Seg-faults in GCC 4.9.2

[Michael Muller]

After upgrading my desktop to the latest version of Debian, I've discovered
that the Crack executor reliably seg-faults when compiled under GCC 4.9.2.
This appears to happen with an optimization level of -O2 or greater,
suggesting that some new optimization is exposing some bugs.

I'm in the process of trying to track the problem(s) down, but the work-around
for users on GCC 4.9 is to compile at -O1. You can do this with:

make CXXFLAGS="-O1"

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michaelMuller = mmu...@enduden.com | http://www.mindhog.net/~mmuller
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Reloaded.
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[Michael Muller]

Found it! Off-by-one error leading to a buffer overflow. I just checked in a
fix.

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