The following patch attempts to implement the C++26 P2927R3 - Inspecting exception_ptr
paper (but not including P3748R0, I plan to play with it incrementally and
it will really depend on the Constexpr exceptions patch).
The function template is implemented using an out of line private method of
exception_ptr, so that P3748R0 then can use if consteval and provide a
constant evaluation variant of it.
2025-06-26 Jakub Jelinek <jakub@redhat.com>
* include/bits/version.def (exception_ptr_cast): Add.
* include/bits/version.h: Regenerate.
* libsupc++/exception: Define __glibcxx_want_exception_ptr_cast before
including bits/version.h.
* libsupc++/exception_ptr.h (std::exception_ptr_cast): Define.
(std::__exception_ptr::exception_ptr::_M_exception_ptr_cast): Declare.
* libsupc++/eh_ptr.cc
(std::__exception_ptr::exception_ptr::_M_exception_ptr_cast): Define.
* src/c++23/std.cc.in (std::exception_ptr_cast): Export.
* config/abi/pre/gnu.ver: Export
_ZNKSt15__exception_ptr13exception_ptr21_M_exception_ptr_castERKSt9type_info
at CXXABI_1.3.17.
* testsuite/util/testsuite_abi.cc (check_version): Allow CXXABI_1.3.17.
* testsuite/18_support/exception_ptr/exception_ptr_cast.cc: New test.
af5b72cf9f