[cfe-dev] [PATCH] Preserve -fretain-comments-from-system-headers in modules

[Ben Langmuir]

[moving to cfe-commits]

> I think that serialization is automatically handled for all options
> defined in LangOptions.def (ASTWriter::WriteControlBlock).  But
> because this is a BENIGN_LANGOPT, ASTReader seems to skip checking
> that they match.

Hmm, I was worried about changing this option from BENIGN_LANGOPT to LANGOPT because it would affect other code, but now that I look at it more closely it seems to do just what I want.   Additionally langopt also adds this flag to -module-file-info, which seems like a good thing.  I’ve attached an updated patch that switches to LANGOPT.
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Ben