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RE: [avr-libc-dev] [RFC] Conditional poisoning of deprecated items

From: Weddington, Eric
Subject: RE: [avr-libc-dev] [RFC] Conditional poisoning of deprecated items
Date: Mon, 28 Feb 2011 20:01:42 -0700

> -----Original Message-----
> From: John Myers [mailto:address@hidden
> Sent: Monday, February 28, 2011 7:17 PM
> To: Weddington, Eric
> Cc: address@hidden
> Subject: Re: [avr-libc-dev] [RFC] Conditional poisoning of deprecated
> items
> The system header pragma suppresses the warnings.
> #pragma GCC system_header
> #define xyz 3
> #pragma GCC poison xyz

Thanks for finding that, John! Yes, it looks like that could work. It looks 
like it would have some other side-effects, however, the documentation says 
that it only affects the code that comes after that pragmas. So we could 
implement this by putting the poisoning of symbols at the bottom of a header 
file (e.g. at the bottom of an I/O header file, with the pragmas system_header 
just right before the poisoning.

We could then have it default on, with a conditional compilation symbol to turn 
OFF the poisoning of deprecated items.

For example:

// I/O header file

// A bunch of defined stuff...

#pragma GCC system_header
#pragma GCC poison abc
// Poisoned definitions.
#pragma GCC poison xyz

How does that sound?

Joerg, do you have any objections to this implementation?

Eric Weddington

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