merge(3p/absl): subtree merge of Abseil up to e19260f r/1889

... notably, this includes Abseil's own StatusOr type, which
conflicted with our implementation (that was taken from TensorFlow).

Change-Id: Ie7d6764b64055caaeb8dc7b6b9d066291e6b538f

1 files changed, 5 insertions, 2 deletions

diff --git a/third_party/abseil_cpp/absl/base/internal/thread_identity.cc b/third_party/abseil_cpp/absl/base/internal/thread_identity.cc
index d63a04ae91..6ea010ed0d 100644
--- a/third_party/abseil_cpp/absl/base/internal/thread_identity.cc
+++ b/third_party/abseil_cpp/absl/base/internal/thread_identity.cc
@@ -23,6 +23,7 @@
 #include <cassert>
 #include <memory>
 
+#include "absl/base/attributes.h"
 #include "absl/base/call_once.h"
 #include "absl/base/internal/raw_logging.h"
 #include "absl/base/internal/spinlock.h"
@@ -53,9 +54,11 @@ void AllocateThreadIdentityKey(ThreadIdentityReclaimerFunction reclaimer) {
 // exist within a process (via dlopen() or similar), references to
 // thread_identity_ptr from each instance of the code will refer to
 // *different* instances of this ptr.
-#ifdef __GNUC__
+// Apple platforms have the visibility attribute, but issue a compile warning
+// that protected visibility is unsupported.
+#if ABSL_HAVE_ATTRIBUTE(visibility) && !defined(__APPLE__)
 __attribute__((visibility("protected")))
-#endif  // __GNUC__
+#endif  // ABSL_HAVE_ATTRIBUTE(visibility) && !defined(__APPLE__)
 #if ABSL_PER_THREAD_TLS
 // Prefer __thread to thread_local as benchmarks indicate it is a bit faster.
 ABSL_PER_THREAD_TLS_KEYWORD ThreadIdentity* thread_identity_ptr = nullptr;