From b6983da04550079d7f7276aa0bf7a71a1f95d068 Mon Sep 17 00:00:00 2001
From: BtbN <btbn@btbn.de>
Date: Mon, 31 Mar 2014 03:53:50 +0200
Subject: [PATCH] Error on implicit declaration

---
 CMakeLists.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cbe64b9bc..b74239e4b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,9 +31,9 @@ if(${CMAKE_C_COMPILER_ID} MATCHES "Clang" OR ${CMAKE_CXX_COMPILER_ID} MATCHES "C
 endif()
 
 if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANG)
-	set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-unused-function ${CMAKE_CXX_FLAGS}")
-	set(CMAKE_C_FLAGS "-Wall -Wextra -Wno-unused-function -Wno-missing-field-initializers ${CMAKE_C_FLAGS} -std=gnu99")
-	
+	set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-unused-function -Werror-implicit-function-declaration -Wno-missing-field-initializers ${CMAKE_CXX_FLAGS}")
+	set(CMAKE_C_FLAGS "-Wall -Wextra -Wno-unused-function -Werror-implicit-function-declaration ${CMAKE_C_FLAGS} -std=gnu99")
+
 	option(USE_LIBC++ "Use libc++ instead of libstdc++" ${APPLE})
 	if(USE_LIBC++)
 		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
-- 
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