Add default compiler flags for Cray (#50)

Co-authored-by: Ioan Hadade <ioan.hadade@ecmwf.int>

Author: awnawab

cmake/ecwam_compile_flags.cmake

@@ -16,6 +16,9 @@ if(CMAKE_Fortran_COMPILER_ID MATCHES "Cray")
   set(checkbounds_flags   "-Rb")
   set(fpe_flags           "-Ktrap=fp")
   set(initsnan_flags      "-ei")
+  set(threading_flags     "-Othread1")
+  set(fpmodel_flags       "-hfp1 -hflex_mp=conservative -hadd_paren")
+  set(baseline_flags      "-ram -emf")
 
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "GNU")
   set(autopromote_flags   "-fdefault-real-8 -fdefault-double-8")
@@ -68,6 +71,12 @@ endif()
 if( DEFINED heap_arrays_flags )
   ecbuild_add_fortran_flags( "${heap_arrays_flags}"   NAME heap_arrays )
 endif()
+if( DEFINED baseline_flags)
+  ecbuild_add_fortran_flags( "${baseline_flags}"   NAME baseline_flags )
+endif()
+if( DEFINED threading_flags)
+  ecbuild_add_fortran_flags( "${threading_flags}"   NAME threading_flags )
+endif()
 
 if( CMAKE_BUILD_TYPE MATCHES "Debug" )
   foreach( debug_flag    fpe initsnan checkbounds )