phosek added inline comments.

================
Comment at: clang/lib/Driver/ToolChains/Fuchsia.cpp:379
+
+    // Second add the generic one.
+    P.assign(Path);
----------------
ldionne wrote:
> Doesn't that break `#include_next` if both directories exist? Generally 
> speaking, I think you only ever want to have a single directory containing 
> the libc++ headers on your header search path.
See my comment, the per-target include path will only contain `__config_site` 
whereas the generic one contains all the headers other than `__config_site` so 
this works fine. It would even work if you had another copy of `__config_site` 
in the generic one which may be useful on platforms that don't currently 
support the multiarch layout like Darwin.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D89013/new/

https://reviews.llvm.org/D89013

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