C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C4124
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     Compiler warning (level 1) C4124
 
     __fastcall with stack checking is inefficient
 
     The __fastcall keyword was used when stack checking was enabled.
 
     The __fastcall calling convention is used for generating faster
     code, but stack checking causes slower code to be generated.
     Use the /Gs option or the check_stack pragma to turn off stack
     checking when using __fastcall.
 
     This warning is informational and is issued only for the first
     function declared under these conditions.
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