From 0058564cb50b6e9403793d38df7bc3b8a850f5ef Mon Sep 17 00:00:00 2001
From: Mynacol <Mynacol@users.noreply.github.com>
Date: Thu, 30 Apr 2026 14:57:00 +0000
Subject: [PATCH] deno: Stop setting `_LIBCPP_HARDENING_MODE` on rusty-v8

And rely on the upstream project.
---
 pkgs/by-name/de/deno/rusty-v8/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/by-name/de/deno/rusty-v8/default.nix b/pkgs/by-name/de/deno/rusty-v8/default.nix
index c93f2117b36b..b781960359c1 100644
--- a/pkgs/by-name/de/deno/rusty-v8/default.nix
+++ b/pkgs/by-name/de/deno/rusty-v8/default.nix
@@ -144,6 +144,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   buildFeatures = [ "simdutf" ];
 
+  # rusty-v8 has its own default hardening flags, which are "extensive" for release builds as long as `use_custom_libcxx` stays true.
+  # Avoids many warnings about redefined macros (on build failures) and uses the upstream flag.
+  hardeningDisable = [ "libcxxhardeningfast" ];
+
   checkFlags = [
     # These tests probably fail due to a more recent rustc version (upstream: 1.89.0, here: 1.93.0)
     "--skip=ui"