cmake flags (#862)

Author: sbryngelson

CMakeLists.txt

@@ -135,13 +135,18 @@ if (CMAKE_Fortran_COMPILER_ID STREQUAL "GNU")
     if (CMAKE_BUILD_TYPE STREQUAL "Debug")
         add_compile_options(
             -Wall
+            -Wextra	
+            -Wintrinsic-shadow	
+            -Wunderflow	
+            -Wrealloc-lhs	
+            -Wsurprising	
             -fcheck=all,no-array-temps
             -fbacktrace
             -fimplicit-none
-            #-ffpe-trap=invalid,zero,denormal,overflow
             -fsignaling-nans
             -finit-real=snan
             -finit-integer=-99999999
+            #-ffpe-trap=invalid,zero,denormal,overflow
 	    )
     endif()