From 2e77ff7ca9c25a262969cf55992d0bf2ecaa483d Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 12 Aug 2026 21:45:43 -0700
Subject: [PATCH] zig build: lock stderr before replacing process image

fixes not clearing `std.Progress` output before executing maker
---
 src/main.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/main.zig b/src/main.zig
index f0850ffa08462b1841362e76b602ad11d8012529..c577bf1079e218b0ae2a2ca281f89001f1d4e52f 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -5134,6 +5134,7 @@ fn jitCmdInner(
     }
 
     if (process.can_replace and options.capture == null) {
+        _ = try io.lockStderr(&.{}, .no_color);
         const err = process.replace(io, .{ .argv = child_argv.items, .environ_map = environ_map });
         const cmd = try std.mem.join(arena, " ", child_argv.items);
         fatal("the following command failed to execve with {t}:\n{s}", .{ err, cmd });
-- 
2.54.0