Re: [boost] Official warnings policy?

Subject: Re: [boost] Official warnings policy?
From: Jeffrey Bosboom (jbosboom_at_[hidden])
Date: 2009-11-11 04:54:41

Juergen Hunold wrote:
> With modern gcc (read: 4.3 and higher), you can use the following:
> 
> -----------snip--------- 
>  #if defined(__GNUC__)
>     #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
> #endif
>  
> void foo(int bar
> {
> }
> 
> +#if defined(__GNUC__)
> +    #pragma GCC diagnostic warning "-Wdeprecated-declarations"
> +#endif
> --------------------------------------------------------

The GCC docs say: "Also, while it is syntactically valid to put these 
pragmas anywhere in your sources, the only supported location for them 
is before any data or functions are defined. Doing otherwise may result 
in unpredictable results depending on how the optimizer manages your 
sources."

This might only mean you can't use them inside functions or class 
definitions, but it seems to imply that using them after a function 
definition leads to undefined behavior.  Thus, even if we knew what 
setting to turn the warning back to (perhaps the warning wasn't enabled 
in the first place!), we might not be able to turn them back on.

--Jeffrey Bosboom