From 0059335c5b60c5623a894f08a090fdabd618afae Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Tue, 11 Sep 2018 17:14:19 -0700 Subject: [PATCH] CMakeList: Check that compiler supports -Wimplicit-fallthrough This is a GCC >= 7 feature, not all compilers support it. Fixes: 908a9f4f1027 ("CMakeLists.txt: add -Wimplicit-fallthrough to the compiler flags") Signed-off-by: Florian Fainelli --- CMakeLists.txt | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/CMakeLists.txt b/CMakeLists.txt index 50f62bd..d6203aa 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -1,7 +1,17 @@ cmake_minimum_required(VERSION 2.6) PROJECT(netifd C) -ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -Wmissing-declarations -Wno-unknown-warning-option -Wno-format-truncation -Wimplicit-fallthrough) + +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 "") -- 2.25.1