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'zcompile -t' prints: "zcompile: zwc file has wrong version" It seems from the source: https://github.com/zsh-users/zsh/blob/master/Src/parse.c#L3250 that in order to use a zwc file, the version of zsh it was created with must match exactly the version of zsh trying to load it? I was expecting zwc files to be more portable than this, given the comments in the manual: The created file always contains two versions of the compiled format, one for big-endian machines and one for small-endian machines. The upshot of this is that the compiled file is machine independent [...] The comments in Src/parse.c make me think that the intent was that zwc files should be loadable so long as FD_MAGIC|FD_OMAGIC haven't changed - they last changed in 52b830353 (2001). Ref also https://www.zsh.org/mla/workers/2000/msg01327.html It seems that the ZSH_VERSION check was added back in d296535d3 (2007), "23313: fix test for incorrect version in ZWC file". I noticed this issue after zcompiling on a RHEL9 system (zsh 5.8) where HOME is also accessible to RHEL8 (zsh 5.5) hosts. It's a bit of a nuisance to have to maintain a separate zwc file for each zsh version. Is it intentional that zwc files aren't portable between zsh versions? If so, it would seem like the endian duplication wouldn't be that useful in practice? Thanks.