Adding zflecs to sokol-based build config #749

Umenokin · 2025-04-15T05:58:29Z

Umenokin
Apr 15, 2025

Hi folks,

I am trying to confirm that I will be able to use zflecs and possibly other zig-gamedev libs in my project.
It seems I am able to compile it successfully for the native platforms, but getting an error building it for the web.
My steps:

Add zflecs to zon file: zig fetch --save=zflecs git+https://github.com/zig-gamedev/zflecs.git

Add to build config.
2.1 Native

const exe_mod = b.createModule(.{
     .root_source_file = b.path("src/main.zig"),
     .target = target,
     .optimize = options.optimize,
 });

 const exe = b.addExecutable(.{
     .name = "app",
     .root_module = exe_mod,
 });

 exe.root_module.addImport("sokol", dep_sokol.module("sokol"));

 const zflecs = b.dependency("zflecs", .{});
 exe.root_module.addImport("zflecs", zflecs.module("root"));
 exe.linkLibrary(zflecs.artifact("flecs"));

2.2 Web

const lib = b.addStaticLibrary(.{
    .name = "app",
    .target = target,
    .optimize = options.optimize,
    .root_source_file = b.path("src/main.zig"),
});

lib.root_module.addImport("sokol", dep_sokol.module("sokol"));

const zflecs = b.dependency("zflecs", .{});
lib.root_module.addImport("zflecs", zflecs.module("root"));
lib.linkLibrary(zflecs.artifact("flecs"));

// create a build step which invokes the Emscripten linker
const emsdk = dep_sokol.builder.dependency("emsdk", .{});
const link_step = try sokol.emLinkStep(b, .{
    .lib_main = lib,
    .target = target,
    .optimize = options.optimize,
    .emsdk = emsdk,
    .use_webgl2 = options.backend != .wgpu,
    .use_webgpu = options.backend == .wgpu,
    .use_emmalloc = true,
    .use_filesystem = false,
    .release_use_closure = options.backend != .wgpu,
    .shell_file_path = dep_sokol.path("src/sokol/web/shell.html"),
});
// attach Emscripten linker output to default install step
b.getInstallStep().dependOn(&link_step.step);
// ...and a special run step to start the web build output via 'emrun'
const run = sokol.emRunStep(b, .{ .name = "app", .emsdk = emsdk });
run.step.dependOn(&link_step.step);
b.step("run", "Run app").dependOn(&run.step);

Add basic initialization to make sure the linking is ok:

const sokol = @import("sokol");
const ecs = @import("zflecs");

...

pub fn main() void {
    const world = ecs.init();
    defer _ = ecs.fini(world);

    sapp.run(.{
        .init_cb = init,
        .frame_cb = frame,
        .cleanup_cb = cleanup,
        .width = 640,
        .height = 480,
        .icon = .{ .sokol_default = true },
        .window_title = "clear.zig",
        .logger = .{ .func = slog.func },
        .win32_console_attach = true,
    });
}

Native build works just fine, but getting an error when building for the web zig build -Dtarget=wasm32-emscripten

/Users/user/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/macos-aarch64-0.14.0/lib/std/debug.zig:870:24: error: no field named 'base_address' in struct 'debug.SelfInfo.Module__struct_7161'
                module.base_address,
                       ^~~~~~~~~~~~
/Users/user/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/macos-aarch64-0.14.0/lib/std/debug/SelfInfo.zig:798:27: note: struct declared here
    .wasi, .emscripten => struct {
                          ^~~~~~
error: the following command failed with 1 compilation errors:
/Users/user/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/macos-aarch64-0.14.0/zig build-lib -ODebug -target wasm32-emscripten -mcpu baseline -I /Users/user/dev/test-app/app-client/.zig-cache/o/ee37129807542079360a73b5258f6822 --dep sokol --dep zflecs -Mroot=/Users/user/dev/test-app/app-client/src/main.zig -I /Users/user/dev/test-app/app-client/.zig-cache/o/b29ba9067f6a406b2885eaf016943dfe -Msokol=/Users/user/.cache/zig/p/sokol-0.1.0-pb1HK1CHLACn6xGB1TLwO5bgMQNY735HMVDwXZ-UHj0C/src/sokol/sokol.zig -Mzflecs=/Users/user/.cache/zig/p/zflecs-0.2.0-dev-1PN3yuhMNQDj3J57z74E3AIGM8bmVg3FhAd6XZKb_A9W/src/zflecs.zig -lc --cache-dir /Users/user/dev/test-app/app-client/.zig-cache --global-cache-dir /Users/user/.cache/zig --name app -static --zig-lib-dir /Users/user/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/macos-aarch64-0.14.0/lib/ --listen=- 
Build Summary: 4/8 steps succeeded; 1 failed
install transitive failure
└─ install generated/ transitive failure
   ├─ emcc transitive failure
   │  ├─ zig build-lib app Debug wasm32-emscripten 1 errors
   │  └─ zig build-lib app Debug wasm32-emscripten (+6 more reused dependencies)
   └─ emcc (+4 more reused dependencies)
error: the following build command failed with exit code 1:
/Users/user/dev/test-app/app-client/.zig-cache/o/3b467ad4105444738519ed65b7850836/build /Users/user/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/macos-aarch64-0.14.0/zig /Users/user/Library/Application Support/Code/User/globalStorage/ziglang.vscode-zig/zig/macos-aarch64-0.14.0/lib /Users/user/dev/test-app/app-client /Users/user/dev/test-app/app-client/.zig-cache /Users/user/.cache/zig --app 0x4bec60fe -Z0cf29144e1057ec0 -Dtarget=wasm32-emscripten

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Adding zflecs to sokol-based build config #749

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Adding zflecs to sokol-based build config #749

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Umenokin Apr 15, 2025

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Umenokin
Apr 15, 2025