Fixed static_assert

include/spdlog/details/logger_impl.h

@@ -175,7 +175,7 @@ inline void spdlog::logger::critical(const T &msg)
 }
 
 #ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
-static_assert(_WIN32, "SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows");
+
 inline void wbuf_to_utf8buf(const fmt::wmemory_buffer &wbuf, fmt::memory_buffer &target)
 {
     int wbuf_size = static_cast<int>(wbuf.size());

include/spdlog/logger.h

@@ -68,6 +68,9 @@ public:
     void critical(const char *fmt, const Args &... args);
 
 #ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+#ifndef _WIN32
+#error SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows
+#else
     template<typename... Args>
     void log(level::level_enum lvl, const wchar_t *fmt, const Args &... args);
 
@@ -88,6 +91,7 @@ public:
 
     template<typename... Args>
     void critical(const wchar_t *fmt, const Args &... args);
+#endif // _WIN32
 #endif // SPDLOG_WCHAR_TO_UTF8_SUPPORT
 
     template<typename T>