传递时字符串数组无效

我在传递字符串数组时遇到问题。请考虑以下示例代码:

! -- Module to declare variable
module my_data
   implicit none

   ! -- Declare as deferred-length allocatable array
   character(len=:), dimension(:), allocatable :: str_array
end module my_data

! -- Module to call subroutine
module my_subs
   implicit none

contains
subroutine a(str_array)
   character(len=*), dimension(:), intent(IN) :: str_array
   integer :: i, j
   character :: c

   do i=1,size(str_array)
      do j=1,len_trim(str_array(i))
         c = str_array(i)(j:j)

         ! -- Write i, j, character, and int representation
         write(*,*) 'In call: ', i, j, ' "'//c//'", ichar = ', ichar(c)
      enddo
   enddo
end subroutine a
end module my_subs

! -- Main program
program main
   use my_data, only : str_array
   use my_subs, only : a
   implicit none
   integer, parameter :: strlen = 200
   integer :: N, i, j
   character :: c

   ! -- Size of str array
   N = 2

   ! -- Allocate str_array, syntax from https://software.intel.com/en-us/forums/intel-visual-fortran-compiler-for-windows/topic/287349
   allocate(character(strlen) :: str_array(N))

   ! -- Set both to the same string
   str_array = 'abc'

   do i=1,size(str_array)
      do j=1,len_trim(str_array(i))
         c = str_array(i)(j:j)

         ! -- Write i, j, character, and int representation
         write(*,*) 'In main: ', i, j, ' "'//c//'", ichar = ', ichar(c)
      enddo
   enddo

   call a(str_array)
end program main

字符串数组声明为假定长度元素的数组(从 the wiki )我分配和设置字符串的值(两个元素,均为 abc 对于这个例子)。主例程输出关于字符串的完整细节,然后调用一个子例程,该子例程还输出(希望相同)完整细节。

使用PGI、GCC或Intel 15.0,我得到了预期的结果:

chaud106@ln0005 [~/Testing] % ifort --version && ifort -check all -warn all main.f90 && ./a.out
ifort (IFORT) 15.0.3 20150407
Copyright (C) 1985-2015 Intel Corporation.  All rights reserved.

 In main:            1           1  "a", ichar =           97
 In main:            1           2  "b", ichar =           98
 In main:            1           3  "c", ichar =           99
 In main:            2           1  "a", ichar =           97
 In main:            2           2  "b", ichar =           98
 In main:            2           3  "c", ichar =           99
 In call:            1           1  "a", ichar =           97
 In call:            1           2  "b", ichar =           98
 In call:            1           3  "c", ichar =           99
 In call:            2           1  "a", ichar =           97
 In call:            2           2  "b", ichar =           98
 In call:            2           3  "c", ichar =           99

但是,Intel18.0将字符数组的第二个元素(全部3个字符)设置为空字符:

chaud106@ln0005 [~/Testing] % ifort --version && ifort -check all -warn all main.f90 && ./a.out
ifort (IFORT) 18.0.0 20170811
Copyright (C) 1985-2017 Intel Corporation.  All rights reserved.

 In main:            1           1  "a", ichar =           97
 In main:            1           2  "b", ichar =           98
 In main:            1           3  "c", ichar =           99
 In main:            2           1  "a", ichar =           97
 In main:            2           2  "b", ichar =           98
 In main:            2           3  "c", ichar =           99
 In call:            1           1  "a", ichar =           97
 In call:            1           2  "b", ichar =           98
 In call:            1           3  "c", ichar =           99
 In call:            2           1  "", ichar =            0
 In call:            2           2  "", ichar =            0
 In call:            2           3  "", ichar =            0

我有几个与这种行为相关的问题:

1. 为什么会这样?我原以为这可能与英特尔强制LHS重新分配有关,但我不确定。添加 -assume norealloc_lhs 什么都没变。

2. 传递这样的字符串数组的正确语法是什么?我可以用不同的方式声明它并避免这个问题吗?

在此计算机上我可以访问的Intel版本具有以下行为:

• ifort(ifort)15.0.2 20150121-无无效
• ifort(ifort)15.0.3 20150407-无无效
• ifort(ifort)16.0.3 20160415-无无效
• ifort(ifort)17.0.4 20170411-无效
• ifort(ifort)18.0.0 20170811-无效

在另一台机器上,我没有任何最新的Intel:

• ifort(ifort)14.0.2 20140120-无无效
• ifort(ifort)16.0.0 20150815-无无效