Build: Set _BUILD_DIRECTIVE even if the compiler is not properly detected

cmake/platform/unix/settings.cmake

@@ -32,10 +32,13 @@ add_custom_target(uninstall
 )
 message(STATUS "UNIX: Created uninstall target")
 
+message(STATUS "UNIX: Detected compiler: ${CMAKE_C_COMPILER}")
 if(CMAKE_C_COMPILER MATCHES "gcc")
   include(${CMAKE_SOURCE_DIR}/cmake/compiler/gcc/settings.cmake)
 elseif(CMAKE_C_COMPILER MATCHES "icc")
   include(${CMAKE_SOURCE_DIR}/cmake/compiler/icc/settings.cmake)
 elseif(CMAKE_C_COMPILER MATCHES "clang")
   include(${CMAKE_SOURCE_DIR}/cmake/compiler/clang/settings.cmake)
+else()
+add_definitions(-D_BUILD_DIRECTIVE='"${CMAKE_BUILD_TYPE}"')
 endif()