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LWG 2487 added a precondition to std::bind for C++17, making volatile-qualified uses undefined. We still support it, but with a deprecated warning. P1065R2 made it explicitly ill-formed for C++20, so we should no longer accept it as deprecated. This implements that change. libstdc++-v3/ChangeLog: * doc/xml/manual/evolution.xml: Document std::bind API changes. * doc/xml/manual/intro.xml: Document LWG 2487 status. * doc/xml/manual/using.xml: Clarify default value of _GLIBCXX_USE_DEPRECATED. * doc/html/*: Regenerate. * include/std/functional (_Bind::operator()(Args&&...) volatile) (_Bind::operator()(Args&&...) const volatile) (_Bind_result::operator()(Args&&...) volatile) (_Bind_result::operator()(Args&&...) const volatile): Replace with deleted overload for C++20 and later. * testsuite/20_util/bind/cv_quals.cc: Check for deprecated warnings in C++17. * testsuite/20_util/bind/cv_quals_2.cc: Likewise, and check for ill-formed in C++20.
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