hans added inline comments.

================
Comment at: clang/lib/Driver/ToolChains/Clang.cpp:583
+  llvm::sys::path::Style Style =
+      llvm::sys::path::is_absolute(ObjFileNameForDebug)
+          ? llvm::sys::path::Style::native
----------------
zequanwu wrote:
> hans wrote:
> > Won't the code above (line 580) make many filenames absolute and cause us 
> > to use native slashes even when we want backslashes?
> > 
> > This would also need a test.
> > Won't the code above (line 580) make many filenames absolute and cause us 
> > to use native slashes even when we want backslashes?
> Yes, I don't think we should change anything if it's converted to an absolute 
> path.
> 
> Only if the `-fdebug-compilation-dir` is not given or is an absolute path, 
> the path in `/Fo` will be converted to absolute path. Users can avoid the 
> path being converted to absolute path by passing a relative path to 
> `-fdebug-compilation-dir`, just like what we do in chrome build 
> (`-fdebug-compilation-dir=.`).
> 
> Added a test.
Apologies for all the questions, but I find the logic a bit complex still. The 
test cases are helpful though.

Could we simplify by just always using Windows slashes here, regardless of 
`-fdebug-compilation-dir` etc.?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D147256/new/

https://reviews.llvm.org/D147256

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