From 80a81a80707477df9aadceaec78f256af54d7fa8 Mon Sep 17 00:00:00 2001
From: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>
Date: Fri, 31 Oct 2025 17:26:57 -0400
Subject: [PATCH] buildMozillaMach: enable LTO for Darwin

---
 pkgs/build-support/build-mozilla-mach/default.nix | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pkgs/build-support/build-mozilla-mach/default.nix b/pkgs/build-support/build-mozilla-mach/default.nix
index 1545c9335cdd..ad35fb74295d 100644
--- a/pkgs/build-support/build-mozilla-mach/default.nix
+++ b/pkgs/build-support/build-mozilla-mach/default.nix
@@ -130,7 +130,9 @@ in
   jemallocSupport ? !stdenv.hostPlatform.isMusl,
   jemalloc,
   ltoSupport ? (
-    stdenv.hostPlatform.isLinux && stdenv.hostPlatform.is64bit && !stdenv.hostPlatform.isRiscV
+    (stdenv.hostPlatform.isLinux || stdenv.hostPlatform.isDarwin)
+    && stdenv.hostPlatform.is64bit
+    && !stdenv.hostPlatform.isRiscV
   ),
   overrideCC,
   buildPackages,
@@ -466,7 +468,7 @@ buildStdenv.mkDerivation {
     "--host=${buildStdenv.buildPlatform.config}"
     "--target=${buildStdenv.hostPlatform.config}"
   ]
-  # LTO is done using clang and lld on Linux.
+  # LTO is done using clang and lld.
   ++ lib.optionals ltoSupport [
     "--enable-lto=cross,full" # Cross-Language LTO
     "--enable-linker=lld"