BUG: F1001 on a Structure Declaration with Arrays

• Microsoft FORTRAN PowerStation for MS-DOS, versions 1.0 and 1.0a
• Microsoft FORTRAN PowerStation 32 for Windows NT, version 1.0

SYMPTOMS

Using the /Zi option to compile a program that has a structure declaration containing medium-sized arrays can generate the following error message when running on the FORTRAN PowerStation for MS-DOS, version 1.0a, or the FORTRAN PowerStation 32 for Windows NT, version 1.0:

   fatal error F1001: INTERNAL COMPILER ERROR
       (compiler file '@(#)p2symtab.c:1.89', line 1601)

   fatal error F1001: INTERNAL COMPILER ERROR
       (compiler file '@(#)p2symtab.c:1.89', line 1390)

CAUSE

This problem is caused by using the /Zi option when compiling some code that contains structures. Whether the problem occurs depends on the size of the elements of the structure, the order of the elements, and the names of the elements.

RESOLUTION

The error is dependent on the /Zi option and the size, order, and names of the array elements. Therefore, there are two possible resolutions:

• Do not use the /Zi option.

  -or-

• Rearrange the order of the elements in the structure: putting the largest elements last often seems to prevent the F1001 error.

STATUS

Microsoft has confirmed this to be a bug in the FORTRAN PowerStation for MS- DOS, versions 1.0 and 1.0a, and the FORTRAN PowerStation 32 for Windows NT, version 1.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

To demonstrate the problem, compile the following sample code. To suppress the internal compiler error, do any one of the following:

• Do not use /Zi.

  -or-

• Change the name of the variable GV to just G.

  -or-

• Reduce the size of the arrays.

  -or-

• Move the line "real*8 gv(1)" before "real*8 a(8,513)".

Sample Code

c compile options needed: /Zi

   structure /struct/
      real*8 a(8,513)
      real*8 gv(1)
   end structure
   record /struct/ s
   end