phosek added inline comments.

================
Comment at: clang/lib/Driver/Driver.cpp:143
 
+  if (llvm::sys::path::is_relative(SysRoot)) {
+    // Prepend InstalledDir if SysRoot is relative
----------------
Does this return `true` or `false` when sysroot is empty?


================
Comment at: clang/lib/Driver/Driver.cpp:145
+    // Prepend InstalledDir if SysRoot is relative
+    SmallString<128> fullpath(InstalledDir);
+    llvm::sys::path::append(fullpath, SysRoot);
----------------
Nit: according to LLVM conventions, this should `FullPath` (or just `P` which 
is also very common temporary path variables).


Repository:
  rG LLVM Github Monorepo

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

https://reviews.llvm.org/D76653



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