[Minor] Require cmake 3.0 and modernize somehow

CMakeLists.txt

@@ -5,7 +5,7 @@
 #
 
 ############################# INITIAL SECTION #############################################
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.0 FATAL_ERROR)
 
 PROJECT(rspamd C)
 ENABLE_LANGUAGE(ASM)
@@ -711,66 +711,58 @@ IF(NOT "${CMAKE_C_COMPILER_ID}" MATCHES SunPro)
 	CHECK_C_COMPILER_FLAG("-std=c99" SUPPORT_STD99_FLAG)
 ENDIF(NOT "${CMAKE_C_COMPILER_ID}" MATCHES SunPro)
 IF(SUPPORT_W)
-	ADD_DEFINITIONS("-W")
+	ADD_COMPILE_OPTIONS("-W")
 ENDIF(SUPPORT_W)
 IF(SUPPORT_WALL)
-	ADD_DEFINITIONS("-Wall")
+	ADD_COMPILE_OPTIONS("-Wall")
 ENDIF(SUPPORT_WALL)
 IF(SUPPORT_WPOINTER)
-	ADD_DEFINITIONS("-Wpointer-arith")
+	ADD_COMPILE_OPTIONS("-Wpointer-arith")
 ENDIF(SUPPORT_WPOINTER)
 IF(SUPPORT_WPARAM)
-	ADD_DEFINITIONS("-Wno-unused-parameter")
+	ADD_COMPILE_OPTIONS("-Wno-unused-parameter")
 ENDIF(SUPPORT_WPARAM)
 IF(SUPPORT_WFUNCTION)
-	ADD_DEFINITIONS("-Wno-unused-function")
+	ADD_COMPILE_OPTIONS("-Wno-unused-function")
 ENDIF(SUPPORT_WFUNCTION)
 IF(SUPPORT_WUNUSED_VAR)
-	ADD_DEFINITIONS("-Wunused-variable")
+	ADD_COMPILE_OPTIONS("-Wunused-variable")
 ENDIF(SUPPORT_WUNUSED_VAR)
 IF(SUPPORT_WPOINTER_SIGN)
-	ADD_DEFINITIONS("-Wno-pointer-sign")
+	ADD_COMPILE_OPTIONS("-Wno-pointer-sign")
 ENDIF(SUPPORT_WPOINTER_SIGN)
 IF(SUPPORT_WSTRICT_PROTOTYPES)
-	ADD_DEFINITIONS("-Wstrict-prototypes")
+	ADD_COMPILE_OPTIONS("-Wstrict-prototypes")
 ENDIF(SUPPORT_WSTRICT_PROTOTYPES)
 IF(SUPPORT_WSTRICT_ALIASING)
-	ADD_DEFINITIONS("-Wno-strict-aliasing")
-	ADD_DEFINITIONS("-fno-strict-aliasing")
+	ADD_COMPILE_OPTIONS("-Wno-strict-aliasing")
+	ADD_COMPILE_OPTIONS("-fno-strict-aliasing")
 ENDIF(SUPPORT_WSTRICT_ALIASING)
 #IF(SUPPORT_PEDANTIC_FLAG)
 #	SET(CMAKE_C_WARN_FLAGS "${CMAKE_C_WARN_FLAGS} -pedantic")
 #ENDIF(SUPPORT_PEDANTIC_FLAG)
 IF(SUPPORT_WNULL_DEREFERENCE)
-	ADD_DEFINITIONS("-Wnull-dereference")
+	ADD_COMPILE_OPTIONS("-Wnull-dereference")
 ENDIF()
 IF(SUPPORT_WDUPLICATED_COND)
-	ADD_DEFINITIONS("-Wduplicated-cond")
+	ADD_COMPILE_OPTIONS("-Wduplicated-cond")
 ENDIF()
 IF(SUPPORT_WLOGICAL_OP)
-	ADD_DEFINITIONS("-Wlogical-op")
+	ADD_COMPILE_OPTIONS("-Wlogical-op")
 ENDIF()
 IF(SUPPORT_WNO_UNUSED_CONST)
-	ADD_DEFINITIONS("-Wno-unused-const-variable")
+	ADD_COMPILE_OPTIONS("-Wno-unused-const-variable")
 ENDIF()
 IF(SUPPORT_WSIGN_COMPARE)
-	ADD_DEFINITIONS("-Wno-sign-compare")
+	ADD_COMPILE_OPTIONS("-Wno-sign-compare")
 ENDIF()
-IF(SUPPORT_STD11_FLAG)
-	ADD_DEFINITIONS("-std=c11")
-ELSE(SUPPORT_STD11_FLAG)
-	MESSAGE("C11 compatible compiler is strongly recommended")
-	IF(SUPPORT_STD99_FLAG)
-		ADD_DEFINITIONS("-std=c99")
-	ENDIF(SUPPORT_STD99_FLAG)
-ENDIF(SUPPORT_STD11_FLAG)
 IF(SUPPORT_WIMPLICIT_FALLTHROUGH)
-	ADD_DEFINITIONS("-Wno-implicit-fallthrough")
+	ADD_COMPILE_OPTIONS("-Wno-implicit-fallthrough")
 ENDIF(SUPPORT_WIMPLICIT_FALLTHROUGH)
 
 CHECK_C_COMPILER_FLAG(-fPIC SUPPORT_FPIC)
 IF(SUPPORT_FPIC)
-	ADD_DEFINITIONS("-fPIC")
+	ADD_COMPILE_OPTIONS("-fPIC")
 ENDIF(SUPPORT_FPIC)
 
  # Optimization flags
@@ -1243,7 +1235,6 @@ ADD_SUBDIRECTORY(utils)
 
 
 CONFIGURE_FILE(config.h.in src/config.h)
-ADD_DEFINITIONS("HAVE_CONFIG_H")
 
 ##################### INSTALLATION ##########################################