─── Output/messages ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
─── Source ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
1187         SuggestedCompletions.push_back(S);
1188   } else {
1189     // If the flag is in the form of "--autocomplete=foo,bar", we were
1190     // requested to print out all option values for "-foo" that start with
1191     // "bar". For example,
1192     // "--autocomplete=-stdlib=,l" is expanded to "libc++" and "libstdc++".
1193     StringRef Option, Arg;
1194     std::tie(Option, Arg) = PassedFlags.split(',');
1195     SuggestedCompletions = Opts->suggestValueCompletions(Option, Arg);
1196   }
1197
1198   // Sort the autocomplete candidates so that shells print them out in a
1199   // deterministic order. We could sort in any way, but we chose
1200   // case-insensitive sorting for consistency with the -help option
1201   // which prints out options in the case-insensitive alphabetical order.
1202   std::sort(SuggestedCompletions.begin(), SuggestedCompletions.end(),
1203             [](StringRef A, StringRef B) { return A.compare_lower(B) < 0; });
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Breakpoint 3, clang::driver::Driver::handleAutocompletions (this=0x7fffffffcfc0, PassedFlags=...) at /opt/clang/llvm/tools/clang/lib/Driver/Driver.cpp:1195
1195        SuggestedCompletions = Opts->suggestValueCompletions(Option, Arg);
>>> p Arg
$12 = {
  static npos = 18446744073709551615,
  Data = 0x7fffffffe4fb "",
  Length = 0
}
>>> p Option
$13 = {
  static npos = 18446744073709551615,
  Data = 0x7fffffffe4f6 "-std,",
  Length = 4
}
>>> p PassedFlags
$14 = {
  static npos = 18446744073709551615,
  Data = 0x7fffffffe4f6 "-std,",
  Length = 5
}
>>>