From 90b318105fc820a949cd2d923bb47a00a127766b Mon Sep 17 00:00:00 2001
From: Jarryd Beck <jarro.2783@gmail.com>
Date: Thu, 15 Jun 2023 07:01:07 +1000
Subject: [PATCH] Fix unannoted fallthrough

Fixes #402.
---
 include/cxxopts.hpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index 212fe8e..062c17c 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -73,6 +73,14 @@ THE SOFTWARE.
 #  endif
 #endif
 
+#define CXXOPTS_FALLTHROUGH
+#ifdef __has_cpp_attribute
+  #if __has_cpp_attribute(fallthrough)
+    #undef CXXOPTS_FALLTHROUGH
+    #define CXXOPTS_FALLTHROUGH [[fallthrough]]
+  #endif
+#endif
+
 #if __cplusplus >= 201603L
 #define CXXOPTS_NODISCARD [[nodiscard]]
 #else
@@ -2239,6 +2247,7 @@ OptionAdder::operator()
   case 1:
     short_name = *first_short_name_iter;
     option_names.erase(first_short_name_iter);
+    CXXOPTS_FALLTHROUGH;
   case 0:
     break;
   default: