cmake: Manage building with clang-9

Author: jfsmig

CMakeLists.txt

@@ -32,44 +32,59 @@ endif ()
 set(CMAKE_C_FLAGS "-g -Wall -Wextra -Wunused -pipe -std=gnu99")
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
 
-if (CMAKE_COMPILER_IS_GNUCC)
+if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-variadic-macros")
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wsequence-point")
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wredundant-decls")
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wshadow")
-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wtrampolines")
 
 	# gcc >= 4.2
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wcomment")
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmain")
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wparentheses")
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wfloat-equal")
-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunsafe-loop-optimizations")
-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-but-set-parameter")
-	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-but-set-variable")
 
 	# gcc >= 4.6
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-prototypes")
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-missing-field-initializers")
 	#set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Winline")
 	#set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wconversion")
 	#set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wswitch-enum")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-const-variable")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-parameter")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-variable")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-macros")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-value")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-function")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-result")
+
+	if (CMAKE_COMPILER_IS_GNUCC)
+		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wtrampolines")
+		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunsafe-loop-optimizations")
+		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-but-set-parameter")
+		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused-but-set-variable")
+	endif()
 else()
 	message("The default compiler set in CC is not supported.")
-	message("You need to use gcc with a version >= 4.2. ")
+	message("You need to use gcc (with a version >= 4.2) or Clang (version >= 9)")
 	message("You can set your default compiler either by updating your CC variable environment:")
 	message("export CC=/path/to/gcc")
+	message("export CC=/path/to/clang-9")
 	message("Or by adding a flag when calling CMake: ")
 	message("-D CMAKE_C_COMPILER=gcc")
+	message("-D CMAKE_C_COMPILER=clang-9")
 	message( FATAL_ERROR "CMake will exit.")
 endif()
+
+
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SAN_CFLAGS}")
 
 if (CMAKE_BUILD_TYPE STREQUAL "Debug" OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
 MESSAGE("DEBUG symbols enabled")
 endif()
 
-set(CMAKE_C_FLAGS_DEBUG          "-O0 -fno-inline")
+set(CMAKE_C_FLAGS_DEBUG          "-Og -fno-inline")
 set(CMAKE_C_FLAGS_RELEASE        "-O2")
 set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O2")
 set(CMAKE_C_FLAGS_MINSIZEREL     "-Os")