From 3fbac8e2b7867611a2136d127fb83da768c731bc Mon Sep 17 00:00:00 2001
From: JamesReynolds <JamesReynolds>
Date: Fri, 1 Jun 2018 11:51:08 +0100
Subject: [PATCH] Closes #717

Failure to compile to systems that don't have a valid definition
of strerror_r.
---
 include/spdlog/details/os.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/spdlog/details/os.h b/include/spdlog/details/os.h
index a9246de2..08adca5d 100644
--- a/include/spdlog/details/os.h
+++ b/include/spdlog/details/os.h
@@ -397,6 +397,11 @@ inline std::string errno_to_string(char buf[256], int res)
     return "Unknown error";
 }
 
+inline std::string errno_to_string(char buf[256], const fmt::internal::Null<> &/*tag*/)
+{
+    return errno_to_string(buf, -1);
+}
+
 // Return errno string (thread safe)
 inline std::string errno_str(int err_num)
 {