Fix -Wdeprecated-copy-dtor and -Wdeprecated-dynamic-exception-spec warnings.

Summary:
The former are like:

libcxx/include/typeinfo:322:11: warning: definition of implicit copy constructor for 'bad_cast' is deprecated because it has a user-declared destructor [-Wdeprecated-copy-dtor]
  virtual ~bad_cast() _NOEXCEPT;
          ^
libcxx/include/typeinfo:344:11: note: in implicit copy constructor for 'std::bad_cast' first required here
    throw bad_cast();
          ^

Fix these by adding an explicitly defaulted copy constructor.

The latter are like:

libcxx/include/codecvt:105:37: warning: dynamic exception specifications are deprecated [-Wdeprecated-dynamic-exception-spec]
    virtual int do_encoding() const throw();
                                    ^~~~~~~

Fix these by using the _NOEXCEPT macro instead.

Reviewers: EricWF, mclow.lists, ldionne, #libc

Reviewed By: EricWF, #libc

Subscribers: dexonsmith, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D76150

GitOrigin-RevId: 585a3cc31bb49f2a526dcb74dc9a980379193f93
diff --git a/include/codecvt b/include/codecvt
index 5ea411e..05fa765 100644
--- a/include/codecvt
+++ b/include/codecvt
@@ -102,11 +102,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -137,11 +137,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -172,11 +172,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
@@ -225,11 +225,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -260,11 +260,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -295,11 +295,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -330,11 +330,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -365,11 +365,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -400,11 +400,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
@@ -453,11 +453,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -488,11 +488,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <>
@@ -523,11 +523,11 @@
     virtual result
         do_unshift(state_type& __st,
                    extern_type* __to, extern_type* __to_end, extern_type*& __to_nxt) const;
-    virtual int do_encoding() const throw();
-    virtual bool do_always_noconv() const throw();
+    virtual int do_encoding() const _NOEXCEPT;
+    virtual bool do_always_noconv() const _NOEXCEPT;
     virtual int do_length(state_type&, const extern_type* __frm, const extern_type* __end,
                           size_t __mx) const;
-    virtual int do_max_length() const throw();
+    virtual int do_max_length() const _NOEXCEPT;
 };
 
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
diff --git a/include/exception b/include/exception
index c7dcac2..8e32979 100644
--- a/include/exception
+++ b/include/exception
@@ -98,6 +98,8 @@
 {
 public:
     _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
+    _LIBCPP_INLINE_VISIBILITY exception(const exception&) _NOEXCEPT = default;
+
     virtual ~exception() _NOEXCEPT;
     virtual const char* what() const _NOEXCEPT;
 };
diff --git a/include/filesystem b/include/filesystem
index 0f7a4d5..1363b63 100644
--- a/include/filesystem
+++ b/include/filesystem
@@ -1346,6 +1346,7 @@
   _LIBCPP_INLINE_VISIBILITY
   const path& path2() const noexcept { return __storage_->__p2_; }
 
+  filesystem_error(const filesystem_error&) = default;
   ~filesystem_error() override; // key function
 
   _LIBCPP_INLINE_VISIBILITY
diff --git a/include/future b/include/future
index 751d122..bdf74e3 100644
--- a/include/future
+++ b/include/future
@@ -506,6 +506,7 @@
     _LIBCPP_INLINE_VISIBILITY
     const error_code& code() const _NOEXCEPT {return __ec_;}
 
+    future_error(const future_error&) _NOEXCEPT = default;
     virtual ~future_error() _NOEXCEPT;
 };
 
diff --git a/include/ios b/include/ios
index 88efefb..d6967ed 100644
--- a/include/ios
+++ b/include/ios
@@ -431,7 +431,8 @@
 public:
     explicit failure(const string& __msg, const error_code& __ec = io_errc::stream);
     explicit failure(const char* __msg, const error_code& __ec = io_errc::stream);
-    virtual ~failure() throw();
+    failure(const failure&) _NOEXCEPT = default;
+    virtual ~failure() _NOEXCEPT;
 };
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
diff --git a/include/memory b/include/memory
index bf31bfc..729b8b5 100644
--- a/include/memory
+++ b/include/memory
@@ -2198,39 +2198,39 @@
 public:
     typedef _Tp element_type;
 
