[libc++] Instantiate additional <iostream> members in the dylib

[ldionne]

Summary

This commit adds new explicit instantiations for some classes in <iostream>
in the library. This is done after noticing that many programs that use
streams end up containing weak definitions of these classes, which has a
negative impact on both code size and load times (due to the need to
resolve weak symbols at load time). Note that we are just adding the
additional explicit instantiations for the char specializations, since
the wchar_t specializations are not used as often, and as a result there
wouldn't be a clear benefit.

This change is not an ABI break, since we are just adding additional
symbols.

[ldionne]

Fix build on GCC by adding a forgotten inline

libcxx/include/__config

 #  endif
 #endif
 
 #ifdef _LIBCPP_TRIVIAL_PAIR_COPY_CTOR
 #error "_LIBCPP_TRIVIAL_PAIR_COPY_CTOR" is no longer supported. \
        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)
 
 #ifndef _LIBCPP_ABI_NAMESPACE
 # define _LIBCPP_ABI_NAMESPACE _LIBCPP_CONCAT(__,_LIBCPP_ABI_VERSION)
 #endif
 
 #if __cplusplus < 201103L

libcxx/include/fstream

#endif
     basic_filebuf* open(const string& __s, ios_base::openmode __mode);
 
 #if _LIBCPP_STD_VER >= 17
     _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_INLINE_VISIBILITY
     basic_filebuf* open(const _VSTD_FS::path& __p, ios_base::openmode __mode) {
       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();
 
     _LIBCPP_INLINE_VISIBILITY
     inline static const char*
     __make_mdstring(ios_base::openmode __mode) _NOEXCEPT;
 
if (__file_ == 0)
         } else
           __rt = 0;
       }
     }
     return __rt;
 }
 
 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) {
     if (const char* __mdstr = __make_mdstring(__mode)) {
       __rt = this;
       __file_ = fdopen(__fd, __mdstr);
       if (__file_) {
         __om_ = __mode;

 inline
 void
 basic_fstream<_CharT, _Traits>::close()
 {
     if (__sb_.close() == 0)
         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
 
 #endif  // _LIBCPP_FSTREAM

libcxx/include/sstream

 inline _LIBCPP_INLINE_VISIBILITY
 void
 swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x,
      basic_stringstream<_CharT, _Traits, _Allocator>& __y)
 {
     __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
 
 #endif  // _LIBCPP_SSTREAM

libcxx/lib/abi/CHANGELOG.TXT

 Afterwards the ABI list should be updated to include the new changes.
 
 New entries should be added directly below the "Version" header.
 
 ------------
 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
   ODR violation.
 
   x86_64-apple-apple-darwin
   -------------------------
   The following symbols are now re-exported from libc++abi instead of exported

libcxx/lib/abi/x86_64-apple-darwin.v1.abilist

 {'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IwLb1EE11do_encodingEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IwLb1EE13do_max_lengthEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IwLb1EE16do_always_noconvEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IwLb1EE5do_inER11__mbstate_tPKcS5_RS5_PwS7_RS7_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IwLb1EE6do_outER11__mbstate_tPKwS5_RS5_PcS7_RS7_', 'type': 'FUNC'}
 {'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'}
 {'is_defined': True, 'name': '__ZNKSt3__117moneypunct_bynameIcLb0EE13do_pos_formatEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__117moneypunct_bynameIcLb0EE14do_curr_symbolEv', 'type': 'FUNC'}
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 No newline at end of file

libcxx/src/ios.instantiations.cpp

 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "__config"
+#include "fstream"
 #include "ios"
 #include "istream"
 #include "ostream"
+#include "sstream"
 #include "streambuf"
 
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 // Original explicit instantiations provided in the library
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ios<char>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ios<wchar_t>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_streambuf<char>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_streambuf<wchar_t>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istream<char>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istream<wchar_t>;
 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<char>;
 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