[LLVMdev] DCE and external function

[leledumbo]

> No of course not. Nobody ever checks the return value of printf, for
> example. :)
> 
> The only special case is if you name your function something that exists
> in the C standard library; if you name your function "malloc" we're
> going to remove calls to it with unused results.

OK, sounds I'm on the right way :)

> At the level of the original C source you can do this using gcc's "pure"
> and
> "const" attributes.  At the level of LLVM IR, you can use the "readonly"
> and
> "readnone" attributes.

This makes things clearer.

Thanks to all.

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