weimingz added a comment.

In http://reviews.llvm.org/D17741#364756, @thakis wrote:

> Instead of doing this, would it make sense to have a flag like 
> -ffile-basename that changes what __FILE__ expands to?
>
> I had wished I'd be able to have some control over __FILE__ (I'd like to say 
> "make all __FILE__s relative to this given directory for my use case), and 
> changing __FILE__ to something else in all the world's code isn't easy – so 
> maybe having a flag that provides some control over __FILE__ instead of 
> adding a separate macro would be a good idea.


do you mean this?
if source file is /a/b/c/d/foo.c and if  -ffile-name-stem-remove=/a/b/c, then 
_FILE_ will be expanded to "d/foo.c" ?


http://reviews.llvm.org/D17741



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