keith added inline comments.

================
Comment at: llvm/utils/lit/lit/TestRunner.py:1124
+    if kIsWindows:
+        fs_root = 'C:\\'
+    substitutions.extend([
----------------
probinson wrote:
> rnk wrote:
> > It is pretty common to run the LLVM test suite on secondary drives, 
> > especially on buildbot VMs, to separate build disk usage from the root 
> > partition. Can we have two separators, `${srcroot}` and `${tmproot}` that 
> > expand to the drive letter of the source and temp path base? That seems 
> > like it would be general and implementable.
> +1.  I don't even do builds on C: drive, on one of my machines.
Updated, I kept the `fs` prefixing thinking that `srcroot` and `tmproot` might 
be too confusable as an alternative to `%t` and friends, let me know what you 
think!


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D111457/new/

https://reviews.llvm.org/D111457

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