Index: docs/DesignDocs/VisibilityMacros.rst
===================================================================
--- docs/DesignDocs/VisibilityMacros.rst
+++ docs/DesignDocs/VisibilityMacros.rst
@@ -210,6 +210,11 @@
   available. This is an internal macro used by other visibility macros, and
   it should not be used directly.
 
+**_LIBCPP_REFSTRING_TYPE_VISIBILITY**
+  When targeting the MSVC ABI, mark a type's typeinfo, vtable and members as
+  having default visibility.  Otherwise, mark them as hidden so they will not be
+  exported from shared libraries.  Used specifically for `__libcpp_refstring`.
+
 Links
 =====
 
Index: include/__config
===================================================================
--- include/__config
+++ include/__config
@@ -999,6 +999,15 @@
 #  define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
 #endif
 
+#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
+#  define _LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS
+#  define _LIBCPP_REFSTRING_TYPE_VISIBILITY _LIBCPP_TYPE_VIS
+#  define _LIBCPP_REFSTRING_INLINE
+#else
+#  define _LIBCPP_REFSTRING_TYPE_VISIBILITY _LIBCPP_HIDDEN
+#  define _LIBCPP_REFSTRING_INLINE inline
+#endif
+
 #if defined(__APPLE__)
 #  if !defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && \
       defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
Index: include/stdexcept
===================================================================
--- include/stdexcept
+++ include/stdexcept
@@ -54,7 +54,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-class _LIBCPP_HIDDEN __libcpp_refstring
+class _LIBCPP_REFSTRING_TYPE_VISIBILITY __libcpp_refstring
 {
     const char* __imp_;
 
@@ -80,12 +80,16 @@
     _VSTD::__libcpp_refstring __imp_;
 public:
     explicit logic_error(const string&);
+#if defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
+    _LIBCPP_INLINE_VISIBILITY explicit logic_error(const char* __msg) : __imp_(__msg) {}
+#else
     explicit logic_error(const char*);
 
     logic_error(const logic_error&) _NOEXCEPT;
     logic_error& operator=(const logic_error&) _NOEXCEPT;
 
     virtual ~logic_error() _NOEXCEPT;
+#endif
 
     virtual const char* what() const _NOEXCEPT;
 };
@@ -97,12 +101,16 @@
     _VSTD::__libcpp_refstring __imp_;
 public:
     explicit runtime_error(const string&);
+#if defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
+    _LIBCPP_INLINE_VISIBILITY explicit runtime_error(const char* __msg) : __imp_(__msg) {}
+#else
     explicit runtime_error(const char*);
 
     runtime_error(const runtime_error&) _NOEXCEPT;
     runtime_error& operator=(const runtime_error&) _NOEXCEPT;
 
     virtual ~runtime_error() _NOEXCEPT;
+#endif
 
     virtual const char* what() const _NOEXCEPT;
 };
@@ -114,7 +122,9 @@
     _LIBCPP_INLINE_VISIBILITY explicit domain_error(const string& __s) : logic_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit domain_error(const char* __s)   : logic_error(__s) {}
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
     virtual ~domain_error() _NOEXCEPT;
+#endif
 };
 
 class _LIBCPP_EXCEPTION_ABI invalid_argument
@@ -124,7 +134,9 @@
     _LIBCPP_INLINE_VISIBILITY explicit invalid_argument(const string& __s) : logic_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit invalid_argument(const char* __s)   : logic_error(__s) {}
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
     virtual ~invalid_argument() _NOEXCEPT;
+#endif
 };
 
 class _LIBCPP_EXCEPTION_ABI length_error
@@ -134,7 +146,9 @@
     _LIBCPP_INLINE_VISIBILITY explicit length_error(const string& __s) : logic_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit length_error(const char* __s)   : logic_error(__s) {}
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
     virtual ~length_error() _NOEXCEPT;
+#endif
 };
 
 class _LIBCPP_EXCEPTION_ABI out_of_range
@@ -144,7 +158,9 @@
     _LIBCPP_INLINE_VISIBILITY explicit out_of_range(const string& __s) : logic_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit out_of_range(const char* __s)   : logic_error(__s) {}
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
     virtual ~out_of_range() _NOEXCEPT;
+#endif
 };
 
