Commits on Sep 27, 2018

1. rustc: Tweak filenames encoded into metadata …

   This commit is a fix for rust-lang#54408 where on nightly right now whenever
   generics are inlined the path name listed for the inlined function's
   debuginfo is a relative path to the cwd, which surely doesn't exist!
   Previously on beta/stable the debuginfo mentioned an absolute path which
   still didn't exist, but more predictably didn't exist.
   
   The change between stable/nightly is that nightly is now compiled with
   `--remap-path-prefix` to give a deterministic prefix to all
   rustc-generated paths in debuginfo. By using `--remap-path-prefix` the
   previous logic would recognize that the cwd was remapped, causing the
   original relative path name of the standard library to get emitted. If
   `--remap-path-prefix` *wasn't* passed in then the logic would create an
   absolute path name and then create a new source file entry.
   
   The fix in this commit is to apply the "recreate the source file entry
   with an absolute path" logic a bit more aggresively. If the source
   file's name was remapped then we don't touch it, but otherwise we always
   take the working dir (which may have been remapped) and then join it to
   the file to ensure that we process all relative file names as well.
   
   The end result is that the standard library should have an absolute path
   for all file names in debuginfo (using our `--remap-path-prefix`
   argument) as it does on stable after this patch.
   
   Closes rust-lang#54408

   

   alexcrichton committed Sep 27, 2018
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