fix(Core/Misc): Remove Clang 7 workaround (#10521)

src/cmake/compiler/clang/settings.cmake

@@ -46,13 +46,6 @@ int main()
 }
 " CLANG_HAVE_PROPER_CHARCONV)
 
-if (NOT CLANG_HAVE_PROPER_CHARCONV)
-  message(STATUS "Clang: Detected from_chars bug for 64-bit integers, workaround enabled")
-  target_compile_definitions(acore-compile-option-interface
-  INTERFACE
-    -DACORE_NEED_CHARCONV_WORKAROUND)
-endif()
-
 if(WITH_WARNINGS)
   target_compile_options(acore-warning-interface
     INTERFACE

src/common/Utilities/StringConvert.h

@@ -90,71 +90,6 @@ namespace Acore::Impl::StringConvertImpl
         }
     };
 
-#ifdef ACORE_NEED_CHARCONV_WORKAROUND
-    /*
-        If this is defined, std::from_chars will cause linkage errors for 64-bit types.
-        (This is a bug in clang-7.)
-
-        If the clang requirement is bumped to >= clang-8, remove this ifdef block and its
-        associated check in cmake/compiler/clang/settings.cmake
-    */
-    template <>
-    struct For<uint64, void>
-    {
-        static Optional<uint64> FromString(std::string_view str, int base = 10)
-        {
-            if (str.empty())
-            {
-                return std::nullopt;
-            }
-            try
-            {
-                size_t n;
-                uint64 val = std::stoull(std::string(str), &n, base);
-                if (n != str.length())
-                {
-                    return std::nullopt;
-                }
-                return val;
-            }
-            catch (...) { return std::nullopt; }
-        }
-
-        static std::string ToString(uint64 val)
-        {
-            return std::to_string(val);
-        }
-    };
-
-    template <>
-    struct For<int64, void>
-    {
-        static Optional<int64> FromString(std::string_view str, int base = 10)
-        {
-            try
-            {
-                if (str.empty())
-                {
-                    return std::nullopt;
-                }
-                size_t n;
-                int64 val = std::stoll(std::string(str), &n, base);
-                if (n != str.length())
-                {
-                    return std::nullopt;
-                }
-                return val;
-            }
-            catch (...) { return std::nullopt; }
-        }
-
-        static std::string ToString(int64 val)
-        {
-            return std::to_string(val);
-        }
-    };
-#endif
-
     template <>
     struct For<bool, void>
     {