From bf08155d16ea8c359d1bfab6bac684cdfada4a5b Mon Sep 17 00:00:00 2001
From: Andrey Semashev <andrey.semashev@gmail.com>
Date: Wed, 15 Dec 2021 02:06:11 +0300
Subject: [PATCH] Fix compilation for UWP.

UWP does not support APIs related to dynamic symbol binding and dlls.
Disable runtime detection of WaitOnAddress & co. for that target. These
APIs should be enabled at compile time on Windows 8.

Fixes https://github.com/boostorg/atomic/issues/54.
---
 doc/changelog.qbk       |  4 ++++
 src/wait_on_address.cpp | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/doc/changelog.qbk b/doc/changelog.qbk
index 9c370c9..ffbd902 100644
--- a/doc/changelog.qbk
+++ b/doc/changelog.qbk
@@ -7,6 +7,10 @@
 
 [section:changelog Changelog]
 
+[heading Boost 1.79]
+
+* Fixed compilation for Universal Windows Platform (UWP). ([github_issue 54])
+
 [heading Boost 1.78]
 
 * Use process-local futex operations on Android for non-IPC waiting and notifying operations.
diff --git a/src/wait_on_address.cpp b/src/wait_on_address.cpp
index 7cf5bd0..6f8a165 100644
--- a/src/wait_on_address.cpp
+++ b/src/wait_on_address.cpp
@@ -25,6 +25,8 @@
 #include <boost/atomic/detail/once_flag.hpp>
 #include <boost/atomic/detail/wait_on_address.hpp>
 
+#if BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
 #include <boost/static_assert.hpp>
 #include <boost/memory_order.hpp>
 #include <boost/winapi/thread.hpp>
@@ -33,6 +35,8 @@
 
 #include <boost/atomic/detail/core_operations.hpp>
 
+#endif // BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
 #include <boost/atomic/detail/header.hpp>
 
 namespace boost {
@@ -43,6 +47,8 @@ BOOST_ATOMIC_DECL wait_on_address_t* wait_on_address = NULL;
 BOOST_ATOMIC_DECL wake_by_address_t* wake_by_address_single = NULL;
 BOOST_ATOMIC_DECL wake_by_address_t* wake_by_address_all = NULL;
 
+#if BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
 BOOST_ATOMIC_DECL once_flag wait_functions_once_flag = { 2u };
 
 BOOST_ATOMIC_DECL void initialize_wait_functions() BOOST_NOEXCEPT
@@ -90,6 +96,16 @@ BOOST_ATOMIC_DECL void initialize_wait_functions() BOOST_NOEXCEPT
     }
 }
 
+#else // BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
+BOOST_ATOMIC_DECL once_flag wait_functions_once_flag = { 0u };
+
+BOOST_ATOMIC_DECL void initialize_wait_functions() BOOST_NOEXCEPT
+{
+}
+
+#endif // BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
+
 } // namespace detail
 } // namespace atomics
 } // namespace boost
-- 
2.34.1.windows.1