[cfe-dev] Pushable #pragma diagnostics

Chris Lattner clattner at apple.com
Tue Jul 7 14:08:20 PDT 2009

On Jul 5, 2009, at 2:42 PM, Louis Gerbarg wrote:

> I generally compile code with as many warnings enabled as I can, and  
> -Werror. Clang is great for that since it has a lot more flexible  
> options for handling warnings than gcc. It also adopted gcc's recent  
> diagnostic pragmas, which allow one to embed the warning controls  
> directly around the relevant code.

Cool, thanks for working on this.

> It is unclear what the correct behavior of the pop should be at that  
> point. Should pop all the way back to the push, should it attempt to  
> regenerate a diagnostic state without the push put with the warning  
> "-Wall" ? We could choose something, but it seems to me like it is  
> not worth it. Another option to make push and pop explicit it  
> commands:
> #pragma clang diagnostic push
> #pragma clang diagnostic ignored "-Wmultichar"
> char d = 'df'; // no warning.
> #pragma clang diagnostic pop

I strongly prefer this approach.  I'll take a look at your latest  
patch, thanks for working on this Louis!


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