[clang] [clang-tools-extra] [llvm] [clang-format] Add support for BasedOnStyle referencing an arbitrary file (PR #107312)

[Ryan Saunders via cfe-commits]

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@@ -5274,9 +5274,17 @@ struct FormatStyle {
 
   friend std::error_code
   parseConfiguration(llvm::MemoryBufferRef Config, FormatStyle *Style,
+                     const std::vector<std::string> &StyleSearchPaths,
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jediry wrote:

Yes, I can certainly do that if that is preferred. And, if I'm to do this as multiple PRs as several have requested, then a default param (or an overload) is needed. FWIW, though, I did this intentionally, to flush out all callers of lib/format: once this feature is in and used by actual users, this needs to be pushed through all the tools that leverage lib/format, or else those tools will choke on peoples' valid .clang-format files.

https://github.com/llvm/llvm-project/pull/107312