make source location happy on macos

* because of course apple doesn't provide any implementation (lmao) we provide one ourself

llarp/util/logging/source_location.hpp

@@ -4,6 +4,69 @@
 #include <source_location>
 namespace slns = std;
 #else
+#ifdef __APPLE__
+namespace slns
+{
+  struct source_location
+  {
+   public:
+    static constexpr source_location
+    current(
+        const char* fileName = __builtin_FILE(),
+        const char* functionName = __builtin_FUNCTION(),
+        const uint_least32_t lineNumber = __builtin_LINE(),
+        const uint_least32_t columnOffset = __builtin_COLUMN()) noexcept
+    {
+      return source_location{fileName, functionName, lineNumber, columnOffset};
+    }
+
+    source_location(const source_location&) = default;
+    source_location(source_location&&) = default;
+
+    constexpr const char*
+    file_name() const noexcept
+    {
+      return fileName;
+    }
+
+    constexpr const char*
+    function_name() const noexcept
+    {
+      return functionName;
+    }
+
+    constexpr uint_least32_t
+    line() const noexcept
+    {
+      return lineNumber;
+    }
+
+    constexpr std::uint_least32_t
+    column() const noexcept
+    {
+      return columnOffset;
+    }
+
+   private:
+    constexpr explicit source_location(
+        const char* fileName,
+        const char* functionName,
+        const uint_least32_t lineNumber,
+        const uint_least32_t columnOffset) noexcept
+        : fileName(fileName)
+        , functionName(functionName)
+        , lineNumber(lineNumber)
+        , columnOffset(columnOffset)
+    {}
+
+    const char* fileName;
+    const char* functionName;
+    const std::uint_least32_t lineNumber;
+    const std::uint_least32_t columnOffset;
+  };
+}  // namespace slns
+#else
 #include <experimental/source_location>
 namespace slns = std::experimental;
 #endif
+#endif