C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
Conflicts Between __fastcall and Windows Entry/Exit Code
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     Windows entry/exit code and the __fastcall calling convention can
     conflict in their use of the ax register. As a result, using the
     following combinations of options and keywords will generate an
     error:
 
        ■ __fastcall, __far, Gw
 
        ■ __fastcall, __far, __export, GA
 
        ■ __fastcall, __far, __export, GD
 
        ■ __fastcall, __far, GA, GEf
 
        ■ __fastcall, __far, GD, GEf
 
        ■ __fastcall, __far, __export, GA, GEf
 
        ■ __fastcall, __far, __export, GD, GEf
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