[clang] [llvm] [CodeView] Flatten cmd args in frontend for LF_BUILDINFO (PR #106369)

[Alexandre Ganea via cfe-commits]

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@@ -321,6 +322,41 @@ static bool actionRequiresCodeGen(BackendAction Action) {
          Action != Backend_EmitLL;
 }
 
+static std::string flattenClangCommandLine(ArrayRef<std::string> Args,
+                                      StringRef MainFilename) {
+  std::string FlatCmdLine;
+  raw_string_ostream OS(FlatCmdLine);
+  bool PrintedOneArg = false;
+  if (!StringRef(Args[0]).contains("-cc1")) {
+    llvm::sys::printArg(OS, "-cc1", /*Quote=*/true);
+    PrintedOneArg = true;
+  }
+  for (unsigned i = 0; i < Args.size(); i++) {
+    StringRef Arg = Args[i];
+    if (Arg.empty()) {
+      continue;
+    }
+    if (Arg == "-main-file-name" || Arg == "-o") {
+      i++; // Skip this argument and next one.
+      continue;
+    }
+    if (Arg.starts_with("-object-file-name") || Arg == MainFilename) {
+      continue;
+    }
+    // Skip fmessage-length for reproduciability.
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aganea wrote:

This should read "reproducibility"

https://github.com/llvm/llvm-project/pull/106369