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# clang-cl supports constexpr, so BOOST_CHRONO_LIB_CONSTEXPR expands to
# "constexpr", but MSVC's std::numeric_limits<>::max() isn't marked as
# constexpr, so clang-cl issues -Winvalid-constexpr:
--- boost/chrono/duration.hpp
+++ boost/chrono/duration.hpp
@@ -348,29 +348,36 @@
         static BOOST_CHRONO_LIB_CONSTEXPR T lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW {return (std::numeric_limits<T>::min)  ();}
     };
 
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Winvalid-constexpr"
+#endif
     template <>
     struct chrono_numeric_limits<float,true> {
         static BOOST_CHRONO_LIB_CONSTEXPR float lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW
         {
             return -(std::numeric_limits<float>::max) ();
         }
     };
 
     template <>
     struct chrono_numeric_limits<double,true> {
         static BOOST_CHRONO_LIB_CONSTEXPR double lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW
         {
             return -(std::numeric_limits<double>::max) ();
         }
     };
 
     template <>
     struct chrono_numeric_limits<long double,true> {
         static BOOST_CHRONO_LIB_CONSTEXPR long double lowest() BOOST_CHRONO_LIB_NOEXCEPT_OR_THROW
         {
             return -(std::numeric_limits<long double>::max)();
         }
     };
+#if defined _MSC_VER && defined __clang__
+#pragma clang diagnostic pop
+#endif
 
     template <class T>
     struct numeric_limits : chrono_numeric_limits<typename remove_cv<T>::type>
--- boost/config/compiler/clang.hpp
+++ boost/config/compiler/clang.hpp
@@ -260,9 +260,7 @@
 
 
 // Unused attribute:
-#if defined(__GNUC__) && (__GNUC__ >= 4)
 #  define BOOST_ATTRIBUTE_UNUSED __attribute__((unused))
-#endif
 
 #ifndef BOOST_COMPILER
 #  define BOOST_COMPILER "Clang version " __clang_version__

# workdir/UnpackedTarball/boost\boost/smart_ptr/detail/sp_counted_base_clang.hpp(29,1) :  error: cannot mangle this C11 atomic type yet
# inline void atomic_increment( atomic_int_least32_t * pw )
# ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--- boost/smart_ptr/detail/sp_counted_base.hpp
+++ boost/smart_ptr/detail/sp_counted_base.hpp
@@ -21,7 +21,7 @@
 #include <boost/smart_ptr/detail/sp_has_sync.hpp>
 
 #if defined( __clang__ ) && defined( __has_extension )
-# if __has_extension( __c_atomic__ )
+# if __has_extension( __c_atomic__ ) && !defined _MSC_VER
 #   define BOOST_SP_HAS_CLANG_C11_ATOMICS
 # endif
 #endif

# C:/lo64/core/workdir/UnpackedTarball/boost/libs/thread/src/win32/thread.cpp(1006,36) :  error: dllimport cannot be applied to non-inline function definition
#     BOOST_THREAD_DECL void __cdecl on_process_enter()
#                                    ^
--- boost/thread/detail/config.hpp
+++ boost/thread/detail/config.hpp
@@ -396,7 +396,7 @@
 #else //Use default
 #   if defined(BOOST_THREAD_PLATFORM_WIN32)
 #       if defined(BOOST_MSVC) || defined(BOOST_INTEL_WIN) \
-      || defined(__MINGW32__) || defined(MINGW32) || defined(BOOST_MINGW32)
+      || defined(__MINGW32__) || defined(MINGW32) || defined(BOOST_MINGW32) || defined __clang__
       //For compilers supporting auto-tss cleanup
             //with Boost.Threads lib, use Boost.Threads lib
 #           define BOOST_THREAD_USE_LIB