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The C++20 standard added new starts_with and ends_with members to std::basic_string, which were not previously instantiated in the library. This meant that the extern template declarations had to be disabled for C++20 mode. With this patch the new members are instantiated in the library and so the explicit instantiation declarations can be used for C++20. Furthermore, basic_string default constructor is now constrained with is_default_constructible_v<_Alloc> constrains, that is included in mangled name, so we also need to instantiate and export it. The new members added by C++23 are still not exported, and so the explicit instantiation declarations are still disabled for C++23. libstdc++-v3/ChangeLog: * config/abi/pre/gnu.ver (GLIBCXX_3.4): Make string exports less greedy. (GLIBCXX_3.4.35): Export basic_string default constructor and starts_with and ends_with members. * include/bits/basic_string.h: Update __cpluplus checks for C++20. * include/bits/cow_string.h: Likewise. * include/bits/basic_string.tcc: Declare explicit instantiations for C++20 as well as earlier dialects. * src/c++20/Makefile.am: Add cow-string-inst.cc and string-inst.cc source files. * src/c++20/Makefile.in: Regenerate. * src/c++20/string-inst.cc: New file defining explicit instantiations for basic_string default constructor and starts_with, ends_with methods added in C++20 * src/c++20/cow-string-inst.cc: Version of above for cow-stings. Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>