[cfe-dev] Disable #error?

Jacob Carlborg doob at me.com
Wed Jan 15 00:09:53 PST 2014

On 2014-01-14 23:25, Sean Silva wrote:

> I don't think anyone would be against adding a callback to PPCallbacks
> to indicate what the error message is so you can get the data. However,
> being able to affect the outcome of compilation from a PPCallbacks
> callback seems unwise; it would be kind of like if the #if callback
> could decide which branch to take, which means explicitly violating the
> source code's meaning, which a compiler shouldn't be doing!

I think I actually need that as well :). I would like to be able to 
translate code like this:

#if Windows
     typedef int foo;
     typedef long foo;


version (Windows)
     alias foo = int;
     alias foo = long;

Preferably I would like to do that without having to run the tool on 
different platforms and somehow merge the results.

I know it technically violates the meaning of the source code. I'm just 
trying to automate what a developer would do manually anyway. Doing it 
manually just increases the risk of making mistakes.

/Jacob Carlborg

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