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main.f90

program main 
        use func_m
        implicit none 
        real(fp):: a(5)
        call sub(a) 
        write(*,*) a
end program main 

module func_m
        implicit none 
#ifdef DOUBLE_PRECISION
        integer,parameter :: fp = kind(1.0d0)
#else 
        integer,parameter :: fp = kind(1.0)
#endif

        contains 

subroutine sub(a)
        real(fp):: a(:)
        a = 10.0_fp 
end subroutine 
end module 

#!/usr/bin/bash 
SRC = fun.f90 
SRC:= $(SRC) main.f90 
OBJ = $(SRC:.f90=.o)
FC  = gfortran 
FF  = -cpp -O0 -g -fbacktrace 
DF  = -DDOUBLE_PRECISION 
EXE = myPro

ALL : $(OBJ) 
        $(FC) $(FF) $(DF) -o $(EXE)  $(OBJ) 
        
$(OBJ):%.o:%.f90 
        $(FC) $(FF) $(DF) -c $< -o $@
        
.PONHY: clean
clean :        
        rm -rf *.mod *.o $(EXE)