KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q69289: C1001: Internal Compiler Error: exphelp.c, Line 617

Article: Q69289
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: 25-FEB-1991

The Microsoft C Compiler versions 6.00 and 6.00a produce the following
internal compiler error when the sample program below is compiled with
default optimization and large memory model (/AL):

   mem2.c(4) : fatal error C1001: Internal Compiler Error
               (compiler file '@(#)exphelp.c:1.117', line 617)
               Contact Microsoft Product Support Services

The above error occurs only when using any one of the optimizations
/Oi, /Oa, /Oc, /On, /Op, /Or, /Os, /Ot, /Ow, /Oz, or using default
optimizations. Furthermore, the source must be compiled in compact,
large, or huge memory models.

To work around the problem, compile without using default
optimizations or any of the above mentioned options. You may elect to
disable optimizations for the function that is producing the error. Do
this by using the "optimize" pragma. Another valid workaround is to
compile using the /qc (Quick Compile) option, which also does not
produce the error.

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

/* Compile with /AL */

void func(int *memoryPtr,unsigned long pageLow)
{
    if ((*memoryPtr)>0)
      pageLow=(unsigned long)memoryPtr>>28;
}

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.