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openttd_version: OpenTTD var 21/1A result has changed since OpenTTD moved to git #80

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andythenorth opened this issue Feb 10, 2020 · 8 comments
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openttd_version: OpenTTD var 21/1A result has changed since OpenTTD moved to git #80

andythenorth opened this issue Feb 10, 2020 · 8 comments

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@andythenorth
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See https://newgrf-specs.tt-wiki.net/wiki/GlobalVariables#OpenTTD_Version_.2821_.2F_A1.29

When OpenTTD was versioned using SVN the lower bits of var 21/A1 contained the SVN revision. Since OpenTTD 1.9 these bits are unused.

nml has openttd_version var. It also has a built-in function version_openttd(MAJOR, MINOR, BUILD, REVISION) which can test for a specific svn version of OpenTTD. That won't return valid results with OpenTTD >= 1.9
@nielsmh
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nielsmh commented Feb 10, 2020 •
edited

The SVN revision bits are frozen to one past the last SVN revision number, they are not zero.
There are also AI and GS that depend on the version number, repurposing it will at the very least need to make sure it remains greater than the final SVN revision.

@andythenorth
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So is any change needed, other than updating nml docs?

@nielsmh
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nielsmh commented Feb 10, 2020

I doubt it. See also OpenTTD/OpenTTD#6843

@andythenorth
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So note here that svn version is no longer useful after a specific OpenTTD rev (which?) https://newgrf-specs.tt-wiki.net/wiki/NML:General

@planetmaker
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r28004 seems the last SVN rev. I added as much to the wiki... not sure what OpenTTD code says though.

@nielsmh
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nielsmh commented Feb 18, 2020

Yes, 28004 is the hardcoded "final" SVN revision.
https://github.com/OpenTTD/OpenTTD/blob/4552b17691fa7c4f1fdb4ca7652ca48278a68fec/src/rev.cpp.in#L70-L83

@andythenorth
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Thanks, so the nml docs are accurate "only valid until OpenTTD r28004 / 1.9.0. In later versions the revision is fixed". The wording there could be improved for clarity, I'll do that now.

@andythenorth
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Done

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@nielsmh @andythenorth @planetmaker