[clang] [clang][lex] Fix non-portability diagnostics with absolute path (PR #74782)

[Jan Svoboda via cfe-commits]

jansvoboda11 wrote:

> Thanks for reporting @jrmwng, I'll look into it.

I wasn't able to reproduce locally on Windows 10. Can you please share detailed reproduction steps and any other config that may be relevant? It seems your realpath to the LLVM repo is `"C:\GitHub\llvm-project"` and the `check-all` target is built using `"c:\github\llvm-project"`. This works on my machine, so something else must be at play.

https://github.com/llvm/llvm-project/pull/74782