add missing functions defined as inline, remove '_BUILD_STD_MODULE'

Author: siradam7th

libcxx/modules/std.compat/ctime.inc

@@ -27,4 +27,44 @@ export {
   using ::time _LIBCPP_USING_IF_EXISTS;
   using ::timespec_get _LIBCPP_USING_IF_EXISTS;
 #endif
+
+// A workaround for UCRT because it defines these functions
+// as static and that causes the error "internal linkage cannot be exported"
+#ifdef _LIBCPP_ABI_VCRUNTIME
+
+  template <int = 0>
+  inline char* __CRTDECL ctime(_In_ time_t const* const _Time) noexcept {
+    return _ctime64(_Time);
+  }
+
+  template <int = 0>
+  inline double __CRTDECL difftime(_In_ time_t const _Time1, _In_ time_t const _Time2) noexcept {
+    return _difftime64(_Time1, _Time2);
+  }
+
+  template <int = 0>
+  inline tm* __CRTDECL gmtime(_In_ time_t const* const _Time) noexcept {
+    return _gmtime64(_Time);
+  }
+
+  template <int = 0>
+  inline tm* __CRTDECL localtime(_In_ time_t const* const _Time) noexcept {
+    return _localtime64(_Time);
+  }
+
+  template <int = 0>
+  inline time_t __CRTDECL mktime(_Inout_ tm* const _Tm) noexcept {
+    return _mktime64(_Tm);
+  }
+
+  template <int = 0>
+  inline time_t __CRTDECL time(_Out_opt_ time_t* const _Time) noexcept {
+    return _time64(_Time);
+  }
+
+  template <int = 0>
+  inline int __CRTDECL timespec_get(_Out_ timespec* const _Ts, _In_ int const _Base) noexcept {
+    return _timespec64_get(reinterpret_cast<_timespec64*>(_Ts), _Base);
+  }
+#endif
 } // export

libcxx/modules/std.cppm.in

@@ -51,9 +51,6 @@ module;
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
-#ifdef _LIBCPP_ABI_VCRUNTIME
-#define _BUILD_STD_MODULE
-#endif
 #include <ctime>
 #include <cuchar>
 #include <cwchar>

libcxx/modules/std/ctime.inc

@@ -14,6 +14,7 @@ export namespace std {
 
   using std::timespec _LIBCPP_USING_IF_EXISTS;
   using std::tm _LIBCPP_USING_IF_EXISTS;
+
   using std::asctime _LIBCPP_USING_IF_EXISTS;
   using std::clock _LIBCPP_USING_IF_EXISTS;
   using std::strftime _LIBCPP_USING_IF_EXISTS;
@@ -27,4 +28,44 @@ export namespace std {
   using std::time _LIBCPP_USING_IF_EXISTS;
   using std::timespec_get _LIBCPP_USING_IF_EXISTS;
 #endif
+
+// A workaround for UCRT because it defines these functions
+// as static and that causes the error "internal linkage cannot be exported"
+#ifdef _LIBCPP_ABI_VCRUNTIME
+
+  template <int = 0>
+  inline char* __CRTDECL ctime(_In_ time_t const* const _Time) noexcept {
+    return _ctime64(_Time);
+  }
+
+  template <int = 0>
+  inline double __CRTDECL difftime(_In_ time_t const _Time1, _In_ time_t const _Time2) noexcept {
+    return _difftime64(_Time1, _Time2);
+  }
+
+  template <int = 0>
+  inline tm* __CRTDECL gmtime(_In_ time_t const* const _Time) noexcept {
+    return _gmtime64(_Time);
+  }
+
+  template <int = 0>
+  inline tm* __CRTDECL localtime(_In_ time_t const* const _Time) noexcept {
+    return _localtime64(_Time);
+  }
+
+  template <int = 0>
+  inline time_t __CRTDECL mktime(_Inout_ tm* const _Tm) noexcept {
+    return _mktime64(_Tm);
+  }
+
+  template <int = 0>
+  inline time_t __CRTDECL time(_Out_opt_ time_t* const _Time) noexcept {
+    return _time64(_Time);
+  }
+
+  template <int = 0>
+  inline int __CRTDECL timespec_get(_Out_ timespec* const _Ts, _In_ int const _Base) noexcept {
+    return _timespec64_get(reinterpret_cast<_timespec64*>(_Ts), _Base);
+  }
+#endif
 } // namespace std