From 4f7f3f2147827715e685321874081a0a6683b0af Mon Sep 17 00:00:00 2001
From: Luke Street <luke@street.dev>
Date: Wed, 30 Jun 2021 16:22:27 -0400
Subject: [PATCH] Use __has_cpp_attribute for NOWIDE_FALLTHROUGH

---
 include/nowide/config.hpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/nowide/config.hpp b/include/nowide/config.hpp
index 26b8287..e190d0f 100644
--- a/include/nowide/config.hpp
+++ b/include/nowide/config.hpp
@@ -58,8 +58,14 @@
 #define NOWIDE_USE_FILEBUF_REPLACEMENT 0
 #endif
 
-#if defined(__GNUC__) && __GNUC__ >= 7
-#define NOWIDE_FALLTHROUGH __attribute__((fallthrough))
+#if defined(__has_cpp_attribute)
+#define NOWIDE_HAS_CPP_ATTRIBUTE(attr) __has_cpp_attribute(attr)
+#else
+#define NOWIDE_HAS_CPP_ATTRIBUTE(attr) (0)
+#endif
+
+#if NOWIDE_HAS_CPP_ATTRIBUTE(fallthrough)
+#define NOWIDE_FALLTHROUGH [[fallthrough]]
 #else
 #define NOWIDE_FALLTHROUGH
 #endif