From b43a3dbff8c615fec152e3fb2157961f3d90b705 Mon Sep 17 00:00:00 2001
From: James McCoy <jamessan@jamessan.com>
Date: Tue, 2 May 2017 23:58:04 -0400
Subject: Detect support for and use -Wimplicit-fallthrough

---
 CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4d1c0e8fd5..eb259bc983 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -221,6 +221,11 @@ else()
   add_definitions(-Wall -Wextra -pedantic -Wno-unused-parameter
     -Wstrict-prototypes -std=gnu99)
 
+  check_c_compiler_flag(-Wimplicit-fallthrough HAS_WIMPLICIT_FALLTHROUGH_FLAG)
+  if(HAS_WIMPLICIT_FALLTHROUGH_FLAG)
+    add_definitions(-Wimplicit-fallthrough)
+  endif()
+
   # On FreeBSD 64 math.h uses unguarded C11 extension, which taints clang
   # 3.4.1 used there.
   if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
-- 
cgit