gcc error: warning: pasting "syn" and ")" does not give a valid preprocessing token

[Neil Booth]

Kiet Tran wrote:-

> #define TCP_EXTERN(state) \
> extern pspec_t *##state##_rcv_rst(tcb_t *,pspec_t *), \
> ....
> 
> I removed the leading '##' pair and found that the
> passing parameter of the macro was not replacing
> 'state' word. The preprocessor replaced the 'state'
> parameter after I insert a space between the '*' character
> and 'state##' word. Is this a real bug in the preprocessor?

Please provide a complete example.

Neil.