[PATCH] D20993: [lit] Add support for PGO profile and code coverage collection

[Vedant Kumar via llvm-commits]

vsk added a comment.

Some of the discussion moved onto the mailing list and Phab couldn't pick up the comments.

The TL;DR: The plan is to add in-process raw profile merging support to compiler-rt. In fact, David has already added the basic mandatory file-locking constructs we'll need (see r271864). Apart from bringing general usability improvements, this will let us trim this patch down significantly.


http://reviews.llvm.org/D20993