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C/C++ COMPILER->Compiler command line options->Use __fastcall Calling Conventions (/Gr)

The /Gr option tells the compiler to use the __fastcall calling convention.

Any function not declared with the __cdecl or __stdcall qualifier will be compiled with the __fastcall calling convention.

Function prototyping is required when this option is used.

All standard C library functions are qualified with the __cdecl qualifier and so this option will not affect calls to the standard library.