[#96] Added warning to MinGW in CMake

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

CMakeLists.txt

@@ -16,6 +16,8 @@ message("-- Compiler: [ " ${CMAKE_CXX_COMPILER_ID} " " ${CMAKE_CXX_COMPILER_VERS
 
 if ((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "9.0.0"))
 	message(FATAL_ERROR "Upgrade your compiler! GCC 9.0+ is required!")
+elseif(MINGW)
+	message(WARNING "MinGW is impressively unstable! So beware it may not compile or crash during runtime!")
 endif()
 
 # setting up different paths