Adding ghostty-vt as a dependency breaks builds macos

[kennedymj97]

Issue Description

Hey, encountered an issue trying to add libghostty-vt as a dependency in a project I am working on. My machine is macOS and after following the examples of how to add libghostty-vt (zig version) as a dependency and running zig build the build failed with a stack trace seeming to indicate it was trying to use some macOS SDKs I do not have setup.

I may be wrong but I would not expect adding libghostty-vt as a dependency should need these sdks. Expect there is some build configuration detecting I am on macOS and trying to interact with these SDKs.

I managed to work around it for now by using the following in my build.zig:

    if (b.lazyDependency("ghostty", .{
        .target = b.resolveTargetQuery(.{ .os_tag = .freestanding }),
        .simd = false,
    })) |dep| {
        exe_mod.addImport(
            "ghostty-vt",
            dep.module("ghostty-vt"),
        );
    }

But I would like to have simd support! Would hope to not need to change the target myself.

Expected Behavior

I would expect to be able to import ghostty-vt as the examples detail and be able to run zig build on macOS without issue.

Actual Behavior

> zig build
thread 2023956 panic: unhandled error
$HOME/.local/bin/zig-dist/lib/std/zig/LibCInstallation.zig:174:13: 0x10464973f in findNative (build)
            return error.DarwinSdkNotFound;
            ^
$HOME/developer/ghostty/pkg/apple-sdk/build.zig:47:22: 0x104648cd7 in addPaths (build)
        const libc = try std.zig.LibCInstallation.findNative(.{
                     ^
$HOME/developer/ghostty/pkg/freetype/build.zig:77:9: 0x10468e13f in buildLib__anon_97740 (build)
        try apple_sdk.addPaths(b, lib);
        ^
$HOME/developer/ghostty/pkg/freetype/build.zig:45:21: 0x104692777 in build (build)
        const lib = try buildLib(b, module, .{
                    ^
$HOME/.local/bin/zig-dist/lib/std/Build.zig:2215:25: 0x1045d361b in runBuild__anon_75532 (build)
        .error_union => try build_zig.build(b),
                        ^
$HOME/.local/bin/zig-dist/lib/std/Build.zig:2195:40: 0x104748417 in dependencyInner__anon_122457 (build)
        sub_builder.runBuild(bz) catch @panic("unhandled error");
                                       ^
$HOME/.local/bin/zig-dist/lib/std/Build.zig:1999:35: 0x104651467 in lazyDependency__anon_94783 (build)
            return dependencyInner(b, name, pkg.build_root, if (@hasDecl(pkg, "build_zig")) pkg.build_zig else null, pkg_hash, pkg.deps, args);
                                  ^
$HOME/developer/ghostty/src/build/SharedDeps.zig:141:25: 0x10464d93b in add (build)
    if (b.lazyDependency("freetype", .{
                        ^
$HOME/developer/ghostty/src/build/GhosttyLib.zig:44:32: 0x10467d773 in initStatic (build)
    var lib_list = try deps.add(lib);
                               ^
$HOME/developer/ghostty/src/build/GhosttyXCFramework.zig:28:42: 0x10467f2b3 in init (build)
    const ios = try GhosttyLib.initStatic(b, &try deps.retarget(
                                         ^
$HOME/developer/ghostty/build.zig:152:65: 0x104682097 in build (build)
        const xcframework = try buildpkg.GhosttyXCFramework.init(
                                                                ^
$HOME/.local/bin/zig-dist/lib/std/Build.zig:2215:44: 0x1045d32df in runBuild__anon_75520 (build)
        .error_union => try build_zig.build(b),
                                           ^
$HOME/.local/bin/zig-dist/lib/std/Build.zig:2195:29: 0x1045ad097 in dependencyInner__anon_71834 (build)
        sub_builder.runBuild(bz) catch @panic("unhandled error");
                            ^
$HOME/.local/bin/zig-dist/lib/std/Build.zig:1999:35: 0x104590277 in lazyDependency__anon_67670 (build)
            return dependencyInner(b, name, pkg.build_root, if (@hasDecl(pkg, "build_zig")) pkg.build_zig else null, pkg_hash, pkg.deps, args);
                                  ^
$HOME/developer/ghostty/example/zig-vt/build.zig:18:25: 0x104573beb in build (build)
    if (b.lazyDependency("ghostty", .{
                        ^
$HOME/.local/bin/zig-dist/lib/std/Build.zig:2214:33: 0x104562aff in runBuild__anon_21191 (build)
        .void => build_zig.build(b),
                                ^
$HOME/.local/bin/zig-dist/lib/compiler/build_runner.zig:366:29: 0x10455ac73 in main (build)
        try builder.runBuild(root);
                            ^
$HOME/.local/bin/zig-dist/lib/std/start.zig:627:37: 0x104564e37 in main (build)
            const result = root.main() catch |err| {
                                    ^
???:?:?: 0x19c038273 in ??? (???)
???:?:?: 0x993a7fffffffffff in ??? (???)

Reproduction Steps

On macos:

1. Clone ghostty repo
2. Navigate to example/zig-vt
3. Run zig build

Ghostty Logs

No response

Ghostty Version

Ghostty main branch commit: `960b181df7b3d98a66034bc96138961db0b00c7e`

zig version: 0.15.2

OS Version Information

macos Sequioa Version 15.3.1 (24D70)

(Linux only) Display Server

None

(Linux only) Desktop Environment/Window Manager

No response

Minimal Ghostty Configuration

n/a

Additional Relevant Configuration

No response

I acknowledge that:

• I have reviewed the FAQ and confirm that my issue is NOT among them.
• I have searched the Ghostty repository (both open and closed Discussions and Issues) and confirm this is not a duplicate of an existing issue or discussion.
• I have checked the "Preview" tab on all text fields to ensure that everything looks right, and have wrapped all configuration and code in code blocks with a group of three backticks (```) on separate lines.

[rhodes-b]

I don't think there is any requirement to set the target to freestanding just setting the simd option to false should work.

Why does the simd option require macos sdk, because it uses a dependency that requires it
https://github.com/ghostty-org/ghostty/blob/main/pkg/simdutf/build.zig#L18-L21

setting the option to false should be all thats required since the dependency is a lazy dep and ghostty protects against using it
https://github.com/ghostty-org/ghostty/blob/main/src/build/GhosttyZig.zig#L80-L82

[kennedymj97]

Thanks for the reply.

Hmmm only setting the simd option to false doesn't seem to help me. Am still getting the reported errors after updating the dep build.zig in the zig-vt example to:

    // You'll want to use a lazy dependency here so that ghostty is only
    // downloaded if you actually need it.
    if (b.lazyDependency("ghostty", .{
        // Setting simd to false will force a pure static build that
        // doesn't even require libc, but it has a significant performance
        // penalty. If your embedding app requires libc anyway, you should
        // always keep simd enabled.
        .simd = false,
    })) |dep| {
        exe_mod.addImport(
            "ghostty-vt",
            dep.module("ghostty-vt"),
        );
    }

[kennedymj97]

If anyone else comes across this after installing xcode (full version from the app store) builds work fine with simd enabled.

[mitchellh]

Fixed here: #13660