checking in >= 256k file fatally corrupts rcs file

[Achim Gratz]

Ryan Johnson writes:
> So in other words, a misguided performance optimization [1] that
> almost certainly has little measurable impact on performance [2] has
> introduced a silent data corruption bug (or tickled a latent one
> somewhere else). Lovely.

It is not the performance optimization that isn't working, but the code
path through plain stdio while doing a diff that was probably never
exercised (the tests all pass on Cygwin).  Try RCS_MEM_LIMIT=0 to force
stdio.  The error does not occur on Linux and it doesn't seem to be
known to the devs.


Regards,
Achim.
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