From 2946ac0dea49c894215a998aebb19d2f1d942909 Mon Sep 17 00:00:00 2001
From: Pavel Samolysov <samolisov@gmail.com>
Date: Wed, 15 Apr 2020 00:25:55 +0300
Subject: Use base_internal::AtomicHook instead of std::atomic (#661)

* Use base_internal::AtomicHook instead of std::atomic

std::atomic has a broken implementation on the Windows platform and it
is not conform to the ABSL_CONST_INIT macro when clang-cl is used as a
compiler: the macro is expanded to the [[clang::require_constant_initialization]]
attribute and the attribute cannot be applied to the broken std::atomic.

Therefore, std::atomic has been replaced with absl::base_internal::AtomicHook
to fix the compilation error (thank Derek Mauro for the suggestion).

Issue: #659

Signed-off-by: Pavel Samolysov <samolisov@gmail.com>

* Update build files for pull request

Co-authored-by: Derek Mauro <dmauro@google.com>
---
 absl/status/BUILD.bazel               |  1 +
 absl/status/CMakeLists.txt            |  1 +
 absl/status/status_payload_printer.cc | 15 +++++----------
 3 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/absl/status/BUILD.bazel b/absl/status/BUILD.bazel
index 2b83077d..d164252d 100644
--- a/absl/status/BUILD.bazel
+++ b/absl/status/BUILD.bazel
@@ -40,6 +40,7 @@ cc_library(
     ],
     copts = ABSL_DEFAULT_COPTS,
     deps = [
+        "//absl/base:atomic_hook",
         "//absl/base:config",
         "//absl/base:core_headers",
         "//absl/base:raw_logging_internal",
diff --git a/absl/status/CMakeLists.txt b/absl/status/CMakeLists.txt
index f05cee5e..c041d695 100644
--- a/absl/status/CMakeLists.txt
+++ b/absl/status/CMakeLists.txt
@@ -25,6 +25,7 @@ absl_cc_library(
   COPTS
     ${ABSL_DEFAULT_COPTS}
   DEPS
+    absl::atomic_hook
     absl::config
     absl::core_headers
     absl::raw_logging_internal
diff --git a/absl/status/status_payload_printer.cc b/absl/status/status_payload_printer.cc
index ad96d76a..a47aea11 100644
--- a/absl/status/status_payload_printer.cc
+++ b/absl/status/status_payload_printer.cc
@@ -16,26 +16,21 @@
 #include <atomic>
 
 #include "absl/base/attributes.h"
+#include "absl/base/internal/atomic_hook.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
 namespace status_internal {
 
-namespace {
-// Tried constant initialized global variable but it doesn't work with Lexan
-// (MSVC's `std::atomic` has trouble constant initializing).
-std::atomic<StatusPayloadPrinter>& GetStatusPayloadPrinterStorage() {
-  ABSL_CONST_INIT static std::atomic<StatusPayloadPrinter> instance{nullptr};
-  return instance;
-}
-}  // namespace
+ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES
+static absl::base_internal::AtomicHook<StatusPayloadPrinter> storage;
 
 void SetStatusPayloadPrinter(StatusPayloadPrinter printer) {
-  GetStatusPayloadPrinterStorage().store(printer, std::memory_order_relaxed);
+  storage.Store(printer);
 }
 
 StatusPayloadPrinter GetStatusPayloadPrinter() {
-  return GetStatusPayloadPrinterStorage().load(std::memory_order_relaxed);
+  return storage.Load();
 }
 
 }  // namespace status_internal
-- 
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