llvm dev - Jul 2016 - RFC: YAML mappings with keys that are unknown at compile time

Hi All,

I have a patch to the YAML I/O library to support mappings with keys that
are unknown at compile time. This allows the serialization of an
llvm::StringMap<T> to a YAML mapping.  Currently, this functionality is
used in Sony specific Clang Static Analyzer checkers.

It would help with our local merges to have this patch upstream, even
though it won't be used by anything yet. Will these changes be helpful for
others / future work?

Any suggestions for improving the patch are welcome.

Regards,

Sean Eveson
SN Systems - Sony Computer Entertainment Group
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