-    _LIBCPP_INLINE_VISIBILITY explicit auto_ptr(_Tp* __p = 0) throw() : __ptr_(__p) {}
-    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr& __p) throw() : __ptr_(__p.release()) {}
-    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr<_Up>& __p) throw()
+    _LIBCPP_INLINE_VISIBILITY explicit auto_ptr(_Tp* __p = 0) _NOEXCEPT : __ptr_(__p) {}
+    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr& __p) _NOEXCEPT : __ptr_(__p.release()) {}
+    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr<_Up>& __p) _NOEXCEPT
         : __ptr_(__p.release()) {}
-    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr& __p) throw()
+    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr& __p) _NOEXCEPT
         {reset(__p.release()); return *this;}
-    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr<_Up>& __p) throw()
+    template<class _Up> _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr<_Up>& __p) _NOEXCEPT
         {reset(__p.release()); return *this;}
-    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr_ref<_Tp> __p) throw()
+    _LIBCPP_INLINE_VISIBILITY auto_ptr& operator=(auto_ptr_ref<_Tp> __p) _NOEXCEPT
         {reset(__p.__ptr_); return *this;}
-    _LIBCPP_INLINE_VISIBILITY ~auto_ptr() throw() {delete __ptr_;}
+    _LIBCPP_INLINE_VISIBILITY ~auto_ptr() _NOEXCEPT {delete __ptr_;}
 
-    _LIBCPP_INLINE_VISIBILITY _Tp& operator*() const throw()
+    _LIBCPP_INLINE_VISIBILITY _Tp& operator*() const _NOEXCEPT
         {return *__ptr_;}
-    _LIBCPP_INLINE_VISIBILITY _Tp* operator->() const throw() {return __ptr_;}
-    _LIBCPP_INLINE_VISIBILITY _Tp* get() const throw() {return __ptr_;}
-    _LIBCPP_INLINE_VISIBILITY _Tp* release() throw()
+    _LIBCPP_INLINE_VISIBILITY _Tp* operator->() const _NOEXCEPT {return __ptr_;}
+    _LIBCPP_INLINE_VISIBILITY _Tp* get() const _NOEXCEPT {return __ptr_;}
+    _LIBCPP_INLINE_VISIBILITY _Tp* release() _NOEXCEPT
     {
         _Tp* __t = __ptr_;
         __ptr_ = 0;
         return __t;
     }
-    _LIBCPP_INLINE_VISIBILITY void reset(_Tp* __p = 0) throw()
+    _LIBCPP_INLINE_VISIBILITY void reset(_Tp* __p = 0) _NOEXCEPT
     {
         if (__ptr_ != __p)
             delete __ptr_;
         __ptr_ = __p;
     }
 
-    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr_ref<_Tp> __p) throw() : __ptr_(__p.__ptr_) {}
-    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr_ref<_Up>() throw()
+    _LIBCPP_INLINE_VISIBILITY auto_ptr(auto_ptr_ref<_Tp> __p) _NOEXCEPT : __ptr_(__p.__ptr_) {}
+    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr_ref<_Up>() _NOEXCEPT
         {auto_ptr_ref<_Up> __t; __t.__ptr_ = release(); return __t;}
-    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr<_Up>() throw()
+    template<class _Up> _LIBCPP_INLINE_VISIBILITY operator auto_ptr<_Up>() _NOEXCEPT
         {return auto_ptr<_Up>(release());}
 };
 
