Always enable -Wvla

It's only the -Werror part we want to be conditional on being debug
builds.

CMakeLists.txt

@@ -73,12 +73,12 @@ ENDIF()
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99")
 
 # Tell the compiler to be stringent
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wformat=2")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wformat=2")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wformat=2 -Wvla")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wformat=2 -Wvla")
 # Make sure we catch these issues whilst developing
 IF(CMAKE_BUILD_TYPE MATCHES Debug)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror -Werror=vla")
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror -Werror=vla")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
 ENDIF()
 # clang doesn't support format_arg, which breaks this warning
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")