Help understanding this linking code / code base

[brazen sedge]

I'm trying to use cudaz but I don't understand how the linking works here - https://github.com/akhildevelops/cudaz/blob/304adc4ad82f14689aa1d311bd601da30372b729/example/increment/build.zig#L11
I don't see a module that lines up with that value. There is no file called cudaz.zig or even Cudaz type somewhere.
In build.zig:

    // Point to cudaz dependency
    const cudaz_dep = b.dependency("cudaz", .{});

    // Fetch and add the module from cudaz dependency
    const cudaz_module = cudaz_dep.module("cudaz");
    exe.root_module.addImport("cudaz", cudaz_module);

I haven't seen a dependency linked like this. I tried to copy/paste this code and it complains there is no addImport in root_module.

This module gets imported here - https://github.com/akhildevelops/cudaz/blob/304adc4ad82f14689aa1d311bd601da30372b729/example/increment/src/main.zig#L2 - but I don't understand where the other values are coming from:

const Cuda = @import("cudaz");
const CuDevice = Cuda.Device;
const CuCompile = Cuda.Compile;
const CuLaunchConfig = Cuda.LaunchConfig;

Where is Device, Compile, LaunchConfig coming from? My running theory is that cudaz is some sort of synthetic module created in build.zig. Please correct my understanding.

[dapper creek]

the module comes from the build.zig.zon. The build system fetches deps from that and exposes them through b.depedency

since the url in the zon is the head of the repo, its using the repo's root level build.zig/.zon which contains this: https://github.com/akhildevelops/cudaz/blob/304adc4ad82f14689aa1d311bd601da30372b729/build.zig#L67

[brazen sedge]

If I try to build the example from the project I get this error:

error: expected type 'zig.CrossTarget', found 'zig.system.NativeTargetInfo'
    const exe = b.addExecutable(.{ .name = "main", .root_source_file = .{ .path = "src/main.zig" }, .target = b.host });
                                                                                                    ~~~~~~~~^~~~~~~~
/home/kevinedey/.asdf/installs/zig/0.12.0-dev/lib/std/zig/system/NativeTargetInfo.zig:1:1: note: struct declared here
const std = @import("../../std.zig");
^~~~~
/home/kevinedey/.asdf/installs/zig/0.12.0-dev/lib/std/zig/CrossTarget.zig:1:1: note: struct declared here
//! Contains all the same data as `Target`, additionally introducing the concept of "the native target".
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
referenced by:
    runBuild__anon_6849: /home/kevinedey/.asdf/installs/zig/0.12.0-dev/lib/std/Build.zig:1883:37
    steps__anon_6672: /home/kevinedey/.asdf/installs/zig/0.12.0-dev/lib/build_runner.zig:969:29
    remaining reference traces hidden; use '-freference-trace' to see all reference traces

Has the build system changed to make this way obsolete?

[dapper creek]

build system changes quite frequently. Need to see what zig version the project was written under

[brazen sedge]

What's the equivalent new syntax?

[brazen sedge]

@solemn meteor - is this your library?

[brazen sedge]

Trying zig version 0.10.0 and 0.11.0 didn't work either.

[brazen sedge]

I'm kind of tearing my hair out with this one. Progressing with different errors.

/home/kevinedey/Code/Personal/cudaz/build.zig:67:51: error: no field named 'root_source_file' in struct 'Build.CreateModuleOptions'
    const cudaz_module = b.addModule("cudaz", .{ .root_source_file = .{ .path = "src/lib.zig" } });
                                                  ^~~~~~~~~~~~~~~~
/home/kevinedey/.asdf/installs/zig/0.12.0-dev/lib/std/Build.zig:860:33: note: struct declared here
pub const CreateModuleOptions = struct {

But searching through the source CreateModuleOptions doesn't exist. Module.CreateOptions does exist though and these values do seem to line up so.... huh?

[dapper creek]

source for master branch?

[brazen sedge]

Yes

Should I be on a different branch?

I'm working with 0.12.0-dev on my machine.

Should I go get the latest?

[dapper creek]

-dev is normally "the latest" unless your commit is pretty old

[brazen sedge]

cudaz zig version                                          
0.12.0-dev.1845+21ae64852
➜  cudaz zig build                                            
/home/kevinedey/Code/Personal/cudaz/build.zig:67:51: error: no field named 'root_source_file' in struct 'Build.CreateModuleOptions'
    const cudaz_module = b.addModule("cudaz", .{ .root_source_file = .{ .path = "src/lib.zig" } });
                                                  ^~~~~~~~~~~~~~~~
/home/kevinedey/.asdf/installs/zig/0.12.0-dev/lib/std/Build.zig:860:33: note: struct declared here
pub const CreateModuleOptions = struct {
                                ^~~~~~
referenced by:
    runBuild__anon_6851: /home/kevinedey/.asdf/installs/zig/0.12.0-dev/lib/std/Build.zig:1883:37
    steps__anon_6672: /home/kevinedey/.asdf/installs/zig/0.12.0-dev/lib/build_runner.zig:969:29
    remaining reference traces hidden; use '-freference-trace' to see all reference traces

I refetched latest and it's the same.

[dapper creek]

your zig looks like its too old. Thats there on master in Module.zig, meanwhile yours is pointing to code in Build.zig

[brazen sedge]

Does anyone in the Zig community use version managers like asdf, rtx (mise), etc?

[dapper creek]

i personally just have a script to pull down latest into a folder which is symlinked to somewhere in PATH

[brazen sedge]

I'm wondering if it's asdf linking error pointing to the wrong one.

[dapper creek]

probably. heard some people use zigup too

[brazen sedge]

Finally working. Not sure how old that version of Zig was that I was using. Also, not sure if the asdf plugin is broken as it didn't get the right thing but it seemed like it worked properly when it didn't. I patched it so all good now.