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I am using functions, which returns structs. This shouldn't be a problem in C. And it works mostly. But are there contexts where this is not allowed? Maybe there a conflicts because those structs are returned by using registers? for example: typedef struct { unsigned char Byte_1; unsigned char Byte_2; } two_byz; two_byz f_a(void) { two_byz rueck; rueck.Byte_1 = 0xAA; rueck.Byte_2 = 0xBB; return ( rueck); } two_byz test; test = f_a(); Again: this example does work - mostly! But as i used this module in another program there was just no return value. It is really weird, the function then behaves like void f_a(void).
In fact there was no problem with the function or the function calling. In this other modul, which i've mentioned, i had produced a great memory overflow. I admitt this was a really silly mistake. However, I thank you for your trouble and by the way it was useful information.