From 842fbb78ef3f573e88f75ff7a98198b2cad986c8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adri=C3=A0=20Arrufat?= <adria.arrufat@gmail.com>
Date: Tue, 12 May 2026 15:12:50 +0200
Subject: [PATCH] build: print version banner to stderr, not stdout

The build script wrote the version line to stdout, polluting any pipeline
that captures program output via 'zig build run' or similar. Banners
belong on stderr.
---
 build.zig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/build.zig b/build.zig
index 22710679..052fb752 100644
--- a/build.zig
+++ b/build.zig
@@ -44,8 +44,8 @@ pub fn build(b: *Build) !void {
     const wpt_extensions = b.option(bool, "wpt_extensions", "Extend WebAPI with WPT driver behavior") orelse false;
 
     const version = resolveVersion(b);
-    var stdout = std.fs.File.stdout().writer(&.{});
-    try stdout.interface.print("Lightpanda {f}\n", .{version});
+    var stderr = std.fs.File.stderr().writer(&.{});
+    try stderr.interface.print("Lightpanda {f}\n", .{version});
 
     const version_string = b.fmt("{f}", .{version});
     const version_encoded = std.mem.replaceOwned(u8, b.allocator, version_string, "+", "%2B") catch @panic("OOM");