thakis added a comment.

`__FILE__` only expands to an absolute path if you pass an absolute path to 
clang (ctrl-f "__FILE__" on 
http://blog.llvm.org/2019/11/deterministic-builds-with-clang-and-lld.html).

It feels like this is working around a deficiency in the compiler. Maybe fixing 
whatever's going wrong in the compiler might be better? (There's also 
-ffile-file-prefix map, but using that makes your _commandline_ depend on the 
name of the build dir, and (in clang) `__FILE_NAME__ `.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D75890/new/

https://reviews.llvm.org/D75890



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