Update to boost 1.68

[features.git] / 3rdparty / boost / boost / config / compiler / clang.hpp

diff --git a/3rdparty/boost/boost/config/compiler/clang.hpp b/3rdparty/boost/boost/config/compiler/clang.hpp
index 157a94d267e1b020623e7fd52bf13bc09868ecb7..3d893c689ae66ca941f1aa780d5c929233d58343 100644 (file)
--- a/3rdparty/boost/boost/config/compiler/clang.hpp
+++ b/3rdparty/boost/boost/config/compiler/clang.hpp
@@ -98,11 +98,15 @@
 //
 // Dynamic shared object (DSO) and dynamic-link library (DLL) support
 //
-#if !defined(_WIN32) && !defined(__WIN32__) && !defined(WIN32)
+#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(__CYGWIN__)
+#  define BOOST_HAS_DECLSPEC
+#  define BOOST_SYMBOL_EXPORT __attribute__((__dllexport__))
+#  define BOOST_SYMBOL_IMPORT __attribute__((__dllimport__))
+#else
 #  define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
 #  define BOOST_SYMBOL_IMPORT
-#  define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
 #endif
+#define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
 
 //
 // The BOOST_FALLTHROUGH macro can be used to annotate implicit fall-through
@@ -290,6 +294,10 @@
 #  define BOOST_NO_CXX17_STRUCTURED_BINDINGS
 #endif
 
+#if !defined(__cpp_if_constexpr) || (__cpp_if_constexpr < 201606)
+#  define BOOST_NO_CXX17_IF_CONSTEXPR
+#endif
+
 // Clang 3.9+ in c++1z
 #if !__has_cpp_attribute(fallthrough) || __cplusplus < 201406L
 #  define BOOST_NO_CXX17_INLINE_VARIABLES
@@ -318,6 +326,11 @@
 // Clang has supported the 'unused' attribute since the first release.
 #define BOOST_ATTRIBUTE_UNUSED __attribute__((__unused__))
 
+// Type aliasing hint.
+#if __has_attribute(__may_alias__)
+#  define BOOST_MAY_ALIAS __attribute__((__may_alias__))
+#endif
+
 #ifndef BOOST_COMPILER
 #  define BOOST_COMPILER "Clang version " __clang_version__
 #endif