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Error in my code?

  1. Dec 9, 2015 #1
    I have received this error :
    Code (Fortran):

    Undefined symbols for architecture x86_64:
    "start", referenced from:

    -u command line option

    (maybe you meant: __gfortrani_library_start)

    ld: symbol(s) not found for architecture x86_64

    collect2: error: ld returned 1 exit status
    what is this mean??

    the code is :
    Code (Fortran):

    program   exercise2

      integer:: i,j
      real,dimension (5,5)::A


      do i=1,5
      end do

      do i=1,5
      end do


      end program exercise2
    Last edited by a moderator: Dec 9, 2015
  2. jcsd
  3. Dec 9, 2015 #2


    Staff: Mentor

    WHat command are you using to run the code?
  4. Dec 9, 2015 #3
    I am using gfortran in macbook air version 10.9.5
  5. Dec 9, 2015 #4


    User Avatar

    Staff: Mentor

    Could you show exactly the compiling command? The problem might be with your installation of gcc.
  6. Dec 9, 2015 #5
    sigmat-no-air:desktop amany$gfortran exercise2.f90
  7. Dec 9, 2015 #6


    User Avatar

    Staff: Mentor

    Then gfortran is not installed properly.
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