error: type 'u29' has no members

[Xyndra]

C:\Users\[Username]\AppData\Local\zig\p\jetzig-0.0.0-IpAgLRqoDwB3GoVo2zbHr3So_zhmu9ZbMHSQbNLa54BI\build.zig:465:92: error: type 'u29' has no members
    const source = try file.readToEndAllocOptions(b.allocator, @intCast(stat.size), null, .of(u8), 0);
                                                                                          ~^~

this happens whenever I am doing jetzig server or zig build run.

PS D:\Code\Zig\organized> zig version
0.14.1

[mitteneer]

Jetzig has been tracking the zig master branch for a while, although I expect due to recent updates it may not be safe to update to master. The minimum supported version as defined in build.zig.zon is 0.15.0-dev.355+206bd1ced, so you'll be guaranteed success there

[Xyndra]

Where can I get non-release versions for zig?

[mitteneer]

I personally use https://www.zvm.app/, and that lets you specify specific commits. There are probably other methods/tools, but this has worked for me. Fwiw, master may indeed work, but with the changes to writers and io, and also with relatively slow Jetzig development as of late, I've erred on the side of sticking with whatever version I've been on that works

Edit: This may not actually provide you the functionality you need the more I'm reading. I thought for sure it did what I suggested, but I may be wrong...

[Xyndra]

yeah, I don't think it does:

2025/07/19 18:05:25 ERRO unsupported Zig version: "0.15.0-dev.355+206bd1ced"
2025/07/19 18:07:28 ERRO unsupported Zig version: "0.15.0-dev.355"
2025/07/19 18:06:04 ERRO unsupported Zig version: "206bd1ced"
2025/07/19 18:10:42 ERRO unsupported Zig version: "206bd1ced863f0757a2e15b74b533170460dd328"

[mitteneer]

My apologies. anyzig is the only other Zig version management tool that I'm aware of: https://github.com/marler8997/anyzig

Otherwise, I don't think I can be very helpful :/

[Xyndra]

yeah both master and 1.14.1 fail and both of the tools are unable to download an intermediate version (probably because it isn't up on the server)

[tabre]

I tried with 0.14.0 and 0.14.1 and received the same error as OP, then tried master and realized some significant changes have been made to the Zig build system because nothing in the build.zig seemed to work. This framework looks great and I was going to try it for a new project I'm working on, but I would have to rewrite the build.zig file (I might do it) and who knows what else to get it to compile.

No disrespect to the maintainers, but it seems like a pretty bold choice to track master when it could leave your project in a state like this where nobody can build it unless they happen to have downloaded a compatible Zig version before the one with the breaking changes was released. Maybe consider having a stable release?

Unless I'm missing something... is there a way to download the exact Zig version that is needed?

[Xyndra]

It seems like the only way to really get that would be to clone a specific commit from github and then build it yourself, but I am not really willing to do that since it ruines pretty much all possibilities for collaboration and also CI/CD pipelines

[bobf]

Hi @Xyndra , thanks for looking into this. I'll make some time in the next few days to take a closer look, I'm sure we'll be able to get everything working seamlessly again, until the next time Zig introduces more breaking changes. : )

[panariga]

Unpleasant situation for arm64. Build from source needed for platform.
Tried Jetzig with Zig 14.1 and latest master: both failed. In one case there is incompatible .zon import, for other - lot of constants was renamed in Build.
Maybe someone knows on what commit/date both Jetzig and Zig was compatible last time?