diff --git a/libcxx/include/__config b/libcxx/include/__config
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -130,6 +130,13 @@
        use _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR instead
 #endif
 
+#if defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ABI_UNSTABLE) || _LIBCPP_ABI_VERSION >= 2
+// Enable additional explicit instantiations of iostreams components. This
+// reduces the number of weak definitions generated in programs that use
+// iostreams by providing a single strong definition in the shared library.
+# define _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1
+#endif
+
 #define _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_X##_LIBCPP_Y
 #define _LIBCPP_CONCAT(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y)
 
diff --git a/libcxx/include/fstream b/libcxx/include/fstream
--- a/libcxx/include/fstream
+++ b/libcxx/include/fstream
@@ -241,7 +241,7 @@
       return open(__p.c_str(), __mode);
     }
 #endif
-    _LIBCPP_INLINE_VISIBILITY
+    inline _LIBCPP_INLINE_VISIBILITY
     basic_filebuf* __open(int __fd, ios_base::openmode __mode);
 #endif
     basic_filebuf* close();
@@ -571,7 +571,8 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_INLINE_VISIBILITY basic_filebuf<_CharT, _Traits>*
+inline _LIBCPP_INLINE_VISIBILITY
+basic_filebuf<_CharT, _Traits>*
 basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
   basic_filebuf<_CharT, _Traits>* __rt = 0;
   if (__file_ == 0) {
@@ -1757,6 +1758,12 @@
         this->setstate(ios_base::failbit);
 }
 
+#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ifstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ofstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_filebuf<char>)
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
diff --git a/libcxx/include/sstream b/libcxx/include/sstream
--- a/libcxx/include/sstream
+++ b/libcxx/include/sstream
@@ -836,6 +836,13 @@
     __x.swap(__y);
 }
 
+#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringbuf<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostringstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istringstream<char>)
+#endif
+
 _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
diff --git a/libcxx/lib/abi/CHANGELOG.TXT b/libcxx/lib/abi/CHANGELOG.TXT
--- a/libcxx/lib/abi/CHANGELOG.TXT
+++ b/libcxx/lib/abi/CHANGELOG.TXT
@@ -16,7 +16,161 @@
 Version 12.0
 ------------
 
