Various cleanups: extern "C"

.clang-format

@@ -271,8 +271,6 @@ StatementMacros:
   - _STDEXT_END
   - _FMT_P2286_BEGIN
   - _FMT_P2286_END
-  - _EXTERN_C
-  - _END_EXTERN_C
   - _EXTERN_C_UNLESS_PURE
   - _END_EXTERN_C_UNLESS_PURE
 # TabWidth:        8

stl/inc/__msvc_print.hpp

@@ -22,7 +22,7 @@ _STL_DISABLE_CLANG_WARNINGS
 #pragma push_macro("new")
 #undef new
 
-_EXTERN_C
+extern "C" {
 
 enum class __std_unicode_console_handle : intptr_t { _Invalid = -1 };
 
@@ -55,7 +55,7 @@ _NODISCARD _Success_(return == __std_win_error::_Success) __std_win_error
     __stdcall __std_print_to_unicode_console(_In_ __std_unicode_console_handle _Console_handle,
         _In_reads_(_Str_size) const char* _Str, _In_ size_t _Str_size) noexcept;
 
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 

stl/inc/__msvc_sanitizer_annotate_container.hpp

@@ -125,13 +125,13 @@ extern const bool _Asan_vector_should_annotate;
 #ifdef _INSERT_STRING_ANNOTATION
 extern const bool _Asan_string_should_annotate;
 #endif
-}
+} // extern "C"
 
 #if defined(_INSERT_VECTOR_ANNOTATION) || defined(_INSERT_STRING_ANNOTATION)
 extern "C" {
 void __cdecl __sanitizer_annotate_contiguous_container(
     const void* _First, const void* _End, const void* _Old_last, const void* _New_last) noexcept;
-}
+} // extern "C"
 
 #ifdef _M_ARM64EC
 #pragma comment(linker, \

stl/inc/__msvc_system_error_abi.hpp

@@ -22,14 +22,14 @@ _STL_DISABLE_CLANG_WARNINGS
 #define __CLRCALL_PURE_OR_STDCALL __stdcall
 #endif
 
-_EXTERN_C
+extern "C" {
 _NODISCARD size_t __CLRCALL_PURE_OR_STDCALL __std_get_string_size_without_trailing_whitespace(
     const char* _Str, size_t _Size) noexcept;
 
 _NODISCARD size_t __CLRCALL_PURE_OR_STDCALL __std_system_error_allocate_message(
     unsigned long _Message_id, char** _Ptr_str) noexcept;
 void __CLRCALL_PURE_OR_STDCALL __std_system_error_deallocate_message(char* _Str) noexcept;
-_END_EXTERN_C
+} // extern "C"
 
 #pragma pop_macro("new")
 _STL_RESTORE_CLANG_WARNINGS

stl/inc/__msvc_tzdb.hpp

@@ -19,7 +19,7 @@ _STL_DISABLE_CLANG_WARNINGS
 #pragma push_macro("new")
 #undef new
 
-_EXTERN_C
+extern "C" {
 
 using __std_tzdb_epoch_milli = double;
 
@@ -92,7 +92,7 @@ void __stdcall __std_tzdb_delete_leap_seconds(__std_tzdb_leap_info* _Info) noexc
 _NODISCARD void* __stdcall __std_calloc_crt(size_t _Count, size_t _Size) noexcept;
 void __stdcall __std_free_crt(void* _Ptr) noexcept;
 
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 

stl/inc/algorithm

@@ -28,7 +28,7 @@ _STL_DISABLE_CLANG_WARNINGS
 
 #if _USE_STD_VECTOR_ALGORITHMS
 
-_EXTERN_C
+extern "C" {
 struct _Min_max_element_t {
     const void* _Min;
     const void* _Max;
@@ -59,7 +59,7 @@ const void* __stdcall __std_find_last_trivial_1(const void* _First, const void*
 const void* __stdcall __std_find_last_trivial_2(const void* _First, const void* _Last, uint16_t _Val) noexcept;
 const void* __stdcall __std_find_last_trivial_4(const void* _First, const void* _Last, uint32_t _Val) noexcept;
 const void* __stdcall __std_find_last_trivial_8(const void* _First, const void* _Last, uint64_t _Val) noexcept;
-_END_EXTERN_C
+} // extern "C"
 
 template <class _Ty>
 _STD pair<_Ty*, _Ty*> __std_minmax_element(_Ty* _First, _Ty* _Last) noexcept {

stl/inc/atomic

@@ -83,6 +83,7 @@ extern "C" _NODISCARD char __stdcall __std_atomic_has_cmpxchg16b() noexcept;
 // should be mirrored. Also: if any macros are added they should be
 // #undefed in vcruntime as well
 
