benlangmuir added inline comments.

================
Comment at: clang/include/clang/Lex/DependencyDirectivesScanner.h:131
+/// \p dependency_directives_scan::tokens_present_before_eof, otherwise this
+/// directive will be ignored.
 ///
----------------
benlangmuir wrote:
> akyrtzi wrote:
> > benlangmuir wrote:
> > > Why would you want to print without this? It seems important for 
> > > correctness of the output.  I would have expected we would always print 
> > > it.
> > The `-print-dependency-directives-minimized-source` clang option is using 
> > this function, and if you print the sources with "<TokBEOF>" at the end 
> > then the source text will not be parsable.
> > 
> > But the tests that pass `-print-dependency-directives-minimized-source` 
> > don't try to parse the code, so I think I can switch the default to be 
> > `true` for printing the "tokens-before-eof marker" and if a caller has a 
> > need to ignore it it can pass `false` for the parameter.
> If someone uses `-print-dependency-directives-minimized-source` and creates a 
> minimized file for each header, it will "parse", but it won't behave 
> correctly for multiple includes, right?  My preference is we don't allow 
> printing this without the TokBEOF.  If we care about making it parse, we 
> should add a real token of some kind -- maybe there is a no-op `#pragma` or 
> something?
Oops, missed half my comment. Meant to also add:

> But the tests that pass -print-dependency-directives-minimized-source don't 
> try to parse the code, so I think I can switch the default to be true for 
> printing the "tokens-before-eof marker" and if a caller has a need to ignore 
> it it can pass false for the parameter.

SGTM


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D133357/new/

https://reviews.llvm.org/D133357

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