 class _LIBCPP_EXCEPTION_ABI range_error
@@ -154,7 +170,9 @@
     _LIBCPP_INLINE_VISIBILITY explicit range_error(const string& __s) : runtime_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit range_error(const char* __s)   : runtime_error(__s) {}
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
     virtual ~range_error() _NOEXCEPT;
+#endif
 };
 
 class _LIBCPP_EXCEPTION_ABI overflow_error
@@ -164,7 +182,9 @@
     _LIBCPP_INLINE_VISIBILITY explicit overflow_error(const string& __s) : runtime_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit overflow_error(const char* __s)   : runtime_error(__s) {}
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
     virtual ~overflow_error() _NOEXCEPT;
+#endif
 };
 
 class _LIBCPP_EXCEPTION_ABI underflow_error
@@ -174,7 +194,9 @@
     _LIBCPP_INLINE_VISIBILITY explicit underflow_error(const string& __s) : runtime_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit underflow_error(const char* __s)   : runtime_error(__s) {}
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
     virtual ~underflow_error() _NOEXCEPT;
+#endif
 };
 
 }  // std
Index: src/include/refstring.h
===================================================================
--- src/include/refstring.h
+++ src/include/refstring.h
@@ -66,7 +66,7 @@
 
 using namespace __refstring_imp;
 
-inline
+_LIBCPP_REFSTRING_INLINE
 __libcpp_refstring::__libcpp_refstring(const char* msg) {
     std::size_t len = strlen(msg);
     _Rep_base* rep = static_cast<_Rep_base *>(::operator new(sizeof(*rep) + len + 1));
@@ -78,7 +78,7 @@
     __imp_ = data;
 }
 
-inline
+_LIBCPP_REFSTRING_INLINE
 __libcpp_refstring::__libcpp_refstring(const __libcpp_refstring &s) _NOEXCEPT
     : __imp_(s.__imp_)
 {
@@ -86,7 +86,7 @@
         __libcpp_atomic_add(&rep_from_data(__imp_)->count, 1);
 }
 
-inline
+_LIBCPP_REFSTRING_INLINE
 __libcpp_refstring& __libcpp_refstring::operator=(__libcpp_refstring const& s) _NOEXCEPT {
     bool adjust_old_count = __uses_refcount();
     struct _Rep_base *old_rep = rep_from_data(__imp_);
@@ -103,7 +103,7 @@
     return *this;
 }
 
-inline
+_LIBCPP_REFSTRING_INLINE
 __libcpp_refstring::~__libcpp_refstring() {
     if (__uses_refcount()) {
         _Rep_base* rep = rep_from_data(__imp_);
@@ -113,7 +113,7 @@
     }
 }
 
-inline
+_LIBCPP_REFSTRING_INLINE
 bool __libcpp_refstring::__uses_refcount() const {
 #ifdef __APPLE__
     return __imp_ != get_gcc_empty_string_storage();
Index: src/stdexcept.cpp
===================================================================
--- src/stdexcept.cpp
+++ src/stdexcept.cpp
@@ -28,6 +28,7 @@
 {
 }
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
 logic_error::logic_error(const char* msg) : __imp_(msg)
 {
 }
@@ -42,11 +43,13 @@
     __imp_ = le.__imp_;
     return *this;
 }
+#endif
 
 runtime_error::runtime_error(const string& msg) : __imp_(msg.c_str())
 {
 }
 
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
 runtime_error::runtime_error(const char* msg) : __imp_(msg)
 {
 }
@@ -62,6 +65,7 @@
     __imp_ = le.__imp_;
     return *this;
 }
+#endif
 
 #if !defined(_LIBCPPABI_VERSION) && !defined(LIBSTDCXX)
 
@@ -77,7 +81,7 @@
     return __imp_.c_str();
 }
 
-#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)
+#if !defined(_LIBCPP_ABI_INLINE_STDEXCEPT_DEFINITIONS)
 
 logic_error::~logic_error() _NOEXCEPT {}
 domain_error::~domain_error() _NOEXCEPT {}