KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q67358: C1001: Internal Compiler Error: regMD.c, Line 4688

Article: Q67358
Product(s): See article
Version(s): 6.00 6.00a | 6.00 6.00a
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | buglist6.00 buglist6.00a | mspl13_c
Last Modified: 4-DEC-1990

The sample code below produces the following internal compiler errors
under different versions of the compiler. These problems occur when
any of the following individual optimizations are used under the small
and medium memory models:

   /Oa /Oc /Oi /On /Op /Or /Os /Ot /Ow /Oz

Under C 6.00a
-------------

   test.c(7) : fatal error C1001: Internal Compiler Error
                   (compiler file '@(#)regMD.c:1.110', line 4688)
                   Contact Microsoft Product Support Services

Under C 6.00
------------

   test.c(7) : fatal error C1001: Internal Compiler Error
                   (compiler file '@(#)regMD.c:1.100', line 4634)
                   Contact Microsoft Product Support Services

The following are four possible workarounds:

1. Add one of the following optimizations:

      /Od /Oe /Og /Ol /Ox

2. Do not declare the structure variables of type register.

3. Use an if-else statement instead of the ternary operator.

4. Compile under the compact or large memory models.

Sample Code
-----------

1:  void main(void)
2:  {
3:     register int *boo, *hoo;
4:     int n;
5:
6:     boo=hoo;
7:     n= *boo ? 1 / *boo : 1;
8:  }

Microsoft has confirmed this to be a problem in C versions 6.00 and
6.00a. We are researching this problem and will post new information
here as it becomes available.

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.