Re: CVS commit: src/gnu/dist/gcc4/libcpp

2012-11-25 Thread Alan Barrett 

On Sun, 25 Nov 2012, Iain Hibbert wrote:

Log Message:
Teach gcc4.1's cpp about the magic __COUNTER__ macro,
which returns a unique integer each time it is expanded.
This code was written without reference to any other
implementation of the same feature.


out of interest, what code uses this?


__COUNTER__ is used by the definition of __CTASSERT in .
If __COUNTER__ is not available, it falls back to using __LINE__,
but that's not necessarily unique.

--apb (Alan Barrett)

Re: CVS commit: src/gnu/dist/gcc4/libcpp

2012-11-25 Thread Iain Hibbert 
On Sat, 24 Nov 2012, Alan Barrett wrote:

> Module Name:  src
> Committed By: apb
> Date: Sat Nov 24 09:07:44 UTC 2012
>
> Modified Files:
>   src/gnu/dist/gcc4/libcpp: init.c macro.c
>   src/gnu/dist/gcc4/libcpp/include: cpplib.h
>
> Log Message:
> Teach gcc4.1's cpp about the magic __COUNTER__ macro,
> which returns a unique integer each time it is expanded.
> This code was written without reference to any other
> implementation of the same feature.

out of interest, what code uses this?

regards,
iain