[clang] [llvm] [driver] Make --version show if assertions, etc. are enabled (PR #87585)

[Cassie Jones via cfe-commits]

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@@ -2002,6 +2002,44 @@ void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
   // Print out the install directory.
   OS << "InstalledDir: " << Dir << '\n';
 
+  // Print out build configuration options that impact the compiler's runtime
+  // behavior. Intended for identifying the source of issues when reproducing
+  // changes.
+  std::vector<std::string> BuildOptions = {
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porglezomp wrote:

I moved this to a global variable to support the API, so I think `ArrayRef<StringRef>` ends up being the appropriate type in the end.

https://github.com/llvm/llvm-project/pull/87585