-* XXXXXXX - [libc++] Define new/delete in libc++abi only by default
+* XXXXXXX - [libc++] Instantiate additional <iostream> members in the dylib
+
+  This commit added new explicit instantiations for classes in <iostream> in
+  the library. This was done after noticing that many programs that used streams
+  ended up containing weak definitions of these classes, which has a negative
+  impact on both code size and load times. This change is not an ABI break,
+  since we are just adding additional symbols.
+
+  x86_64-apple-apple-darwin
+  -------------------------
+  Symbol added: __ZNKSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE3strEv
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE11__read_modeEv
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE12__write_modeEv
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4openEPKcj
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4swapERS3_
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4syncEv
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5closeEv
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5imbueERKNS_6localeE
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE6setbufEPcl
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE7seekoffExNS_8ios_base7seekdirEj
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE7seekposENS_4fposI11__mbstate_tEEj
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE8overflowEi
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE9pbackfailEi
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE9underflowEv
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEEC1EOS3_
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEEC1Ev
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEEC2EOS3_
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEEC2Ev
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEED0Ev
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEED1Ev
+  Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEED2Ev
+  Symbol added: __ZNSt3__114basic_ifstreamIcNS_11char_traitsIcEEE4openEPKcj
+  Symbol added: __ZNSt3__114basic_ifstreamIcNS_11char_traitsIcEEE4openERKNS_12basic_stringIcS2_NS_9allocatorIcEEEEj
+  Symbol added: __ZNSt3__114basic_ofstreamIcNS_11char_traitsIcEEE4openEPKcj
+  Symbol added: __ZNSt3__114basic_ofstreamIcNS_11char_traitsIcEEE4openERKNS_12basic_stringIcS2_NS_9allocatorIcEEEEj
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE3strERKNS_12basic_stringIcS2_S4_EE
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE4swapERS5_
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE7seekoffExNS_8ios_base7seekdirEj
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE8overflowEi
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9pbackfailEi
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9underflowEv
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEC1EOS5_
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEC2EOS5_
+  Symbol added: __ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_
+  Symbol added: __ZNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_
+  Symbol added: __ZNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_
+  Symbol added: __ZNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_
+  Symbol added: __ZTCNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE0_NS_13basic_istreamIcS2_EE
+  Symbol added: __ZTCNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE0_NS_13basic_ostreamIcS2_EE
+  Symbol added: __ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_13basic_istreamIcS2_EE
+  Symbol added: __ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_14basic_iostreamIcS2_EE
+  Symbol added: __ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE16_NS_13basic_ostreamIcS2_EE
+  Symbol added: __ZTCNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_13basic_istreamIcS2_EE
+  Symbol added: __ZTCNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_13basic_ostreamIcS2_EE
+  Symbol added: __ZTINSt3__113basic_filebufIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTINSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTINSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTINSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTINSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTINSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTINSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTSNSt3__113basic_filebufIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTSNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTSNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTSNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTSNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTSNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTSNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTTNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTTNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTTNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTTNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTTNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTVNSt3__113basic_filebufIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTVNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTVNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+  Symbol added: __ZTVNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTVNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTVNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: __ZTVNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+
+  x86_64-unknown-linux-gnu
+  ------------------------
+  Symbol added: _ZNKSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE3strEv
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE11__read_modeEv
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE12__write_modeEv
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4openEPKcj
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4swapERS3_
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4syncEv
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5closeEv
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5imbueERKNS_6localeE
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE6setbufEPcl
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE7seekoffExNS_8ios_base7seekdirEj
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE7seekposENS_4fposI11__mbstate_tEEj
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE8overflowEi
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE9pbackfailEi
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE9underflowEv
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEEC1EOS3_
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEEC1Ev
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEEC2EOS3_
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEEC2Ev
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEED0Ev
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEED1Ev
+  Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEED2Ev
+  Symbol added: _ZNSt3__114basic_ifstreamIcNS_11char_traitsIcEEE4openEPKcj
+  Symbol added: _ZNSt3__114basic_ifstreamIcNS_11char_traitsIcEEE4openERKNS_12basic_stringIcS2_NS_9allocatorIcEEEEj
+  Symbol added: _ZNSt3__114basic_ofstreamIcNS_11char_traitsIcEEE4openEPKcj
+  Symbol added: _ZNSt3__114basic_ofstreamIcNS_11char_traitsIcEEE4openERKNS_12basic_stringIcS2_NS_9allocatorIcEEEEj
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE3strERKNS_12basic_stringIcS2_S4_EE
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE4swapERS5_
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE7seekoffExNS_8ios_base7seekdirEj
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE8overflowEi
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9pbackfailEi
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9underflowEv
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEC1EOS5_
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEC2EOS5_
+  Symbol added: _ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_
+  Symbol added: _ZNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_
+  Symbol added: _ZNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_
+  Symbol added: _ZNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_
+  Symbol added: _ZTCNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE0_NS_13basic_istreamIcS2_EE
+  Symbol added: _ZTCNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE0_NS_13basic_ostreamIcS2_EE
+  Symbol added: _ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_13basic_istreamIcS2_EE
+  Symbol added: _ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_14basic_iostreamIcS2_EE
+  Symbol added: _ZTCNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE16_NS_13basic_ostreamIcS2_EE
+  Symbol added: _ZTCNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_13basic_istreamIcS2_EE
+  Symbol added: _ZTCNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE0_NS_13basic_ostreamIcS2_EE
+  Symbol added: _ZTINSt3__113basic_filebufIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTINSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTINSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTINSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTINSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTINSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTINSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTSNSt3__113basic_filebufIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTSNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTSNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTSNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTSNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTSNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTSNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTTNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTTNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTTNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTTNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTTNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTVNSt3__113basic_filebufIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTVNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTVNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+  Symbol added: _ZTVNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTVNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTVNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+  Symbol added: _ZTVNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+
+* 9b40ee8eb0c1 - [libc++] Define new/delete in libc++abi only by default
 
