diff --git a/libcxx/include/__format/format_error.h b/libcxx/include/__format/format_error.h
--- a/libcxx/include/__format/format_error.h
+++ b/libcxx/include/__format/format_error.h
@@ -28,6 +28,7 @@
 
 #if _LIBCPP_STD_VER > 17
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 class _LIBCPP_EXCEPTION_ABI format_error : public runtime_error {
 public:
   _LIBCPP_HIDE_FROM_ABI explicit format_error(const string& __s)
@@ -36,6 +37,7 @@
       : runtime_error(__s) {}
   virtual ~format_error() noexcept;
 };
+#endif
 
 _LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void
 __throw_format_error(const char* __s) {
diff --git a/libcxx/include/filesystem b/libcxx/include/filesystem
--- a/libcxx/include/filesystem
+++ b/libcxx/include/filesystem
@@ -1683,6 +1683,7 @@
 //                filesystem_error to work around PR41078.
 _LIBCPP_AVAILABILITY_FILESYSTEM_POP
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 class _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_EXCEPTION_ABI filesystem_error : public system_error {
 public:
   _LIBCPP_INLINE_VISIBILITY
@@ -1734,6 +1735,7 @@
   };
   shared_ptr<_Storage> __storage_;
 };
+#endif
 
 _LIBCPP_AVAILABILITY_FILESYSTEM_PUSH
 
diff --git a/libcxx/include/future b/libcxx/include/future
--- a/libcxx/include/future
+++ b/libcxx/include/future
@@ -500,6 +500,7 @@
     return error_condition(static_cast<int>(__e), future_category());
 }
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_FUTURE_ERROR future_error
     : public logic_error
 {
@@ -513,6 +514,7 @@
     future_error(const future_error&) _NOEXCEPT = default;
     virtual ~future_error() _NOEXCEPT;
 };
+#endif
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 #ifndef _LIBCPP_NO_EXCEPTIONS
@@ -1340,10 +1342,12 @@
 {
     if (__state_)
     {
+#ifndef _LIBCPP_NO_EXCEPTIONS
         if (!__state_->__has_value() && __state_->use_count() > 1)
             __state_->set_exception(make_exception_ptr(
                       future_error(make_error_code(future_errc::broken_promise))
                                                       ));
+#endif // _LIBCPP_NO_EXCEPTIONS
         __state_->__release_shared();
     }
 }
@@ -1483,10 +1487,12 @@
 {
     if (__state_)
     {
+#ifndef _LIBCPP_NO_EXCEPTIONS
         if (!__state_->__has_value() && __state_->use_count() > 1)
             __state_->set_exception(make_exception_ptr(
                       future_error(make_error_code(future_errc::broken_promise))
                                                       ));
+#endif // _LIBCPP_NO_EXCEPTIONS
         __state_->__release_shared();
     }
 }
diff --git a/libcxx/include/ios b/libcxx/include/ios
--- a/libcxx/include/ios
+++ b/libcxx/include/ios
@@ -425,6 +425,7 @@
     return error_condition(static_cast<int>(__e), iostream_category());
 }
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 class _LIBCPP_EXCEPTION_ABI ios_base::failure
     : public system_error
 {
@@ -434,6 +435,7 @@
     failure(const failure&) _NOEXCEPT = default;
     virtual ~failure() _NOEXCEPT;
 };
+#endif
 
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
 void __throw_failure(char const* __msg) {
diff --git a/libcxx/include/regex b/libcxx/include/regex
--- a/libcxx/include/regex
+++ b/libcxx/include/regex
@@ -980,6 +980,7 @@
 
 }  // regex_constants
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 class _LIBCPP_EXCEPTION_ABI regex_error
     : public runtime_error
 {
@@ -991,6 +992,7 @@
      _LIBCPP_INLINE_VISIBILITY
     regex_constants::error_type code() const {return __code_;}
 };
+#endif
 
 template <regex_constants::error_type _Ev>
 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
diff --git a/libcxx/include/stdexcept b/libcxx/include/stdexcept
--- a/libcxx/include/stdexcept
+++ b/libcxx/include/stdexcept
@@ -73,6 +73,7 @@
 namespace std  // purposefully not using versioning namespace
 {
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 class _LIBCPP_EXCEPTION_ABI logic_error
     : public exception
 {
@@ -208,6 +209,7 @@
     virtual ~underflow_error() _NOEXCEPT;
 #endif
 };
+#endif // _LIBCPP_NO_EXCEPTIONS
 
 }  // std
 
diff --git a/libcxx/include/system_error b/libcxx/include/system_error
--- a/libcxx/include/system_error
+++ b/libcxx/include/system_error
@@ -459,6 +459,7 @@
 
 // system_error
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 class _LIBCPP_TYPE_VIS system_error
     : public runtime_error
 {
@@ -479,6 +480,7 @@
 private:
     static string __init(const error_code&, string);
 };
+#endif
 
 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS
 void __throw_system_error(int ev, const char* what_arg);
diff --git a/libcxx/src/filesystem/operations.cpp b/libcxx/src/filesystem/operations.cpp
--- a/libcxx/src/filesystem/operations.cpp
+++ b/libcxx/src/filesystem/operations.cpp
@@ -665,6 +665,7 @@
 #endif // CLOCK_REALTIME
 }
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 filesystem_error::~filesystem_error() {}
 
 void filesystem_error::__create_what(int __num_paths) {
@@ -683,6 +684,7 @@
     _LIBCPP_UNREACHABLE();
   }();
 }
+#endif
 
 static path __do_absolute(const path& p, path* cwd, error_code* ec) {
   if (ec)
diff --git a/libcxx/src/format.cpp b/libcxx/src/format.cpp
--- a/libcxx/src/format.cpp
+++ b/libcxx/src/format.cpp
@@ -12,8 +12,12 @@
 
