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Enable [[msvc::no_unique_address]] attribute. #553

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Merged
jzmaddock merged 1 commit into from
Aug 15, 2026
Merged

Enable [[msvc::no_unique_address]] attribute. #553

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5 changes: 5 additions & 0 deletions include/boost/config/compiler/visualc.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -273,6 +273,11 @@
#define BOOST_NO_CXX17_AUTO_NONTYPE_TEMPLATE_PARAMS
#endif

#if _MSC_FULL_VER >= 192829913
// Works with /std:c++14 and /std:c++17, and performs optimization
#define BOOST_ATTRIBUTE_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
#endif

//
// Things that don't work in clr mode:
//
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4 changes: 2 additions & 2 deletions include/boost/config/detail/suffix.hpp
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Expand Up @@ -1097,15 +1097,15 @@ namespace std{ using ::type_info; }
#if __has_attribute(nodiscard)
# define BOOST_ATTRIBUTE_NODISCARD [[nodiscard]]
#endif
#if __has_attribute(no_unique_address)
#if __has_attribute(no_unique_address) && !defined(BOOST_ATTRIBUTE_NO_UNIQUE_ADDRESS)
# define BOOST_ATTRIBUTE_NO_UNIQUE_ADDRESS [[no_unique_address]]
#endif
#elif defined(__has_cpp_attribute)
// clang-6 accepts [[nodiscard]] with -std=c++14, but warns about it -pedantic
#if __has_cpp_attribute(nodiscard) && !(defined(__clang__) && (__cplusplus < 201703L)) && !(defined(__GNUC__) && (__cplusplus < 201100))
# define BOOST_ATTRIBUTE_NODISCARD [[nodiscard]]
#endif
#if __has_cpp_attribute(no_unique_address) && !(defined(__GNUC__) && (__cplusplus < 201100))
#if __has_cpp_attribute(no_unique_address) && !(defined(__GNUC__) && (__cplusplus < 201100)) && !defined(BOOST_ATTRIBUTE_NO_UNIQUE_ADDRESS)
# define BOOST_ATTRIBUTE_NO_UNIQUE_ADDRESS [[no_unique_address]]
#endif
#endif
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