[PATCH] D25153: preprocessor supports `-dI` flag

[Steve O'Brien via cfe-commits]

elsteveogrande added a comment.

ping :)  Wanted to get sign off on this (simplified) diff if possible.

Thanks!  Sorry to nag.  (This would be one part of the solution for really long build times for us.)


https://reviews.llvm.org/D25153