@@ -3457,6 +3457,8 @@
     : public std::exception
 {
 public:
+    bad_weak_ptr() _NOEXCEPT = default;
+    bad_weak_ptr(const bad_weak_ptr&) _NOEXCEPT = default;
     virtual ~bad_weak_ptr() _NOEXCEPT;
     virtual const char* what() const  _NOEXCEPT;
 };
diff --git a/include/regex b/include/regex
index 68cfbb2..e33ac25 100644
--- a/include/regex
+++ b/include/regex
@@ -977,7 +977,8 @@
     regex_constants::error_type __code_;
 public:
     explicit regex_error(regex_constants::error_type __ecode);
-    virtual ~regex_error() throw();
+    regex_error(const regex_error&) _NOEXCEPT = default;
+    virtual ~regex_error() _NOEXCEPT;
      _LIBCPP_INLINE_VISIBILITY
     regex_constants::error_type code() const {return __code_;}
 };
diff --git a/include/stdexcept b/include/stdexcept
index 481f904..7a7f367 100644
--- a/include/stdexcept
+++ b/include/stdexcept
@@ -129,6 +129,7 @@
     _LIBCPP_INLINE_VISIBILITY explicit domain_error(const char* __s)   : logic_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    domain_error(const domain_error&) _NOEXCEPT = default;
     virtual ~domain_error() _NOEXCEPT;
 #endif
 };
@@ -141,6 +142,7 @@
     _LIBCPP_INLINE_VISIBILITY explicit invalid_argument(const char* __s)   : logic_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    invalid_argument(const invalid_argument&) _NOEXCEPT = default;
     virtual ~invalid_argument() _NOEXCEPT;
 #endif
 };
@@ -152,6 +154,7 @@
     _LIBCPP_INLINE_VISIBILITY explicit length_error(const string& __s) : logic_error(__s) {}
     _LIBCPP_INLINE_VISIBILITY explicit length_error(const char* __s)   : logic_error(__s) {}
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    length_error(const length_error&) _NOEXCEPT = default;
     virtual ~length_error() _NOEXCEPT;
 #endif
 };
@@ -164,6 +167,7 @@
     _LIBCPP_INLINE_VISIBILITY explicit out_of_range(const char* __s)   : logic_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    out_of_range(const out_of_range&) _NOEXCEPT = default;
     virtual ~out_of_range() _NOEXCEPT;
 #endif
 };
@@ -176,6 +180,7 @@
     _LIBCPP_INLINE_VISIBILITY explicit range_error(const char* __s)   : runtime_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    range_error(const range_error&) _NOEXCEPT = default;
     virtual ~range_error() _NOEXCEPT;
 #endif
 };
@@ -188,6 +193,7 @@
     _LIBCPP_INLINE_VISIBILITY explicit overflow_error(const char* __s)   : runtime_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    overflow_error(const overflow_error&) _NOEXCEPT = default;
     virtual ~overflow_error() _NOEXCEPT;
 #endif
 };
@@ -200,6 +206,7 @@
     _LIBCPP_INLINE_VISIBILITY explicit underflow_error(const char* __s)   : runtime_error(__s) {}
 
 #ifndef _LIBCPP_ABI_VCRUNTIME
+    underflow_error(const underflow_error&) _NOEXCEPT = default;
     virtual ~underflow_error() _NOEXCEPT;
 #endif
 };
diff --git a/include/system_error b/include/system_error
index 05ef079..74e889a 100644
--- a/include/system_error
+++ b/include/system_error
@@ -469,6 +469,7 @@
     system_error(int __ev, const error_category& __ecat, const string& __what_arg);
     system_error(int __ev, const error_category& __ecat, const char* __what_arg);
     system_error(int __ev, const error_category& __ecat);
+    system_error(const system_error&) _NOEXCEPT = default;
     ~system_error() _NOEXCEPT;
 
     _LIBCPP_INLINE_VISIBILITY
diff --git a/include/typeinfo b/include/typeinfo
index 74813cc..8b86c61 100644
--- a/include/typeinfo
+++ b/include/typeinfo
@@ -319,6 +319,7 @@
 {
  public:
   bad_cast() _NOEXCEPT;
+  bad_cast(const bad_cast&) _NOEXCEPT = default;
   virtual ~bad_cast() _NOEXCEPT;
   virtual const char* what() const _NOEXCEPT;
 };