Q46270

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Q46270: Typedef of Function Pointer with _loadds Fails

Article: Q46270
Version(s): 5.10   | 5.10
Operating System: MS-DOS | OS/2
Flags: ENDUSER | SR# G890616-20706
Last Modified: 11-SEP-1989

Question:

I have the following typedef declaration:

typedef  void far _loadds pascal MYFUNC(void);
typedef  MYFUNC  far *PMYFUNC;

The second typedef gives a compiler warning (at -W3 level):

   Warning C4105: 'PMYFUNC' : code modifiers only on function
   or pointer to function

How can I avoid the warning?

Response:

This compiler does not handle this situation properly.

One solution is to use a macro as shown below:

    #define FN_FLP far _loadds pascal

    void FN_FLP myfunc1();

    void (FN_FLP *pmyfunc1)();

This isn't as attractive as a typedef, but it does help.

Another way to work around the problem is to put the definition of the
function in a different source file than the calls, leaving the
_loadds keyword in the function definition but taking it out of the
declarations. Since _loadds does not affect the calling sequence, this
process should not cause additional problems.

Note: Be sure to check your generated code.

Microsoft is researching this problem and will post new information as
it becomes available.