New check added to Makefile

source/Makefile

@@ -23,7 +23,7 @@
  ifeq ($(FC),gfortran)
    PREPROCESS_KEY = -cpp
    opt_keys = -fopenmp -O3 #-fp-model source
-   check_keys = #-g -ffpe-trap=invalid,zero,overflow -fcheck=all -fbacktrace
+   check_keys = #-g -ffpe-trap=invalid,zero,overflow,denormal -fcheck=all -fbacktrace
  endif
 
  objfiles_path = ../objfiles/