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Checking the version of Emacs that an ELisp file was compiled with [WAS:
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From: |
Clément Pit-Claudel |
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Subject: |
Checking the version of Emacs that an ELisp file was compiled with [WAS: Re: User-defined record types, v3] |
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Date: |
Tue, 4 Apr 2017 08:48:11 -0400 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 2017-04-04 08:32, Lars Brinkhoff wrote:
> I haven't looked to see if there's a ready-made function for this. The
> code in src/lread.c just looks at the fourth byte of the first line.
> Then it checks that a certain regexp is present near the beginning of
> the file.
Thanks! I can't find such a function on the ELisp side, indeed. Maybe it would
be nice to have one.
My current strategy is to have a "canary": an ELisp file that just records the
Emacs version that compiled it (using eval-when-compile). Loading that file
then allows me to read that version and decides whether I need to recompile the
other files. It'd be nicer to be able to do away with that.
Clément.