BUG: C 6.0 /G1 Option Puts .286 Specifier in Assembly Listings

The information in this article applies to:

• The C/C++ Compiler (CL.EXE), included with:

      - Microsoft C for MS-DOS and OS/2, version 6.0
      - Microsoft Visual C++ for Windows, versions 1.0, 1.5, and 1.51
  

SYMPTOMS

When using the Microsoft C Compiler version 6.0 or Visual C++ version 1.0 to generate an assembly listing with the /Fa or /Fc option, .286 and .287 processor specifiers are incorrectly inserted when the /G1 option is specified. /G1 should produce .8087 processor code.

This can be seen be compiling the sample code below and viewing the .COD file generated by /Fc (which is also shown below). As a workaround, /G0 may be used instead of /G1.

STATUS

Microsoft has confirmed this to be a bug in the products listed at the beginning of this article. This problem was corrected in C version 6.0a, but reappeared in Visual C++ 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

Sample Code

/* Compile options needed: /G1 /Fc
*/

void main (void)

   int a;

   a = 25;

.COD File Generated

;       Static Name Aliases
;
        TITLE   test.c
        .286p               ; Should be blank line
        .287                ; Should be .8087
INCLUDELIB      SLIBCE
_TEXT   SEGMENT  WORD PUBLIC 'CODE'
_TEXT   ENDS
_DATA   SEGMENT  WORD PUBLIC 'DATA'
_DATA   ENDS