system-linux: enable by default ignore encaplimit for ip6 tunnels

[oweals/netifd.git] / CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 696412b51f451d110cdbca87c164f066cddf7da3..d6203aac3a8f5e55451a7bf6b0663ea15da44ff3 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,8 +1,18 @@
 cmake_minimum_required(VERSION 2.6)
 
 PROJECT(netifd C)
+
+IF(NOT ${CMAKE_VERSION} LESS 3.0)
+  include(CheckCCompilerFlag)
+  check_c_compiler_flag(-Wimplicit-fallthrough HAS_IMPLICIT_FALLTHROUGH)
+ENDIF()
+
 ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -Wmissing-declarations -Wno-unknown-warning-option -Wno-format-truncation)
 
+IF(HAS_IMPLICIT_FALLTHROUGH)
+  ADD_DEFINITIONS(-Wimplicit-fallthrough)
+ENDIF()
+
 SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
 
 SET(SOURCES