check_modules_for_duplicates Subroutine

subroutine check_modules_for_duplicates(model, duplicates_found)
    type(fpm_model_t), intent(in) :: model
    integer :: maxsize
    integer :: i,j,k,l,m,modi
    type(string_t), allocatable :: modules(:)
    logical :: duplicates_found
    ! Initialise the size of array
    maxsize = 0
    ! Get number of modules provided by each source file of every package
    do i=1,size(model%packages)
      do j=1,size(model%packages(i)%sources)
        if (allocated(model%packages(i)%sources(j)%modules_provided)) then
          maxsize = maxsize + size(model%packages(i)%sources(j)%modules_provided)
        end if
      end do
    end do
    ! Allocate array to contain distinct names of modules
    allocate(modules(maxsize))

    ! Initialise index to point at start of the newly allocated array
    modi = 1

    ! Loop through modules provided by each source file of every package
    ! Add it to the array if it is not already there
    ! Otherwise print out warning about duplicates
    do k=1,size(model%packages)
      do l=1,size(model%packages(k)%sources)
        if (allocated(model%packages(k)%sources(l)%modules_provided)) then
          do m=1,size(model%packages(k)%sources(l)%modules_provided)
            if (model%packages(k)%sources(l)%modules_provided(m)%s.in.modules(:modi-1)) then
              write(stderr, *) "Warning: Module ",model%packages(k)%sources(l)%modules_provided(m)%s, &
                " in ",model%packages(k)%sources(l)%file_name," is a duplicate"
              duplicates_found = .true.
            else
              modules(modi) = model%packages(k)%sources(l)%modules_provided(m)
              modi = modi + 1
            end if
          end do
        end if
      end do
    end do
end subroutine check_modules_for_duplicates