Q64030: Internal Compiler Error: ‘@(#)newcode.c:1.87’, Line 604

Article: Q64030
Product(s): See article
Version(s): 6.00   | 6.00
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | buglist6.00 | mspl13_c
Last Modified: 25-JUL-1990

If sample code below is compiled in large or compact memory model with
any optimizations except /Od, /Oa, or /Ow, the compiler will fail with
the following error message:

   fatal error C1001: Internal Compiler Error
    (compiler file '@(#)newcode.c:1.87', line 604)
    Contact Microsoft Product Support Services

If the code is compiled with /Oa or /Ow, the following error message
will be generated:

   fatal error C1001: Internal Compiler Error
    (compiler file '@(#)regMD.c:1.100', line 1017)
    Contact Microsoft Product Support Services

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

#include <ctype.h>
#define OFFSET 2
#define NEXTFP(nextfp,fp) \
        nextfp = (long) fp & 0xffff0000;\
        nextfp = nextfp + * fp + *(fp+1) * 0x100;

static unsigned char * stk_bottom;
static long first_fp;

void main (void) {}

void chkstkinit()
{
   unsigned char stk_top;
   static long nextfp;
   static unsigned char *fp;

   stk_top = 0xaa;
   fp = &stk_top + OFFSET;
   NEXTFP(nextfp, fp);
   stk_bottom = (unsigned char *)nextfp;   // Error on This line
   first_fp = *stk_bottom + *(stk_bottom +1) * 0x100;

   return;
}

Since these errors occur if any optimization is turned on, compiling
with the /Od optimization switch or using the new optimize pragma to
turn off all optimizations is the easiest solution.

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

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