miyuki added inline comments.

================
Comment at: clang/lib/Basic/SourceManager.cpp:587
+    Diag.Report(IncludePos, diag::err_include_too_large);
+    exit(1);
+  }
----------------
dnsampaio wrote:
> miyuki wrote:
> > dnsampaio wrote:
> > > For debug builds, I could not find any other way to not reach an assert 
> > > failure other than exiting here. Perhaps there is a more llvm specific 
> > > way to die? llvm_unreachable() ?
> > There is a similar error `err_file_too_large`. How is it handled? 
> > `llvm_unreachable` is intended for code that is unreachable: it causes an 
> > assertion failure in debug builds and undefined behavior in release builds.
> The `err_file_too_large` above in this file allows the function to finish and 
> return further on. Here, we assert false before the message being printed.
> If `llvm_unreachable` is undefined behavior, then I should stick to exit(1) ?
I think you should return an invalid file ID (i.e. `return FileID();` and 
propagate the error through the call stack. Clang can be used as a library, so 
you can't just call exit(), this would terminate the user's program.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D70183/new/

https://reviews.llvm.org/D70183



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