Ok, so it came up again, but I've solved it now, I think. I finally narrowed it down to the Cryptopp library. I had built the library and dragged it to Frameworks and Libraries, and had dragged 7 files to Other Sources (whrlpool.h, cryptlib.h, hex.h, filters.h, des.h, modes.h, secblock.h, aes.h). I’d also added the headers to my main project’s .h file, and added the cryptopp-master directory to the paths for the required targets.
Turns out that I needed to *uncheck* the AU target from the 7 .h files I’d dragged into Other Sources, which went against what I thought is how it worked, but there you go.
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