From 44b105a38d966a43dcd407b971ea39fe26353eab Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 31 Jan 2022 21:11:41 -0700
Subject: [PATCH] stage2: make --debug-log work by default for debug builds

can be disabled with `-Dlog=false`
---
 build.zig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/build.zig b/build.zig
index c8f0438ab5..f2d154c702 100644
--- a/build.zig
+++ b/build.zig
@@ -221,7 +221,8 @@ pub fn build(b: *Builder) !void {
         test_stage2.linkLibC();
     }
 
-    const enable_logging = b.option(bool, "log", "Whether to enable logging") orelse false;
+    const is_debug = mode == .Debug;
+    const enable_logging = b.option(bool, "log", "Enable debug logging with --debug-log") orelse is_debug;
     const enable_link_snapshots = b.option(bool, "link-snapshot", "Whether to enable linker state snapshots") orelse false;
 
     const opt_version_string = b.option([]const u8, "version-string", "Override Zig version string. Default is to find out with git.");