   By default, libc++ does not include the definition for new and delete anymore.
   Those were previously defined in both libc++ and libc++abi, which was an
diff --git a/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist b/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
--- a/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
+++ b/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
@@ -495,6 +495,7 @@
 {'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IwLb1EE9do_lengthER11__mbstate_tPKcS5_m', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__115basic_streambufIcNS_11char_traitsIcEEE6getlocEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__115basic_streambufIwNS_11char_traitsIwEEE6getlocEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE3strEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__115error_condition7messageEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__117moneypunct_bynameIcLb0EE11do_groupingEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__117moneypunct_bynameIcLb0EE13do_neg_formatEv', 'type': 'FUNC'}
@@ -1084,6 +1085,26 @@
 {'is_defined': True, 'name': '__ZNSt3__112system_errorD1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__112system_errorD2Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__113allocator_argE', 'size': 0, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE11__read_modeEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE12__write_modeEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4openEPKcj', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4swapERS3_', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4syncEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5closeEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5imbueERKNS_6localeE', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE6setbufEPcl', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE7seekoffExNS_8ios_base7seekdirEj', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE7seekposENS_4fposI11__mbstate_tEEj', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE8overflowEi', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE9pbackfailEi', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE9underflowEv', 'type': 'FUNC'}
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 {'is_defined': True, 'name': '_ZTSNSt3__115messages_bynameIwEE', 'size': 29, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__115numpunct_bynameIcEE', 'size': 29, 'type': 'OBJECT'}
@@ -1742,7 +1797,10 @@
 {'is_defined': True, 'name': '_ZTSNSt3__117moneypunct_bynameIwLb1EEE', 'size': 35, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__118__time_get_storageIcEE', 'size': 32, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__118__time_get_storageIwEE', 'size': 32, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTSNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 69, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__119__shared_weak_countE', 'size': 30, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTSNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 70, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTSNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 70, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IDiEE', 'size': 35, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IDsEE', 'size': 35, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IwEE', 'size': 34, 'type': 'OBJECT'}
@@ -1795,7 +1853,12 @@
 {'is_defined': True, 'name': '_ZTTNSt3__113basic_istreamIwNS_11char_traitsIwEEEE', 'size': 16, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTTNSt3__113basic_ostreamIcNS_11char_traitsIcEEEE', 'size': 16, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTTNSt3__113basic_ostreamIwNS_11char_traitsIwEEEE', 'size': 16, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE', 'size': 32, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTTNSt3__114basic_iostreamIcNS_11char_traitsIcEEEE', 'size': 56, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE', 'size': 32, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 80, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 32, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 32, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTTNSt3__19strstreamE', 'size': 80, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt12experimental15fundamentals_v112bad_any_castE', 'size': 40, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt12experimental19bad_optional_accessE', 'size': 40, 'type': 'OBJECT'}
@@ -1812,6 +1875,7 @@
 {'is_defined': True, 'name': '_ZTVNSt3__112future_errorE', 'size': 40, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__112strstreambufE', 'size': 128, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__112system_errorE', 'size': 40, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__113basic_filebufIcNS_11char_traitsIcEEEE', 'size': 128, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__113basic_istreamIcNS_11char_traitsIcEEEE', 'size': 80, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__113basic_istreamIwNS_11char_traitsIwEEEE', 'size': 80, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__113basic_ostreamIcNS_11char_traitsIcEEEE', 'size': 80, 'type': 'OBJECT'}
@@ -1820,7 +1884,9 @@
 {'is_defined': True, 'name': '_ZTVNSt3__114__codecvt_utf8IDsEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__114__codecvt_utf8IwEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__114__shared_countE', 'size': 40, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE', 'size': 80, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__114basic_iostreamIcNS_11char_traitsIcEEEE', 'size': 120, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE', 'size': 80, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__114codecvt_bynameIDic11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__114codecvt_bynameIDsc11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__114codecvt_bynameIcc11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
@@ -1836,6 +1902,7 @@
 {'is_defined': True, 'name': '_ZTVNSt3__115__codecvt_utf16IwLb1EEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__115basic_streambufIcNS_11char_traitsIcEEEE', 'size': 128, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__115basic_streambufIwNS_11char_traitsIwEEEE', 'size': 128, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 128, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__115messages_bynameIcEE', 'size': 64, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__115messages_bynameIwEE', 'size': 64, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__115numpunct_bynameIcEE', 'size': 80, 'type': 'OBJECT'}
@@ -1853,7 +1920,10 @@
 {'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIcLb1EEE', 'size': 112, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIwLb0EEE', 'size': 112, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIwLb1EEE', 'size': 112, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 120, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__119__shared_weak_countE', 'size': 56, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 80, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 80, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IDiEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IDsEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IwEE', 'size': 96, 'type': 'OBJECT'}
diff --git a/libcxx/src/ios.instantiations.cpp b/libcxx/src/ios.instantiations.cpp
--- a/libcxx/src/ios.instantiations.cpp
+++ b/libcxx/src/ios.instantiations.cpp
@@ -7,9 +7,11 @@
 //===----------------------------------------------------------------------===//
 
 #include "__config"
+#include "fstream"
 #include "ios"
 #include "istream"
 #include "ostream"
+#include "sstream"
 #include "streambuf"
 
 
@@ -26,6 +28,16 @@
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<wchar_t>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_iostream<char>;
 
+// Additional instantiations added later. Whether programs rely on these being
+// available is protected by _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1.
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_stringbuf<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_stringstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostringstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istringstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ifstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ofstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_filebuf<char>;
+
 // Add more here if needed...
 
 _LIBCPP_END_NAMESPACE_STD