[LLVMdev] debugloc metadata variation

[Sean Silva]

On Wed, Oct 22, 2014 at 4:57 PM, David Blaikie <dblaikie at gmail.com> wrote:

> Just working on some of the gmlt+fission debug info stuff and I came
> across a comment that might be relevant to reducing the number of distinct
> debugloc metadata nodes:
>
> "or some sub-optimal metadata that
>   // isn't structurally identical (see: file path/name info from clang,
> which
>   // includes the directory of the cpp file being built, even when the
> file name
>   // is absolute (such as an <> lookup header)))"
>
> Seems that the file path/name isn't well canonicalized so as to allow
> metadata level merging when linking. Might be helpful to figure out that
> issue at some point.
>

I wonder how much memory is spent on redundant path prefixes. E.g.

/really/really/really/long/path/to/foo.h
/really/really/really/long/path/to/bar.h

-- Sean Silva


>
> - David
>
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