John Lisek wrote in a message to All:

 JL> I want to port some old MSC OS/2 1.3 dll's to 16-bit watcom C. 
 JL> I have stumbled on a limitation in the watcom 10.0 compiler. I 
 JL> am not able to to find any switch which will generate the right 
 JL> prologue/epilogue in exportet functions (load of the right DS). 
 JL> The -zw switch only works for windows programs. Does anyone 
 JL> know it this has been corrected in the newer version of Watcom 
 JL> C. Is there an alternative workaround ??

Microsoft C 6.0 gives you this:

      /Ad   Assumes SS==DS (default for standard memory models).
      /Au   Assumes SS!=DS. DS is reloaded on function entry.
      /Aw   Assumes SS!=DS. DS is not reloaded on function entry.
            Primary use is for DLLs and Microsoft Windows(TM) call-back
            functions.

Watcom C/C++ 10.6 gives you this:

      -zdf            DS floats i.e. not fixed to DGROUP
      -zdp            DS is pegged to DGROUP
      -zu             SS != DGROUP

This translates as:

      /Ad   -zdp
      /Au   -zu -zdp
      /Aw   -zu -zdf
 
-- Mike


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