 #if _LIBCPP_STD_VER > 17
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
+
 format_error::~format_error() noexcept = default;
 
-#endif //_LIBCPP_STD_VER > 17
+#endif // _LIBCPP_NO_EXCEPTIONS
+
+#endif // _LIBCPP_STD_VER > 17
 
 _LIBCPP_END_NAMESPACE_STD
diff --git a/libcxx/src/future.cpp b/libcxx/src/future.cpp
--- a/libcxx/src/future.cpp
+++ b/libcxx/src/future.cpp
@@ -71,6 +71,7 @@
     return __f;
 }
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 future_error::future_error(error_code __ec)
     : logic_error(__ec.message()),
       __ec_(__ec)
@@ -80,6 +81,7 @@
 future_error::~future_error() noexcept
 {
 }
+#endif // _LIBCPP_NO_EXCEPTIONS
 
 void
 __assoc_sub_state::__on_zero_shared() noexcept
diff --git a/libcxx/src/ios.cpp b/libcxx/src/ios.cpp
--- a/libcxx/src/ios.cpp
+++ b/libcxx/src/ios.cpp
@@ -58,6 +58,8 @@
 
 // ios_base::failure
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
+
 ios_base::failure::failure(const string& msg, const error_code& ec)
     : system_error(ec, msg)
 {
@@ -72,6 +74,8 @@
 {
 }
 
+#endif // _LIBCPP_NO_EXCEPTIONS
+
 // ios_base locale
 
 const ios_base::fmtflags ios_base::boolalpha;
diff --git a/libcxx/src/optional.cpp b/libcxx/src/optional.cpp
--- a/libcxx/src/optional.cpp
+++ b/libcxx/src/optional.cpp
@@ -27,6 +27,7 @@
 //  Even though it no longer exists in a header file
 _LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
 class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS bad_optional_access
     : public std::logic_error
 {
@@ -38,5 +39,6 @@
 };
 
 bad_optional_access::~bad_optional_access() noexcept = default;
+#endif // _LIBCPP_NO_EXCEPTIONS
 
 _LIBCPP_END_NAMESPACE_EXPERIMENTAL
diff --git a/libcxx/src/regex.cpp b/libcxx/src/regex.cpp
--- a/libcxx/src/regex.cpp
+++ b/libcxx/src/regex.cpp
@@ -12,6 +12,8 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
+
 static
 const char*
 make_error_type_string(regex_constants::error_type ecode)
@@ -68,6 +70,8 @@
 
 regex_error::~regex_error() throw() {}
 
+#endif // _LIBCPP_NO_EXCEPTIONS
+
 namespace {
 
 struct collationnames
diff --git a/libcxx/src/string.cpp b/libcxx/src/string.cpp
--- a/libcxx/src/string.cpp
+++ b/libcxx/src/string.cpp
@@ -50,13 +50,17 @@
 inline
 void throw_from_string_out_of_range( const string& func )
 {
+#ifndef _LIBCPP_NO_EXCEPTIONS
     throw_helper<out_of_range>(func + ": out of range");
+#endif
 }
 
 inline
 void throw_from_string_invalid_arg( const string& func )
 {
+#ifndef _LIBCPP_NO_EXCEPTIONS
     throw_helper<invalid_argument>(func + ": no conversion");
+#endif
 }
 
 // as_integer
diff --git a/libcxx/src/support/runtime/stdexcept_default.ipp b/libcxx/src/support/runtime/stdexcept_default.ipp
--- a/libcxx/src/support/runtime/stdexcept_default.ipp
+++ b/libcxx/src/support/runtime/stdexcept_default.ipp
@@ -19,6 +19,8 @@
 namespace std // purposefully not using versioning namespace
 {
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
+
 logic_error::logic_error(const string& msg) : __imp_(msg.c_str()) {}
 
 logic_error::logic_error(const char* msg) : __imp_(msg) {}
@@ -59,6 +61,8 @@
 overflow_error::~overflow_error() noexcept {}
 underflow_error::~underflow_error() noexcept {}
 
-#endif
+#endif // !defined(_LIBCPPABI_VERSION) && !defined(LIBSTDCXX)
+
+#endif // _LIBCPP_NO_EXCEPTIONS
 
 } // namespace std
diff --git a/libcxx/src/system_error.cpp b/libcxx/src/system_error.cpp
--- a/libcxx/src/system_error.cpp
+++ b/libcxx/src/system_error.cpp
@@ -228,6 +228,8 @@
 
 // system_error
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
+
 string
 system_error::__init(const error_code& ec, string what_arg)
 {
@@ -280,6 +282,8 @@
 {
 }
 
+#endif // _LIBCPP_NO_EXCEPTIONS
+
 void
 __throw_system_error(int ev, const char* what_arg)
 {
diff --git a/libcxxabi/src/stdlib_stdexcept.cpp b/libcxxabi/src/stdlib_stdexcept.cpp
--- a/libcxxabi/src/stdlib_stdexcept.cpp
+++ b/libcxxabi/src/stdlib_stdexcept.cpp
@@ -21,6 +21,8 @@
 namespace std  // purposefully not using versioning namespace
 {
 
+#ifndef _LIBCPP_NO_EXCEPTIONS
+
 logic_error::~logic_error() noexcept {}
 
 const char*
@@ -46,4 +48,6 @@
 overflow_error::~overflow_error() noexcept {}
 underflow_error::~underflow_error() noexcept {}
 
+#endif // _LIBCPP_NO_EXCEPTIONS
+
 }  // std