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Q67779: C1001: Internal Compiler Error: regMD.c, Lines 3047 and 3020

Article: Q67779
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: 31-JAN-1991

The sample code below produces the following internal compiler errors
when compiled under different versions of the C compiler. The problem
occurs when compiled with the /Og and /Oe optimizations under the
compact and large memory models.

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

   file.c(11) : fatal error C1001: Internal Compiler Error
                      (compiler file '@(#)regMD.c:1.110', line 3047)
                      Contact Microsoft Product Support Services

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

   file.c(11) : fatal error C1001: Internal Compiler Error
                      (compiler file '@(#)regMD.c:1.110', line 3020)
                      Contact Microsoft Product Support Services

The following are valid workarounds for the problem:

1. Compile without the /Oe or /Og optimizations.

2. Use the #pragma optimize switch in the code to turn off the
   offending optimizations for the particular function.

3. Compile under the small or medium memory models.

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

#include<string.h>

void foo (void)
{
    char *o, *wp, *cp;
    int c,t;

    for (;;)
    {
        wp++;
        t = wp - cp;
        if (c) t=0;
        if (t) strncpy (&o[c], cp, t );
        c = t;
        cp = wp;
    }
}

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