addition of a new keyword

[Hideki IWAMOTO]

I tried to add support of keyword __thread which was introduced in GCC-3.3.
Gperf caused an error. What should I do?


+ gperf '--key-positions=1-3,6,$' --language=C --struct-type --slot-name=name 
--hash-fn-name=cpp_hash --lookup-fn-name=cpp_lookup

Internal error, duplicate value 82:
try options -D or -r, or use new key positions.

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Hideki IWAMOTO  address@hidden