+extern "C" {
 enum {
     _Atomic_memory_order_relaxed,
     _Atomic_memory_order_consume,
@@ -91,6 +92,7 @@ enum {
     _Atomic_memory_order_acq_rel,
     _Atomic_memory_order_seq_cst,
 };
+} // extern "C"
 
 #ifndef _INVALID_MEMORY_ORDER
 #ifdef _DEBUG
@@ -282,9 +284,9 @@ extern "C" inline void _Atomic_thread_fence(const unsigned int _Order) noexcept
 
 // End of code shared with vcruntime
 
-_EXTERN_C
+extern "C" {
 _Smtx_t* __stdcall __std_atomic_get_mutex(const void* _Key) noexcept;
-_END_EXTERN_C
+} // extern "C"
 // Padding bits should not participate in cmpxchg comparison starting in C++20.
 // Clang does not have __builtin_zero_non_value_bits to exclude these bits to implement this C++20 feature.
 // The EDG front-end substitutes everything and runs into incomplete types passed to atomic<T>.

stl/inc/cmath

@@ -911,7 +911,7 @@ _EXPORT_STD using _CSTD isunordered;
 _STD_END
 
 #if _HAS_CXX17
-_EXTERN_C
+extern "C" {
 _NODISCARD _CRT_SATELLITE_2 double __stdcall __std_smf_assoc_laguerre(unsigned int, unsigned int, double) noexcept;
 _NODISCARD _CRT_SATELLITE_2 float __stdcall __std_smf_assoc_laguerref(unsigned int, unsigned int, float) noexcept;
 _NODISCARD _CRT_SATELLITE_2 double __stdcall __std_smf_assoc_legendre(unsigned int, unsigned int, double) noexcept;
@@ -956,7 +956,7 @@ _NODISCARD _CRT_SATELLITE_2 double __stdcall __std_smf_sph_neumann(unsigned int,
 _NODISCARD _CRT_SATELLITE_2 float __stdcall __std_smf_sph_neumannf(unsigned int, float) noexcept;
 _NODISCARD _CRT_SATELLITE_2 double __stdcall __std_smf_hypot3(double, double, double) noexcept;
 _NODISCARD _CRT_SATELLITE_2 float __stdcall __std_smf_hypot3f(float, float, float) noexcept;
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 _EXPORT_STD _NODISCARD inline double assoc_laguerre(

stl/inc/complex

@@ -40,6 +40,7 @@ _STL_DISABLE_CLANG_WARNINGS
 #ifndef _C_COMPLEX_T
 #define _C_COMPLEX_T // Also defined by UCRT <complex.h>
 
+extern "C" {
 struct _C_double_complex {
     double _Val[2];
 };
@@ -51,6 +52,7 @@ struct _C_float_complex {
 struct _C_ldouble_complex {
     long double _Val[2];
 };
+} // extern "C"
 #endif // _C_COMPLEX_T
 
 // complex _Val offsets

stl/inc/execution

@@ -27,7 +27,7 @@ _STL_DISABLE_CLANG_WARNINGS
 #pragma push_macro("new")
 #undef new
 
-_EXTERN_C
+extern "C" {
 #ifdef _M_CEE
 using __std_TP_WORK              = void;
 using __std_TP_CALLBACK_INSTANCE = void;
@@ -62,7 +62,7 @@ void __stdcall __std_execution_wait_on_uchar(
     _In_ const volatile unsigned char* _Address, _In_ unsigned char _Compare) noexcept;
 
 void __stdcall __std_execution_wake_by_address_all(_In_ const volatile void* _Address) noexcept;
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 inline constexpr size_t _Oversubscription_multiplier = 32;

stl/inc/memory

@@ -3717,10 +3717,10 @@ _NODISCARD_ASSUME_ALIGNED constexpr _Ty* assume_aligned(_Ty* const _Ptr) noexcep
 }
 #endif // _HAS_CXX20
 
-_EXTERN_C
+extern "C" {
 _CRTIMP2_PURE void __cdecl _Lock_shared_ptr_spin_lock() noexcept;
 _CRTIMP2_PURE void __cdecl _Unlock_shared_ptr_spin_lock() noexcept;
-_END_EXTERN_C
+} // extern "C"
 
 struct _Shared_ptr_spin_lock { // class to manage a spin lock for shared_ptr atomic operations
     _Shared_ptr_spin_lock() { // lock the spin lock

stl/inc/stacktrace

@@ -39,12 +39,12 @@ _STL_DISABLE_CLANG_WARNINGS
 // string buffer for cases when the size is not known before an attempt to fill it -- this potentially avoids both an
 // extra fill attempt and an extra allocation if the reserved size is enough.
 
