIGN_RACE(&running_on_valgrind, "safe hack");
-  if (local_running_on_valgrind == -1)
-    running_on_valgrind = local_running_on_valgrind = GetRunningOnValgrind();
-  return local_running_on_valgrind;
-}
-
-/* See the comments in dynamic_annotations.h */
-double ValgrindSlowdown(void) {
-  /* Same initialization hack as in RunningOnValgrind(). */
-  static volatile double slowdown = 0.0;
-  double local_slowdown = slowdown;
-  ANNOTATE_BENIGN_RACE(&slowdown, "safe hack");
-  if (RunningOnValgrind() == 0) {
-    return 1.0;
-  }
-  if (local_slowdown == 0.0) {
-    char *env = getenv("VALGRIND_SLOWDOWN");
-    slowdown = local_slowdown = env ? atof(env) : 50.0;
-  }
-  return local_slowdown;
-}
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
-#endif  /* DYNAMIC_ANNOTATIONS_EXTERNAL_IMPL == 0 */