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9e433b3461
Thanks to Jakub's addition of the built-in, we can add this to the library now. The compiler tests for the built-in are quite extensive, including verifying the constraints, so this only adds minimal tests to the library testsuite. This doesn't add a new _GLIBCXX_HAVE_BUILTIN_BIT_CAST because using __has_builtin(__builtin_bit_cast) works for GCC and versions of Clang that provide the built-in. libstdc++-v3/ChangeLog: PR libstdc++/93121 * include/std/bit (__cpp_lib_bit_cast, bit_cast): Define. * include/std/version (__cpp_lib_bit_cast): Define. * testsuite/26_numerics/bit/bit.cast/bit_cast.cc: New test. * testsuite/26_numerics/bit/bit.cast/version.cc: New test.
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