+extern "C" {
 using _Stacktrace_string_fill_callback = size_t(__stdcall*)(char* _Data, size_t _Size, void* _Context) _NOEXCEPT_FNPTR;
 
 using _Stacktrace_string_fill = size_t(__stdcall*)(
     size_t _Size, void* _String, void* _Context, _Stacktrace_string_fill_callback _Callback);
 
-_EXTERN_C
 _NODISCARD unsigned short __stdcall __std_stacktrace_capture(unsigned long _Frames_to_skip,
     unsigned long _Frames_to_capture, void** _Back_trace, unsigned long* _Back_trace_hash) noexcept;
 
@@ -64,7 +64,7 @@ _NODISCARD unsigned int __stdcall __std_stacktrace_source_line(const void* _Addr
 
 void __stdcall __std_stacktrace_to_string(
     const void* const* _Addresses, size_t _Size, void* _Str, _Stacktrace_string_fill _Fill) noexcept(false);
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 inline size_t __stdcall _Stacktrace_string_fill_impl(

stl/inc/syncstream

@@ -24,10 +24,10 @@ _STL_DISABLE_CLANG_WARNINGS
 #undef new
 #undef emit
 
-_EXTERN_C
+extern "C" {
 _NODISCARD _STD shared_mutex* __stdcall __std_acquire_shared_mutex_for_instance(void* _Ptr) noexcept;
 void __stdcall __std_release_shared_mutex_for_instance(void* _Ptr) noexcept;
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 

stl/inc/system_error

@@ -711,9 +711,9 @@ _EXPORT_STD _NODISCARD inline const error_category& system_category() noexcept {
 _STD_END
 
 #if _HAS_CXX17
-_EXTERN_C
+extern "C" {
 enum class __std_win_error : unsigned long;
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 // We would really love to use the proper way of building error_code by specializing

stl/inc/xatomic_wait.h

@@ -21,7 +21,7 @@ _STL_DISABLE_CLANG_WARNINGS
 _INLINE_VAR constexpr unsigned long long _Atomic_wait_no_deadline = 0xFFFF'FFFF'FFFF'FFFF;
 _INLINE_VAR constexpr unsigned long _Atomic_wait_no_timeout       = 0xFFFF'FFFF; // Pass as partial timeout
 
-_EXTERN_C
+extern "C" {
 enum class __std_atomic_api_level : unsigned long {
     __not_set,
     __detecting,
@@ -61,7 +61,7 @@ void __stdcall __std_atomic_notify_all_indirect(const void* _Storage) noexcept;
 unsigned long long __stdcall __std_atomic_wait_get_deadline(unsigned long long _Timeout) noexcept;
 unsigned long __stdcall __std_atomic_wait_get_remaining_timeout(unsigned long long _Deadline) noexcept;
 
-_END_EXTERN_C
+} // extern "C"
 
 #pragma pop_macro("new")
 _STL_RESTORE_CLANG_WARNINGS

stl/inc/xfilesystem_abi.h

@@ -18,7 +18,7 @@ _STL_DISABLE_CLANG_WARNINGS
 #pragma push_macro("new")
 #undef new
 
-_EXTERN_C
+extern "C" {
 inline constexpr size_t __std_fs_max_path      = 260; // #define MAX_PATH          260
 inline constexpr size_t __std_fs_temp_path_max = __std_fs_max_path + 1;
 
@@ -76,11 +76,11 @@ enum class __std_fs_file_attr : unsigned long {
 
     _Invalid = 0xFFFFFFFF, // #define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
 };
-_END_EXTERN_C
+} // extern "C"
 
 _BITMASK_OPS(_EMPTY_ARGUMENT, __std_fs_file_attr)
 
-_EXTERN_C
+extern "C" {
 enum class __std_fs_reparse_tag : unsigned long {
     _None        = 0,
     _Mount_point = (0xA0000003L), // #define IO_REPARSE_TAG_MOUNT_POINT              (0xA0000003L)
@@ -121,11 +121,11 @@ enum class __std_fs_stats_flags : unsigned long {
 
     _All_data = _Attributes | _Reparse_tag | _File_size | _Link_count | _Last_write_time
 };
-_END_EXTERN_C
+} // extern "C"
 
 _BITMASK_OPS(_EMPTY_ARGUMENT, __std_fs_stats_flags)
 
-_EXTERN_C
+extern "C" {
 struct __std_fs_stats {
     long long _Last_write_time;
     unsigned long long _File_size;
@@ -197,21 +197,21 @@ enum class __std_access_rights : unsigned long {
     //                                   | FILE_WRITE_EA | FILE_APPEND_DATA | SYNCHRONIZE)
     _File_generic_write = 0x00120116,
 };
-_END_EXTERN_C
+} // extern "C"
 
 _BITMASK_OPS(_EMPTY_ARGUMENT, __std_access_rights)
 
