From d318d9cce441dc5459e84c340eda311eb7be7880 Mon Sep 17 00:00:00 2001
From: "Jason C.H" <ctrysbita@outlook.com>
Date: Sat, 8 Mar 2025 23:09:29 +0800
Subject: [PATCH] ggml-backend : make path_str compatible with C++20

---
 AUTHORS                       | 1 +
 ggml/src/ggml-backend-reg.cpp | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/AUTHORS b/AUTHORS
index 6796b29413595..ddcb156388bf0 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1045,3 +1045,4 @@ zrm <trustiosity.zrm@gmail.com>
 蕭澧邦 <45505768+shou692199@users.noreply.github.com>
 谢乃闻 <sienaiwun@users.noreply.github.com>
 Нияз Гарифзянов <112617865+garrnizon@users.noreply.github.com>
+Jason C.H <ctrysbita@outlook.com>
diff --git a/ggml/src/ggml-backend-reg.cpp b/ggml/src/ggml-backend-reg.cpp
index d0d68becd89db..9bedeae78affb 100644
--- a/ggml/src/ggml-backend-reg.cpp
+++ b/ggml/src/ggml-backend-reg.cpp
@@ -76,7 +76,14 @@ namespace fs = std::filesystem;
 static std::string path_str(const fs::path & path) {
     std::string u8path;
     try {
+#if defined(__cpp_lib_char8_t)
+        // C++20 and later: u8string() returns std::u8string
+        std::u8string u8str = path.u8string();
+        u8path = std::string(reinterpret_cast<const char*>(u8str.c_str()));
+#else
+        // C++17: u8string() returns std::string
         u8path = path.u8string();
+#endif
     } catch (...) {
     }
     return u8path;