dexonsmith added inline comments.

================
Comment at: clang/include/clang/Driver/Options.td:593-594
 
+def round_trip_args : Flag<["-"], "round-trip-args">, Flags<[CC1Option, 
NoDriverOption]>,
+  HelpText<"Performs 'parse-generate-parse' round-trip of command line 
arguments.">;
+def round_trip_args_debug : Flag<["-"], "round-trip-args-debug">, 
Flags<[CC1Option, NoDriverOption]>,
----------------
Can we make this `=true` vs. `=false`, or add a `-no-round-trip-args`? That 
will allow:
```
% clang some args -Xclang -no-round-trip-args
```
to disable it in asserts builds; much better than:
```
% clang some args -###
# Search for -round-trip-args
% clang -cc1 copy-paste-args-before copy-past-args-after
```


================
Comment at: clang/lib/Frontend/CompilerInvocation.cpp:531
+  Option Opt = getDriverOptTable().getOption(OptSpecifier);
+  denormalizeSimpleFlag(Args, SA(Opt.getPrefix() + Opt.getName()), SA,
+                        Option::OptionClass::FlagClass, 0);
----------------
Hmm, I thought we'd found a way to avoid allocating the prefixed name, by 
adding it to the options table. This unfortunate, but I guess you can fix it 
another time.




================
Comment at: clang/lib/Frontend/CompilerInvocation.cpp:540
+  Option Opt = getDriverOptTable().getOption(OptSpecifier);
+  denormalizeString(Args, SA(Opt.getPrefix() + Opt.getName()), SA,
+                    Opt.getKind(), 0, Value);
----------------
Does this allocated string get used, or does `"=some-value"` get added on?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D94472/new/

https://reviews.llvm.org/D94472

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