Patch support for clang till cpp20.

Signed-off-by: Toria <ninetailedtori@uwu.gal>

Author: ninetailedtori

src/include/millennium/logger.h

@@ -262,5 +262,19 @@ void CleanupLoggers();
 #define PRETTY_FUNCTION __PRETTY_FUNCTION__
 #endif
 
+#if defined(__clang__)
+#ifndef LOG_ERROR
+#define LOG_ERROR(...) logger.private_error_do_not_use(fmt, __sanitize_nt(__FILE__).data(), __LINE__, PRETTY_FUNCTION REST(__VA_ARGS__))
+#define FIRST(...) FIRST_HELPER(__VA_ARGS__, throwaway)
+#define FIRST_HELPER(first, ...) first
+#define REST(...) REST_HELPER(NUM(__VA_ARGS__), __VA_ARGS__)
+#define REST_HELPER(qty, ...) REST_HELPER2(qty, __VA_ARGS__)
+#define REST_HELPER2(qty, ...) REST_HELPER_##qty(__VA_ARGS__)
+#define REST_HELPER_ONE(first)
+#define REST_HELPER_TWOORMORE(first, ...) , __VA_ARGS__
+#define NUM(...) SELECT_10TH(__VA_ARGS__, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, ONE, throwaway)
+#define SELECT_10TH(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, ...) a10
+#endif
+#else
 #define LOG_ERROR(fmt, ...) logger.private_error_do_not_use(fmt, __sanitize_nt(__FILE__).data(), __LINE__, PRETTY_FUNCTION, ##__VA_ARGS__)
 #define GET_GITHUB_URL_FROM_HERE() fmt::format("{}/blob/{}{}#L{}", MILLENNIUM_REPOSITORY, GIT_COMMIT_HASH, __get_source_loc(__sanitize_nt(__FILE__).data()).data(), __LINE__)