Change in preprocessor behavior

[Neil Booth]

Stephen Lindholm wrote:-

> thrush:~% cpp test2
> # 1 "test2"
> 
>       
> struct command commands[] =
> {
>   { #quit, quit ## _command },
>   { #help, help ## _command },
> };

Contrary to your claim, I suspect you're using cpp -traditional, no?

Traditional preprocessors did not support # and ##, and 3.1 is more
"correct" in this respect.  FWIW 3.3 has another new implementation of
traditional preprocessing which is the most faithful of GCC's
implementations to true traditional preprocessing.

Neil.