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Alistair Lynn wrote:
> I'm trying to build (as the subject line would suggest) LuaJIT
> on Darwin (Mac OS X) as a UB for both 32- and 64-bit x86.

I'm sorry, but building as a universal binary is not a supported
configuration for various intricate reasons. You've already
discovered a few of them.

Since LuaJIT makes use of all CPU features on both x86 and x64,
there's little performance difference. So if there's no other
compelling reason to create a multi-arch app, maybe just ship a
32 bit binary.