[PATCH] D76653: [clang] Allow -DDEFAULT_SYSROOT to be a relative path

[Sam Clegg via Phabricator via cfe-commits]

sbc100 added a comment.

I have no idea how to write a test for this, but I tested it locally with wasi SDK.

Hopefully fucia will find this useful too as a generic version of https://reviews.llvm.org/D42019


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D76653/new/

https://reviews.llvm.org/D76653