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...hasn't been merged yet): https://git.samba.org/?p=rsync-patches.git;a=blob_plain;f=xxhash.diff;hb=6f3c2cd839ccbae8dc74222f9f8a60aef0156d43 ..wayne.. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.samba.org/pipermail/rsync/attachments/20200521/114aed7a/attachment.htm>

I've read up some more on the subject, and it seems the proper way to do this with GCC is g++ and target attributes. I've refactored the patch that way, and it indeed uses SSSE3 automatically on supporting CPUs, regardless of the build host, so this should be ideal both for home builders and distros. Getting the code to build right in c++ mode (checksum_sse2.cpp only) was a bit of an