USB_ATTACH_SETUP macros question

[Tofig Suleymanov]

>
>>
>> Made a little test which shows that this code is going to be executed
>> only
>> once.How did i miss that :) Now the other question comes next:
>> Why don not we use just:
>> #define USB_ATTACH_SETUP \
>> sc->sc_dev = self; \
>> device_set_desc_copy(self, devinfo); \
>> device_printf(self, "%s\n", devinfo);
>
> Because that is dangerous.
>
> Consider the following:
>
> if (1) USB_ATTACH_SETUP;
>
> What is the meaning of the statement above?
>
> What is going to get executed?
>
> --HPS
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>

Thank you for usefull example.
Now it is clear to me.

Thank you,
Tofig Suleymanov