-_EXTERN_C
+extern "C" {
 enum class __std_fs_file_flags : unsigned long {
     _None               = 0,
     _Backup_semantics   = 0x02000000, // #define FILE_FLAG_BACKUP_SEMANTICS      0x02000000
     _Open_reparse_point = 0x00200000, // #define FILE_FLAG_OPEN_REPARSE_POINT    0x00200000
 };
-_END_EXTERN_C
+} // extern "C"
 
 _BITMASK_OPS(_EMPTY_ARGUMENT, __std_fs_file_flags)
 
-_EXTERN_C
+extern "C" {
 enum class __std_fs_file_handle : intptr_t { _Invalid = -1 };
 
 enum class __std_code_page : unsigned int { _Acp = 0, _Utf8 = 65001 };
@@ -234,11 +234,11 @@ enum class __std_fs_copy_options {
     _Overwrite_existing = 0x2,
     _Update_existing    = 0x4,
 };
-_END_EXTERN_C
+} // extern "C"
 
 _BITMASK_OPS(_EMPTY_ARGUMENT, __std_fs_copy_options)
 
-_EXTERN_C
+extern "C" {
 _NODISCARD __std_ulong_and_error __stdcall __std_fs_get_full_path_name(_In_z_ const wchar_t* _Source,
     _In_ unsigned long _Target_size, _Out_writes_z_(_Target_size) wchar_t* _Target) noexcept;
 
@@ -352,7 +352,7 @@ _NODISCARD __std_win_error __stdcall __std_fs_resize_file(_In_z_ const wchar_t*
 
 _NODISCARD __std_win_error __stdcall __std_fs_space(_In_z_ const wchar_t* _Target, _Out_ uintmax_t* _Available,
     _Out_ uintmax_t* _Total_bytes, _Out_ uintmax_t* _Free_bytes) noexcept;
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 struct _Fs_file {

stl/inc/xlocinfo

@@ -81,7 +81,7 @@ _CRTIMP2_PURE wchar_t __CLRCALL_PURE_OR_CDECL _Towupper(wchar_t, const _Ctypevec
 
 _END_EXTERN_C_UNLESS_PURE
 
-_EXTERN_C
+extern "C" {
 // These _should_ be explicitly `noexcept` but cannot be made so here because
 // the primary declarations in the C runtime headers are not.
 
@@ -102,7 +102,7 @@ _ACRTIMP void* __cdecl _W_Gettnames();
 
 _Success_(return > 0) _ACRTIMP size_t __cdecl _Wcsftime(
     _Out_writes_z_(_Maxsize) wchar_t*, _In_ size_t _Maxsize, _In_z_ const wchar_t*, _In_ const tm*, _In_opt_ void*);
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 extern "C++" class _CRTIMP2_PURE_IMPORT _Timevec { // smart pointer to information used by _Strftime

stl/inc/xthreads.h

@@ -18,7 +18,7 @@ _STL_DISABLE_CLANG_WARNINGS
 #pragma push_macro("new")
 #undef new
 
-_EXTERN_C
+extern "C" {
 using _Thrd_id_t = unsigned int;
 struct _Thrd_t { // thread identifier for Win32
     void* _Hnd; // Win32 HANDLE
@@ -130,7 +130,7 @@ _CRTIMP2_PURE _Thrd_result __cdecl _Cnd_signal(_Cnd_t) noexcept; // TRANSITION,
 _CRTIMP2_PURE void __cdecl _Cnd_register_at_thread_exit(_Cnd_t, _Mtx_t, int*) noexcept;
 _CRTIMP2_PURE void __cdecl _Cnd_unregister_at_thread_exit(_Mtx_t) noexcept;
 _CRTIMP2_PURE void __cdecl _Cnd_do_broadcast_at_thread_exit() noexcept;
-_END_EXTERN_C
+} // extern "C"
 
 _STD_BEGIN
 enum { // constants for error codes

stl/inc/xtimec.h

@@ -17,7 +17,7 @@ _STL_DISABLE_CLANG_WARNINGS
 #pragma push_macro("new")
 #undef new
 
-_EXTERN_C
+extern "C" {
 
 #ifdef _CRTBLD
 _CRTIMP2_PURE long __cdecl _Xtime_diff_to_millis2(const _timespec64*, const _timespec64*) noexcept;
@@ -33,7 +33,7 @@ void _Timespec64_get_sys(_timespec64*) noexcept;
 _CRTIMP2_PURE long long __cdecl _Query_perf_counter() noexcept;
 _CRTIMP2_PURE long long __cdecl _Query_perf_frequency() noexcept;
 
-_END_EXTERN_C
+} // extern "C"
 
 #pragma pop_macro("new")
 _STL_RESTORE_CLANG_WARNINGS