From 2b92e8d7c6bcfaec7d9b8457d9a7e88aa85ee268 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Wed, 7 Feb 2024 19:41:23 +0100
Subject: [PATCH] [lto-nix] enable LTO for release builds using Nix

---
 Cargo.nix  | 2 +-
 Cargo.toml | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Cargo.nix b/Cargo.nix
index 86a20104..c4d4c0ea 100644
--- a/Cargo.nix
+++ b/Cargo.nix
@@ -45,7 +45,7 @@ else let
   inherit (rustLib) fetchCratesIo fetchCrateLocal fetchCrateGit fetchCrateAlternativeRegistry expandFeatures decideProfile genDrvsByProfile;
   profilesByName = {
     dev = builtins.fromTOML "lto = \"off\"\n";
-    release = builtins.fromTOML "debug = true\n";
+    release = builtins.fromTOML "codegen-units = 1\nlto = true\nopt-level = \"s\"\nstrip = true\n";
   };
   rootFeatures' = expandFeatures rootFeatures;
   overridableMkRustCrate = f:
diff --git a/Cargo.toml b/Cargo.toml
index baaf5c26..2c39179d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -131,7 +131,8 @@ aws-sdk-config = "1.13"
 aws-sdk-s3 = "1.14"
 
 [profile.dev]
-lto = "thin"
+#lto = "thin"	# disabled for now, adds 2-4 min to each CI build
+lto = "off"
 
 [profile.release]
 lto = true