weimingz added a comment.

In http://reviews.llvm.org/D17741#364954, @thakis wrote:

> In http://reviews.llvm.org/D17741#364931, @weimingz wrote:
>
> > 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" ?
>
>
> Yes, something like that. Maybe it could look like 
> `-f__file__-expansion=basename` (to make __FILE__ expand to just the 
> basename, what you want), `-f__file__-expansion=relative-to:/a/b/c` to make 
> it relative to a given path.


I think we can do this separately. A "basename" macro is easier for programmers 
to use and no build system change needed.


http://reviews.llvm.org/D17741



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