From eb6c649d47714f820633e1b54d2ae92b11f1cdaa Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@gmail.com>
Date: Tue, 29 Nov 2022 08:34:51 +0100
Subject: [PATCH] lib/fmt/SystemError: add concept check to work around
 ambiguous overloads

---
 src/lib/fmt/SystemError.hxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/lib/fmt/SystemError.hxx b/src/lib/fmt/SystemError.hxx
index 6cab0a387..4fa66691d 100644
--- a/src/lib/fmt/SystemError.hxx
+++ b/src/lib/fmt/SystemError.hxx
@@ -36,6 +36,8 @@
 #include <fmt/format.h>
 #endif
 
+#include <type_traits>
+
 [[nodiscard]] [[gnu::pure]]
 std::system_error
 VFmtSystemError(std::error_code code,
@@ -92,6 +94,7 @@ FmtLastError(const S &format_str, Args&&... args) noexcept
 #endif // _WIN32
 
 template<typename S, typename... Args>
+requires(std::is_convertible_v<S, fmt::string_view>)
 [[nodiscard]] [[gnu::pure]]
 std::system_error
 FmtErrno(int code, const S &format_str, Args&&... args) noexcept
@@ -101,6 +104,7 @@ FmtErrno(int code, const S &format_str, Args&&... args) noexcept
 }
 
 template<typename S, typename... Args>
+requires(std::is_convertible_v<S, fmt::string_view>)
 [[nodiscard]] [[gnu::pure]]
 std::system_error
 FmtErrno(const S &format_str, Args&&... args) noexcept
@@ -109,6 +113,7 @@ FmtErrno(const S &format_str, Args&&... args) noexcept
 }
 
 template<typename S, typename... Args>
+requires(std::is_convertible_v<S, fmt::string_view>)
 [[nodiscard]] [[gnu::pure]]
 std::system_error
 FmtFileNotFound(const S &format_str, Args&&... args) noexcept