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build: replace lib-vt step with -Demit-lib-vt option

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Remove the dedicated `zig build lib-vt` step and replace it with a
`-Demit-lib-vt` build option. This fixes two problems:

1. We can default XCFramework, app, etc. steps to false if emit-lib-vt
   is true, so that the lib-vt build doesn't pull in unrelated
   artifacts. **Most importantly, lib-vt alone can be build without
   full Xcode installations.**

2. We can build lib-vt as part of a bundle with other artifacts if we
   really want.
This commit is contained in:
Mitchell Hashimoto
2026-03-20 20:59:27 -07:00
parent e8fb7eabad
commit 3fc04fd4ae
9 changed files with 43 additions and 40 deletions
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39
build.zig
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@@ -35,7 +35,6 @@ pub fn build(b: *std.Build) !void {
// All our steps which we'll hook up later. The steps are shown
// up here just so that they are more self-documenting.
const libvt_step = b.step("lib-vt", "Build libghostty-vt");
const run_step = b.step("run", "Run the app");
const run_valgrind_step = b.step(
"run-valgrind",
@@ -91,16 +90,6 @@ pub fn build(b: *std.Build) !void {
check_step.dependOn(dist.install_step);
}
// libghostty (internal, big)
const libghostty_shared = try buildpkg.GhosttyLib.initShared(
b,
&deps,
);
const libghostty_static = try buildpkg.GhosttyLib.initStatic(
b,
&deps,
);
// libghostty-vt
const libghostty_vt_shared = shared: {
if (config.target.result.cpu.arch.isWasm()) {
@@ -115,7 +104,6 @@ pub fn build(b: *std.Build) !void {
&mod,
);
};
libghostty_vt_shared.install(libvt_step);
libghostty_vt_shared.install(b.getInstallStep());
// Helpgen
@@ -128,26 +116,29 @@ pub fn build(b: *std.Build) !void {
resources.install();
if (i18n) |v| v.install();
}
} else {
// Libghostty
} else if (!config.emit_lib_vt) {
// The macOS Ghostty Library
//
// Note: libghostty is not stable for general purpose use. It is used
// heavily by Ghostty on macOS but it isn't built to be reusable yet.
// As such, these build steps are lacking. For example, the Darwin
// build only produces an xcframework.
// This is NOT libghostty (even though its named that for historical
// reasons). It is just the glue between Ghostty GUI on macOS and
// the full Ghostty GUI core.
const lib_shared = try buildpkg.GhosttyLib.initShared(b, &deps);
const lib_static = try buildpkg.GhosttyLib.initStatic(b, &deps);
// We shouldn't have this guard but we don't currently
// build on macOS this way ironically so we need to fix that.
if (!config.target.result.os.tag.isDarwin()) {
libghostty_shared.installHeader(); // Only need one header
libghostty_shared.install("libghostty.so");
libghostty_static.install("libghostty.a");
lib_shared.installHeader(); // Only need one header
lib_shared.install("libghostty.so");
lib_static.install("libghostty.a");
}
}
// macOS only artifacts. These will error if they're initialized for
// other targets.
if (config.target.result.os.tag.isDarwin()) {
if (config.target.result.os.tag.isDarwin() and
(config.emit_xcframework or config.emit_macos_app))
{
// Ghostty xcframework
const xcframework = try buildpkg.GhosttyXCFramework.init(
b,
@@ -202,7 +193,9 @@ pub fn build(b: *std.Build) !void {
// On macOS we can run the macOS app. For "run" we always force
// a native-only build so that we can run as quickly as possible.
if (config.target.result.os.tag.isDarwin()) {
if (config.target.result.os.tag.isDarwin() and
(config.emit_xcframework or config.emit_macos_app))
{
const xcframework_native = try buildpkg.GhosttyXCFramework.init(
b,
&deps,