calling convention in c [closed]

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some one please tell me how to change the default calling convention in c?

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Calling conventions are not specified by the language. They are extensions to your compiler.

That said, commonly you do something like:

void __fastcall my_func(void);

But this is completely dependent on your compiler and platform.

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This largely depends on your compiler, toolchain, and platform. You will need to be more specific on what your environment is, and what you wish to change to.