From 705e5d6c26ba587b3cd127446264e498f66d087b Mon Sep 17 00:00:00 2001
From: Aron Heinecke <aron.heinecke@t-online.de>
Date: Fri, 13 Aug 2021 15:40:10 +0200
Subject: [PATCH] optimize release binary

---
 .cargo/config.toml | 2 ++
 Cargo.toml         | 3 +++
 README.md          | 4 ++++
 3 files changed, 9 insertions(+)
 create mode 100644 .cargo/config.toml

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..d5135e9
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,2 @@
+[build]
+rustflags = ["-C", "target-cpu=native"]
\ No newline at end of file
diff --git a/Cargo.toml b/Cargo.toml
index 7808752..a9eb76e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,9 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[profile.release]
+lto = true
+
 [dependencies]
 toml = "0.5"
 serde = { version = "1.0", features = ["derive"] }
diff --git a/README.md b/README.md
index 659711c..ecefb0f 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,10 @@ Then run `cargo build --release`
 .exe/elf is inside target/release/
 You can also run `cargo run --release` instead to directly build & execute the resulting binary.
 
+### Build optimization
+
+The default release build is heavily optimized, using native target-cpu instructions and LTO. You can disable LTO in the Cargo.toml under `[profile.release]`, which can reduce the build time by a lot. And you can disable the target-cpu flags in `.cargo/config.toml`.
+
 ## Starting
 Setup your credentials inside .credentials.toml by copying credentials.example.toml