On Nov 5, 2012, at 11:45 AM, Douglas Gregor <[email protected]> wrote:

> Author: dgregor
> Date: Mon Nov  5 13:45:09 2012
> New Revision: 167397
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=167397&view=rev
> Log:
> Hash the various compiler version, target, preprocessor, and
> header-search options into the module hash. We're just using
> ADT/Hashing.hpp for this, which isn't as cryptographically strong as
> I'd like, but it'll do. If someone contributes (say) and MD4
> implementation, we'd happily switch to that.

… but before they do, make sure to bring it up on llvmdev.  We don't want to 
run into issues with crypto export regulations etc.

-Chris
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